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Why does my usercontrol not resize to fill the form with Visual Basic 6 ?

Posted on 2006-06-09
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Last Modified: 2010-04-30
Adding the following code to Standard EXE project with one User Control I find that the control does not fill the entire form like I'd expect.  How do I fix this?

Private Sub Form_Resize()
   BackColor = 255 'change background color so that the user control can be seen
   UserControl11.Move 0, 0, ScaleWidth, ScaleHeight
End Sub
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Question by:Spedley
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16870769
Private Sub Form_Resize()
   BackColor = 255 'change background color so that the user control can be seen
   UserControl11.Move ScaleLeft, ScaleTop, ScaleWidth, ScaleHeight
   doevents
End Sub
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Author Comment

by:Spedley
ID: 16872761
Unfortunately that doesn't change anything.

If I use Debug.Print Width in the user control it reports a different value to the Form using Debug.Print UserControl11.Width with the UserControl value being approx' 95% of the Form value.  I say approx' because it does vary slightly and the difference between the two also varies.
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Author Comment

by:Spedley
ID: 16872870
I've changed the code to include printing widths ...

In the Form:
Private Sub Form_Resize()
   BackColor = 255
   UserControl11.Move ScaleLeft, ScaleTop, ScaleWidth, ScaleHeight
   Caption = UserControl11.Width
End Sub

In the UserControl:
Private Sub UserControl_Paint()
   Cls
   Print Width
End Sub

Here is a link to a screen shot in case there is somethin I'm missing
http://www.cv32.com/cv32/VB6/Project1.GIF

Here is a link to the compiled program so you can see for yourself (if you trust me)
http://www.cv32.com/cv32/VB6/Project1.exe
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16873259
I couldn't see the usercontrol, but the 2 sizes in the caption and the printed value where always identical for me.
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Author Comment

by:Spedley
ID: 16873510
Thanks for that.  That means the problem must be my computer somehow?

This is what I get
http://www.cv32.com/cv32/VB6/Form1.GIF
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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16873642
is your windows configured to allow redrawing the form contents while resizing. I think that is what makes it not working, but i'm not sure.
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Author Comment

by:Spedley
ID: 16876887
It seems to be caused by having a different dpi setting in Windows (mine is currently set to 110% or 106pts instead of 96pts).  If I change it back to 100% and reboot the problem goes.
I can't believe no-one has come accross this before ??

Now I know what the problem is, the refined question is: Does anyone know how to make VB6 adjust to the current dpi settings?
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Accepted Solution

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Guy Hengel [angelIII / a3] earned 50 total points
ID: 16877532
please check out to multiply the ScaleWidth/scaleHeight by the Screen.TwipsPerPixelY/Screen.TwipsPerPixelY value.
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