测试directDraw是否被支持， 有些机子可能也不支持directdraw哦

static BOOL IsDirectDrawSupported()
{
    HDC hDC;
    DWORD Planes;
    DWORD Bpp;

    hDC = GetDC(NULL);
    Planes = GetDeviceCaps(hDC, PLANES);
    Bpp = GetDeviceCaps(hDC, BITSPIXEL);
    ReleaseDC(NULL, hDC);

    if (Planes * Bpp < 8)
        return FALSE;

    return TRUE;
}