DllMain not being called

Question

I have a DllMain defined as so:

BOOL APIENTRY DllMain( HMODULE hModule,
                   DWORD  ul_reason_for_call,
                   LPVOID lpReserved
                 )
{ 

int i=0, DoHijack=0;

switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
    hMod = hModule;
    hProcessCenter = ::FindWindow(NULL, _T("Form1"));

    ExtractPaths(hModule, ExePath, &kNTIExeName, kNTIDllPath, &kNTIDllName);

    //Only hook target processses
    for(i=0; i < NB_TARGETS; i++)
    {
        if(strstr(kNTIExeName, Targets[i]))
            DoHijack=1;
    }

    if(DoHijack)
    {
            DetourTransactionBegin();
        DetourUpdateThread(GetCurrentThread());
        DetourAttach(&(PVOID&)Real_DrawText, Mine_DrawText); // <- magic
        DetourAttach(&(PVOID&)Real_ExtTextOut, Mine_ExtTextOut); 
        DetourTransactionCommit();
    break;   
    }      

case DLL_THREAD_ATTACH:
        break;
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
        DetourTransactionBegin(); 
        DetourUpdateThread(GetCurrentThread());
        DetourDetach(&(PVOID&)Real_DrawText, Mine_DrawText);
        DetourDetach(&(PVOID&)Real_ExtTextOut, Mine_ExtTextOut); // <- magic
        DetourTransactionCommit();
    break;
}
return TRUE;
 }

This is a project that I have bought home from work and after I compile and run it the dllmain is never being called, hence my problem which is the process_attach switch is never hit. What could be causing this to occur? Something in the compiler, one of the linking options?

The dll functions perfectly at work...

Thanks.

What do you do inside DllMain? Can you post some code please? — nakiya
What kind of company do you work for that ships products that hides DLLs? This is malicious, voting to close. — Hans Passant

Marcelo Cantos Marcelo Cantos · Accepted Answer · 2010-10-24T04:37:41

You can't "run" a DLL. Perhaps you've built it as an executable project, for which DllMain has no special significance.

DllMain not being called

2 Answers