[Plib-users] RE: Crash while deleting puDialogBox... access violation

[McEvoy, N. <nic...@ds...>]

Ralf Pietersz wrote:
>I have a strange crash I dont really understand...
>If there is anyone that has experienced something similar and knows a
>solution please speak up. :)
>Basicly, I create a dialogbox, and close it when the callback for the
>button inside it is called.
>Once it closes I get a crash, access violation.
>Traceback:
>puOneShot::doHit(int 0, int 1, int 243, int 34) line 33 + 12 bytes
>puObject::checkHit(int 0, int 1, int 243, int 34) line 508 + 29 bytes
>puGroup::checkHit(int 0, int 1, int 243, int 34) line 212 + 29 bytes
>puMouse(int 0, int 1, int 394, int 316) line 378 + 42 bytes
>mouse(int 0, int 1, int 394, int 316) line 1004 + 21 bytes
>FREEGLUT! 0089661d()
<snip>

I've only just started using the pui ... so I'm no expert
(although I've been using plib for years) ... but I do remember
I had a similar problem as you describe.

What I found was that the puMouse(button, state, x, y) callback
was arriving after dialog was deleted !?

I'm not sure if it was a timing issue in my code, or a bug in the
pui ... where maybe it doesn't correctly check if the dialog exists
when checking hits (if I remember correctly it seemed to happen on
the mouse up event).

In my case *maybe* it was a timing issue (but I'm not convinced yet)
... I changed my code as follows to delete the dialog after an
intensive load operation (and a redraw ... maybe the redraw is the
solution ... I'm just guessing here):

on mouse down:
- closed & deleted dialog
- loaded level (+ redraw)
- crash occurred (similar to your description)

on mouse down:
- hide dialog
- loaded level (+ redraw)
- deleted dialog
- no problems

Sorry I can't be more helpful than that.  Let us know what you find.

>Do I need to tell PUI I am deleting that dialogbox AND the buttons
>inside it??
>Clean something up? Pop some interface from the stack??

No, I don't think so.

Nick