How to get selected text of any application into a windows form application

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After some reading, I have found the way:

  1. Hook the double click event using something like globalmousekeyhook.codeplex.com
  2. (Optional) Save the current state of the clipboard
  3. Get The current mouse position with GetCursorPos from user32.dll

  4. Get windows based on cursor position with WindowFromPoint from
    user32.dll

    [DllImport("user32.dll")]
public static extern IntPtr WindowFromPoint(Point lpPoint);

[DllImport("user32.dll")]
public static extern bool GetCursorPos(out Point lpPoint);

public static IntPtr GetWindowUnderCursor()
{
   Point ptCursor = new Point();

   if (!(PInvoke.GetCursorPos(out ptCursor)))
      return IntPtr.Zero;

   return WindowFromPoint(ptCursor);
}

  5. Send copy command with SendMessage form user32.dll (see
    Using User32.dll SendMessage To Send Keys With ALT Modifier)

  6. Your Code
  7. (Optional) Restore the clipboard content saved in step 2

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