RE: How to override form's Maximize button operation?

From: Jeffrey Tan[MSFT] (v-jetan_at_online.microsoft.com)
Date: 03/04/05 

Date: Fri, 04 Mar 2005 05:33:23 GMT

Hi Dave,

Thanks for your posting!!

When a form's window is maximized, no SW_MAXIMIZE is sent to the WndProc,
instead, a WM_SYSCOMMAND message(whose wParam is SC_MAXIMIZE) is sent to
the Window procedure, so we may intercept and filter the maximize operation
with the code snippet below:

const int WM_SYSCOMMAND= 0x0112;
const int SC_MAXIMIZE= 0xF030;
protected override void WndProc(ref Message m)
{
        if(m.Msg==WM_SYSCOMMAND)
        {
                if((int)m.WParam==SC_MAXIMIZE)
                {
                        MessageBox.Show("Maximized!!");
                        return;
                }
        }
        base.WndProc (ref m);
}
It works well on my side. Hope it helps
========================================================
Thank you for your patience and cooperation. If you have any questions or
concerns, please feel free to post it in the group. I am standing by to be
of assistance.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.