GTK+ Error -- Need help

[Lakshmipathi]

I'm getting the error

debian:~/giis-4.6-seprate-files# gtk-builder-convert tab1.glade tab1.xml
Wrote tab1.xml
debian:~/giis-4.6-seprate-files# gcc -Wall -g -o tab1 tab1.c `pkg-config --cflags --libs gtk+-2.0` -export-dynamic

debian:~/giis-4.6-seprate-files# ./tab1 <============ERROR
(tab1:8594): Gtk-CRITICAL **: gtk_widget_show: assertion `GTK_IS_WIDGET (widget)' failed

Below is the source code of c file and .glade file.

Any know what's the issue here?

#include <gtk/gtk.h>
#include <math.h>
#include <stdio.h>
/*
First run :
  gtk-builder-convert tab1.glade tab1.xml
 Then run:
  gcc -Wall -g -o tab1 tab1.c `pkg-config --cflags --libs gtk+-2.0` -export-dynamic
  
Then execute it using:
  ./tab1
*/



#define GUI "gui/tab1.xml"

typedef struct{

        GtkWidget               *main_win; //For main window
	GtkWidget		*btn_viewfiles; // search button
	GtkWidget		*textview_viewfiles;	 //textview _search files

} TAB1;
GtkTextBuffer *buffer; //to store data.


void on_main_win_destroy (GtkObject *object, gpointer user_data);
void on_btn_viewfiles_clicked(GtkButton *button, TAB1 *from_gui);
gboolean build_app (TAB1 *from_gui);


int main (int argc, char *argv[]) {
  
        TAB1      *from_gui;
        from_gui = g_slice_new (TAB1);
        gtk_init (&argc, &argv);

        if (build_app (from_gui) == FALSE) return 1;

        gtk_widget_show (from_gui->main_win);

	g_print("Starting gui\n");

        gtk_main ();

        g_slice_free (TAB1, from_gui);
        
        return 0;
}


gboolean build_app (TAB1 *from_gui){

        GtkBuilder              *builder;
        
        builder = gtk_builder_new ();
        gtk_builder_add_from_file (builder, GUI, NULL);

        from_gui->main_win = 	GTK_WIDGET (gtk_builder_get_object (builder, "main_win"));
        from_gui->btn_viewfiles = 	GTK_WIDGET (gtk_builder_get_object (builder, "btn_viewfiles"));
	from_gui->textview_viewfiles = GTK_WIDGET (gtk_builder_get_object (builder, "textview_viewfiles"));

        gtk_builder_connect_signals (builder, from_gui);
                    
        g_object_unref (G_OBJECT (builder));

        return TRUE;
}


void on_main_win_destroy (GtkObject *object, gpointer user_data){
	gtk_main_quit();
}

void on_btn_viewfiles_clicked(GtkButton *button, TAB1 *from_gui){
g_print("reached  ");
}

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE glade-interface SYSTEM "glade-2.0.dtd">
<!--Generated with glade3 3.4.5 on Wed Jun 10 13:43:45 2009 -->
<glade-interface>
  <widget class="GtkWindow" id="main_win">
    <property name="width_request">300</property>
    <property name="height_request">229</property>
    <property name="title" translatable="yes">View files</property>
    <signal name="destroy" handler="on_main_win_destroy"/>
    <child>
      <widget class="GtkLayout" id="layout1">
        <property name="visible">True</property>
        <child>
          <widget class="GtkButton" id="btn_viewfiles">
            <property name="width_request">75</property>
            <property name="height_request">31</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <property name="label" translatable="yes">Search</property>
            <property name="response_id">0</property>
            <signal name="clicked" handler="on_btn_viewfiles_clicked"/>
          </widget>
          <packing>
            <property name="x">35</property>
            <property name="y">4</property>
          </packing>
        </child>
        <child>
          <widget class="GtkTextView" id="textview_viewfiles">
            <property name="width_request">100</property>
            <property name="height_request">119</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
          </widget>
          <packing>
            <property name="x">194</property>
            <property name="y">49</property>
          </packing>
        </child>
      </widget>
    </child>
  </widget>
</glade-interface>

[Rubberman]

My guess is that something failed in your build_app() function and from_gui->main_win or some sub-component is NULL. Run this in the debugger and see what component is not being initialized properly.

[Lakshmipathi]

Thanks ,Rubberman. I'll try debugging (I need to install debugger) it tonight. I have other simple addition/subtraction/even number GTK+ programs working
I Made some mistake some where with this..

[Rubberman]

Thanks ,Rubberman. I'll try debugging (I need to install debugger) it tonight. I have other simple addition/subtraction/even number GTK+ programs working
I Made some mistake some where with this..

Yeah. When you find it, you will probably whack yourself on the forehead with a Homer - doh!