[Glade-users] Re: data in g_signal_connect

[olafandjasper hushmail com (olafandjasper hushmail com)]

Thank you all very much...Both of your posts helped... John I un-globalized
and Olexiy used the correct API/proto.
O

On Thu, 13 Nov 2003 08:31:23 -0800 John Cupitt <john cupitt ng-london org uk>
wrote:
> Hi, you're creating an instance of MY_DATA in the header file, then
> including that header in two places. So you're getting two versions
> of MY_DATA. You should never make variables in headers, only declare
> that they exist elsewhere (with an extern).
>
> Remove the line "struct MY_DATA mydata;" from the header, and remove
> the "extern" from the declaration in SQLstuff.c.
>
> In any case, it's probably not wise to use globals like this. It's
> better to g_new( MY_DATA ) to allocate a new one off the heap, and
> then make sure you g_free() it somewhere sensible.
>
> HTH,
>
> John
>
> olafandjasper hushmail com wrote:
> > Hello again:
> > This is a follow-up of a previous thread I started in early Nov.
> > I appreciate the help I got from the list, but I am still having
> difficulty.
> > Someone suggested I use a different prototype, but I got the same
> (wrong)results:
> >    void slectActionBin (GtkWidget     *widget,
> >                         GdkEvenButton *event,
> >                         MY_DATA       *data)
> >
> > The problem is the data is not being printed out in the callback
> routine.
> > You can see, at the bottom of this post, that there is
> > nothing in data and the address is diff :(
> >
> > Can someone help get my data so it is visable/correct in the called
> cb
> > routine.
> > I think (maybe) I am not casting it properly or something, but
> when I
> > called the callback routine directly (commented out the g_connect_signal)
> > the data was correct....hmmmm
> >
> > Here is the code that does not work:
> > =========================================================
> > mySupport.h:
> > struct MY_DATA {
> >    char bin[1000];
> >    char doc[1000];
> > };
> >                                                              
>      
> >            
> > struct MY_DATA mydata;
> >
> > =========================================================
> > mySupport.c:
> > void selectActionBin(GtkWidget      *button,
> >                      struct MY_DATA *data)
> > {
> >   /* This is the code that does not work */
> >   printf("In call back, data = <%s>\n",data->bin);
> >   printf("In call back, data = <%s>\n",data->doc);
> >   printf("In call back, data is at %p\n", data);
> >   printf("In call back, &data is at %p\n", &data);
> > }
> > =========================================================
> > SQLstuff.c:
> > -- This is where I set up my callback/data 
> > extern struct MY_DATA mydata;
> > int doQuery(char *sqlStr)
> > {
> >   strcpy(mydata.bin,"Test data");
> >   strcpy(mydata.doc,"Test data");
> >   printf("Data is <%s> before callback\n",mydata.bin);
> >   printf("Data is <%s> before callback\n", mydata.doc);
> >   printf("Data is at %p before callback\n", mydata);
> >   printf(" &data is at %p before callback\n", &mydata);
> >   g_signal_connect(G_OBJECT (butWidget),
> >                    "button_press_event",
> >                    G_CALLBACK (selectActionBin),
> >                    &mydata);
> > }
> > =========================================================
> > output: (as you can see the callback is called but nothing is
> >          in the data and the address are diff) :(
> >
> > Data is <Test data> before callback
> > Data is <Test data> before callback
> > Data is at 0x74736554 before callback
> > &data is at 0x80513a0 before callback
> >
> > In call back, data = <>
> > In call back, data = <>
> > In call back, data is at 0x8a3e6e0
> > In call back, &data is at 0xbfffd944
> >
> >
> > Thanks,
> > O
> >
> >
> >
> >
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