How to stop Wndproc() loop?

Question

I have overridden wndproc() to use Hotkeys. but the form won't close anymore. and onclosing form the program stuck in an infinite loop in wndproc().

 protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);

        if (m.Msg == 0x0312)
        {


            Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF);                  

            int id = m.WParam.ToInt32();                                        


            MessageBox.Show("Hotkey has been pressed!");
            // do something
        }

    }

i have set the e.cancel to true and added following codes in the OnFoemClosing method `

 e.Cancel = false;
 base.OnFormClosing(e);

But nothing happens.

Have you tried set the KeyPreview property = true and manage keyPress event instead to tweak the WndProc? — mnieto, Feb 07 '19 at 08:33
the problem with the Keypreiew is that the associated from must be open to work.if the form is minimized or not selected it not work. but i need a hotkey that works with interrupts service routines. — Mamo Ghandi, Feb 07 '19 at 09:24
In the body of OnClosingForm method i have set 'e.Cancel=false' — Mamo Ghandi, Feb 07 '19 at 09:58

score -1 · Answer 1 · edited Jul 17 '19 at 10:33

-1

[DllImport("user32.dll")]
static extern bool DestroyWindow(IntPtr hWnd);

//Closes the form
btnCloseWindow_Click(object sender, EventArgs e)
{
     DestroyWindow(this.Handle);
}`[DllImport("user32.dll")]
static extern bool DestroyWindow(IntPtr hWnd);

//Closes the form
btnCloseWindow_Click(object sender, EventArgs e)
{
     DestroyWindow(this.Handle);
}`

edited Jul 17 '19 at 10:33

Amira Bedhiafi

6,070
6
17
48

answered Jul 17 '19 at 10:01

sudeep

1

How to stop Wndproc() loop?

1 Answers1