📄 csdn_文档中心_屏幕取词核心内幕.htm
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<P class=MsoNormal
style="MARGIN-LEFT: 35.4pt; TEXT-INDENT: -21.25pt; mso-list: l26 level1 lfo26; tab-stops: list 35.4pt"><SPAN
style="FONT: 7pt 'Times New Roman'"><SPAN lang=EN-US
style="FONT-FAMILY: Symbol"></SPAN></SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码与</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码的数据交换</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 35.4pt; TEXT-INDENT: -21.25pt; mso-list: l26 level1 lfo26; tab-stops: list 35.4pt"><SPAN
style="FONT: 7pt 'Times New Roman'"><SPAN lang=EN-US
style="FONT-FAMILY: Symbol"> </SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">动态修改</SPAN><SPAN
lang=EN-US>Windows</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">内核</SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US> </SPAN><SPAN lang=EN-US
style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 黑体">1．<SPAN
style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 黑体">32bit</SPAN><SPAN
style="FONT-FAMILY: 黑体; FONT-SIZE: 12pt; mso-ascii-font-family: Arial; mso-bidi-font-size: 10.0pt">到</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 黑体">16bit</SPAN><SPAN
style="FONT-FAMILY: 黑体; FONT-SIZE: 12pt; mso-ascii-font-family: Arial; mso-bidi-font-size: 10.0pt">的形式替换（</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 黑体">Thunk</SPAN><SPAN
style="FONT-FAMILY: 黑体; FONT-SIZE: 12pt; mso-ascii-font-family: Arial; mso-bidi-font-size: 10.0pt">）</SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">形式替换是指那些允许从</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码调用</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码或从</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码调用</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码的技术。形式替换用于解决试图在同一操作系统或同一可执行程序上使</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码与</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码同时并存的问题，即</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码与</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码的混合编程技术。早期的</SPAN><SPAN
lang=EN-US>DOS</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">程序及</SPAN><SPAN
lang=EN-US>Window3.x</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">上的应用程序均为</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位程序，</SPAN><SPAN
lang=EN-US>Windows95</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">及</SPAN><SPAN
lang=EN-US>Windows NT</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">虽然也可运行旧的</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位程序，但它们的主流发展方向是</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位应用程序。与</SPAN><SPAN
lang=EN-US>Windows NT</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">不同的是，</SPAN><SPAN
lang=EN-US>Windows95</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">不是一个“纯”</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位操作系统，为了兼有令人满意的速度和与旧的</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位程序的良好兼容性，其内核本身就是一个</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位与</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位的混合体，因此也为编程者使用形式替换提供了便利。</SPAN><SPAN
lang=EN-US>Microsoft</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">为编写形式替换程序提供了通用的接口及工具，但因</SPAN><SPAN
lang=EN-US>LTW32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">中的形式替换并不复杂，所以使用了一些编程技巧，而避免了使用</SPAN><SPAN
lang=EN-US>Microsoft</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">复杂的开发工具。</SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">形式替换中最主要的问题有两点：①</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位与</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位数据类型尺寸的变化，如</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码到</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码的一个重要变化是整型数</SPAN><SPAN
lang=EN-US>int</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">的长度加倍了</SPAN>
<SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">；②是堆栈操作时，</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位模式使用</SPAN><SPAN
lang=EN-US>SS:SP</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">堆栈指针控制栈顶，而在</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位模式中使用</SPAN><SPAN
lang=EN-US>ESP</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">寄存器作堆栈指针控制栈顶。</SPAN></P>
<P class=MsoNormal style="TEXT-INDENT: 18pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">在</SPAN><SPAN
lang=EN-US>LTW32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">中，屏幕抓词功能由</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位</SPAN><SPAN
lang=EN-US>DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">实现，因而只需实现</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位到</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位的形式替换，为</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码提供</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位</SPAN><SPAN
lang=EN-US>DLL</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">的调用接口。</SPAN><SPAN
lang=EN-US>CALL FWORD PTR</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">是</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位汇编代码的一种调用方法，它可让</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码调用到</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位代码。作为实现的关键，控制</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位侧与</SPAN><SPAN
lang=EN-US>32</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位侧各自的堆栈是编程的要点。</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><U><SPAN lang=EN-US
style="FONT-FAMILY: 黑体">32位侧的调用代码：</SPAN></U></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
lang=EN-US>_asm{</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>pusha</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>call fword ptr [func16bit]<SPAN style="mso-tab-count: 1">
</SPAN>/* func16bit</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">是</SPAN><SPAN
lang=EN-US>16</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位被调用者的</SPAN><SPAN
lang=EN-US>48</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: Arial">位地址</SPAN><SPAN
lang=EN-US> */</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>popa</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
lang=EN-US>}</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><U><SPAN lang=EN-US
style="FONT-FAMILY: 黑体">16位侧的调用代码：</SPAN></U></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US>int
dummy;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US>static
char stack[8192];<SPAN style="mso-tab-count: 2">
</SPAN></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt; mso-bidi-font-size: 10.0pt">/* 16</SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: Arial; mso-bidi-font-size: 10.0pt">位代码的临时堆栈</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 9pt; mso-bidi-font-size: 10.0pt">
*/</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US>static
WORD stack_seg;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US>static
WORD prev_seg;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US>static
DWORD prev_ofs;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US>static
WORD prev_ds;<SPAN style="mso-tab-count: 1"> </SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN
lang=EN-US>_asm{</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>push ax;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>push bx;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov ax, ds;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov bx, seg dummy;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov ds, bx;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov stack_seg, bx;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov prev_ds, ax;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>pop bx;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>pop ax;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov prev_seg, ss;</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov dword ptr prev_ofs, esp;<SPAN style="mso-tab-count: 1">
</SPAN></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 9pt; mso-bidi-font-size: 10.0pt">/* </SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: Arial; mso-bidi-font-size: 10.0pt">保存</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 9pt; mso-bidi-font-size: 10.0pt">32</SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt; mso-ascii-font-family: Arial; mso-bidi-font-size: 10.0pt">位堆栈指针</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 9pt; mso-bidi-font-size: 10.0pt">
*/</SPAN></P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 2">
</SPAN>mov ss, stack_seg;</SPAN></P>
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