Question

My program, finds any subwindows, the case if an 3-part app shows an Error box, then i want to close it.. and it works fine, when the server not is locked.

Code:

[DllImport("user32", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private extern static bool PostMessage(IntPtr hwnd, uint msg, IntPtr WParam, IntPtr lParam);

    [DllImport("user32", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private extern static bool BringWindowToTop(IntPtr hwnd);

public static bool FocusWindowAndSendEnter(IntPtr hWnd)
{
    try
    { // hWnd = pointer to subwindow, like messagebox.

        uint WM_KEYDOWN = 0x0100;

       //Set focus
      var res1 =  BringWindowToTop(hWnd);

        //Send enter_Key 
      var res2 = PostMessage(hWnd, WM_KEYDOWN, (IntPtr)Keys.Enter, IntPtr.Zero);

      return (res1 == res2 == true);

    }
    catch (Exception ex)
    {
        Logger.LogException(MethodInfo.GetCurrentMethod().Name, ex);
    }

    return false;
}

Can this be done if the server is locked, but running?

Answer 1

When a computer is locked, you are very limited in what you can do – for security purposes. I doubt there is a way around this unless you either stop the computer being locked, or stop the message box from showing up in the first place.

You’re attempting to solve a problem in the wrong methods.

Find out what you can about that error message box and do what you can to prevent that happening. Don’t expect to have much you can do when the PC is locked.