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<div align="center"><span class="p"><b><font color="#FF3333" class="p11">第十一课
crack常见技巧</font></b></span></div>
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<div align="left"><span class="p9"><span class="p9">1、<span class="p9"><a href="lesson1401.htm" tppabs="http://toye.dihou.org/lesson1401.htm"><span class="p9"><span class="p9">一些常用方法</span></span></a></span></span></span></div>
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<div align="left"><span class="p9"><span class="p9">5、<a href="lesson1406.htm" tppabs="http://toye.dihou.org/lesson1406.htm">Key
File保护</a></span></span></div>
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<div align="left"><span class="p9"><span class="p9">2、<span class="p9"><span class="p9"><a href="lesson1402.htm" tppabs="http://toye.dihou.org/lesson1402.htm">序列号方式</a></span></span></span></span></div>
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<td width="50%" valign="top" class="p9" height="20"><span class="p9"><span class="p9">6、<span class="p9"><span class="p9"><a href="lesson1407.htm" tppabs="http://toye.dihou.org/lesson1407.htm">功能限制的程序</a></span></span> </span></span></td>
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<div align="left"><span class="p9"><span class="p9">3、<a href="lesson1403.htm" tppabs="http://toye.dihou.org/lesson1403.htm">NAG方式（警告窗口）</a></span></span></div>
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<td width="50%" valign="top" class="p9" height="20"><span class="p9"><span class="p9">7、<span class="p9"><a href="lesson1408.htm" tppabs="http://toye.dihou.org/lesson1408.htm">InstallSHIELD
Setups </a></span></span></span></td>
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<div align="left"><span class="p9"><span class="p9">4、<font color="#FF3333">运行时间限制</font></span></span></div>
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<td width="50%" valign="top" class="p9" height="20">8、<a href="lesson1410.htm" tppabs="http://toye.dihou.org/lesson1410.htm">CD-check</a></td>
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<p align="center" class="p9"><span class="p9"><span class="p9">4、<a href="lesson1404.htm" tppabs="http://toye.dihou.org/lesson1404.htm">运行时间限制</a></span></span>
<font color="#FF3366">【习题】 </font></p>
<p align="left" class="p9"><b><span class="p9">1、习题一</span></b><span class="p9">
<a href="javascript:if(confirm('http://toye.dihou.org/lesson1404-ex-01%20.zip \n\n这个文件不能通过 Teleport Pro 取回, 因为 没有遇到方案的文件类型说明. \n\n你想从服务器打开它吗?'))window.location='http://toye.dihou.org/lesson1404-ex-01%20.zip'" tppabs="http://toye.dihou.org/lesson1404-ex-01%20.zip">lesson1404-ex-01 </a>153K 每次20秒使用时间 易</span></p>
<p align="left" class="p9"><b><span class="p9">2、习题二</span></b><span class="p9">
<a href="javascript:if(confirm('http://toye.dihou.org/lesson1404-ex-02.zip \n\n这个文件不能通过 Teleport Pro 取回, 因为 没有遇到方案的文件类型说明. \n\n你想从服务器打开它吗?'))window.location='http://toye.dihou.org/lesson1404-ex-02.zip'" tppabs="http://toye.dihou.org/lesson1404-ex-02.zip">lesson1404-ex-02</a> 15K 时间限制 ( 需<a href="javascript:if(confirm('http://toye.dihou.org/cw3220.zip \n\n这个文件不能通过 Teleport Pro 取回, 因为 没有遇到方案的文件类型说明. \n\n你想从服务器打开它吗?'))window.location='http://toye.dihou.org/cw3220.zip'" tppabs="http://toye.dihou.org/cw3220.zip">cw3220.dll</a>
) 易</span></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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<tr bgcolor="#EFEFEF">
<td height="7" class="p9">这程序用上了SetTimer函数，设置断点：bpx setimer,将中断如下： <br>
:0043D3DF 66837B2E00 CMP WORD PTR [EBX+2E],00
<br>
:0043D3E4 7433 JZ
0043D419 <br>
:0043D3E6 6A00 PUSH
00
;处理定时过程的程序入口地址<br>
:0043D3E8 56 PUSH
ESI
;暂停时间值 (21 seconds) <br>
:0043D3E9 6A01 PUSH
01
; 定时器ID 标识符<br>
:0043D3EB 8B4328 MOV EAX,[EBX+28]
<br>
:0043D3EE 50 PUSH
EAX
; 句柄 <br>
:0043D3EF E8648FFCFF CALL USER32!SetTimer
<br>
:0043D3F4 85C0 TEST
EAX,EAX ; 时间是否到期? <br>
:0043D3F6 7521 JNZ
0043D419 ; 没到JMP <br>
... ... <br>
:0043D419 33C0 XOR
EAX,EAX <br>
<br>
现在我们可修改:0043D3E4 一行，让其直接跳过SetTimer函数，这样就没时间限制了。 <br>
将： JZ 0043D419改成JMP 0043D419 <br>
66837B2E007433改成66837B2E00EB33即可。
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2、习题二 答案</a></span></div>
<div id="KB2Child" class="child"> <span class="p9"> </span>
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<td height="7" class="p9">这是个时间限制程序。 <br>
一运行程序，我注意到跳出一对话框，说：trial-period has ended，这对话是调用messagebox函数的，今天我们不用此函数设断，这程序肯定调用了取系统时间函数，这样才能判断当前时间是否过期。因此用GetLocalTime函数设断。
<br>
bpx GetLocalTime <br>
中断如下： <br>
<br>
* Reference To: cw3220._getdate, Ord:0000h <br>
| <br>
:0040108A E83F040000 Call
004014CE ->GetLocalTime函数 <br>
:0040108F 59
pop ecx <br>
:00401090 817DF8CD070000 cmp dword ptr
[ebp-08], 000007CD <br>
//这一行觉得熟吧，7CD的十进制是1997,而当前时间在EAX里，是07D0 <br>
// <br>
:00401097 7F0F
jg 004010A8 ->如当前日期大于1997则出错。 <br>
<br>
剩下的工作太简单了，结束。
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<td width="82%" class="p8" height="34">Copyright @看雪 2000 All rights reserved
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