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標(biāo)題:
在 Visual C++ 中使用內(nèi)聯(lián)匯編
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作者:
hbhdgpyz
時間:
2008-9-28 16:24
標(biāo)題:
在 Visual C++ 中使用內(nèi)聯(lián)匯編
<SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">一、內(nèi)聯(lián)匯編的優(yōu)缺點</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 因為在Visual C++中使用內(nèi)聯(lián)匯編不需要額外的編譯器和聯(lián)接器,且可以處理Visual C++中不能處理的一些事情,而且可以使用在C/C++中的變量,所以非常方便。內(nèi)聯(lián)匯編主要用于如下場合: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 1.使用匯編語言寫函數(shù);<BR> 2.對速度要求非常高的代碼;<BR> 3.設(shè)備驅(qū)動程序中直接訪問硬件;<BR> 4."Naked" Call的初始化和結(jié)束代碼。<BR> //(."Naked",理解了意思,但是不知道怎么翻譯^_^,大概就是不需要C/C++的編譯器(自作聰明)生成的函數(shù)初始化和收尾代碼,請參看MSDN的"Naked <I>function</I>s"的說明)<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 內(nèi)聯(lián)匯編代碼不易于移植,如果你的程序打算在不同類型的機器(比如x86和Alpha)上運行,應(yīng)當(dāng)盡量避免使用內(nèi)聯(lián)匯編。這時候你可以使用MASM,因為MASM支持更方便的的宏指令和數(shù)據(jù)指示符。<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">二、內(nèi)聯(lián)匯編關(guān)鍵字</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 在Visual C++使用內(nèi)聯(lián)匯編用到的是__asm關(guān)鍵字,這個關(guān)鍵字有兩種使用方法: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 1.簡單__asm塊 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 2 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0xD007 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OUT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> }<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 2.在每條匯編指令之前加__asm關(guān)鍵字 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 2 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0xD007 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OUT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 因為__asm關(guān)鍵字是語句分隔符,因此你可以把匯編指令放在同一行: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 2 __asm </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0XD007 __asm </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OUT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 顯然,第一種方法和C/C++的風(fēng)格很一致,并且有很多其它優(yōu)點,因此推薦使用第一種方法。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 不象在C/C++中的"{}",__asm塊的"{}"不會影響C/C++變量的作用范圍。同時,__asm塊可以嵌套,嵌套也不會影響變量的作用范圍。<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">三、在<SPAN lang=EN-US>__asm塊中使用匯編語言</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 1.內(nèi)聯(lián)匯編指令集 <BR> 內(nèi)聯(lián)匯編完全支持的Intel 486指令集,允許使用MMX指令。不支持的指令可以使用_EMIT偽指令定義(_EMIT偽指令說明見下文)。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 2.MASM表達式 <BR> 內(nèi)聯(lián)匯編可以使用MASM中的表達式。比如: MOV EAX, 1。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 3.數(shù)據(jù)指示符和操作符 <BR> 雖然__asm塊中允許使用C/C++的數(shù)據(jù)類型和對象,但它不能用MASM指示符和操作符定義數(shù)據(jù)對象。這里特別指出,__asm塊中不允許MASM中的定義指示符: DB、DW、DD、DQ、DT和DF,也不允許DUP和THIS操作符。MASM結(jié)構(gòu)和記錄也不再有效,內(nèi)聯(lián)匯編不接受STRUC、RECORD、WIDTH或者MASK。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 4.EVEN和ALIGN指示符 <BR> 盡管內(nèi)聯(lián)匯編不支持大多數(shù)MASM指示符,但它支持EVEN和ALIGN,當(dāng)需要的時候,這些指示符在匯編代碼里面加入NOP(空操作)指令使標(biāo)號對齊到特定邊界。這樣可以使某些處理器取指令時具有更高的效率。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 5.MASM宏指示符 <BR> 內(nèi)聯(lián)匯編不是宏匯編,不能使用MASM宏指示符(MACRO、REPT、IRC、IRP和ENDM)和宏操作符(<>、!、&、%和.TYPE)。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 6.段說明 <BR> 必須使用寄存器來說明段,跨越段必須顯式地說明,如ES:[BX]。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 7.類型和變量大小 <BR> 我們可以使用LENGTH來取得C/C++中的數(shù)組中的元素個數(shù),如果不是一個數(shù)組,則結(jié)果為一。使用SIZE來取得C/C++中變量的大小,一個變量的大小是LENGTH和TYPE的乘積。TYPE用來取得一個變量的大小,如果是一個數(shù)組,它得到的一個數(shù)組中的單個元素的大小。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 8.注釋 <BR> 可以使用C/C++的注釋,但推薦用ASM的注釋,即";"號。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 9._EMIT偽指令 <BR> _EMIT偽指令相當(dāng)于MASM中的DB,但一次只能定義一個字節(jié),比如: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _CodeOfAsm <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _EMIT 0x00 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 定義混合在代碼段的數(shù)據(jù) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> _EMIT 0x01 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _CodeOfAsm: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 這里是代碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> _EMIT 0x90 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; NOP指令 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> }<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">四、在<SPAN lang=EN-US>__asm塊中使用C/C++語言元素</SPAN></SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> C/C++與匯編可以混合使用,在內(nèi)聯(lián)匯編可以使用C/C++的變量和很多其它C/C++的元素。在__asm塊中可以使用以下C/C++元素: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 1.符號,包括標(biāo)號、變量和函數(shù)名; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 2.常量,包括符號常量和枚舉型(enum)成員; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 3.宏定義和預(yù)處理指示符; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 4.注釋,包括"/**/"和"//"; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 5.類型名,包括所有MASM中合法的類型 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 6.typedef名稱, 像PTR、TYPE、特定的結(jié)構(gòu)成員或枚舉成員這樣的通用操作符。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 在__asm塊中,可以使用C/C++或ASM的基數(shù)計數(shù)法(比如: 0x100和100H是相等的)。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> __asm塊中不能使用像<<一類的C/C++操作符。C/C++和MASM通用的操作符,比如"*"和"[]"操作符,都被認(rèn)為是匯編語言的操作符。舉個例子: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[10]]; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[6]], </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">BX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> ; Store </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">BX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> at array+6 (</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">not</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> scaled) <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[6]] = 0; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* Store 0 at array+12 (scaled) */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> * 小技巧: 內(nèi)聯(lián)匯編中,你可以使用TYPE操作符使作其與C一致。比如,下面兩條語句是一樣的: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[6 * TYPE </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> ], 0 ; Store 0 at array + 12 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> array[[6]] = 0; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* Store 0 at array + 12 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 內(nèi)聯(lián)匯編能通過變兩名直接引用C/C++的變量。__asm塊中可以引用任何符號,包括變量名。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 如果C/C++中的類、結(jié)構(gòu)或者枚舉成員具有唯一的名稱,如果在"."操作符之前不指定變量或者typedef名稱,則__asm塊中只能引用成員名稱。然而,如果成員不是唯一的,你必須在"."操作符之前加上變量名或typedef名稱。例如,下面的兩個結(jié)構(gòu)都具有same_name這個成員變量: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> first_type <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> *weasel; <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> same_name; <BR> }; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> second_type <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> wonton; <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">long</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> same_name; <BR> }; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 如果按下面聲明變量: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> first_type hal; <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">struct</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> second_type oat; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 那么,所有引用same_name成員的地方都必須使用變量名,因為same_name不是唯一的。另外,上面的weasel變量具有唯一的名稱,你可以僅僅使用它的成員名稱來引用它: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET hal <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">]hal.same_name </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 必須使用 'hal'</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ESI</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">].weasel </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 可以省略 'hal'</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> } <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 注意,省略了變量名僅僅是為了寫代碼的方便,生成的匯編指令的還是一樣的。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 可以不受限制地訪問C++成員變量,但是不能調(diào)用C++的成員函數(shù)。<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">五、寄存器使用</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 一般來說,在__asm塊開始的時候,寄存器是空的,不能在兩個__asm之間保存寄存器的值。(這是MSDN上說的,我在實際使用時發(fā)現(xiàn),好像并不是這樣。不過它是說"一般",我是特殊:)) <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 如果一個函數(shù)被聲明成了__fastcall,則其參數(shù)將放在寄存器中,這將給寄存器的管理帶來問題。所以,如果要將一個函數(shù)聲明成__fastcall,必須保存ECX寄存器。為了避免以上的沖突,在聲明為__fastcall的函數(shù)中不要有__asm塊。如果用了/Gr編譯選項(它全局的變成__fastcall),將每個函數(shù)聲明成__cdecl或者__stdcall,這個屬性告訴編譯器用傳統(tǒng)的C方法。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 如果使用EAX、EBX、ECX、EDX、ESI和EDI寄存器,你不需要保存它;但如果你用到了DS、 SS、SP、BP和標(biāo)志寄存器,那就應(yīng)該PUSH保存這些寄存器。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 如果程序中改變了用于STD和CLD的方向標(biāo)志,你必須將其恢復(fù)到原來的值。<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">六、轉(zhuǎn)跳</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 可以在C里面使用goto調(diào)到__asm塊中的標(biāo)號處,也可以在__asm塊中轉(zhuǎn)跳到__asm塊里面和外面的標(biāo)號處。__asm塊內(nèi)的標(biāo)號是不區(qū)分大小寫的(指令、指示符等也是不區(qū)分大小寫的)。例: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">void</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> func() <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> C_Dest; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 合法 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> c_dest; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 錯誤 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> A_Dest; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 合法 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">goto</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> a_dest; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* 合法 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> C_Dest </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> c_dest </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; MSDN上說合法,但是我在VS.NET中編譯,認(rèn)為這樣不合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> A_Dest </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> a_dest </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 合法</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> a_dest: ; </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 標(biāo)號 <BR> } <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> C_Dest: </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">/* C的標(biāo)號 */</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR> } <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> 不要使用函數(shù)名稱當(dāng)作標(biāo)號,否則將使其跳到函數(shù)執(zhí)行而不是標(biāo)號處。如下所示: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 錯誤: 使用函數(shù)名作為標(biāo)號 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNE</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> exit <BR> . <BR> . <BR> . <BR> exit: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 下面是更多的ASM代碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> 美元符號$用于指定當(dāng)前位置,如下所用,常用于條件跳轉(zhuǎn): <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNE</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> $+5 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 下面這條指令的長度是5個字節(jié) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JMP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> farlabel <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">;$+5,跳到了這里 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> . <BR> . <BR> . <BR> farlabel: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">七、調(diào)用函數(shù)</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 內(nèi)聯(lián)匯編調(diào)用C/C++函數(shù)必須自己清除堆棧,下面是一個調(diào)用C/C++函數(shù)例子: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: red">#include</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <stdio.h> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szformat[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"%s %s\n"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szHello[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"Hello"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szWorld[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">" world"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">void</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> main() <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET szWorld <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET szHello <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, OFFSET szformat <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> printf <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//內(nèi)聯(lián)匯編調(diào)用C函數(shù)必須自己清除堆棧 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//用不使用的EBX寄存器清除堆棧,或ADD ESP, 12 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> } <BR> } <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 注意:函數(shù)參數(shù)是從右向左壓棧。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 不能夠訪問C++中的類成員函數(shù),但是可以訪問extern "C"函數(shù)。 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 如果調(diào)用Windows API函數(shù),則不需要自己清除堆棧,因為API的返回指令是RET n,會自動清除堆棧 <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 比如下面的例子: <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: red">#include</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <windows.h> <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szAppName[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"API Test"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">void</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> main() <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">char</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> szHello[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"Hello, world!"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> MB_OK </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> MB_ICONINformATION <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> OFFSET szAppName </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 全局變量用OFFSET</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LEA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, szHello </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 局部變量用LEA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 0 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> DWORD PTR [MessageBoxA] </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">; 注意這里,我費了好大周折才發(fā)現(xiàn)不是CALL MessageBoxA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> } <BR> } <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 一般來說,在Visual C++中使用內(nèi)聯(lián)匯編是為了提高速度,因此這些函數(shù)調(diào)用盡可能用C/C++寫。<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN><SPAN style="FONT-SIZE: 9pt; COLOR: darkorange">八、一個例子</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> 下面的例子是在VS.NET(即VC7)中C語言寫的。先建一個工程,將下列代碼放到工程中的.c文件中編譯,無需作特別的設(shè)置,即可編譯通過。<o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//預(yù)處理 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: red">#include</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <Windows.h> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//全局變量 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> HWND g_hWnd; <BR> HINSTANCE g_hInst; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> TCHAR szTemp[1024]; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> TCHAR szAppName[] = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"CRC32 Sample"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//函數(shù)聲明 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> DWORD GetCRC32(const BYTE *pbData, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> nSize); <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> iCmdShow); <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LRESULT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALLBACK</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam); <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//主函數(shù) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> iCmdShow) <BR> { <BR> MSG msg; <BR> WNDCLASSEX wndClassEx; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> g_hInst = hInstance; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> wndClassEx.cbSize = </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">sizeof</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">(WNDCLASSEX); <BR> wndClassEx.style = CS_VREDRAW | CS_HREDRAW; <BR> wndClassEx.lpfnWndProc = (WNDPROC) WindowProc; <BR> wndClassEx.cbClsExtra = 0; <BR> wndClassEx.cbWndExtra = 0; <BR> wndClassEx.hInstance = g_hInst; <BR> wndClassEx.hIcon = LoadIcon(NULL, IDI_APPLICATION); <BR> wndClassEx.hCursor = LoadCursor(NULL, IDC_ARROW); <BR> wndClassEx.hbrBackground = (HBRUSH) (COLOR_WINDOW); <BR> wndClassEx.lpszMenuName = NULL; <BR> wndClassEx.lpszClassName = szAppName; <BR> wndClassEx.hIconSm = NULL; <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> RegisterClassEx(&wndClassEx); <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> g_hWnd = CreateWindowEx(0, szAppName, szAppName, WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_THICK<I>FRame</I> | WS_MINIMIZEBOX, <BR> CW_USEDEFAULT, CW_USEDEFAULT, 300, 70, <BR> NULL, NULL, g_hInst, NULL); <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> ShowWindow(g_hWnd, iCmdShow); <BR> UpdateWindow(g_hWnd); <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">while</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (GetMessage(&msg, NULL, 0, 0)) <BR> { <BR> TranslateMessage(&msg); <BR> DispatchMessage(&msg); <BR> } <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> ((</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">) msg.wParam); <BR> } <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//主窗口回調(diào)函數(shù) </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LRESULT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">CALLBACK</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">switch</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (uMsg) <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WM_CREATE: <BR> CreateWindowEx(WS_EX_CLIENTEDGE, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"EDIT"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | ES_AUTOHSCROLL | ES_AUTOVSCROLL | ES_NOHIDESEL | WS_OVERLAPPED, <BR> 7, 12, 220, 22, <BR> hWnd, (HMENU)1000, g_hInst, NULL); <BR> CreateWindowEx(0, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"BUTTON"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"&OK"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | WS_OVERLAPPED | BS_FLAT, <BR> 244, 12, 40, 20, <BR> hWnd, (HMENU)IDOK, g_hInst, NULL); <o:p></o:p></SPAN></P>
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<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">break</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
4 @7 P3 j6 D: w0 w* A
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WM_COMMAND: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">switch</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (LOWORD(wParam)) <BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> IDOK: <BR> GetDlgItemText(g_hWnd, 1000, szTemp + 100, 800); <BR> wsprintf(szTemp, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: fuchsia">"當(dāng)前文本框內(nèi)的字符串的CRC32校驗碼是: 0x%lX"</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, GetCRC32(szTemp + 100, (</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">)strlen(szTemp + 100))); <BR> MessageBox(g_hWnd, szTemp, szAppName, MB_OK|MB_ICONINformATION); <BR> } <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">break</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
- i: \. C* ~! k2 Y6 T
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">case</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> WM_DESTROY: <BR> PostQuitMessage(0); <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">break</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">; <o:p></o:p></SPAN></P>
p7 |1 R1 j9 k* t: b5 P
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">default</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (DefWindowProc(hWnd, uMsg, wParam, lParam)); <BR> } <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">return</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> (0); <BR> } <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
, p% v# F: t5 k {, @- R/ a. l
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//////////////////////////////////////////////////////////////////////////////////////////////////// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//GetCRC32: 求字節(jié)流的CRC32校驗碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//參數(shù): </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// pbData: 指向字節(jié)流緩沖區(qū)首地址 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// nSize: 字節(jié)流長度 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//返回值: </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// 字節(jié)流的CRC32校驗碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//這里使用查表法求CRC32校驗碼,這部分是參考老羅的文章《 矛與盾的較量(2)——CRC原理篇》該寫的。 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//原文的具體內(nèi)容請參看: <A href="http://www.luocong.com/articles/show_article.asp?Article_ID=15" target=_blank>http://www.luocong.com/articles/show_article.asp?Article_ID=15</A> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//下面使用內(nèi)聯(lián)匯編求CRC32校驗碼,充分使用了CPU中的寄存器,速度和方便性都是使用C/C++所不能比擬的 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">// </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> DWORD GetCRC32(const BYTE *pbData, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">int</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> nSize) <BR> { <BR> DWORD dwCRC32Table[256]; <o:p></o:p></SPAN></P>
9 ?( f( I' j+ |( |' U! e/ {2 i
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//這片內(nèi)聯(lián)匯編是初始化CRC32表 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 256 <o:p></o:p></SPAN></P>
% G% x% Z' k- }$ g; ~
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _NextTable: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LEA</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">-1] <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">PUSH</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 8 <o:p></o:p></SPAN></P>
+ k+ r1 }- q2 `; |5 s
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _NextBit: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">SHR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 1 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _NotCarry <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">XOR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 0xEDB88320 <BR> _NotCarry: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">DEC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _NextBit <o:p></o:p></SPAN></P>
- B: E& q; r! a$ Z5 V! s: K
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">POP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> [dwCRC32Table + </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">*4 - 4], </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">DEC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JNZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _NextTable <BR> } <o:p></o:p></SPAN></P>
: Z9 G$ e1 V* h" m8 B
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">__asm</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">//下面是求CRC32校驗碼 </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR> { <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, -1 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, pbData <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _Done <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, nSize <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">OR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">ECX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">JZ</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _Done <o:p></o:p></SPAN></P>
\* a3 v5 t5 }8 U; f6 } H3 }
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _NextByte: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOV</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">] <o:p></o:p></SPAN></P>
6 ?0 X* r! h+ X
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">XOR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">AL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">MOVZX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EDX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">DL</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">SHR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, 8 <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">XOR</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">, [dwCRC32Table + </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EDX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black">*4] <o:p></o:p></SPAN></P>
9 O) Z) p- U Y% z
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">INC</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EBX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">LOOP</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> _NextByte <BR> _Done: <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: blue">NOT</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: olive">EAX</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"> <BR> } <BR> } <BR> </SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: green">////////////////////////////////////////////////////////////////////////////////////////////////////</SPAN><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><o:p></o:p></SPAN></P>
/ l- l5 o& S7 Z7 t4 o3 i
<P style="WORD-BREAK: break-all; LINE-HEIGHT: 12pt"><SPAN lang=EN-US style="FONT-SIZE: 9pt; COLOR: black"><BR></SPAN></P>
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