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APIHijack - A Library for easy DLL function hooking.

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15 Sep 2000 1  
This library allows you to replace functions in other DLLs with functions from your own DLL.
  • Download source files and demo project - 102 Kb

    Introduction

    Based on DelayLoadProfileDLL.CPP, by Matt Pietrek for MSJ February 2000. This code is intended to be included in a DLL inserted through a global Windows Hook (CBT hook for example). It will replace functions from other DLLs (e.g. DDRAW.DLL) with functions from your DLL.

    Functions are hooked by passing a parameter structure to the HookAPICalls() function as follows:

    SDLLHook D3DHook = 
    {
        "DDRAW.DLL",
        false, NULL,    // Default hook disabled, NULL function pointer.
        {
            { "DirectDrawCreate", MyDirectDrawCreate },
            { NULL, NULL }
        }
    };
    
    BOOL APIENTRY DllMain( HINSTANCE hModule, DWORD fdwReason, LPVOID lpReserved)
    {
        if ( fdwReason == DLL_PROCESS_ATTACH )  // When initializing....
        {
            hDLL = hModule;
    
            // We don't need thread notifications for what we're doing.  Thus, 
            // get rid of them, thereby eliminating some of the overhead of 
            // this DLL
            DisableThreadLibraryCalls( hModule );
    
            // Only hook the APIs if this is the right process.
            GetModuleFileName( GetModuleHandle( NULL ), Work, sizeof(Work) );
            PathStripPath( Work );
    
            if ( stricmp( Work, "myhooktarget.exe" ) == 0 )
                HookAPICalls( &D3DHook );
        }
    
        return TRUE;
    }
    

    Now all that remains is to get your DLL loaded into the target process.

  • License

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