GTK newbie help on G_CALLBACK

RudraB · 05-06-2012, 01:48 AM

Dear Friends,
I have taken a project (my own, not homework) to develop a table. I generally work with fortran, dont know C that much.
What I want is a gtk clist to pop up when I press a button, via callback. The button widget in my code is

Code:

 /* Create first button */
    button = gtk_button_new_with_label ("B1");

    /* When the button is clicked, we call the "callback" function
     * with a pointer to "button 1" as its argument */
    g_signal_connect (button, "clicked",
                  G_CALLBACK (callback), (gpointer) "B1");


    /* Insert button 1 into the upper left quadrant of the table */
    gtk_table_attach_defaults (GTK_TABLE (table), button, 0, 1, 0, 1);

    gtk_widget_show (button);

The definations are mostly based on http://developer.gnome.org/gtk-tutorial/2.24/x344.html

What I want to do is callback to execute another gtk file, rather than what shown in the example

Code:

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

Can you please show me how I can get this?

KenJackson · 05-08-2012, 05:34 AM

I'm not sure I understand. It sounds like you want to pass a function pointer when that function is in a different file. If that's what you want, you need to put a prototype for the function in the first file, or better, in a header file that's included in both source files.

There's also another detail. Anything that's declared static can't be referenced from another file.

I'm not familiar with GTK programming, but assuming you have the types and strategy right, try removing the keyword static and adding this prototype line:

Code:

void callback(GtkWidget *widget, gpointer data);