Hello.
I'm am new to gtk+ and I try to write a simple application, I need to
read a double from an entry, I've already written a parsing
*char->double function but I can't even read from the entry using
gtk_editable_get_chars because I get Segmentation Fault. I don't know
what is the reason for this, so I'll post parts of the code so that
you could help me in finding the bug:
calculate.c
===================
#include <glib.h>
#include <gtk/gtkwidget.h>
#include <gtk/gtkentry.h>
#include <stdio.h>
#include "calculate.h"
#include "main_window.h"
/* ... */
void calculate_cb(GtkWidget *widget, GdkEvent *event, gpointer data)
{
double a = 0;
gchar *s = NULL;
MainWindow *main_window = (MainWindow *)data;
/*
* segmentation fault here
*/
s = gtk_editable_get_chars(GTK_EDITABLE(main_window->a_entry),
0, -1);
if (parse_double(s, &a)) {
DO_SOME_STUFF_WITH_IT(a);
g_free((gpointer)s);
}
=====================
main_window.c
=====================
#include <glib.h>
/* ... */
#include <gtk/gtkmain.h>
#include "main_window.h"
#include "calculate.h"
/* ... */
MainWindow *main_window_create(void)
{
MainWindow *main_window;
main_window = g_malloc(sizeof(MainWindow));
main_window->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
/* ...... oter widgets, callbacks ................ */
main_window->calc_btn = gtk_button_new_with_label("calculate");
g_signal_connect(G_OBJECT(main_window->calc_btn), "clicked",
G_CALLBACK(calculate_cb), main_window);
main_window->a_entry = gtk_entry_new();
gtk_entry_set_max_length(GTK_ENTRY(main_window->a_entry),
ENTRY_MAX_LEN);
/* doesn't show main_window->window */
show_all_widgets(&main_window);
/* ..... putting in a table ............ */
gtk_widget_show(main_window->window);
return main_window;
}
================
main.c
================
#include <stdio.h>
#include <glib.h>
#include <gtk/gtkmain.h>
#include "main_window.h"
int main(int argc, char *argv[])
{
MainWindow *main_window;
gtk_init(&argc, &argv);
main_window = main_window_create();
gtk_main();
return 0;
}
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