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Access a GtkWidget in C from guile?
- To: guile-gtk at sourceware dot cygnus dot com
- Subject: Access a GtkWidget in C from guile?
- From: Brett Viren <bviren at superk dot physics dot sunysb dot edu>
- Date: Sat, 3 Jun 2000 18:27:50 -0400 (EDT)
- Reply-To: Brett Viren <bviren at superk dot physics dot sunysb dot edu>
Hello,
From guile, I want to access a GnomeCanvas which has been created in
(non guile-gtk) C code.
To explain, here are some details:
- I have a C structure which holds my app's data, including a pointer
to a GnomeCanvas widget. As a simplified example:
typedef struct _my_app_data {
int blah;
GnomeCanvas *canvas;
} my_app_data;
- I have a function which allocates memory and sets up things,
including the canvas and various GnomeCanvasItems:
my_app_data *init_my_app_data ();
- I wrap `my_app_data' as a guile SMOB and also package any functions
which operate on `my_app_data' into a dynamically linked lib
(following Guile's data-rep.info as well as ``Dynamic Linking and
Compiled Code Modules'' in the guile-ref info page). This lib is at
`my/libapp.so' in my GUILE_LOAD_PATH. One of the functions I wrapped
is `init_my_app_data'. So, after I do:
(use-modules (my app))
in guile then I can see the function `init-my-app-data' which is the
scheme equiv to `init_my_app_data'.
- Now comes the problem: In scheme I need to do something like:
(use-modules (my app)
(gnome gnome)
(gtk gtk)
(gtk gdk))
;; ...
(let ((window (gtk-window-new 'toplevel))
(mad (init-my-app-data some args)))
(gtk-container-add window (give-me-a-canvas mad))
...)
Where `(give-me-a-canvas mad)' needs to return a guile-ified version
of my C-land GnomeCanvas.
Any pointers (pun intended) would be appreciated.
Thanks,
-Brett.