RE: [Plib-users] pui help

[Clay, B. <bc...@ba...>]

Brian:
  I had to go back to my deleted mail to check this.  In one of your
later mails you said that backButton is global but you are redefining it
in:

void createTeamButtons() {
    puOneShot *backButton =3D new puOneShot (20.0, 20.0, 170.0, 50.0);
...


You may want to double check that

Bruce

-----Original Message-----
From: pli...@li...
[mailto:pli...@li...] On Behalf Of Brian Smith
Sent: Tuesday, April 06, 2004 10:20 PM
To: pli...@li...
Subject: Re: [Plib-users] pui help




>Brian Smith wrote:
>>Running VC++6.0 with windows XP, plib 1.8.2, I was wondering if anyone
>>could help me out,  I need to hide puObjects but whenever I use
.hide()=20
>>the program crashes and I get an unhandled exception:  access
violation. =20
>>Any suggestions?? thanks in advance.
>
>Well, I've used hide() quite a bit with no problems - we're going to=20
>need a LOT more information if this is truly a PLIB bug.
>
>It crashes inside hide() ?
>
>If so, it *MUST* be that the puObject you are calling it on is an=20
>invalid pointer...all hide() does is access an internal member and call

>puPostRefresh - and all THAT does is set a global.
>
>However, if calling hide() causes it to die sometime later then we=20
>could be looking at something complicated.
>
>Could you get us a stack back-trace from the crash?   Or maybe
>show us some source code?
>

I'll try and explain what the program is doind and show ya the relevant=20
source.  I have two display functions, the first one has no pui objects
at=20
all but when i switch to the second display function there are some
buttons=20
on it, one of the buttons I have is a back button which returns to the
first=20
display function.

so when the second display function is eventually called I call the
function=20
createTeamButtons() which is this:

void createTeamButtons() {
    puOneShot *backButton =3D new puOneShot (20.0, 20.0, 170.0, 50.0);
    backButton->setLegend("Back");
    backButton->setCallback(backButtonCallback);
}

the callback function for this button (backButtonCallback) is this:

void backButtonCallback(puObject *) {
    glutKeyboardFunc(NULL);
    glutSpecialFunc(NULL);
    glutIdleFunc(Main_Display);
    glutDisplayFunc(Main_Display);
    glutPassiveMotionFunc(Main_MouseMove);
    glutMouseFunc(Main_MouseChoose);
    hideTeamButtons();
}

and hide TeamButtons() is this:

void hideTeamButtons() {
    backButton->hide();
}

so in the program when I click the back button the program crashes and
an=20
error dialog pops up saying:

Unhandled exception in program.exe: 0xC0000005:  Access Violation.

I say it crashes on hide because:  1)when I debug it is calling the hide

function in pu.h while crash
                                              2)if hide() isn't in=20
hideTeamButtons()  (I was gonna try just
                                                 deleting everything=20
everytime the program returns to the first
                                                 display function but=20
figured hide would be much easier)

there are more buttons for the second display function but this is the
most=20
relevent one, if I try hide one or hide them all doesn't matter so only
put=20
the one in.  Thats all i got for ya, if theres anything else ya want let
me=20
know.

-Brian

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