c - How to get avoid assertion failure when loading gtk About dialog box? -


i've programmed software gui using glade , gtk. main window has about button. when click on button first time, gtkaboutdialogbox runs perfectly. action area correctly bound events. when close , tries again open dialog (without quiting main window), nothing comes up. , additionally system thows

(tut:5424): glib-gobject-warning **: invalid unclassed pointer in cast `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 `gtkwidget' (tut:5424): gtk-critical **: ia__gtk_widget_destroy: assertion `gtk_is_widget (widget)' failed

to shell. wrong code?

//tut.c //gcc -o tut tut.c $(pkg-config --cflags --libs gtk+-2.0 gmodule-2.0) #include <gtk/gtk.h>  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( &argc, &argv );     builder = gtk_builder_new();     if( ! gtk_builder_add_from_file( builder, "my.glade", &error ) )  {         g_warning( "%s", error->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 ); }

i use gtkbuilder. how can fix it?

use gtk_widget_hide() instead of gtk_widget_destroy().


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