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POHow to get avoid assertion failure when loading gtk About dialog box?
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  1. POHow to get avoid assertion failure when loading gtk About dialog box?
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    copied!<p>I've programmed a software gui using glade and gtk. The main window has an <strong>About</strong> button. When I click on the button for the first time, the <strong>GtkAboutDialogBox</strong> runs perfectly. The action area is correctly bound to the events. But when I close it and tries again to open the about dialog (<strong>without quiting from the main window</strong>), nothing comes up. And additionally the system thows</p> <pre><code>(tut:5424): GLib-GObject-WARNING **: invalid unclassed pointer in cast to `GtkDialog' (tut:5424): Gtk-CRITICAL **: IA__gtk_dialog_run: assertion `GTK_IS_DIALOG (dialog)' failed (tut:5424): GLib-GObject-WARNING **: invalid unclassed pointer in cast to `GtkWidget' (tut:5424): Gtk-CRITICAL **: IA__gtk_widget_destroy: assertion `GTK_IS_WIDGET (widget)' failed </code></pre> <p>to the shell. What could be wrong with this code?</p> <pre><code>//tut.c //gcc -o tut tut.c $(pkg-config --cflags --libs gtk+-2.0 gmodule-2.0) #include &lt;gtk/gtk.h&gt; GtkBuilder *builder; GtkWidget *window,*window_cnb; GtkAboutDialog *abtwindow; GtkLabel *label; GError *error = NULL; void on_about_clicked() { gtk_dialog_run( GTK_DIALOG(abtwindow) ); gtk_widget_destroy( GTK_WIDGET(abtwindow) ); } int main( int argc,char **argv ) { gtk_init( &amp;argc, &amp;argv ); builder = gtk_builder_new(); if( ! gtk_builder_add_from_file( builder, "my.glade", &amp;error ) ) { g_warning( "%s", error-&gt;message ); g_free( error ); return( 1 ); } window = GTK_WIDGET( gtk_builder_get_object( builder, "window1" ) ); abtwindow = GTK_ABOUT_DIALOG( gtk_builder_get_object( builder, "aboutdialog1" ) ); label = GTK_LABEL( gtk_builder_get_object( builder, "label16" ) ); gtk_builder_connect_signals( builder, NULL ); g_object_unref( G_OBJECT( builder ) ); gtk_widget_show( window ); gtk_main(); return( 0 ); } </code></pre> <p>I use gtkbuilder. How can I fix it?</p>
 

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