Question

VB6: Select Case or If...Then...Else

Asked by: admiller

Image Control Array:
Image1 (<array 0...>)

Event:
MouseDown (Right_Click)--activates pop-up menu relative to specific image control array.

Question:
Do you use a Select Case or If...Then...Else decision statement? What is the code?

admiller

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Asked On
1999-06-17 at 16:25:47ID10172884
Tags

case

,

select

,

vb6

Topic

VB Controls

Participating Experts
4
Points
50
Comments
7

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Answers

 

by: admillerPosted on 1999-06-17 at 16:27:59ID: 1494629

Let me know if you need a further explanation on this question. Perhaps I could send a diagram?

admiller

 

by: emoreauPosted on 1999-06-17 at 16:42:59ID: 1494630

Select Case statement is appropriate when you want to compare one expression to a series of values. Because the expression is evaluated only once, then cached and then compared to the values, it is faster than a long series of if ... elseif ... end if.

The syntax is quite simple:

Select Case (expression)
   Case (Value1)
      (Statements)
   Case (Value1)
      (Statements)
   Case (Value1)
      (Statements)
   Case Else
      (Statements)
End Select

In your case, it should look like:
If Button = vbRightButton then
   Select Case Index
      Case 0
         me.PopupMenu menu0
      Case 1
         me.PopupMenu menu1
      Case 2
         me.PopupMenu menu2
      Case Else
         MsgBox "Error"
   End Select
End If

 

by: caraf_gPosted on 1999-06-18 at 01:19:21ID: 1494631

Another neat trick...

Let's say you really want to code this:

If <Expression> Then
ElseIf <AnotherExpression> Then
ElseIf <YetAnotherExpression> Then
...
Else
End If

And now you want to translate this to a select case statement. How do you do it?

If the expressions are very similar, it could be easy:

If A = 1 Then
ElseIf A = 2 Then
...

Could be translated to
Select Case A
Case 1
Case 2
...

But how to translate something where the cases are wildly different?

If A = 5 Then
ElseIf Q <> F Then
ElseIf Z + 1 = 3 Then
Else
End If

?

Easy....

Select Case True
Case A = 5
Case Q <> F
Case Z + 1 = 3
Case Else
End Select

Just use "True" in the select case, and compare all the original expressions to that.

 

by: mark2150Posted on 1999-06-18 at 06:11:01ID: 1494632

caraf_g! Good tip! Never thought of that and have had that exact problem come up on several occassions!

Cool!

M

 

by: caraf_gPosted on 1999-06-18 at 06:22:47ID: 1494633

:-)
That's more or less how I felt when this came to me in a flash of inspiration.

 

by: admillerPosted on 1999-06-18 at 08:31:38ID: 1494634

Thanks for your help.

--admiller

 

by: imahmPosted on 1999-06-20 at 20:37:34ID: 1494635

By using array you need to do some programming

private sub option_click(index as integer)

select case index
         case 1
             .............
        case 2
            ..............

end select

tips : If you want to read the option button index no  ---> option(index).index

20120131-EE-VQP-002

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