hi i am using following code to print the data which entered in the entry box



#include<glib.h>
#include<gtk/gtk.h>
int i=0;
const gchar *buffer;
GtkWidget *entry;

gint delete_event( GtkWidget *widget, GdkEvent *event, gpointer data )
{
gtk_main_quit ();
return FALSE;
}
void entry_toggle_editable( GtkWidget *checkbutton,
GtkWidget *entry )
{
gtk_editable_set_editable (GTK_EDITABLE (entry),
GTK_TOGGLE_BUTTON (checkbutton)-> active);
}

void clear( GtkWidget *widget, gpointer data )
{
//g_print ("%s ", (gchar *) data);
//g_print ("%s\n", (gchar *) data);
gtk_entry_set_text (GTK_ENTRY (entry), "");
//gtk_text_set_text (" ");
}
/*void submit( GtkWidget *widget, gpointer data )
{
buffer =gtk_entry_get_buffer(GtkEntry *entry);
printf("%s",buffer);
}*/

void submit( GtkWidget *widget,
GtkWidget *entry )
{

const gchar *entry_text;
entry_text = gtk_entry_get_text (GTK_ENTRY (entry));
printf("Entry contents: %s\n", entry_text);

}



int main( int argc, char *argv[] )
{
GtkWidget *window;
GtkWidget *box1;
GtkWidget *box2;
GtkWidget *button;
GtkWidget *separator;
GtkWidget *text;
GtkWidget *table;
GSList *group;
GtkWidget *view;
GSList *check;
//GtkWidget *entry;
GtkTextBuffer *buffer;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Caluclator");
g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (delete_event), NULL);
gtk_container_set_border_width (GTK_CONTAINER (window), 20);



box1 = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (window), box1);
gtk_widget_show (box1);


box2 = gtk_vbox_new (FALSE, 10);
gtk_container_set_border_width (GTK_CONTAINER (box2), 100);
gtk_box_pack_start (GTK_BOX (box1), box2, FALSE, TRUE, 0);
gtk_widget_show (box2);


table = gtk_table_new (5, 5,TRUE);
//gtk_table_set_row_spacing (GTK_TABLE (table), 0, 5);
//gtk_table_set_col_spacing (GTK_TABLE (table), 0, 5);
gtk_box_pack_start (GTK_BOX (box2), table, TRUE, TRUE, 0);
gtk_widget_show (table);



entry = gtk_entry_new ();
gtk_entry_set_max_length (GTK_ENTRY (entry), 10);
// g_signal_connect (G_OBJECT (entry), "activate",
//G_CALLBACK (enter_callback),
//(gpointer) entry);
gtk_entry_set_text (GTK_ENTRY (entry), " ");
gtk_table_attach_defaults(GTK_TABLE (table), entry, 0, 4, 1, 4);
gtk_widget_show (entry);

button = gtk_button_new_with_label("clear");
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (clear), (gpointer) " ");
gtk_table_attach_defaults (GTK_TABLE (table), button, 0,2, 4, 5);
gtk_widget_show (button);

button = gtk_button_new_with_label("Quit");
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (delete_event), (gpointer) " ");
gtk_table_attach_defaults (GTK_TABLE (table), button, 2,4, 4, 5);
gtk_box_pack_start (GTK_BOX (box1), button, TRUE, TRUE, 0);
gtk_widget_show (button);


check = gtk_check_button_new_with_label ("Editable");
//gtk_box_pack_start (GTK_BOX (hbox), check, TRUE, TRUE, 0);
gtk_table_attach_defaults (GTK_TABLE (table), check, 0,1, 0, 1);
g_signal_connect (G_OBJECT (check), "toggled",
G_CALLBACK (entry_toggle_editable), (gpointer) entry);
//gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), TRUE);
gtk_widget_show (check);

button = gtk_button_new_with_label("submit");
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (submit), (gpointer) " ");
gtk_table_attach_defaults (GTK_TABLE (table), button, 0,3, 3, 4);
gtk_widget_show (button);

gtk_widget_show (window);
gtk_main ();
return 0;
}


?*******i am getting the following error while compiling*****



gtk/gtktable.h:119:9: note: expected ‘struct GtkWidget *’ but argument is of type ‘struct GSList *’
dir.c:114:1: warning: passing argument 1 of ‘gtk_widget_show’ from incompatible pointer type
/usr/include/gtk-2.0/gtk/gtkwidget.h:851:9: note: expected ‘struct GtkWidget *’ but argument is of type ‘struct GSList *’
nitish@nirab-WSG37455V-0564:~/myexamples/assaign$ ./dir

(dir:7389): Gtk-CRITICAL **: gtk_box_pack: assertion `child->parent == NULL' failed
Segmentation fault

/*********and getting following error while running.*********/

gtk_box_pack: assertion `child->parent == NULL' failed
Segmentation fault



GUI:

The Gtk CRITICAL error is coming from this line:

Commenting it out gets rid of that error.

The seg fault is coming from your call to GTK_ENTRY(entry) in the submit() function. I would double check what you're doing with submit, and the entry object.

Also, do change your GSList *check to a GtkWidget *check, as per the warning.

thanks williams :


what i want is take input from text box and print the out put in text box
could u please give me code for that program