Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Prevent user enter ALT-F4

Posted on 2011-03-25
6
Medium Priority
?
477 Views
Last Modified: 2013-12-17
Hi,

How to prevent user close program by using ALT-f4?

Thanks,
Jt
0
Comment
Question by:jtran007
6 Comments
 
LVL 30

Expert Comment

by:Randy Downs
ID: 35216460
Try this - http://stackoverflow.com/questions/1846109/disable-submit-with-key-press-event

It's for the enter key but you just need the code generated by ALT F4 to change it

Javascript code

    function disableEnterKey(e)     {          var key;            if(window.event)               key = window.event.keyCode;     //IE          else               key = e.which;     //firefox           if(key == 13)               return false;          else               return true;     } KeyCode 13 stands for the enter key.

0
 
LVL 11

Expert Comment

by:SAMIR BHOGAYTA
ID: 35216559
Hi, try this code

protected override void OnClosing(CancelEventArgs e)
{
System.Diagnostics.StackTrace O = new System.Diagnostics.StackTrace(true);
System.Diagnostics.StackFrame F = O.GetFrame(7);
if(F.GetMethod().Name == "DefWndProc")
e.Cancel = true; // user ended the application (ALT-F4, clicking the
corner X etc)
}
0
 

Author Comment

by:jtran007
ID: 35216560
Hi ,

I use c#. Please give example on c#.

Thanks,
JT
0
Fill in the form and get your FREE NFR key NOW!

Veeam is happy to provide a FREE NFR server license to certified engineers, trainers, and bloggers.  It allows for the non‑production use of Veeam Agent for Microsoft Windows. This license is valid for five workstations and two servers.

 
LVL 5

Expert Comment

by:felipevidaurri
ID: 35218032
Try using FormClosing Event:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    e.Cancel = true;
}
0
 
LVL 33

Accepted Solution

by:
Todd Gerbert earned 1000 total points
ID: 35218267
Set the Form's KeyPreview to true, and handle the form's KeyDown event. If the KeyPressed is F$ and the ALT key is currently down, then cancel the KeyPress by telling .Net we handled the key press, so it doesn't need to.  This will leave the user still able to close the form with the mouse, but not by pressing ALT-F4.

public partial class Form1 : Form
{
	public Form1()
	{
		InitializeComponent();
	}

	private void Form1_KeyDown(object sender, KeyEventArgs e)
	{
		if (e.Alt && e.KeyCode == Keys.F4)
			e.Handled = true;
	}

		

}

Open in new window

0
 

Author Closing Comment

by:jtran007
ID: 35269002
Thanks,
JT
0

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
Simulator games are perfect for generating sample realistic data streams, especially for learning data analysis. It is even useful for demoing offerings such as Azure stream analytics, PowerBI etc.
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …
Look below the covers at a subform control , and the form that is inside it. Explore properties and see how easy it is to aggregate, get statistics, and synchronize results for your data. A Microsoft Access subform is used to show relevant calcul…
Suggested Courses

877 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question