C# screenshot another application

Question

i would like to take a screenshot for a form of an opened application which is not on top without bringing this app on top to capture screenshot of the form ! i want to do it on C# i have searched a lot and i found nothing. would you please give any code hints?

If a "screenshot" is an image of all or part of a screen, then how do you suppose this would work? — STLDev, Nov 02 '17 at 20:56
This sounds like it will involve UI Automation and/or an accessibility API. Which operating systems are you interested in? — jpaugh, Nov 02 '17 at 21:29

score 0 · Answer 1 · answered Nov 02 '17 at 21:08

The PrintWindow API (MSDN) method can do that. You can use the API from C# using P/Invoke. The website pinvoke.net has the definition you need.

[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool PrintWindow(IntPtr hwnd, IntPtr hDC, uint nFlags);

You'll need a window handle which you can get like in this SO answer.

C# screenshot another application

1 Answers1