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 Post subject: gtk2.0 client chat UI ("DATA" help)!
PostPosted: Mon Jul 09, 2012 9:10 pm 
Familiar Face

Joined: Mon Mar 05, 2012 11:55 pm
Posts: 12
So, I am coding a client chat UI with GTK2.0 for Linux. I have the shell of the UI as well as a client side socket. Now I have to make the data part of the chat work.

So, now I have a question.

1. How would I do this?
I assume I would create a gtk bufer and use it with the Linux send or write function and set up signal handlers and callbacks for the send button. What I am afraid of is that if I use a gtk buffer to store the data, it will encode the data in the gtk based buffer using UTF-8. I would most likely then have to convert the data from UTF-8 to us-ascii; Am i wrong?

If someone could please explain how I would achieve this or a better way to accomplish this task; I would greatly appreciate it. Thanks

#include <gtk/gtk.h>
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

static void destroy_event(GtkWidget *widget, gpointer data) {

static gboolean delete_event(GtkWidget *widget, GdkEvent *event, gpointer data) {
return FALSE;

//To compile append `pkg-config --cflags --libs gtk+-2.0`
int main(int argc, char *argv[]) {
GtkWidget *window;
GtkWidget *table;
GtkWidget *view;
GtkWidget *view2;
GtkWidget *file;
GtkWidget *quit;
GtkWidget *button;
GtkWidget *scrolledwindow;
GtkWidget *scrolledwindow2;
GtkWidget *menubar;
GtkWidget *filemenu;
GtkWidget *text_entry;

GdkColor color;

int sockfd, portno, yes = 1;
ssize_t bytes_read, bytes_written; 
struct hostent *server;
struct sockaddr_in serv_addr, cli_addr;
char buffer[4096];

   if(argc < 3)
   fprintf(stderr, "Ussage: %s + IP Address + port No.\n", argv[0]);

sockfd = socket(AF_INET, SOCK_STREAM, 0);
   if(sockfd < 0) {
   printf("SOCKET(-1) error ---> %s.\n", strerror(errno));

   if(sockfd == 0) {
   printf("SOCKET(0) error ---> %s.\n", strerror(errno));

setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));

bzero((char *) &serv_addr, sizeof(serv_addr));
server = gethostbyname(argv[1]);
   if(server == NULL) {
   fprintf(stderr, "No such host.\n");
   printf("%s\n", strerror(errno));

portno = atoi(argv[2]); //Grabbing the port number from the command line
serv_addr.sin_family = AF_INET;
memcpy(&serv_addr.sin_addr.s_addr, server->h_addr, server->h_length);
serv_addr.sin_port = htons(portno);

   if(connect(sockfd, (const struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
   fprintf(stderr, "%s. CONNECT()\n", strerror(errno));
      else {
      printf("Made a connection to %s\n", inet_ntoa(serv_addr.sin_addr));

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), NULL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 500, 400);

table = gtk_table_new(10, 10, TRUE);
gtk_container_add(GTK_CONTAINER(window), table);

menubar = gtk_menu_bar_new();
gtk_table_attach_defaults(GTK_TABLE(table), menubar, 0, 10, 0, 1);

filemenu = gtk_menu_new();

file = gtk_menu_item_new_with_label("File");
quit = gtk_menu_item_new_with_label("Quit");
gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), quit);
gtk_menu_item_set_submenu(GTK_MENU_ITEM(file), filemenu);
gtk_menu_shell_append(GTK_MENU_SHELL(menubar), file);

view = gtk_text_view_new();

//text_entry = gtk_entry_new();
//gtk_table_attach_defaults(GTK_TABLE(table), text_entry, 1, 8, 9, 10);

button = gtk_button_new_with_label("Send");
gtk_table_attach_defaults(GTK_TABLE(table), button, 8, 9, 9, 10);

gdk_color_parse("black", &color);
gtk_widget_modify_bg(GTK_WIDGET(menubar), GTK_STATE_NORMAL, &color);

scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolledwindow), GTK_SHADOW_IN);
gtk_container_add(GTK_CONTAINER(scrolledwindow), view);
gtk_table_attach_defaults(GTK_TABLE(table), scrolledwindow, 1, 9, 2, 7);

view2 = gtk_text_view_new();

scrolledwindow2 = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolledwindow2), GTK_SHADOW_OUT);
gtk_container_add(GTK_CONTAINER(scrolledwindow2), view2);
gtk_table_attach_defaults(GTK_TABLE(table), scrolledwindow2, 1, 8, 9, 10);

g_signal_connect_swapped(G_OBJECT(quit), "activate", G_CALLBACK(gtk_main_quit), NULL);

g_signal_connect_swapped(G_OBJECT(window), "destroy-event", G_CALLBACK(destroy_event), NULL);

g_signal_connect_swapped(G_OBJECT(window), "delete-event", G_CALLBACK(delete_event), NULL);

return 0;

 Post subject: Re: gtk2.0 client chat UI ("DATA" help)!
PostPosted: Tue Jul 10, 2012 11:39 pm 
Familiar Face

Joined: Mon Mar 05, 2012 11:55 pm
Posts: 12
I actually found documentation on this and you can find it here ->

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