Re: Calling C++ functions

["William L. Thomson Jr." <support obsidian-studios com>]

On Wed, 2002-06-26 at 09:47, Wolfgang Draxinger wrote:
> William L. Thomson Jr. wrote:
> > I am having problems calling C++ functions from my GTK buttons.
> No, you want to call class members. C++ functions don't differ from C 
> functions.

Ok?

> You know, that a class member function is not the same as a global 
> function?

Yes, I had not problem with the function when they were not part of a
class. As soon as I add the functions to the class I can not longer call
the function. Most likely due to my lack of knowledge.

> There is a standard argument to every class member function:
> The this pointer.
>
> class Foo
> {
>       char Bar(int foobar);
> };
>
> A class member function pointer type of Foo::Bar(...) is e.g.
>
> char (Foo::*pBar)(int)=&Foo::Bar;
>
> You see, that this has another type than a G_Callback, even if it has 
> the same parameter list, since the compiler internally makes something like
>
> char Bar Foo(Foo*, int);
>
> from it.

Sorry but this is a little over my head so if I could break it down for
clarity that will help me make sense out of it.

So I need to do something along the lines of

char (Foo::*pBar)(int)=&Foo::Bar;

Inside my class, or as part of my app. And then what would I pass or use
in my button 

gtk_signal_connect_object(GTK_OBJECT(new_button),"clicked",GTK_SIGNAL_FUNC(Bar),GTK_OBJECT(window));

to call the Foo classes Bar function?

Please excuse my ignorance. I am trying my best to learn, but I believe
it is important to understand completely even the smallest of concepts.

Also please reserve any insults until the next time you are in front of
a mirror. :)

-- 
Sincerely,
William L. Thomson Jr.
Support Group
Obsidian-Studios Inc.
439 Amber Way
Petaluma, Ca. 94952
Phone  707.766.9509
Fax    707.766.8989
http://www.obsidian-studios.com