DWORD WINAPI tp (LPVOID);

DWORD APIENTRY DllMain (HMODULE hModule,  DWORD ul_reason_for_call, LPVOID IpReserved)
{
    switch(ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        CreateThread(NULL,NULL,tp,NULL,NULL,NULL);
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
}