Re: Nautilus Extension Problem

[Colomban Wendling <lists ban herbesfolles org>]

Hi,

Le 15/01/2013 18:51, Ozojie Chikelu a écrit :
> Hi
> 
> I have this application that am developing and I want to integrate it to
> nautilus file manager on ubuntu 12.04 and am facing problems
> 
> according to the guide here
> http://taschenorakel.de/svn/repos/bulldozer/tags/release-0.1.0/documentation/NautilusExtensions.html
> I should be able to build this
> 
> [...]

You're writing C++ here, not C.  It can work (I think), but you need to
take extra care for the symbols that Nautilus must see to have C linkage
(the extern C stuff).  I suggest you to write your extension in plain C,
at least when you start, because it's highly likely to make it way harder.


> void test_stuff(NautilusMenuItem *item, gpointer user_data)
> {
>     char* folders;
>     folders = g_object_get_data(item, "folder");
> 
>     cout << folders;
> }
> but it doesn't build.
> 
> I get this error:
> 
> /home/zouga/DevStuffs/couttest/main.cpp:49: error: cannot convert
> 'NautilusMenuItem* {aka _NautilusMenuItem*}' to 'GObject* {aka
> _GObject*}' for argument '1' to 'void g_object_set_data(GObject*, const
> gchar*, gpointer)'

As said, it's supposed to be C, NautilusMenuItem is *not* a C++ class,
but a C struct, which happen to be a "substruct" of GObject (and
others).  Take a look at the documentation for GObject for details how
it works.

Here, you should cast the first argument of g_object_get_data() to
GObject using the G_OBJECT() macro:

  g_object_get_data(G_OBJECT(item), ...);


> please what am I doing wrong

A cast too few, but mostly using C++ rather than C.


Regards,
Colomban