Call twice a command from DCL crash AutoCAD

[lavekkia]

Hello to everyone,

 

could someone explain me why this piece of code

 

(defun provablk ( / )

(command "_regen")

(command "_regen")

)

 

crash AutoCAD ?!?!?

 

The same code works is called from command line but hangs AutoCAD when called via action_tile; it seems that the command called is not relevant

I have discovered that commenting out the second line but calling twice the function also hangs AutoCAD.

I have defined a custom error handler but it seems to have no effect

 

I have AutoCAD 2012, no service pack

 

Thanks in advance

 

Alessandro Damiani

Edited April 30, 2013 by lavekkia

[lavekkia]

I have found the reason:

 

http://softdraft.info/autolisp/command-function/

 

according to this page, when called inside a dialog box, the (command ".....") is left pending (see the bottom of the page). I ll try to experiment a bit, but i think i have found a solution.

I hope this helps anyone having this problem.

 

Best regards,

Alessandro Damiani

[MSasu]

As you already found, the DCL dialogs were modal, so you cannot use AutoCAD commands that interact with the screen while DCL form is active. For modeless dialogs you may want to take a look to OpenDCL tool. Or, as workaround, hide temporary the DCL form while do the action on screen and restore it right after.