Re: Problem sending data to gtk_button on "clicked" event

["Alan M. Evans" <ame1 extratech com>]

On Wed, 2005-11-09 at 08:39, Evan Behar wrote:
> I've been getting seg-faults when I try to work with data in my button
> "clicked" callback functions, so as a test, I compiled and ran the
> following program:
>
> #include <gtk/gtk.h>
>
> gchar m1[] = "button 1";
> gchar m2[] = "button 2";
>
> static void callback(GtkWidget* widget, GdkEvent *event, gpointer data) {
>   g_print ("Hello again - %08X was pressed\n", data);
> }

Your problem is that the marshaller for button clicked events only
passes two parameters. Try:

  static void callback(GtkWidget *widget, gpointer data);

> static gboolean delete_event( GtkWidget *widget, GdkEvent *event, gpointer data) {
>   g_print ("Check it - %08X was pressed\n", data);
>   gtk_main_quit();
>   return TRUE;
> }
>
> int main(int argc, char* argv[]) {
>   GtkWidget *window;
>   GtkWidget *button;
>   GtkWidget *box1;
>   
>   printf("m1: %08X\n",m1);
>   printf("m2: %08X\n",m2);
>   printf("(gpointer)m1: %08X\n",(gpointer)m1);
>   printf("(gpointer)m2: %08X\n",(gpointer)m2);
>     
>   gtk_init(&argc,&argv);
>   
>   window = gtk_window_new(GTK_WINDOW_TOPLEVEL);  
>   g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(delete_event),(gpointer)m1);
>    
>   box1 = gtk_hbox_new(FALSE,0);  
>   gtk_container_add(GTK_CONTAINER(window),box1);
>   
>   button = gtk_button_new_with_label("Button 1"); 
>   g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(callback),(gpointer)m1);  
>   gtk_box_pack_start(GTK_BOX(box1),button,TRUE,TRUE,0);  
>
>   gtk_widget_show(button);
>   
>   button = gtk_button_new_with_label("Button 2");  
>   g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(callback),(gpointer)m2);  
>   gtk_box_pack_start(GTK_BOX(box1),button,TRUE,TRUE,0);  
>
>   gtk_widget_show(button);  
>   gtk_widget_show(box1);  
>   gtk_widget_show(window);
>   
>   gtk_main();
>   
>   return 0;
> }
>
> I ran this program, and clicked on Button 1, then Button 2, and then the close button.
>
> My program output was:
>
> m1: 080491EC
> m2: 080491F5
> (gpointer)m1: 080491EC
> (gpointer)m2: 080491F5
> Hello again - 00000002 was pressed
> Hello again - 00000002 was pressed
> Check it - 080491EC was pressed
>
> Naturally, if I use %s to try and output the data from the button callback functions, it seg faults.
>
> What am I doing wrong?  Is there something else I need to do to be able to send data on a "clicked" event?
>
> _______________________________________________
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-- 
Alan M. Evans <ame1 extratech com>