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<p><a href="../catalog.htm">目录</a>＞＞第6章</p>
<p align="center" class="shadow1Copy"><b class="p3">第6章 软件保护技术</b></p>
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<td class="shadow1" width="25%">
<div align="center">常见保护技巧</div>
</td>
<td class="shadow1" width="22%">
<div align="center">反跟踪技术</div>
</td>
<td class="shadow1" width="23%">
<div align="center">加密算法</div>
</td>
<td class="shadow1" width="30%">
<div align="center">软件保护建议</div>
</td>
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<p align="center"><span class="p9"><b>第一节 常见保护技巧</b></span></p>
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<td width="33%" valign="middle" align="center" class="p9" height="23">
<div align="center" class="p"><span class="p9"><span class="p9">1、<a href="Chap6-1-1.htm">序列号方式</a> </span></span></div>
</td>
<td width="33%" valign="middle" align="center" class="p9" height="23">
<div align="center">2、<a href="Chap6-1-2.htm">警告（NAG）窗口</a></div>
</td>
<td width="34%" valign="top" class="p9" height="23">
<div align="center"><span class="p9">3、<a href="Chap6-1-3.htm">时间限制</a></span></div>
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<td width="33%" valign="middle" align="center" class="p9" height="23">
<div align="center">4、<a href="Chap6-1-4.htm">Key File保护</a></div>
</td>
<td width="33%" valign="middle" align="center" class="p9" height="23">
<div align="center">5、<a href="Chap6-1-5.htm">功能限制的程序</a> </div>
</td>
<td width="34%" valign="top" class="p9" height="23">
<div align="center">6、<a href="Chap6-1-6.htm">CD-check</a></div>
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<p align="center"><span class="p9"><span class="p9"><b>5、<a href="Chap6-1-5.htm">功能限制的程序</a>
</b> <font color="#FF3333">【习题】 </font></span></span></p>
<p align="left" class="p9"><b>1、习题一</b> <a href="Exercise/section05/chap6-1-5-01.zip">chap6-1-5-01</a>
菜单选项呈灰色 大小：163K 易</p>
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<div id="KB1Parent" class="parent"> <span class="p9"><a href="#" onClick="expandIt('KB1'); return false">
1、习题一 答案</a> </span></div>
<div id="KB1Child" class="child"> <span class="p9"> </span>
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<p class="p9">这个程序是利用函数EnableMenuItem来使菜单变灰的，用W32DASM打开程序，查找EnableMenuItem，你会发现这部分是重点：
<br>
| <br>
:004329E4 8B7E58
mov edi, dword ptr [esi+58] <br>
:004329E7 85FF
test edi, edi <br>
:004329E9 7427
je 00432A12<---如是零则跳过 EnableMenuItem <br>
:004329EB F6462002
test [esi+20], 02 <br>
:004329EF 7521
jne 00432A12 <br>
:004329F1 33C0
xor eax, eax <br>
:004329F3 8AC3
mov al, bl <br>
:004329F5 8B0485D4374400 mov eax,
dword ptr [4*eax+004437D4] <br>
:004329FC 83C800
or eax, 00000000 <br>
:004329FF 50
push eax <br>
:00432A00 0FB74644
movzx eax, word ptr [esi+44] <br>
:00432A04 50
push eax <br>
:00432A05 8BC7
mov eax, edi <br>
:00432A07 E824F4FFFF
call 00431E30 <br>
:00432A0C 50
push eax <br>
<br>
* Reference To: user32.EnableMenuItem, Ord:0000h <br>
| <br>
:00432A0D E89A36FDFF
Call 004060AC <br>
<br>
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
<br>
|:004329E9(C), :004329EF(C) <br>
| <br>
:00432A12 33D2
xor edx, edx <br>
:00432A14 8BC6
mov eax, esi <br>
:00432A16 8B08
mov ecx, dword ptr [eax] <br>
:00432A18 FF5134
call [ecx+34] <br>
<br>
<br>
这有很多办法可使其跳转，但在这里选用另一法，你在SOFTICE下跟踪会发现在:004329E7 一行，EBX是0,因此将： <br>
004329E7 85FF test edi, edi <br>
改成： test
ebx, edi <br>
菜单功能恢复正常。
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