Using Native Windows On Screen Keyboard in WPF App

Question

I need to use an OnScreenKeyboard Component like Native Windows OSK in my Wpf application. I can call the UI by Process.Start("osk.exe") but the UI appears on top of the main ui window. I want to start the OSK app just bottom of my app. Is this possible with any arguments? -eg process.StartInfo.WindowPosition=xxx- I'd prefer to use it before I create my own Component.

Answer 1

OK. I solved my problem with Win32 SetWindowPos method. Sharing if it might help others. Below code is opening and resizing/positioning the Native OSK.exe. It places the keyboard relative to the mouse position.

[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
    public int X;
    public int Y;

    public static implicit operator Point(POINT point)
    {
        return new Point(point.X, point.Y);
    }
}

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

    public static Point GetCursorPosition()
    {
        POINT lpPoint;
        GetCursorPos(out lpPoint);
        //bool success = User32.GetCursorPos(out lpPoint);
        // if (!success)

        return lpPoint;
    }


    private void OSKMenuItem_Click(object sender, RoutedEventArgs e)
    {
        Process osk = new Process();
        osk.StartInfo.FileName = "osk.exe";
        osk.StartInfo.WindowStyle = ProcessWindowStyle.Normal;

        osk.Start();

        Task.Delay(1000).ContinueWith((a) => {
            Point p = GetCursorPosition();

            try
            {
                IntPtr target_hwnd = FindWindowByCaption(IntPtr.Zero, "On-Screen Keyboard");
                if (target_hwnd == IntPtr.Zero)
                {
                    Microsoft.Windows.Controls.MessageBox.Show("Error");
                }
                SetWindowPos(target_hwnd, IntPtr.Zero, (int)p.X - 200, (int)p.Y, 1300, 600, 0);
            }
            catch (Exception ex)
            {

                //throw;
            }
        });