Re: get integer/real number from gtk_entry_set_text

[Rudra Banerjee]

I tried putting 
#include <stdlib.h>
and 
i=atoi(entry);
printf("%d", i );

Now the complete program looks like:
#include <stdlib.h>
#include <stdio.h>
#include <gtk/gtk.h>

void enter_callback( GtkWidget *widget,
                     GtkWidget *entry )
{
  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 *vbox, *hbox;
    GtkWidget *entry;
    GtkWidget *button;
    GtkWidget *check;
    GtkWidget *table;
 
    gtk_init (&argc, &argv);
int i; double d;
    /* create a new window */
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW (window), "GTK Entry");
    gtk_signal_connect(GTK_OBJECT (window), "delete_event",
                       (GtkSignalFunc) gtk_exit, NULL);

/*  CREATE TABLE
 */

    table = gtk_table_new (5, 3, TRUE);
    gtk_container_add (GTK_CONTAINER (window), table);

/*
 *CREATE ENTRY FOR ATOM 1
 */
    entry = gtk_entry_new_with_max_length (2);
    gtk_table_attach_defaults (GTK_TABLE (table), entry, 0, 1, 0, 1);
    gtk_signal_connect(GTK_OBJECT(entry), "activate",
                       GTK_SIGNAL_FUNC(enter_callback),
                       entry);
    gtk_entry_set_text (GTK_ENTRY (entry), "A");
    gtk_widget_show (entry);

i=atoi(entry);
printf("%d", i );

    gtk_widget_show (button);
    gtk_widget_show (table);
    gtk_widget_show(window);

    gtk_main();
    return(0);
}

but it still fails with segmentation fault.

$gcc -g mini_ten.c -o ften `pkg-config --cflags gtk+-2.0` `pkg-config
--libs gtk+-2.0`
mini_ten.c: In function ‘enter_callback’:
mini_ten.c:11:14: warning: assignment discards ‘const’ qualifier from
pointer target type [enabled by default]
mini_ten.c: In function ‘main’:
mini_ten.c:51:1: warning: passing argument 1 of ‘atoi’ from incompatible
pointer type [enabled by default]
/usr/include/stdlib.h:148:12: note: expected ‘const char *’ but argument
is of type ‘struct GtkWidget *’

$./ften 
Segmentation fault (core dumped)


On Sat, 2012-05-12 at 21:01 -0400, Rudra Banerjee wrote:
> Friends,
> How can I convert gtk_entry_set_text to an integer/real number?
> Below is a minimal example. Please suggest.
> #include <stdio.h>
> #include <gtk/gtk.h>
> 
> void enter_callback( GtkWidget *widget,
>                      GtkWidget *entry )
> {
>   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 *vbox, *hbox;
>     GtkWidget *entry;
>     GtkWidget *button;
>     GtkWidget *check;
>     GtkWidget *table;
>  
>     gtk_init (&argc, &argv);
> 
>     /* create a new window */
>     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>     gtk_window_set_title(GTK_WINDOW (window), "GTK Entry");
>     gtk_signal_connect(GTK_OBJECT (window), "delete_event",
>                        (GtkSignalFunc) gtk_exit, NULL);
> 
> /*  CREATE TABLE
>  */
> 
>     table = gtk_table_new (5, 3, TRUE);
>     gtk_container_add (GTK_CONTAINER (window), table);
> 
> /*
>  *CREATE ENTRY FOR ATOM 1
>  */
>     entry = gtk_entry_new_with_max_length (2);
>     gtk_table_attach_defaults (GTK_TABLE (table), entry, 0, 1, 0, 1);
>     gtk_signal_connect(GTK_OBJECT(entry), "activate",
>                        GTK_SIGNAL_FUNC(enter_callback),
>                        entry);
>     gtk_entry_set_text (GTK_ENTRY (entry), "A");
>     gtk_widget_show (entry);
> 
>     gtk_widget_show (button);
>     gtk_widget_show (table);
>     gtk_widget_show(window);
> 
>     gtk_main();
>     return(0);
> }
> 
> _______________________________________________
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> gtk-app-devel-list@gnome.org
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