请高手帮忙分析一下关键代码
点击导出QQ按钮，出错后，被 断下，来到这里：00454AA0 .83EC 64 sub esp, 64
00454AA3 .56 push esi
00454AA4 .8B7424 74 mov esi, dword ptr
00454AA8 .57 push edi
00454AA9 .8B7E 08 mov edi, dword ptr
00454AAC .57 push edi
00454AAD .E8 5E650100 call 0046B010
00454AB2 .83C4 04 add esp, 4
00454AB5 .85C0 test eax, eax
00454AB7 .74 10 je short 00454AC9
00454AB9 .8D4424 08 lea eax, dword ptr
00454ABD .50 push eax
00454ABE .56 push esi
00454ABF .E8 ACDEFFFF call 00452970
00454AC4 .83C4 08 add esp, 8
00454AC7 .EB 42 jmp short 00454B0B
00454AC9 >81FF 04000080 cmp edi, 80000004 ;Switch (cases 80000002..80000004)
00454ACF .75 04 jnz short 00454AD5
00454AD1 .8B0E mov ecx, dword ptr ;Case 80000004 (SINGLE STEP) of switch 00454AC9
00454AD3 .EB 3A jmp short 00454B0F
00454AD5 >81FF 02000080 cmp edi, 80000002
00454ADB .75 12 jnz short 00454AEF
00454ADD .8B16 mov edx, dword ptr ;Case 80000002 (DATATYPE MISALIGNMENT) of switch 00454AC9
00454ADF .8D4C24 08 lea ecx, dword ptr
00454AE3 .51 push ecx
00454AE4 .52 push edx
00454AE5 .E8 D6400200 call 00478BC0
00454AEA .83C4 08 add esp, 8
00454AED .EB 1C jmp short 00454B0B
00454AEF >81FF 03000080 cmp edi, 80000003
00454AF5 .75 1C jnz short 00454B13
00454AF7 .8B4E 04 mov ecx, dword ptr ;Case 80000003 (BREAKPOINT) of switch 00454AC9
00454AFA .8B16 mov edx, dword ptr
00454AFC .8D4424 08 lea eax, dword ptr
00454B00 .50 push eax
00454B01 .51 push ecx
00454B02 .52 push edx
00454B03 .E8 F8390200 call 00478500
00454B08 .83C4 0C add esp, 0C
00454B0B >8D4C24 08 lea ecx, dword ptr
00454B0F >85C9 test ecx, ecx
00454B11 .75 09 jnz short 00454B1C
00454B13 >C64424 08 00mov byte ptr , 0 ;Default case of switch 00454AC9
00454B18 .8D4C24 08 lea ecx, dword ptr
00454B1C >8B46 20 mov eax, dword ptr
00454B1F .BA F0727600 mov edx, 007672F0
00454B24 .85C0 test eax, eax
00454B26 .74 03 je short 00454B2B
00454B28 .8B56 18 mov edx, dword ptr
00454B2B >8B46 0C mov eax, dword ptr
00454B2E .8BF0 mov esi, eax
00454B30 .F7D6 not esi
00454B32 .81E6 00100000 and esi, 1000
00454B38 .8D0470 lea eax, dword ptr
00454B3B .50 push eax ; /Style
00454B3C .52 push edx ; |Title
00454B3D .51 push ecx ; |Text
00454B3E .6A 00 push 0 ; |hOwner = NULL
00454B40 .FF15 E8E64F00 call dword ptr [<&USER32.MessageBoxA>>; \MessageBoxA
00454B46 .5F pop edi
00454B47 .83F8 03 cmp eax, 3 ;Switch (cases 2..7)
00454B4A .5E pop esi
00454B4B .75 0F jnz short 00454B5C
00454B4D .8B4C24 68 mov ecx, dword ptr ;Case 3 of switch 00454B47
00454B51 .B8 02000000 mov eax, 2
00454B56 .8901 mov dword ptr , eax
00454B58 .83C4 64 add esp, 64
00454B5B .C3 retn
00454B5C >83F8 02 cmp eax, 2
00454B5F .75 0F jnz short 00454B70
00454B61 .8B5424 68 mov edx, dword ptr ;Case 2 of switch 00454B47
00454B65 .B8 01000000 mov eax, 1
00454B6A .8902 mov dword ptr , eax
00454B6C .83C4 64 add esp, 64
00454B6F .C3 retn
00454B70 >83F8 05 cmp eax, 5
00454B73 .75 0F jnz short 00454B84
00454B75 .8B4C24 68 mov ecx, dword ptr ;Case 5 of switch 00454B47
00454B79 .B8 04000000 mov eax, 4
00454B7E .8901 mov dword ptr , eax
00454B80 .83C4 64 add esp, 64
00454B83 .C3 retn
00454B84 >83F8 07 cmp eax, 7
00454B87 .75 0F jnz short 00454B98
00454B89 .8B5424 68 mov edx, dword ptr ;Case 7 of switch 00454B47
00454B8D .B8 06000000 mov eax, 6
00454B92 .8902 mov dword ptr , eax
00454B94 .83C4 64 add esp, 64
00454B97 .C3 retn
00454B98 >83F8 06 cmp eax, 6
00454B9B .75 0F jnz short 00454BAC
00454B9D .8B4C24 68 mov ecx, dword ptr ;Case 6 of switch 00454B47
00454BA1 .B8 05000000 mov eax, 5
00454BA6 .8901 mov dword ptr , eax
00454BA8 .83C4 64 add esp, 64
00454BAB .C3 retn
00454BAC >33D2 xor edx, edx ;Default case of switch 00454B47
00454BAE .8B4C24 68 mov ecx, dword ptr
00454BB2 .83F8 04 cmp eax, 4
00454BB5 .0F95C2 setne dl
00454BB8 .4A dec edx
00454BB9 .83E2 03 and edx, 3
00454BBC .8BC2 mov eax, edx
00454BBE .8901 mov dword ptr , eax
00454BC0 .83C4 64 add esp, 64
00454BC3 .C3 retn
但一直找不出关键代码，还请高手指点，谢谢！
软件放出来看看 学习中，谢谢分享。]
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