ChatRoom cleint.c Based linux C coding

#include <gtk/gtk.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define OURPORT 8088
gint sd;
struct sockaddr_in s_in;
gchar username[64];
gchar buf[1024];
gchar get_buf[1048];
gboolean isconnected=FALSE;

static GtkWidget *text;
static GtkTextBuffer *buffer;
static GtkWidget *message_entry;
static GtkWidget *message_entry;
static GtkWidget *name_entry;
static GtkWidget *login_button;
//
void get_message(void)
{
	GtkTextIter iter;
	gchar get_buf[1024];
	gchar buf[1024];
	while(read(sd,buf,1024)!=-1)
	{
		sprintf(get_buf,"%s",buf);
		gdk_threads_enter();
		gtk_text_buffer_get_end_iter(buffer,&iter);
		gtk_text_buffer_insert(buffer,&iter,get_buf,-1);
		gdk_threads_leave();
	}
	

}

void on_destory(GtkWidget *widget,GdkEvent *event,gpointer data)
{
	sprintf(username,"guest");
	if(do_connect()==TRUE)
	{
		//set widget's sensitive
		gtk_widget_set_sensitive(login_button,FALSE);
		g_thread_create((GThreadFunc)get_message,NULL,FALSE,NULL);
	}
	gtk_widget_destroy(widget);
}

void on_button_clicked(GtkButton *button,gpointer data)
{
	const gchar *name;
	name=gtk_entry_get_text(GTK_ENTRY(name_entry));
	sprintf(username,"%s",name);
	if(do_connect())
	{
		gtk_widget_set_sensitive(login_button,FALSE);
		g_thread_create((GThreadFunc)get_message,NULL,FALSE,NULL);
	}
	gtk_widget_destroy(data);
}

void create_win(void)
{
        //Creaet login frame
	GtkWidget *win,*vbox;
	GtkWidget *button;
	win=gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_window_set_title(GTK_WINDOW(win),"Please input userName");
	gtk_window_set_position(GTK_WINDOW(win),GTK_WIN_POS_CENTER);
        gtk_window_set_default_size(GTK_WINDOW(win),400,400);
	gtk_container_set_border_width(GTK_CONTAINER(win),10);
	g_signal_connect(G_OBJECT(win),"delete_event",G_CALLBACK(on_destory),NULL);
	//gtk_window_set_modal(GTk_WINDOW(win),TRUE);
	gtk_window_set_position(GTK_WINDOW(win),GTK_WIN_POS_CENTER);
	vbox=gtk_vbox_new(FALSE,0);
	gtk_container_add(GTK_CONTAINER(win),vbox);

	name_entry=gtk_entry_new();
	gtk_box_pack_start(GTK_BOX(vbox),name_entry,TRUE,TRUE,5);
	button=gtk_button_new_from_stock(GTK_STOCK_OK);
	g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_button_clicked),win);
	gtk_box_pack_start(GTK_BOX(vbox),button,FALSE,FALSE,5);
	gtk_widget_show_all(win);
}

gboolean do_connect(void)
{
	GtkTextIter iter;
	gint slen;
	sd=socket(AF_INET,SOCK_STREAM,0);
	if(sd<0)
	{
		gtk_text_buffer_get_end_iter(buffer,&iter);
		gtk_text_buffer_insert(buffer,&iter,"Open socket error!
",-1);
		return FALSE;
	}
	s_in.sin_family=AF_INET;
	s_in.sin_port=OURPORT;
	slen=sizeof(s_in);
	if(connect(sd,(struct sockaddr *)&s_in,slen)<0)
	{
		gtk_text_buffer_get_end_iter(buffer,&iter);
		gtk_text_buffer_insert(buffer,&iter,"Connect server error!
",-1);
		return FALSE;
	}
	else
	{
		gtk_text_buffer_get_end_iter(buffer,&iter);
		gtk_text_buffer_insert(buffer,&iter,username,-1);
		gtk_text_buffer_get_end_iter(buffer,&iter);
		gtk_text_buffer_insert(buffer,&iter,"
Successfully connected to a server!
",-1);
		write(sd,username,64);
		isconnected=TRUE;
		return TRUE;
	}

}

void on_send(GtkButton *button,gpointer data)
{
	const char* message;
	//if(isconnection==FALSE) return;
	message=gtk_entry_get_text(GTK_ENTRY(message_entry));
	sprintf(buf,"%s
",message);
	write(sd,buf,1024);
	gtk_entry_set_text(GTK_ENTRY(message_entry),"");
	

}

void on_login(GtkWidget *button,gpointer data)
{
    create_win();
}

void on_delete_event(GtkWidget *widget,GdkEvent *event,gpointer data)
{
   close(sd);
   gtk_main_quit();
}

int main(int argc,char*argv[])
{
    GtkWidget *window;
    GtkWidget *vbox,*hbox,*button,*label,*view;
    if(!g_thread_supported())
       g_thread_init(NULL);
    gtk_init(&argc,&argv);
    window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window),"client point");
    gtk_window_set_position(GTK_WINDOW(window),GTK_WIN_POS_CENTER);
    gtk_window_set_default_size(GTK_WINDOW(window),400,400);
    g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(on_delete_event),NULL);
    gtk_container_set_border_width(GTK_CONTAINER(window),10);
    vbox=gtk_vbox_new(FALSE,0);
    gtk_container_add(GTK_CONTAINER(window),vbox);

    hbox=gtk_hbox_new(FALSE,0);
    gtk_box_pack_start(GTK_BOX(vbox),hbox,FALSE,FALSE,5);
    label =gtk_label_new("Please click the login button to connect the server");
    gtk_box_pack_start(GTK_BOX(hbox),label,FALSE,FALSE,5);  
    
    //create login button  
    login_button=gtk_button_new_with_label("login");
    gtk_box_pack_start(GTK_BOX(hbox),login_button,FALSE,FALSE,5);
    g_signal_connect(G_OBJECT(login_button),"clicked",G_CALLBACK(on_login),NULL);
    
    view=gtk_scrolled_window_new(NULL,NULL);
    gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(view),GTK_POLICY_AUTOMATIC,GTK_POLICY_AUTOMATIC);
    text=gtk_text_view_new();
    gtk_box_pack_start(GTK_BOX(vbox),view,TRUE,TRUE,5);
    gtk_container_add(GTK_CONTAINER(view),text);
    buffer=gtk_text_view_get_buffer(GTK_TEXT_VIEW(text));

    hbox=gtk_hbox_new(FALSE,0); 
    gtk_box_pack_start(GTK_BOX(vbox),hbox,FALSE,FALSE,5);
    
    label=gtk_label_new("Input message:");
    gtk_box_pack_start(GTK_BOX(hbox),label,FALSE,FALSE,5);

    message_entry=gtk_entry_new();
    gtk_box_pack_start(GTK_BOX(hbox),message_entry,FALSE,FALSE,5);
    
    button=gtk_button_new_with_label("send");
    gtk_box_pack_start(GTK_BOX(hbox),button,FALSE,FALSE,5);
    g_signal_connect(G_OBJECT(button),"clicked",G_CALLBACK(on_send),NULL);
    gtk_widget_show_all(window);
    gdk_threads_enter();//
    gtk_main();
    gdk_threads_leave();
    return FALSE;
    //gtk_widget_show_all(window);
   //gtk_main();
   //return 0;

}