1 VOID DrawTestInMem(HDC hDevDc) 2 { 3     int screenWidth = GetDeviceCaps(hDevDc, HORZRES); 4     int screenHeight = GetDeviceCaps(hDevDc, VERTRES); 5  6     HBITMAP hBmpDc = CreateCompatibleBitmap(hDevDc, screenWidth/2, screenHeight); 7     HDC hMemDc = CreateCompatibleDC(hDevDc); 8     SelectObject(hMemDc, hBmpDc); 9     BitBlt(hMemDc, 0, 0, screenWidth / 2, screenHeight, hDevDc, 0, 0, SRCCOPY);10     11     printf("screenWidth = %d, screenHeight = %d\n", screenWidth, screenHeight);12     WCHAR str[MAX_PATH];13     wsprintfW(str, L"screenWidth = %d, screenHeight = %d\n", screenWidth, screenHeight);14     TextOut(hMemDc, 0, 0, str, wcslen(str));15     BitBlt(hDevDc, screenWidth/2+1, 0, screenWidth / 2, screenHeight, hMemDc, 0, 0, SRCCOPY);16 17 }18 19 int APIENTRY wWinMain(_In_ HINSTANCE hInstance,20                      _In_opt_ HINSTANCE hPrevInstance,21                      _In_ LPWSTR    lpCmdLine,22                      _In_ int       nCmdShow)23 {24     UNREFERENCED_PARAMETER(hPrevInstance);25     UNREFERENCED_PARAMETER(lpCmdLine);26 27     HDC hdc = GetDC(NULL);28     29     DrawTestInMem(hdc);30 }