How-to exit an application correctly

Submitted on: 1/19/2015 3:11:00 AM
By: Slider (from psc cd)  
Level: Beginner
User Rating: By 7 Users
Compatibility: VB 4.0 (32-bit), VB 5.0, VB 6.0
Views: 1894
     This article demonstrates how to exit an application cleanly with user prompting (if required) without using the END Statement.

This article has accompanying files

				Too many programmers these days use the end statement in their programs and under certain conditions leave fragements behind in memory, the application doesn't shut down fully, or in extreme cases cause GPFs.
To unload applications correctly, the statement 'Unload Me' should be used. The 'Form_QueryUnload' event will be triggered and at this point we should ask the user what to do. The reason why we should put a "Save Changes" propmt in the 'Form_QueryUnload' event is that there is more than one way to close an application. If the System Shutdown is invoked, or the Close "X" button is pressed, then we can catch these events and give the user a chance to save thier work.
Attached are two framework applications to demostrate how to close A) SDI application and B) MDI application.
If you find this article & code useful, then please leave me a comment and I'll add more useful articles.

winzip iconDownload article

Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. Afterdownloading it, you will need a program like Winzip to decompress it.Virus note:All files are scanned once-a-day by Planet Source Code for viruses, but new viruses come out every day, so no prevention program can catch 100% of them. For your own safety, please:
  1. Re-scan downloaded files using your personal virus checker before using it.
  2. NEVER, EVER run compiled files (.exe's, .ocx's, .dll's etc.)--only run source code.
  3. Scan the source code with Minnow's Project Scanner

If you don't have a virus scanner, you can get one at many places on the net

Other 18 submission(s) by this author


Report Bad Submission
Use this form to tell us if this entry should be deleted (i.e contains no code, is a virus, etc.).
This submission should be removed because:

Your Vote

What do you think of this article (in the Beginner category)?
(The article with your highest vote will win this month's coding contest!)
Excellent  Good  Average  Below Average  Poor (See voting log ...)

Other User Comments

 There are no comments on this submission.

Add Your Feedback
Your feedback will be posted below and an email sent to the author. Please remember that the author was kind enough to share this with you, so any criticisms must be stated politely, or they will be deleted. (For feedback not related to this particular article, please click here instead.)

To post feedback, first please login.