On Wed, 2003-11-05 at 14:59, Tim Evans wrote:
> Tobbi wrote:
> > Hi,
> > I'm actually developing an application standing at Gtk having two parts
> > - Ansi C and Python.
> > The problem I met is how to get a C pointer of Gtk object relating to
> > Python pyGtk object and vice versa.
> >
> > Example:
> >
> > Python:
> > button = gtk.Button()
> > C:
> > gtk_widget_destroy(button)
> >
> > I've found some solution speaking about "_o" field of pyGtk object.
> > However my object doesn't seem to have such pointer. Also, the
> > descriptions speak about gtk.GtkButton instead of gtk.Button.
> >
> > Is it version mismatch? I'm using pygtk-2.0 and python 2.2.x
> >
> > So, is there a way to get pointer to wrapped pygtk object? Is there a
> > way to create pygtk wrapper to already existing gtk object?
>
> Others have already pointed out the difference between pygtk-0.6 and
> 2.0, and that you are reading some outdate documentation. The following
> is how to do it for pygtk-2.0. I'm assume that you already know how to
> write a python extension in C.
>
> - Make your foomodule.c look like this:
>
> #include <pygobject.h>
> #include <pygtk.h>
> /* global variable declared at top of file */
> static PyTypeObject *PyGObject_Type=NULL;
> /* ... */
> void initfoo(void)
> {
> PyObject *module;
> Py_InitModule("foo", foo_functions);
>
> init_pygobject();
> init_pygtk();
> module = PyImport_ImportModule("gobject");
> if (module) {
> PyGObject_Type =
> (PyTypeObject*)PyObject_GetAttrString(module, "GObject");
> Py_DECREF(module);
> }
> }
>
> - To create a python gtk widget from a C gtk widget:
> pygobject_new((GObject*) widget);
> If a python wrapper for 'widget' already exists, it will incref and
> return that, other wise it will create a new python wrapper object.
>
Do you possibly have a concrete example for this? In particular, I have
a a custom gtk treeModel that I would like to wrap?
> - To get a pointer to the underlying C widget from a Python widget that
> was passed as an argument, do something like this:
>
> PyGObject *py_widget;
> GtkWidget *widget;
>
> if (!PyArg_ParseTuple(args, "O!", PyGObject_Type, &py_widget))
> return NULL;
> widget = GTK_WIDGET(py_widget->obj);
>
> You might also want to look at the 'codegen' stuff that pygtk uses to
> automatically generate most of the pygtk interface. Once you get used
> to using it, it's much easier to use than writing everything by hand.
Thanks
Dave Farning
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