COMBOBOX IN WINDOWS 2000

[Daniel Buttigieg]

Hi,

I have a very small app with a combobox that works perfect in windows 95 and 98 however, in windows 2000, the combobox disappears - simply non existant. Has anyone ever encountered this ?
Thanks in advance,

Daniel


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[Lance Edmonds]

Do you mean the whole box, or the drop-down portion? The specified height of a combo box should include the drop-down, so if you set the height for, say, 14 dialog units, there is no room within that for the drop-down to appear correctly.

If this does not help, please describe the problem more acurately or post the code to demonstrate the problem... lots of us are using Win2K here.

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Lance
PowerBASIC Support
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[Borje Hagsten]

NT systems like Win2K are less forgiving than Win95/98. Usually, something
in code is wrong, but Win95/98 just ignores this, where NT complains. People
say NT is better that way, but I don't know.. Real problem is that different
NT systems / service packs complains on different things.

Look for errors in API calls, if any. PB's own syntax is well tested and (almost)
never causes any problems. For me, in 100% of the cases where things have failed
in NT but worked in Win95/98, I've done something wrong with some API call..


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[Michael Mattias]

As Mr Hagsten says, W2K is less forgiving.

I had a similar problem. Turns out I created (rather, tried to create) a child window with an invalid combination of style bits (%WS_xxx and %WS_EX_xxx). On 9x the extra bits were ignored, on W2K CreateWindowEx failed and the control was not created.

So, I'd check the style bits on your combobox; be that resource file, parameter to CreateWindow[Ex] or CONTROL ADD.

MCM




[This message has been edited by Michael Mattias (edited September 18, 2001).]

[Daniel Buttigieg]

Thankyou so much for your quick replies guys!

However, I can't figure out what is going wrong

The control used to add a combobox is pretty easy and straightforward. This is what I am using in my program:

~~~~~~~~~~~~~~~~~~~~~

CONTROL ADD LABEL, hDlgalignbarcodes, 030,"Section", 15, 209, 120, 12, %SS_left

CONTROL ADD COMBOBOX, hDlgalignbarcodes, 031, , 85, 210, 65, 50,,%CBS_DROPDOWN OR %WS_VSCROLL OR %WS_TABSTOP

FOR h& = 1 TO DATACOUNT
COMBOBOX ADD hDlgalignbarcodes, 31, READ$(h&)
NEXT

DATA "Avery9999","Shelf Labels"
~~~~~~~~~~~~~~~~~~~~~

Thanks in advance
Daniel


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[Semen Matusovski]

50,,%CBS_DROPDOWN Should be one one comma only.



[This message has been edited by Semen Matusovski (edited September 18, 2001).]

[Daniel Buttigieg]

Thanks for your reply !

I shall try it tomorrow morning because I am not on my dev. Pc and tell you how things went.

Daniel

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[Daniel Buttigieg]

thank you SO MUCH Lance, Borje, Michael and Semen. I was not aware of this however this certainly did the trick for me!! Thanks once again. Best Regards, Daniel

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[Semen Matusovski]

Trick ? It's simply correct variant.
From Pb/Dll help:

CONTROL ADD COMBOBOX, hDlg&, id&, [items$()], x, y, xx, yy, [, style&[, exstyle&]] [CALL callbackfunction]

style& Style of the control.  This value can be a combination of any values below:
%CBS_DROPDOWN ...

exstyle&   Extended style of the control.  This value can be a combination of any values below: ...

Because you used two commas, compiler interpretates %CBS_DROPDOWN in your variant as exstyle.
Meanwhile exstyle and style are two different animals.

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[Lance Edmonds]

Er... Semen, you posted the syntax definition, but with 2 comma's too!

The correct syntax should be shown as:

CONTROL ADD COMBOBOX, hDlg&, id&, [items$()], x, y, xx, yy [, [style&] 
    [, [exstyle&]]] [[,] CALL callbackfunc]

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Lance
PowerBASIC Support
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[Semen Matusovski]

Lance --
Actually I simply copied from "Help" and didn't read.
Now is clear a reason of Daniel's mistake.

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