RE: programming practices with regard to gtk and networking

[Ken Nagorski <kenn refriedgeeks com>]

Hi there,

Well I figured it out... sorda, like I said I just started working with 
this but in reading the posts it dawned on me, The callback! Yes that is 
it. I can pass pointers into the callback... what I did was pass the 
address of sockfd to the connect button, the connect function just 
puts int in the memory location. well, you guys know.Then when I click 
the send button I pass it the address of sockfd as well. That seems
to work. of course I will need to actually pass a struct to
send so that I can give it information as to where to
get the text to send (rigth not it is just a hard coded test message) and
whatever else it needs but I am on the way.

Again, I just started with this and there is a little more of a learning 
curver than with java but it is alot of fun!

Thanks
Ken

here is some code.
/********** the connect function **********************/
static void connect_to_server(GtkWidget *widget, int *sockfd)
{
        struct sockaddr_in dest_addr;   /* will hold the destination addr 
*/
        if ((*sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 
perror("socket"); exit(1); }

        dest_addr.sin_family = AF_INET;        /* host byte order */
        dest_addr.sin_port = htons(DEST_PORT); /* short, network byte 
order */
        dest_addr.sin_addr.s_addr = inet_addr(DEST_IP);
        bzero(&(dest_addr.sin_zero), 8);       /* zero the rest of the 
struct */

        if (connect(*sockfd, (struct sockaddr *)&dest_addr, sizeof(struct 
sockaddr)) == -1)
        { perror("connect"); exit(1); }
}

/********** this is how I call it from main *********************/
g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK 
(connect_to_server), &sockfd);

On Thu, 26 Jan 2006, Freddie Unpenstein wrote:

> Date: Thu, 26 Jan 2006 06:02:55 -0500 (EST)
> From: Freddie Unpenstein <fredderic excite com>
> To: kenn refriedgeeks com, gtk-app-devel-list gnome org
> Subject: RE: programming practices with regard to gtk and networking
>
>
> > What I need to do is somehow create the connection when the button
>
> > is clicked and then pass the sockfd to the calling part of the
>
> > programming (main) so I can then use that in the calls to send().
>
> > What I really need is someone to point me in the right direction.
>
>
>
> How many connections will you be making?  How long will these connections persist?  And what new signal 
> connections will you be making after this connection has been made?
>
>
>
> Sounds to me like you'd be better off creating an object that handles the connection.  The object would offer 
> methods to create a connection, send and receive messages and what-not, and finally close the connection.
>
>
>
> You could then create a new (un-connected) "connection" object, and pass a reference to that in the user_data of the 
> button.  The button would then just have to trigger the "connect" method of the object.
>
>
>
> If you want to avoid creating a whole GObject for it, you can just put together a struct with all the 
> relevant bits and pieces, and call all your functions with a naming structure similar to what GTK uses.  
> (Which is basically all an object is anyhow, until you start adding OOP features like inheritance, property 
> introspection, etc.)
>
>
>
>
>
> Fredderic
>
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