Re: GType stuff again!

["Murray Cumming" <murrayc murrayc com>]

> On Tue, 2006-09-19 at 11:43 +0200, Johannes Schmid wrote:
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>> Hi!
>>
>> I tried out the examples in gtkmm to find out if they are able to handle
>> their GTypenames correclty. Unfortunately they do not:
>>
>> std::cout << g_type_name(get_type()) << std::endl;

Maybe get_type() isn't returning what we think it's returning, but I'm
fairly sure that custom gtypes are being created.

>> in the cellrenderercustom example just gives me
>> "gtkmm__GtkCellRenderer". But of course g_object_new(type) will give not
>> give me a custom but a standart CellRenderer.
>>
>> Anyway, I still need something that gives me a custom type that
>> g_object_new can handle.
>
> i am confused. since g_object_new cannot possibly instantiate a C++
> object, what is the value of get_type() returning a value that can be
> used at the C level?
>
> you can't create C++ objects (the ones that gtkmm is composed of) from C
> without a *lot* more glue code (eg. factory functions declared extern
> "C" that return each type of object as a gpointer etc etc)

But maybe we really can make it work, by registering an appropriate init
function for our new GType. It would be clever though.

Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com