Basic DLL

// dllmain.cpp : Defines the entry point for the DLL application.
#include <Windows.h>
#include<iostream>

HMODULE myhModule;

DWORD __stdcall EjectThread(LPVOID lpParameter) {
    Sleep(100);
    FreeLibraryAndExitThread(myhModule, 0);
}

DWORD WINAPI Menue() {
    AllocConsole();
    FILE* fp;
    freopen_s(&fp, "CONOUT$", "w", stdout); // output only
    std::cout << "test" << std::endl;
    while (1) {
        Sleep(100);
        if (GetAsyncKeyState(VK_NUMPAD0))
            break;
    }
    fclose(fp);
    FreeConsole();
    CreateThread(0, 0, EjectThread, 0, 0, 0);
    int i = 0;
    return 0;
}


BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        myhModule = hModule;
        CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Menue, NULL, 0, NULL);
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}