Results 1 to 1 of 1

Thread: gtk_entry_get_text: assertion 'GTK_IS_ENTRY (entry)' failed

  1. #1
    Join Date
    Aug 2014

    gtk_entry_get_text: assertion 'GTK_IS_ENTRY (entry)' failed

    Hello, I'm creating a small program with C++ and GTK 3 (just learning it), and i have had trouble with this. So, i isolated the problematic part.

    It is suposed to get the entry and print it when the button is clicked.

    This is the code:

    #include <iostream>
    #include <gtk/gtk.h>
    using namespace std;
    GtkWidget *wventana;
    GtkWidget *wgrid;
    void ventana(string titulo, int margen)
        const char * tituloc = titulo.c_str();
        wventana = gtk_window_new (GTK_WINDOW_TOPLEVEL);
        gtk_window_set_position (GTK_WINDOW (wventana), GTK_WIN_POS_CENTER);
        gtk_window_set_title (GTK_WINDOW (wventana), tituloc);
        gtk_container_set_border_width(GTK_CONTAINER(wventana), margen);
    void grid()
        wgrid = gtk_grid_new();
        gtk_container_add(GTK_CONTAINER(wventana), wgrid);
        gtk_grid_set_row_spacing (GTK_GRID (wgrid), 10);
        gtk_grid_set_column_spacing (GTK_GRID (wgrid), 25);
    void boton_clic (GtkEntry *wentrada, gpointer user_data)
        const char *nombre;
        nombre = gtk_entry_get_text(wentrada);
        cout << nombre << endl;
    void entrada(int x, int y, int lx, int ly)
        GtkWidget *wentrada;
        wentrada = gtk_entry_new();
        gtk_grid_attach (GTK_GRID (wgrid), wentrada, x, y, lx, ly);
    void boton(string texto, int x, int y, int lx, int ly)
        const char * wtexto = texto.c_str();
        GtkWidget *wboton;
        wboton = gtk_button_new_with_label (wtexto);
        gtk_grid_attach (GTK_GRID (wgrid), wboton, x, y, lx, ly);
        g_signal_connect (GTK_BUTTON (wboton), "clicked", G_CALLBACK (boton_clic), G_OBJECT (wventana));
    int main(int argc, char *argv[])
        gtk_init (&argc, &argv);
        entrada(1, 1, 1, 1);
        boton("Aprietame", 1, 2, 1, 1);
        gtk_widget_show_all (wventana);
        gtk_main ();
        return 0;

    It doesnt get the entry and shows the following error message:

    (boton:6669): Gtk-CRITICAL **: gtk_entry_get_text: assertion 'GTK_IS_ENTRY (entry)' failed
    Could anyone please tell what the problem is? and, how can I make it work?
    Or in any case, what is a good alternative to do this? (it has to be with separated functions)

    Thanks in advance.
    Last edited by fahedsl; August 28th, 2014 at 11:42 AM.

Tags for this Thread


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts