Le mercredi 06 juillet 2005 à 23:32 +0200, David Necas (Yeti) a écrit :
> On Wed, Jul 06, 2005 at 10:58:59PM +0200, Jean Bréfort wrote:
> > That is, the first parameter of your callback is the button which was clicked, unless you use g_signal_connect_swapped.
> > SQo you have two solutions, either, you change the signayure of MessageInfo:
> > gboolean MessageInfo(GtkButoon* btn, std::string& msg){...}
> > or you use g_signal_connect_swapped:
> > g_signal_connect_swapped(GTK_OBJECT(btnCreateAccount), "clicked",
> > GTK_SIGNAL_FUNC(MessageInfo), NULL);
>
> Note however, GObject callbacks don't mix very logically
> with C++ pass-by-reference argument style.
>
> You can't pass a std::string variable as the last argument of
> g_signal_connect() as you would in direct function call, you
> have to pass a pointer, and once you do that, it doesn't
> make sense to declare
>
> MessageInfo(std::string &msg)
>
> instead of
>
> MessageInfo(std::string *msg)
>
> Yeti
Yes, I missed that yesterday evening :(
You must also pass this pointer to the g_signal_connect or
g_signal_connect_swapped call as the last argument. If you use NULL,
your callback will be called with a NULL argument.
Jean
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