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decheatengine
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Joined: 10 Jun 2007
Posts: 25
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 Posted: Tue Mar 18, 2008 10:04 pm Post subject: How to call a function inside a injected DLL? |
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How to call a function inside a injected DLL from a GUI? I tried the below code but it didnt work.
| Code: |
//inject the dll to the process
HMODULE dll = InjectDll("notepad.exe", "Trainer.dll");
//blah blah blah
//blah blah blah
//blah blah blah
//here try to invoke a functionn from GUI
HMODULE hDummy = LoadLibrary("Trainer.dll");
PVOID func = GetProcAddress(hDummy, "_Hello");
DWORD offset = (DWORD)func - (DWORD)hDummy;
DWORD realfunc = (DWORD)dll + offset;
HANDLE hThread = CreateRemoteThread(0, 0, 0, (LPTHREAD_START_ROUTINE)realfunc, 0, 0,0);
DWORD error = GetLastError();
if (hThread != 0)
{
WaitForSingleObject(hThread, INFINITE);
CloseHandle(hThread);
FreeLibrary(hDummy);
}
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The value in realfunc is correct after i checked it using moon LightEngine's "Enumerate DLL and Symbols". But CreateRemoteThread returned NULL and error = 6.
Help please. |
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Dark Byte
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Joined: 09 May 2003
Posts: 25785
Location: The netherlands
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| Posted: Tue Mar 18, 2008 10:58 pm Post subject: |
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CreateRemoteThread needs the processhandle of the process you've injected the dll in.
If you're doing the current process, use -1, not 0. Else Give it the processhandle.
Also, you could run the function from the dllmain
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decheatengine
Cheater
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Joined: 10 Jun 2007
Posts: 25
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| Posted: Sun Mar 23, 2008 6:23 am Post subject: |
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| DarkByte thanks for the answer. I'm now able to invoke a function in Notepad.exe but everytime the program crashes in FreeLibrary(hDummy). Shouldn't I need to free the library? |
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Dark Byte
Site Admin
Reputation: 470
Joined: 09 May 2003
Posts: 25785
Location: The netherlands
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| Posted: Sun Mar 23, 2008 6:33 am Post subject: |
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try FreeLibraryAndExitThread if you call the freelibrary from inside the dll
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