Re: data passing through callback function

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From: Lawrence bertoldi (lberto++at++md.prestige.net)
Date: 06/01/2001 22:06:43

Angus,

Thanks for the shamless plug!

Angus Dorbie wrote:

> Lawrence, you're for hire?!!
> There's a few folks around who could really use your help.
>
> Cheers,Angus.
>
> Lawrence bertoldi wrote:
> >
> > Try using
> >
> > vgUserData(vgCommon *handle,void *data);
> > and in the method use ........
> > void *mydata = vgGetUserData(vgCommon *handle);
> > now cast it to what ever type it is suposed to be!!
> >
> > See Ya ~;-}>
> > lawrence bertoldi Graphics Software Engineer (for hire)
> > 410.781.7286 lberto++at++md.prestige.net
> >
> > Changhee Han wrote:
> >
> > > Hello all,
> > > I want to know how to pass data to callback function, or to get value of
> > > global variable from inside callback function.
> > > I tried both
> > > (1)
> > > vgAddFunc( chan, VGCHAN_POSTDRAW, my_draw_callback, (void*)data_fd ); //this
> > > function is now defined after vgConfigSys().
> > > and
> > > (2)
> > > pfInit();
> > > pfInitArenas();
> > > new_fd_pt = (int *) pfMalloc(sizeof(int), pfGetSharedArena());;
> > > .....
> > > my_draw_callback(....){
> > > ......
> > > printf(......new_fd_pt);
> > > .......
> > > }
> > >
> > > But,
> > > by(1), I got worng value.
> > > by(2), I got below messages and wrong value
> > > PF Warning/Usage: pfGetSharedArena() Must call pfInit or
> > > pfInitArenas first.
> > > => warn pfInit() Already initialized. Must call pfExit() before
> > > reinitialization.
> > >
> > > PLEASE help me,
> > > Thanks in advance,
> > > changhee
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