Re: [Plib-users] Problem with setLabel, weirdness ensues.

[Jan R. <slo...@gm...>]

Am Wed, 11 Jun 2008 15:55:57 -0400 schrieb "cory barton" <co...@gm...>:


> void init_pui_widgets( void ) {
> 	//unused variable bbb
> 	char bbb[ PUSTRING_MAX ]; //if I remove this setLabel() fails!
> 	char txt[ PUSTRING_MAX ];
> 	puInit();

Hi,

this won't work, because txt is only allocated on the stack (local
variable), and it will be destroyed at the end of the function.
Introducing bbb cures the problem because it pushes txt further down
on the stack, thus avoiding that it is overwritten by the rest of
your code. If you introduce another function that uses more stack
space, chances are that the above code won't work anymore.

puObject::setLabel() does not copy the string; it just copies the
pointer to the string. Therefore you have to provide a buffer
that doesn't go out of scope as long as your widget exists.

Kind regards,
Jan R.

-- 
Jan Reucker
email: jan dot reucker at web dot de
web:   http://www.reucker-online.de