RE: newbie: on the form of callbacks...

[id072647 belgacom be]

        Hi, 

        All seems ok.

        widget (in callback) will receive button as parameter (by ref) and 
        data will be initialized with "button 1" constant.

        The signal is known -> not necessary to give it and the name of
callback function (callback) is known -> no need to give again.

        Hope this helps.



-----Original Message-----
From: Cevat Ustun [mailto:ustun Glue umd edu]
Sent: Thursday 22 February 2001 06:59
To: gtk-app-devel-list gnome org
Subject: newbie: on the form of callbacks...


Below are two snippets taken from the "Upgraded hello world"
example in the tutorials. My question is:  the function 
"callback" is called with _one_ argument; a pointer to "button 1", 
whereas the callback function itself has _two_ arguments...
What's going on?  


gtk_signal_connect (GTK_OBJECT (button), "clicked",
                    GTK_SIGNAL_FUNC (callback),
                    (gpointer) "button 1");


void callback( GtkWidget *widget,
               gpointer   data )
{
g_print ("Hello again - %s was pressed\n", (char *) data);
}


Thanks for any help, 

Cevat Ustun

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