Solved - Re: My unstable treeview test application

[kadil <ksadil bigpond com>]

I have identified the cause of my own programs instability. I am not
sure if this rates as a bug, or my lack of understanding, but by
declaring a global GtkTreeSelection pointer, the compiled application
segfaults. Any ideas if this is a sensible consequence or not?

Regards,
Kim


On Sat, 2003-09-06 at 22:27, kadil wrote:
> Hi,
> 
> I have read about all that I can find on the subject of gtktreeviews. So
> I tried to apply the code snippets with a gui using glade to build it.
> On my laptop - Mandrake 9.1, it works - sort of, but it segfaults very
> quickly. On this desktop, also mandrake9.1, immediate segfault. I
> suspect it is a signal problem. Anyhow here's the code. The app is a
> form with a button to set things up, a treeview widget and a button
> below to add a row. Any assistance would be greatly appreciated.
> 
> Thanks,
> Kim
> 
> callbacks.c:
> 
> 
> #ifdef HAVE_CONFIG_H
> #  include <config.h>
> #endif
> 
> #include <gtk/gtk.h>
> 
> #include "callbacks.h"
> #include "interface.h"
> #include "support.h"
> 
>     GtkTreeStore *store;
>     GtkWidget *tree,*sw,*w1;
>     GtkTreeViewColumn *column;
>     GtkCellRenderer *renderer;
>     GtkTreeIter *iter;
>     GtkTreeSelection *select;
> 
> enum
> {
> TITLE_COLUMN,
> AUTHOR_COLUMN,
> CHECKED_COLUMN,
> N_COLUMNS
> };
> 
> 
> static void tree_selection_changed_cb(GtkTreeSelection
> *selection,gpointer data)
> {
>     GtkTreeIter iter1;
>     GtkTreeModel *model1;
>     gchar *author;
>     if(gtk_tree_selection_get_selected(selection,&model1,&iter1))
>     {
> 	gtk_tree_model_get(model1,&iter1,AUTHOR_COLUMN,&author,-1);
> 	g_print("you selected a book by %s \n",author);
> 	g_free(author);
>     }
> }
> 
> void
> on_button1_clicked                     (GtkButton       *button,
>                                         gpointer         user_data)
> {
>     
>     //create a model
>    
> store=gtk_tree_store_new(N_COLUMNS,G_TYPE_STRING,G_TYPE_STRING,G_TYPE_BOOLEAN);
>     //fill the model
>     //populate_tree_model(store);
>     gtk_tree_store_append(store,&iter,NULL);
>     gtk_tree_store_set(store,&iter,TITLE_COLUMN,"The art of
> programming",AUTHOR_COLUMN,"ME",CHECKED_COLUMN,FALSE,-1);    
>     
>     //create a view
>     tree=gtk_tree_view_new_with_model(GTK_TREE_MODEL(store));
>     
>     //get rid of our own reference to store
>     g_object_unref(G_OBJECT(store));
>     
>     //create a cell renderers and columns
>     renderer=gtk_cell_renderer_text_new();
>     g_object_set(G_OBJECT(renderer),"foreground","red",NULL);
>    
> column=gtk_tree_view_column_new_with_attributes("Author",renderer,"text",AUTHOR_COLUMN,NULL);
>     gtk_tree_view_append_column(GTK_TREE_VIEW(tree),column);
>     renderer=gtk_cell_renderer_text_new();
>    
> column=gtk_tree_view_column_new_with_attributes("Title",renderer,"text",TITLE_COLUMN,NULL);
>     gtk_tree_view_append_column(GTK_TREE_VIEW(tree),column);
>     renderer=gtk_cell_renderer_toggle_new();
>     column=gtk_tree_view_column_new_with_attributes("Checked
> out",renderer,"active",CHECKED_COLUMN,NULL);
>     gtk_tree_view_append_column(GTK_TREE_VIEW(tree),column);
>     //insert the widget
>     sw=lookup_widget(button,"scrolledwindow1");
>     gtk_container_add(GTK_CONTAINER(sw),tree);
>     gtk_widget_show(tree);
>     w1=lookup_widget(button,"window1");
>     select=gtk_tree_view_get_selection(GTK_TREE_VIEW(tree));
>     gtk_tree_selection_set_mode(select,GTK_SELECTION_SINGLE);
>    
> g_signal_connect(G_OBJECT(select),"changed",G_CALLBACK(tree_selection_changed_cb),NULL);
> 
> 
> 
> }
> 
> 
> void
> on_button2_clicked                     (GtkButton       *button,
>                                         gpointer         user_data)
> {
>     gtk_tree_store_append(store,&iter,NULL);
>     gtk_tree_store_set(store,&iter,TITLE_COLUMN,"The art of
> programming",AUTHOR_COLUMN,"ME",CHECKED_COLUMN,FALSE,-1);    
>     printf("added another row to model\n");
>     gtk_widget_show(tree);
>     
> 
> 
> }
> 
> 
> void
> on_button3_clicked                     (GtkButton       *button,
>                                         gpointer         user_data)
> {
>     gtk_main_quit();
> }
> 
> 
> 
> interface.c
> 
> 
> #ifdef HAVE_CONFIG_H
> #  include <config.h>
> #endif
> 
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <unistd.h>
> #include <string.h>
> #include <stdio.h>
> 
> #include <gdk/gdkkeysyms.h>
> #include <gtk/gtk.h>
> 
> #include "callbacks.h"
> #include "interface.h"
> #include "support.h"
> 
> #define GLADE_HOOKUP_OBJECT(component,widget,name) \
>   g_object_set_data_full (G_OBJECT (component), name, \
>     gtk_widget_ref (widget), (GDestroyNotify) gtk_widget_unref)
> 
> #define GLADE_HOOKUP_OBJECT_NO_REF(component,widget,name) \
>   g_object_set_data (G_OBJECT (component), name, widget)
> 
> GtkWidget*
> create_window1 (void)
> {
>   GtkWidget *window1;
>   GtkWidget *vbox1;
>   GtkWidget *button1;
>   GtkWidget *scrolledwindow1;
>   GtkWidget *button2;
>   GtkWidget *button3;
> 
>   window1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>   gtk_window_set_title (GTK_WINDOW (window1), _("window1"));
> 
>   vbox1 = gtk_vbox_new (FALSE, 0);
>   gtk_widget_show (vbox1);
>   gtk_container_add (GTK_CONTAINER (window1), vbox1);
> 
>   button1 = gtk_button_new_with_mnemonic (_("button1"));
>   gtk_widget_show (button1);
>   gtk_box_pack_start (GTK_BOX (vbox1), button1, FALSE, FALSE, 0);
> 
>   scrolledwindow1 = gtk_scrolled_window_new (NULL, NULL);
>   gtk_widget_show (scrolledwindow1);
>   gtk_box_pack_start (GTK_BOX (vbox1), scrolledwindow1, TRUE, TRUE, 0);
>   gtk_widget_set_size_request (scrolledwindow1, 510, 651);
> 
>   button2 = gtk_button_new_with_mnemonic (_("button2"));
>   gtk_widget_show (button2);
>   gtk_box_pack_start (GTK_BOX (vbox1), button2, FALSE, FALSE, 0);
> 
>   button3 = gtk_button_new_with_mnemonic (_("button3"));
>   gtk_widget_show (button3);
>   gtk_box_pack_start (GTK_BOX (vbox1), button3, FALSE, FALSE, 0);
> 
>   g_signal_connect ((gpointer) button1, "clicked",
>                     G_CALLBACK (on_button1_clicked),
>                     NULL);
>   g_signal_connect ((gpointer) button2, "clicked",
>                     G_CALLBACK (on_button2_clicked),
>                     NULL);
>   g_signal_connect ((gpointer) button3, "clicked",
>                     G_CALLBACK (on_button3_clicked),
>                     NULL);
> 
>   /* Store pointers to all widgets, for use by lookup_widget(). */
>   GLADE_HOOKUP_OBJECT_NO_REF (window1, window1, "window1");
>   GLADE_HOOKUP_OBJECT (window1, vbox1, "vbox1");
>   GLADE_HOOKUP_OBJECT (window1, button1, "button1");
>   GLADE_HOOKUP_OBJECT (window1, scrolledwindow1, "scrolledwindow1");
>   GLADE_HOOKUP_OBJECT (window1, button2, "button2");
>   GLADE_HOOKUP_OBJECT (window1, button3, "button3");
> 
>   return window1;
> }
> 
> 
> 
> 
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