[Glade-users] gtk/glade programming

On Thu, 2003-09-25 at 10:27, Seb James wrote:
Hello all,

My application receives serial data. It has the following code in main.c
to set up the creation of a signal everytime a line is ready to be read
on the serial port:

      /* Now we need to set things up so that receiving a line
         on the serial port will generate a signal to decode the 
         input and display it. */
      serial_input_tag = gdk_input_add (fd, GDK_INPUT_READ, 

And the following code to handle that signal in callbacks.c:

on_serial_data_receive                 (gpointer            user_data,
                                      gint                fd,
                                      GdkInputCondition   target_io_states)
      GtkWidget *console_textview;

      char buf[255];
      gint res;

      /* Don't know how to call lookup_widget in this case: */
      console_textview = lookup_widget (GTK_WIDGET (console_textview), "console_textview");

      res = read(fd,buf,255); 
      buf[res]=0;  /* set end of string, so we can printf */

      /* print the received data to sdout */
      printf("Buffer:%sNumber of characters:%d\n", buf, res);

      /* Plus output it to the console window: */
      gtk_text_buffer_set_text (gtk_text_view_get_buffer (GTK_TEXT_VIEW (console_textview)),
                                _("Buffer text"), -1);
      /* How to replace "Buffer text" with "%s", buf ? */


The comments show my problems - I need to get the text from the serial
port onto a console window that I've created in glade. The problem seems
to be with looking up the widget. The form that I need my signal handler
in doesn't have a `parent' widget for lookup_widget to search for
console_textview in.

I'm trying to do something like that which I programmed for, for
example, closing the console window when its close button is clicked:

on_close_console_clicked               (GtkButton       *button,
                                        gpointer         user_data)
      GtkWidget *console;
      console = lookup_widget (GTK_WIDGET (button), "console");
      gtk_widget_destroy (console);


In this code, you put in GTK_WIDGET (button) as the first argument of
lookup_widget. button is a pointer to the button you clicked, and so
lookup_widget finds console, as it is the parent of the button. However,
my serial_data_receive function has no such widget passed to it. How can
I use lookup_widget here?

Can anyone help with this?

I found out how to work this out. I created a global variable, 
GtkWidget *console_window_global, which I set to being equal to the
variable console, when the console is created. Then, I pass this
variable as the first argument to lookup_widget(). That works, as
lookup_widget can now find the text area that is a child of console.



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