Screen capture to Direct2D compatible bitmap

Question

I need to capture the screen of a windows given its HWND handle and store the capture in a ID2D1Bitmap object in order to draw this bitmap by means of my render target.

How can I achive this result?

Answer 1

Direct2D doesn't provide such functionality.

A possible way to go is if you first capture the screen via GDI (1) and then create a ID2D1Bitmap from the returned bitmap handle (2).

1. Getting a HBITMAP - Check this answer: https://stackoverflow.com/a/5164267/3962893. You need the part till the HBITMAP hbDesktop = CreateCompatibleBitmap( hdc, width, height); The hbDesktop variable will contain a handle to the screen captured bitmap.

2. Creating an ID2D1Bitmap from a HBITMAP - check this answer: https://stackoverflow.com/a/27500938/3962893. It copies an icon to a ID2D1Bitmap, but the workflow is identical. Except:

   hIcon := SendMessage(Handle, WM_GETICON, ICON_BIG, 0); .... wicFactory.CreateBitmapFromHICON(hIcon, wicBitmap);

   that you have to change to:

   wicFactory.CreateBitmapFromHBITMAP(hbDesktop, wicBitmap);