Visual LISP, AutoLISP and General Customization

Posts: 11
Registered: ‎01-23-2004
Message 1 of 3 (117 Views)

VB6 form in AutoCAD 2005 inaccessible when SDI=0 and TASKBAR=1

117 Views, 2 Replies
07-06-2006 08:20 AM
Hello, all.
I am having a problem showing a VB6 form modally in AutoCAD 2005, when SDI=0, TASKBAR=1 and there are multiple drawings open. The problem is that the form does not display on the screen: it flashes briefly, then AutoCAD will not respond. If AutoCAD is the only program running, the user can use Alt+Tab to cycle through the AutoCAD windows until he/she reaches the VB6 form. However, if any other program is running, Alt+Tab does not cycle through the AutoCAD windows, so AutoCAD appears to remain locked up. The only way I have found to fix this is for the user to close all other programs, then use Alt+Tab.

I have tried to check the value of the system variable TASKBAR, but AutoLISP getvar returns nil, and VBA GetVariable produces an "Error getting system variable" error.

Does anyone know of a good solution for this? Any help will be appreciated.
Stephanie Chesser
Distinguished Contributor
Posts: 285
Registered: ‎01-08-2004
Message 2 of 3 (117 Views)

Re: VB6 form in AutoCAD 2005 inaccessible when SDI=0 and TASKBAR=1

07-07-2006 12:29 AM in reply to: schesser
Stephanie -

You can get the Taskbar value from ...FixedProfile\General\Taskbar in the registry:

(defun f:taskbar ()
(strcat "HKEY_CURRENT_USER\\" (vlax-product-key) "\\FixedProfile\\General")

- the value in the registry seems to update when using the taskbar command only on exiting the application. (Acad2006 on XP Professional)

Unfortunately, I don't have a clue how to deal with the form display problem (bug?) - but I do use a number of vb6 forms in my functions so I guess I'll force the program to taskbar = 0 mode before calling the form. You can set the taskbar value with the command - i.e. (command "_.taskbar" 0).

I hope that some of the more advanced vb programmers on this forum will be able to come up with a more satisfactory solution.

-see also ng topic:


Posts: 11
Registered: ‎01-23-2004
Message 3 of 3 (117 Views)

Re: VB6 form in AutoCAD 2005 inaccessible when SDI=0 and TASKBAR=1

07-10-2006 11:57 AM in reply to: schesser
Hi, Peter
Thanks for the info. I am now using your f:taskbar function to check the value of the TASKBAR system variable, then using command to set its value. Initial testing looks like this will work most of the time. (Once, I still had the problem, even though I could see in the command line that TASKBAR had been set to 0.) I am hoping it will work consistently.

Using SetWindowPos as suggested in the other topic actually had an adverse effect: the form did not appear and I could not use Alt+Tab to bring it into focus!

Thanks again, and any further suggestions would be appreciated.

Stephanie Chesser

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