改变分辨率

    DEVMODE lpDevMode;
    lpDevMode.dmBitsPerPel = 32;
    lpDevMode.dmPelsWidth = 1024;
    lpDevMode.dmPelsHeight = 768;
    lpDevMode.dmSize = sizeof(lpDevMode);
    lpDevMode.dmFields = DM_PELSWIDTH | DM_BITSPERPEL | DM_PELSHEIGHT;
    LONG res;
    res = ChangeDisplaySettings(&lpDevMode, 0);