[Glade-users] C Beginner question

[Micah Carrick]

Did you specify "ssh_user_entry" as the user_data for the "clicked" 
event of the button in the glade file? Otherwise, you might want to use 
glade_xml_signal_connect instead of autoconnect so you can specify the 
user data. Sometimes if you have custom user data, you use 
glade_xml_signal_connect_data for your connections instead.

void on_connect_btn_clicked(GtkButton *button, GtkWidget
*ssh_user_entry)
{
    const gchar *ssh_user_text;
     ssh_user_text = gtk_entry_get_text (GTK_ENTRY (ssh_user_entry));
    printf ("Entry contents: %s\n", ssh_user_text);
}

int main (int argc, char *argv[])
{
    GladeXML *xml;    /* glade xml file */
    GtkWidget *entry;
   
    gtk_init (&argc, &argv);
    xml = glade_xml_new (GLADE_FILE, NULL, NULL);   
   
    /* get a reference to the entry widget */
    entry = glade_xml_get_widget (xml, "ssh_user_entry");
   
    /*
    assumes "on_connect_btn_clicked" is the handler name specified in glade
    and passes the entry widget as user data.
    */
   
    glade_xml_signal_connect_data (xml,
                                   "on_connect_btn_clicked",
                                   G_CALLBACK (on_connect_btn_clicked),
                                   entry);
                                  
    /*
    unlike PHP, you're responsible for freeing memory with C
    Below we are unreferencing the xml object in memory now that we've built
    the UI and obtained references to the widgets we need.
    */
   
    g_object_unref (xml);
   
    gtk_main();

    return 0;
}


- Micah Carrick

  Developer - http://www.micahcarrick.com
  GTK+ Forums - http://www.gtkforums.com



Lupine wrote:
> Hello list and happy holidays!
>
> I'm not new to Glade, but I am new to C...well sort of.  I've played
> with C for a while, but I'm stronger in scripting languages like PHP,
> Perl...etc.  However, I wanted to do a comparison of sorts, so I'm
> porting one of my PHP-GTK/Glade apps over to C.  In doing so, I'm
> finding the lack of documentation frustrating (simply because I don't
> understand C that well). Can anybody point me to some good
> documentation, besides the Gtk documentation?
>
> For example, I know that I can go here:
> http://www.gtk.org/tutorial/x941.html to see the Gtk way of getting the
> text entered into a GtkEntry.  However, how do I do it if I'm using
> Glade.  I mean, the autoconnect should already know/create my widget, so
> how do I simply call to the entry?  
>
> My GtkEntry widget is called "ssh_user_entry", and my GtkButton is
> called "connect_btn", so I would assume the C/Glade way would be:
>
> void on_connect_btn_clicked(GtkButton *button, GtkWidget
> *ssh_user_entry)
> {
> 	const gchar *ssh_user_text;
>  	ssh_user_text = gtk_entry_get_text (GTK_ENTRY (ssh_user_entry));
> 	printf ("Entry contents: %s\n", ssh_user_text);
> }
>
> int main (int argc, char *argv[])
> {
> 	GladeXML *xml;	/* glade xml file */
> 	gtk_init(&argc, &argv);
> 	xml = glade_xml_new(GLADE_FILE, NULL, NULL);	
> 	glade_xml_signal_autoconnect(xml); /* connect signal handlers */
> 	gtk_main();
>
> 	return 0;
> }
>
> However, this is not working.  I keep getting the following error when
> clicking the button:
>
> Gtk-CRITICAL **: gtk_entry_get_text: assertion `GTK_IS_ENTRY (entry)'
> failed
> Entry contents: (null)
>
>
> In PHP-GTK it is MUCH easier, as all I had to do was:
> class phpConnMgr extends GtkWindow
> {
> 	function __construct()
> 	{
> 		$gladefile = $GLOBALS['gladefile'];
> 		parent::__construct();
> 		$this->glade = new GladeXML(dirname(__FILE__) . $gladefile);
> 		$this->glade->signal_autoconnect_instance($this);
> 	}
>
> 	function on_connect_btn_clicked()
> 	{
> 		$user = $this->glade->get_widget("ssh_user_entry")->get_text();
> 		echo "$user\n";
> 	}
> }
> $phpConnMgr = new phpConnMgr();
> Gtk::main();
>
>
>
> If you can let me know the proper way to do this in C/Glade, and/or let
> me know where some simple examples of these common tasks are documented,
> I'd really appreciate it!
>
> Thanks,
> -Lup
>
>
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