Visual Studio C# Windows Forms Application touch screen exception error

Question

I have Windows Forms Visual Studio Project; I have added the code to be able to use a finger instead of the mouse on touch screen monitor.

When I use a mouse, everything is working, but when I use a finger to top and double top on the screen also working only if I do it on any item on the form, but wh

en I use a finger on a form (on the empty space) I get an exception error, I attached a picture as well as code for the finger as a pointer.

Anyone knows what should be done, thanks in advance.

Code Here:

protected override void WndProc(ref Message m)

{

    switch (m.Msg)

    {

        case Win32.WM_POINTERDOWN:

        case Win32.WM_POINTERUP:

        case Win32.WM_POINTERUPDATE:

        case Win32.WM_POINTERCAPTURECHANGED:

            break;

        default:

            base.WndProc(ref m);

            return;

    }

    int pointerID = Win32.GET_POINTER_ID(m.WParam);

    Win32.POINTER_INFO pi = new Win32.POINTER_INFO();

    if (!Win32.GetPointerInfo(pointerID, ref pi))

    {

        Win32.CheckLastError();

    }

    Point pt = PointToClient(pi.PtPixelLocation.ToPoint());

    MouseEventArgs me = new MouseEventArgs(System.Windows.Forms.MouseButtons.Left, 1, pt.X, pt.Y, 0);

    switch (m.Msg)

    {

        case Win32.WM_POINTERDOWN:

            Console.WriteLine("TOCOU" + pt);

            (Parent as Form1).Form1_MouseDown((this as object), me);

            break;

        case Win32.WM_POINTERUP:

            Console.WriteLine("LEVANTOU");

            (Parent as Form1).Form1_MouseUp((this as object), me);

            break;

        case Win32.WM_POINTERUPDATE:

            Console.WriteLine("UPDATE");

            (Parent as Form1).Form1_MouseMove((this as object), me);

            break;

    }

}

Answer 1

Hello there, I'm Gopal an Independent Advisor. I will try my best to help you.

I apologize for the inconvenience. As the Community forum is primarily focused on consumer-related questions, I kindly request that you post your question on our sister forum, Microsoft Q&A. This platform is specifically designed for IT administrators, developers, and professionals, providing a better chance of receiving a knowledgeable and prompt response to your query. You can submit your question by visiting the following link: https://learn.microsoft.com/en-us/answers/tags/...

Regards,

Gopal

Answer 2

Sorry about that, will do.