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iPromise
Grandmaster Cheater
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Joined: 27 Jun 2009
Posts: 529
Location: Canada
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 Posted: Fri Apr 09, 2010 6:15 pm Post subject: SendMessage |
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My SendMessage hookhop won't work, do you see any errors in my code?
| Code: |
DWORD SendMessageAddress = (DWORD) GetProcAddress(GetModuleHandle(_T("user32.dll")), "SendMessage") + 5;
LRESULT SendMessageX(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
__asm
{
MOV EDI,EDI
PUSH EBP
MOV EBP,ESP
JMP [SendMessageAddress]
}
}
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| Quote: |
Unhandled exception at 0x00000005 in Run.exe: 0xC0000005: Access violation.
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Deine Mutter
Expert Cheater
 Reputation: 1
Joined: 05 Apr 2006
Posts: 181
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| Posted: Fri Apr 09, 2010 6:41 pm Post subject: |
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I think you have to get the address of "SendMessageA" or "SendMessageW" (A = ANSI, W = UNICODE), since a function named "SendMessage" is not exported by user32.dll, but im not really sure.
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iPromise
Grandmaster Cheater
![]() Reputation: -1
Joined: 27 Jun 2009
Posts: 529
Location: Canada
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| Posted: Fri Apr 09, 2010 6:49 pm Post subject: |
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@Deine Mutter
| Quote: |
Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.
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| Code: |
DWORD SendMessageAddress = (DWORD) GetProcAddress(GetModuleHandle(_T("user32.dll")), "SendMessageA") + 5;
LRESULT SendMessageX(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
__asm
{
mov edi,edi
push ebp
mov esp, ebp
jmp [SendMessageAddress]
}
}
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Deine Mutter
Expert Cheater
Reputation: 1
Joined: 05 Apr 2006
Posts: 181
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| Posted: Fri Apr 09, 2010 6:55 pm Post subject: |
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| Code: | __declspec(naked) LRESULT SendMessageX(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
__asm
{
mov edi,edi
push ebp
mov esp, ebp
jmp [SendMessageAddress]
}
} |
try this
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iPromise
Grandmaster Cheater
![]() Reputation: -1
Joined: 27 Jun 2009
Posts: 529
Location: Canada
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| Posted: Sat Apr 10, 2010 10:31 am Post subject: |
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My program encounters a breakpoint if I use that code, hmm, this is wierd. I looked in the user32 dll and I looked at the opcodes and it was right, I don't see what causing a problem.
| Code: |
DWORD SendMessageAddress = (DWORD) GetProcAddress(GetModuleHandleA("user32.dll"), "SendMessageA") + 5;
__declspec(naked) LRESULT WINAPI SendMessageX(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
__asm
{
mov edi,edi
push ebp
mov esp, ebp
jmp [SendMessageAddress]
}
}
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EDIT
| Code: |
DWORD SendMessageAddress = (DWORD) GetProcAddress(GetModuleHandleA("user32.dll"), "SendMessageA") + 5;
LRESULT WINAPI SendMessageX(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
__asm
{
mov edi,edi
push ebp
mov esp, ebp
jmp [SendMessageAddress]
}
}
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Slugsnack
Grandmaster Cheater Supreme
![]() Reputation: 71
Joined: 24 Jan 2007
Posts: 1857
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| Posted: Sat Apr 10, 2010 11:58 am Post subject: |
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| iPromise wrote: | | My program encounters a breakpoint if I use that code, hmm, this is wierd. I looked in the user32 dll and I looked at the opcodes and it was right, I don't see what causing a problem. |
the rest of your code that you didn't copy from somewhere : post it
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