Re: [paragui-users] Set/Get UserData from a widget

[Eric Ross]

On Tue, 6 Aug 2002, Andrew Ford wrote:

> Did you run it under the debugger to check exactly
> what's going on?  I don't even know what these
> functions are supposed to be used for :)
> 
> --- Keith Swyer <address@hidden> wrote:
> > hey, just wondering if anyone has used the
> > SetUserData or GetUserData
> > members of PG_Widget. I keep getting access
> > violations when trying to get
> > the userdata, being a PG_Rect*.
> > 
> > This may not make much sense, but...
> > 
> > //temp is a PG_Button
> > temp->SetUserData((void*)temp->GetClipRect(),
> > sizeof(PG_Rect*));
> > 
> > PG_Rect *temp;
> > if (itr->second->GetUserDataSize())
> >            itr->second->GetUserData((void*)temp);   
> > //access violation here

Well.. according to the comments in the code, GetUserData must be 
called with pre allocated space to copy the data into the buffer.

I think that could be useful to have some functions to set/get data, but 
without the copy. I think something like gtk:

void SetUserData(const string& key, void *data);
void *GetUserData(const string& key);

All indexed by some arbitrary string.

What do you think ? It seems pretty easy to implement.. any volunteer ?  :)

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