Am I BitBlt'ing Bitmap correctly? wrong code?

[gafferuk]

Im trying to replace my gdi+ DrawImage() code to BitBlt'ing code to speed things up but my image won't paint to the screen?

Is this the correct code? thanks.

hdc = BeginPaint (hWnd, &ps);
HDC hdcMem = CreateCompatibleDC(hdc);
SelectObject(hdcMem, myBitmap);
BitBlt(hdc, 0, 0, myBitmap->GetWidth(), myBitmap->GetHeight(), hdcMem, 0, 0, SRCCOPY);
DeleteDC(hdcMem);


When I was using DrawImage() everything was fine. but too slow.
Im really am sure this is not the right code.

[hoxsiew]

Where is "MyBitmap" defined/initialized?

[CBasicNet]

Did the OP call EndPaint()?

[ovidiucucu]

In SelectObject, you have to pass a HBITMAP handle and not a pointer to Gdiplus::Bitmap object.

   //...
   HDC hdcMem = ::CreateCompatibleDC(hdc);
   HBITMAP hBitmap = NULL;
   Color color;
   myBitmap->GetHBITMAP(color, &hBitmap);
   HBITMAP hBitmapOld = (HBITMAP)::SelectObject(hdcMem, hBitmap);
   ::BitBlt(hdc, 0, 0, myBitmap->GetWidth(), myBitmap->GetHeight(), hdcMem, 0, 0, SRCCOPY);
   ::SelectObject(hdcMem, hBitmapOld);
   ::DeleteDC(hdcMem);
   // ...