Writing Your Own Install and Uninstall Code

Listing 1 Source for MagicDel.dll — a self-deleting DLL

#include <windows.h>
HMODULE g_hmodDLL;

extern "C" BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD reason, LPVOID)
{
    if (reason == DLL_PROCESS_ATTACH)
        g_hmodDLL = hinstDLL;
    return TRUE;
}

extern "C" __declspec(dllexport) void CALLBACK MagicDel(HWND,
                                                        HINSTANCE,
                                                        LPTSTR lpCmdLine,
                                                        int)
{
    // delete the executable file that created this process
    Sleep(2000);
    DeleteFile(lpCmdLine);

    // delete ourself
    char filenameDLL[MAX_PATH];
    GetModuleFileName(g_hmodDLL, filenameDLL, sizeof(filenameDLL));

    __asm
    {
        lea     eax, filenameDLL
        push    0
        push    0
        push    eax
        push    ExitProcess
        push    g_hmodDLL
        push    DeleteFile
        push    FreeLibrary
        ret
    }
}