MemDc Test

VOID DrawTestInMem(HDC hDevDc)
{
    int screenWidth = GetDeviceCaps(hDevDc, HORZRES);
    int screenHeight = GetDeviceCaps(hDevDc, VERTRES);

    HBITMAP hBmpDc = CreateCompatibleBitmap(hDevDc, screenWidth/2, screenHeight);
    HDC hMemDc = CreateCompatibleDC(hDevDc);
    SelectObject(hMemDc, hBmpDc);
    BitBlt(hMemDc, 0, 0, screenWidth / 2, screenHeight, hDevDc, 0, 0, SRCCOPY);
    
    printf("screenWidth = %d, screenHeight = %d
", screenWidth, screenHeight);
    WCHAR str[MAX_PATH];
    wsprintfW(str, L"screenWidth = %d, screenHeight = %d
", screenWidth, screenHeight);
    TextOut(hMemDc, 0, 0, str, wcslen(str));
    BitBlt(hDevDc, screenWidth/2+1, 0, screenWidth / 2, screenHeight, hMemDc, 0, 0, SRCCOPY);

}

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    HDC hdc = GetDC(NULL);
    
    DrawTestInMem(hdc);
}