Re: GTK_IS_ENTRY failed

["Nils O." Selåsdal <noselasd frisurf no>]

On Fri, 2002-06-28 at 16:09, Thomas Ugland wrote:
> I'm not sure if this is just a problem with my C skills (inwich isnt
> very good yet), or something else. But I anyways try my luck here to see
> if anyone can help me out :)
>
> I'm making a GUI that works against a MySQL database. In the initial
> start I make a config file, if it doenst exist, fetching various info
> (login, pass, etc).
>
> If you see the attached C file you will find that i use an 
> GtkWidget *entry[4];
>
> make new entry box'es on them. This works fine and they show up fine in
> the gtk window, but when I try to use
> gtk_entry_get_text(GTK_ENTRY(entry[0])); it manages to fetch the text
> from the first 4 entry box'es, but the 5th (entry[4]) it errors with:
>
> (a.out:10441): GLib-GObject-WARNING **: invalid cast from `GtkButton' to
> `GtkEntry'
>
> (a.out:10441): Gtk-CRITICAL **: file gtkentry.c: line 3421
> (gtk_entry_get_text): assertion `GTK_IS_ENTRY (entry)' failed
>
> my bad? or something else?
>
> Any help appreciated.. :)
>
> -- 
> Thomas Ugland
>
> -> If everything is coming your way then you're in the wrong lane. <-
> ----

> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> #include <gtk/gtk.h>
>
> GtkWidget *make_entry_with_label(GtkTable *table, const gchar *label_text, gint left_attach, gint 
> right_attach, gint top_attach, 
>                                 gint bottom_attach, gint entry_length);
> gint config_gui(void);
> void action(GtkWidget *entry[]);
>
> int main(int argc, char *argv[])
> {
>     gtk_init(&argc, &argv);
>     config_gui();
>     return 0;
> }
>
> void action(GtkWidget *entry[])
> {
>     printf("H: %s\n", gtk_entry_get_text(GTK_ENTRY(entry[0])));
>     printf("U: %s\n", gtk_entry_get_text(GTK_ENTRY(entry[1])));
>     printf("P: %s\n", gtk_entry_get_text(GTK_ENTRY(entry[2])));
>     printf("D: %s\n", gtk_entry_get_text(GTK_ENTRY(entry[3])));
>     printf("T: %s\n", gtk_entry_get_text(GTK_ENTRY(entry[4])));
> }
> GtkWidget *make_entry_with_label(GtkTable *table,
>                      const gchar *label_text,
>                      gint left_attach,
>                      gint right_attach,
>                      gint top_attach,
>                      gint bottom_attach,
>                      gint entry_length)
> {
>     GtkWidget *entry;
>     GtkWidget *label;
>
>     label = gtk_label_new(label_text);
>     entry = gtk_entry_new();
>     gtk_table_attach(table, label, left_attach, right_attach, top_attach, bottom_attach, GTK_FILL, 
> GTK_EXPAND, 5, 5);
>     gtk_table_attach(table, entry, left_attach + 1, right_attach + 1, top_attach, bottom_attach, GTK_FILL, 
> GTK_EXPAND, 5, 5);
>     gtk_misc_set_alignment(GTK_MISC(label), 1, 0.5);
>     gtk_misc_set_padding(GTK_MISC(label), 2, 2);
>     gtk_entry_set_max_length(GTK_ENTRY(entry), entry_length);
>
>     gtk_widget_show(entry);
>     gtk_widget_show(label);
>
>     return entry;
> }
>
> gint config_gui()
> {
>     GtkWidget *window;
>     GtkWidget *vbox;
>     GtkWidget *bbox;
>     GtkWidget *button;
>     GtkWidget *entry[4];
Here you declare an array to hold 4 elements.

>     GtkWidget *frame;
>     GtkWidget *table;
>
>     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     gtk_window_set_title(GTK_WINDOW(window), "Database login configuration");
>     gtk_container_set_border_width(GTK_CONTAINER(window), 10);
>     g_signal_connect(GTK_WINDOW(window), "delete_event", G_CALLBACK(gtk_main_quit), NULL);
>     
>     frame = gtk_frame_new("Database login configuration:");
>     vbox = gtk_vbox_new(FALSE, 5);
>     table = gtk_table_new(4,2, FALSE);
>
>     gtk_container_add(GTK_CONTAINER(window), vbox);
>     gtk_box_pack_start(GTK_BOX(vbox), frame, FALSE, FALSE, 0);
>     gtk_container_add(GTK_CONTAINER(frame), table);
>
>     entry[0] = make_entry_with_label(GTK_TABLE(table), "Hostname:", 0,1,0,1,32);
>     entry[1] = make_entry_with_label(GTK_TABLE(table), "Username:", 0,1,1,2,15);
>     entry[2] = make_entry_with_label(GTK_TABLE(table), "Password:", 0,1,2,3,15);
>     gtk_entry_set_visibility(GTK_ENTRY(entry[2]), FALSE);
>     entry[3] = make_entry_with_label(GTK_TABLE(table), "Database:", 0,1,3,4,15);
>     entry[4] = make_entry_with_label(GTK_TABLE(table), "Table:", 0,1,4,5,15);
And here you element at location 5. In an array[4] you only have 0,1,2,3
that's 4 elements, make room for the fift in the declaration above.

 
>     bbox = gtk_hbutton_box_new();
>     gtk_box_pack_start(GTK_BOX(vbox), bbox, TRUE, TRUE, 3);
>     gtk_button_box_set_layout(GTK_BUTTON_BOX(bbox), GTK_BUTTONBOX_END);
>     gtk_box_set_spacing(GTK_BOX(bbox), 10);
>     
>     button = gtk_button_new_from_stock(GTK_STOCK_OK);
>     gtk_container_add(GTK_CONTAINER(bbox), button);
>     g_signal_connect_swapped(G_OBJECT(button), "clicked", G_CALLBACK(action), entry);
>     button = gtk_button_new_from_stock(GTK_STOCK_CANCEL);
>     g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(gtk_main_quit), NULL);
>     gtk_container_add(GTK_CONTAINER(bbox), button);
>     gtk_widget_show_all(window);
>     gtk_main();
>     return 0;
> }
-- 
Nils Olav Selåsdal <NOS Utel no>
System Developer, UtelSystems a/s
w w w . u t e l s y s t e m s . c o m