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POGetModuleHandle return INVALID_HANDLE_VALUE
 

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  1. POGetModuleHandle return INVALID_HANDLE_VALUE
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    <p>So I am learning some dll injection stuff on a test executable. Once I have injected my dll, I try to get the module handle and with that I try to get the base address of the module(the main exe).</p> <pre><code>DWORD dwGetModuleBaseAddress(DWORD dwProcessIdentifier, WCHAR *lpszModuleName) { HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, dwProcessIdentifier); DWORD dwModuleBaseAddress = 0; if(hSnapshot != INVALID_HANDLE_VALUE) { MODULEENTRY32 ModuleEntry32 = {0}; ModuleEntry32.dwSize = sizeof(MODULEENTRY32); if(Module32First(hSnapshot, &amp;ModuleEntry32)) { do { if(wcscmp(ModuleEntry32.szModule, lpszModuleName) == 0) { dwModuleBaseAddress = (DWORD)ModuleEntry32.modBaseAddr; break; } } while(Module32Next(hSnapshot, &amp;ModuleEntry32)); } CloseHandle(hSnapshot); } return dwModuleBaseAddress; } </code></pre> <p>That is how I try to do it. This is after my dll is injected, but it seems to return INVALID_HANDLE_VALUE for some reason. I found the function from one website and modified it a bit but it still doesn't seem to work. If you have a more cleaner method to get the base address I would be glad to know about it.</p> <p>Edit the problem is now with this line:</p> <pre><code>if(wcscmp(ModuleEntry32.szModule, lpszModuleName) == 0) </code></pre> <p>It never is 0 but there is a module name I am looking for, I can see my exe in the debugger but this comparison doesn't somehow work.</p> <p>This is how I call the function</p> <pre><code>HWND window = FindWindow(0, LPCWSTR("test")); DWORD pID = 0; GetWindowThreadProcessId(window, &amp;pID); base = dwGetModuleBaseAddress(pID, (WCHAR*)("test")); </code></pre>
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    1. PTQuestion
    1. USSamuli Lehtonen
    1. USSamuli Lehtonen
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    1. COyou can use getlasterror() to see what's happening
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      1. POGetModuleHandle return INVALID_HANDLE_VALUE
      1. USspiritwolfform
    2. COAre you saying CreateToolhelp32Snapshot returns INVALID_HANDLE_VALUE? Check GetLastError() for the error code. That might give you a better idea of what might have happened.
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      1. POGetModuleHandle return INVALID_HANDLE_VALUE
      1. USTripShock
    3. COOkay, now the problem is with this line: if(wcscmp(ModuleEntry32.szModule, lpszModuleName) == 0)
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      1. POGetModuleHandle return INVALID_HANDLE_VALUE
      1. USSamuli Lehtonen
 

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