[Glade-users] gtk/glade programming

[seb hypercubesystems co uk (Seb James)]

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, 
>                                         on_serial_data_receive, 
>                                         &target_io_states);    
>
>
> And the following code to handle that signal in callbacks.c:
>
> void
> 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 ? */
>
>       return;
> }
>
>
> 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:
>
> void
> on_close_console_clicked               (GtkButton       *button,
>                                         gpointer         user_data)
> {
>       GtkWidget *console;
>       console = lookup_widget (GTK_WIDGET (button), "console");
>       gtk_widget_destroy (console);
>
>       return;
> }
>
> 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.


> Thanks
>
> Seb.
>
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