Re: data in g_signal_connect

Olexiy Avramchenko <olexiy@xxxxxxxxxxxx> · Thu, 13 Nov 2003 18:32:59 +0200

olafandjasper@xxxxxxxxxxxx wrote:

=========================================================
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);
}

This is completely broken, prototype should be:

gboolean selectActionBin(GtkWidget *button, GdkEventButton *event, 
struct MY_DATA *data);

(marking this as ''static" is not a bad idea too).

1. Return value of this callback should be gboolean (TRUE means that 
this event is handled and no other callbacks will be executed).

2. You will get a pointer to GdkEventButton structure instead of pointer 
to MY_DATA.

Look at:

http://developer.gnome.org/doc/API/2.0/gtk/GtkWidget.html#GtkWidget-button-press-event

 g_signal_connect(G_OBJECT (butWidget),

                  "button_press_event",

                  G_CALLBACK (selectActionBin),

                  &mydata);

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