[tutorial] Visual Basic 6 - Closing Programs Right, Why END is bad

This tutorial applies to all those people who insist upon using "End" to close their programs:

End stops the program immediately without any thought as to what's going on - it's like a high speed train hitting a brick wall. It can cause unwanted errors and is bad programming practice in general. END gets rids of the form, but NOT its leftovers. This leaves a bunch of memory that will still be in use even after your program has supposedly closed. An object or variable won't be terminated properly - it's just not a graceful exit.

The only time that it's okay to use end is in Form_Load, because there is essentially nothing to unload. Ending the program abruptly also ignores whatever code you have in your Form Terminate, Unload, or UnloadQuery subs.

If you don't have leftover objects that you have neglected to nullify (ie - you are a really meticulous coder) and you don't have multiple forms loaded all at once, then "unload me" is the correct thing to do. Otherwise, putting a variation of the following in your Unload sub is the best:

Code:

Private Sub Form_Unload(Cancel as Integer)

On Error Resume Next 'should be at the top of this sub regardless of circumstances

' If you only have 1 form:
Dim o As Object
For Each o In Me
Set o = Nothing
Unload o
Next

' If you have multiple forms and you want to close the entire app:

Dim f As Form
For Each f In Forms
Set f = Nothing
Unload f
next

' If you have multiple forms and possible leftovers (this is the best way, just to be safe):

Dim o As Object
Dim f As Form
For Each f In Forms
For Each o In f
Set o = Nothing
Unload o
Next
Set f = Nothing
Unload f
Next

' NOW you can put whatever you want, because you safely and methodically cleaned up your program's trail:

Unload Me
End ' you can even put end if you really really want, because at this point it's safe and there's no garbage left to clean up

End Sub

 

 

 

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How to close 1 form and open another in a button
[tutorial] Visual Basic 6

Can somone Please post a snippet of code on how to close a form and open one in a button.

-question by Sanyo

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how to show multiple form in visualbasic
[tutorial] Visual Basic 6

How to show multiple form in visual basic

-reply by mahaveer

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how to close a form, and open one in a button
[tutorial] Visual Basic 6

Replying to iGuest

Haha aiite m8 prety much

Imagine this

You got 1 form, say form1 , and you have a command button rite

And you got one that you want to open , called form 2



What you want is

When say

Sub_command_click

Form1.Visible = False

Form2.Visible = True



and yeh.. Thats it HAHAH

So prty much, when that BUTTON is click

BAM!, form 1 = disappeared

Form 2 = INFRONT OF YOU = 0

Haha <3 hope that helps m8



Xx.



-reply by TheLove

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how to close a form, and open one in a button
[tutorial] Visual Basic 6

Replying to iGuest
Haha aiite m8 prety much
Imagine this
You got 1 form, say form1 , and you have a command button rite
And you got one that you want to open , called form 2

What you want is
When say
Sub_command_click
Form1.Visible = False
Form2.Visible = True

and yeh.. Thats it HAHAH
So prty much, when that BUTTON is click
BAM!, form 1 = disappeared
Form 2 = INFRONT OF YOU = 0
Haha <3 hope that helps m8

Xx.

-reply by TheLove

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VTC Tutorial for VB 6 is good..Please visit website of Virtual training Company to get VTC VB6 Video Tutorial
VTC Tutorials are helpful to study programming languages

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...problem
[tutorial] Visual Basic 6

There is a small problem with the code snippets - the object should be unloaded before being deallocated:

Dim o As Object
For Each o In Me
    Unload o
    Set o = Nothing
Next

Dim f As Form
For Each f In Forms
   Unload f
   Set f = Nothing
next

Dim o As Object
Dim f As Form
For Each f In Forms
   For Each o In f
       Unload o
       Set o = Nothing
   Next
   Unload f
   Set f = Nothing
Next

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I don't mean to be rude... but VB 6 is still being used? It was the last version of VB before .NET was released, and I thought everybody had moved onto that.

If that is not the case, I would love to enlightened. Regardless, it is a good language to get started in. The syntax might not make sense at first, but it is a pleasure once you understand it.

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To close 1 form and open another 1 is simply






and



to open multiple what do you mean like on startup or open them 1 by one?

 

 

 

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