OpenEuphoria

Re: Getting Combo Box Drop Down Button hWnd?

• Posted by Al Getz <Xaxo at aol.com> Jun 11, 2005
• 566 views

Larry Miller wrote:
> 
> I have been following the ongoing coversation between Al and Derek with
> interest. I would like to add that there is a potential problem with setting
> the GWL_USERDATA field on some controls. With the large marjority of controls,
> all those currently supported by WIn32Lib, there is no problem. But setting 
> this field on an IP Address control, "SysIPAddress32" class, has caused a
> very serious problem for me. After this field has been set any reference to
> the control prior to the main window opening causes a machine exception. 
> Otherwise an error is generated on startup. Also, the SetWindowLong funtion
> does
> not return 0 when this is done. The only window styles specified are WS_CHILD 
> and WS_VISIBLE. If the function is removed the control opens and functions 
> normally. I have noticed this only with this control type. 
> This is on Windows 2000 with SP4 and IE6.
> 
> It appears that this control is using the GWL_USERDATA field for it's own use.
>
> Is it possible that I am doing something wrong, or is this not an entirely 
> legitimate thing to do? MSDN does not specifically mention it's use with 
> controls, only with windows.
> 
> Larry Miller
> 

Hi there,

Very interesting Larry!  Why dont you try GetWindowLong() before you
set that value and see what it returns?  Report back here and we can
discuss it.


Take care,
Al

And, good luck with your Euphoria programming!

My bumper sticker: "I brake for LED's"