[Glade-users] Problem with GtkTextView and GtkTextBuffer

[Tristan Van Berkom]

On Tue, Jan 24, 2012 at 8:21 PM, Manuel Ferrero <mferrero at reer.it> wrote:
> I have a problem managing the GtkTextView widget in an application I built
> with Glade3.
>
> // I define a structure with all the data I'll need in my callback
> functions:
>
> typedef struct _ChData ChData;
> struct _ChData
> {
>    GtkWidget *window;
>    GtkWidget *connect_button;
>    GtkWidget *serial_data;
> };
>
>
> // In my main I allocate the struct data and I get the objects from the
> glade file:
> [...]
> ChData *data;
> GtkBuilder *builder_handler;
>
> data = g_slice_new(ChData);
>
> builder_handler = gtk_builder_new();
> gtk_builder_add_from_file(builder_handler, GUI_XML_FILENAME, NULL);
>
> data->window = GTK_WIDGET(gtk_builder_get_object(builder_handler,
> "window"));
> data->connect_button = GTK_WIDGET(gtk_builder_get_object(builder_handler,
> "connect_button"));
> data->serial_data = GTK_WIDGET(gtk_builder_get_object(builder_handler,
> "serial_data"));
>
>
> // Then I connect the signals, show the UI and go in the main loop
>
> gtk_builder_connect_signals(builder_handler, data);
>
> gtk_widget_show(data->window);
>
> gtk_main();
>
>
>
> // Now, in one callback function I'd like to write some text in the text
> area
>
> // I get the buffer from the GtkTextView widget
> GtkTextBuffer *serial_buffer_ptr;
>
> serial_buffer_ptr =
> gtk_text_view_get_buffer(GTK_TEXT_VIEW(data.serial_data));

I think what you need is data->serial_data, i.e. you dont pass the
structure to the callbacks but a pointer to a structure.

Cheers,
            -Tristan


>
>
> // but this line triggers the following error:
> GLib-GObject-WARNING **: invalid uninstantiatable type `<unknown>' in cast
> to `GtkTextView'
>
> Where am I doing wrong?
> --
> Regards,
> Manuel Ferrero
> R&D department
>
> Reer SpA
> Tel.  +39 011 2482215
> Fax. +39 011 859867
>
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