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Asked: 2026-05-14T23:00:01+00:00

How to make a screenshot of program window using WinAPI & C#? I sending

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How to make a screenshot of program window using WinAPI & C#?

I sending WM_PAINT (0x000F) message to window, which I want to screenshot, wParam = HDChandle, but no screenshot in my picturebox. If I send a WM_CLOSE message, all waorking (target window closes). What I do wrong with WM_PAINT? May be HDC is not PictureBox (WinForms) component? P.S. GetLastError() == ""

[DllImport("User32.dll")]
public static extern Int64 SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
  .....

SendMessage(targetWindowHandle, 0x000F, pictureBox.Handle, IntPtr.Zero);
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1 Answer

  1. Editorial Team

    pictureBox.Handle is a window handle, not a DC handle. There are several guides online for doing screenshots. One is here. See also @In silico’s answer.

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