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没有什么特别有效的方法，靠的就是耐心和经验，反复验证，直到调用成功。
有个dll2lib的工具，不知道是我不会使用还是怎么的，反正我是没有使用成功过，所以我只能靠自己
来分析了。
首先是使用的工具，ida/win32dasm/ollydbg
win32dasm分析的速度快一些，但是智能程度不如ida,ida这个2001开发工具亚军绝对不是浪得虚名的
，它的智能程度非常高，可是识别出常用的函数，这两个都是静态反汇编的工具，必须配以动态分析的工具，
毕竟你很难一下子就分析对(至少我是这样)，当然你可以使用s-ice或者trw，但是这些工具都有限制，trw不支
持2000，s-ice一旦装载只能reboot才能取消装载，还有其工作在ring0，所以你只能对者黑乎乎的屏幕，很痛
苦，这里选用的ollydbg是最新版本，支持dll的跟踪。
下面列出win32dasm反汇编的结果：
Exported fn(): GetUserNumber - Ord:0004h
:0040C1B0 55 push ebp
:0040C1B1 8BEC mov ebp, esp
:0040C1B3 53 push ebx
:0040C1B4 56 push esi
:0040C1B5 57 push edi
:0040C1B6 8B5D08 mov ebx, dword ptr [ebp+08]
:0040C1B9 33F6 xor esi, esi
:0040C1BB 8BC3 mov eax, ebx
:0040C1BD E846A5FFFF call 00406708
:0040C1C2 6685C0 test ax, ax
:0040C1C5 7212 jb 0040C1D9
:0040C1C7 40 inc eax
:0040C1C8 33D2 xor edx, edx
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040C1D7(C)
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:0040C1CA 0FB7CA movzx ecx, dx
:0040C1CD 0FB60C0B movzx ecx, byte ptr [ebx+ecx]
:0040C1D1 03F1 add esi, ecx
:0040C1D3 42 inc edx
:0040C1D4 66FFC8 dec ax
:0040C1D7 75F1 jne 0040C1CA
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040C1C5(C)
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:0040C1D9 8B450C mov eax, dword ptr [ebp+0C]
:0040C1DC 8A4012 mov al, byte ptr [eax+12]
:0040C1DF 3C61 cmp al, 61
:0040C1E1 720B jb 0040C1EE
:0040C1E3 25FF000000 and eax, 000000FF
:0040C1E8 6683E861 sub ax, 0061
:0040C1EC EB09 jmp 0040C1F7
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040C1E1(C)
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:0040C1EE 25FF000000 and eax, 000000FF
:0040C1F3 6683E841 sub ax, 0041
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040C1EC(U)
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:0040C1F7 8B550C mov edx, dword ptr [ebp+0C]
:0040C1FA 8A5213 mov dl, byte ptr [edx+13]
:0040C1FD 80FA61 cmp dl, 61
:0040C200 720C jb 0040C20E
:0040C202 81E2FF000000 and edx, 000000FF
:0040C208 6683EA61 sub dx, 0061
:0040C20C EB0A jmp 0040C218
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040C200(C)
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:0040C20E 81E2FF000000 and edx, 000000FF
:0040C214 6683EA41 sub dx, 0041
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040C20C(U)
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:0040C218 0FB7C0 movzx eax, ax
:0040C21B 6BF81A imul edi, eax, 0000001A
:0040C21E 0FB7C2 movzx eax, dx
:0040C221 03F8 add edi, eax
:0040C223 81F74D010000 xor edi, 0000014D
:0040C229 83F701 xor edi, 00000001
:0040C22C 8BC3 mov eax, ebx
:0040C22E E8D5A4FFFF call 00406708
:0040C233 2BF8 ;nb
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