Screenshot with BitBlt results in black image on Windows 10

Question

I am using the code below to capture a screenshot of the currently active window. This code comes from Capture screenshot Including Semitransparent windows in .NET, with a f

Answer 1

I can suggest a simple workaround:

First use GetForegroundWindow to get the active window rect. Then call GetDesktopWindow and use that handle with the call to BitBlt:

Just add a single line to above code:

          IntPtr hDesk = GetForegroundWindow();
          ...       // get dimensions of active window    
          hDesk = GetDesktopWindow();  // add this line
          IntPtr hSrce = GetWindowDC(hDesk);
          IntPtr hDest = CreateCompatibleDC(hSrce);

Works fine.

Answer 2

Likely it doesn't work for these 2 browsers because they use a hardware-accelerated graphics context (OpenGL- or DirectX-based) to render their content, and this is incompatible with GDI-based calls.