gtk_object_get_data

[Richard Hult <rhult hem2 passagen se>]

Easy quiestion: How would I do to get the width of a canvas text? I have tried this:

gtk_object_get_data (GTK_OBJECT (text), "text_width")

but it always returns NULL. Is this the right function or if not what is the right way? I've looked through the gtk+ docs and lots of source code but I haven't found the answer.

Thanks
Richard