Is there a trick to passing a control as a function argument? 1

[Jasen]

So, I have a function to move controls, such as:

private function MoveMe(byref obj as Frame) as boolean

   obj.Left = 0
etc, etc

I've tried multiple ways of passing in my frame name, but nothing works. I get type mismatch error. I figured just something like:
MoveMe(Frame1)
would work, and after failing that, tried frame1.name and frame1.Hwnd.
I've tried changing the argument to "Control" and "Object" in the function declaration, both give the same result.
I know this has to be possible, where's my mistake at?

 

[trollacious]

Is the function in the same file as the form?

Try using Formname.Framename as the argument instead of just the frame name.

Lee

 

[dglienna]

Use Control

MoveMe(byref obj as Frame) as boolean

David

 

[dglienna]

Oops. That got changed back to what I copied. It should be this:

MoveMe(byref obj as Control) as boolean

sorry.

David

 

[strongm]

Do not call your function like this:

MoveMe (Frame1)

as it isn't doing what you think it is doing¹. Instead use:

Call MoveMe(Frame1)

or

result=MoveMe(Frame1)




¹WHat is happening is a combination of two things. Firstly, because you have not hinted otherwise (by use of Call or by ssigning the result of the function to a variable), VB evaluates the expression in the brackets first before passing it to the function. Secondly, VB objects have default properties. For a Frame control the default property is the caption - so when object Frame1 gets evaluated it actually returns a string containing the caption.

A search in this forum should find further discussion on the subject of parenthesis

 

[chiph]

Thanks, strongm, that's almost certainly what's happening with the OP. I always automatically used the Call way, so I never had this problem.

Chip H.


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[Jasen]

Gotcha. I always thought of the "call" as somewhat redundant and stopped using it.

I had made my function a boolean, because I had planned on eventually calling it in the form:

If Not MoveMe(frame1) then
'error handling
End If

I just hadn't implemented that code yet. Maybe that would have taken care of the problem as well?

Thanks for the replies.

 

[strongm]

Yep