main{
    ...
/* le show running config*/

  button_runnig_conf = gtk_button_new_with_mnemonic ("running-config");

  gtk_box_pack_start (GTK_BOX (hbox_cdp1), button_runnig_conf, FALSE, FALSE, 0);

  gtk_widget_set_size_request (button_runnig_conf, 130, -1);
  g_signal_connect(G_OBJECT(button_runnig_conf), "clicked", G_CALLBACK(f_button(NULL,"show running-config",2)),NULL);


/*le show start-up*/

  button_startup_conf = gtk_button_new_with_mnemonic ("startup-config");

  gtk_box_pack_start (GTK_BOX (hbox_cdp1), button_startup_conf, FALSE, FALSE, 0);

  gtk_widget_set_size_request (button_startup_conf, 130, -1);

  g_signal_connect(G_OBJECT(button_startup_conf), "clicked", G_CALLBACK(f_button(NULL,"show startup-config", 2)),NULL );


/*le show version*/

  button_version = gtk_button_new_with_mnemonic ("version");

  gtk_box_pack_start (GTK_BOX (hbox_cdp1), button_version, FALSE, FALSE, 0);

  gtk_widget_set_size_request (button_version, 130, -1);

g_signal_connect(G_OBJECT(button_version), "clicked", G_CALLBACK(f_button(NULL,"show version", 1)),NULL );



  hbox_cdp2 = gtk_hbox_new (TRUE, 0);

  gtk_box_pack_start (GTK_BOX (vbox2), hbox_cdp2, TRUE, TRUE, 0);

  gtk_container_set_border_width (GTK_CONTAINER (hbox_cdp2), 5);



/*le show process*/

  button_processes = gtk_button_new_with_mnemonic ("processes");

  gtk_box_pack_start (GTK_BOX (hbox_cdp2), button_processes, FALSE, FALSE, 0);

  gtk_widget_set_size_request (button_processes, 130, -1);

g_signal_connect(G_OBJECT(button_processes), "clicked", G_CALLBACK(f_button(NULL,"show processes", 1)),NULL);


/*le show stacks*/

  button_stacks = gtk_button_new_with_mnemonic ("stacks");

  gtk_box_pack_start (GTK_BOX (hbox_cdp2), button_stacks, FALSE, FALSE, 0);

  gtk_widget_set_size_request (button_stacks, 130, -1);

g_signal_connect(G_OBJECT(button_stacks), "clicked", G_CALLBACK(f_button(NULL,"show stacks", 1)),NULL );
    ....
}
int f_button(GtkWidget* pBouton,char commande[70], int connexion_mode)

{

	printf("%s\n",commande);

/*

	char verif[70] = {0};				// declaration des variables

	char resultat_commande[20000] = {0};

	FILE* fichier_terminal = NULL ;



	 switch (connexion_mode)

	 {

	 case 1 : 

		 strcpy( verif , send_requette2(NULL , 1 ) );

		 if ( strcmp(verif , "Connected") == NULL )      // verification de la connections

		 {

			strcpy(resultat_commande ,  send_requette2(commande , 2) );

			send_requette2(NULL , 3);

		 }

		 else

		 {

			test("Connection error");

			return 0;

		 }

			break;

	 case 2 :

		 strcpy( verif , send_requette2(NULL , 1 ) );

		 if ( strcmp(verif , "Connected") == NULL )      // verification de la connections

		 {

		 send_requette2("enable" , 2); // entre en mode privilegie

		 send_requette2(password , 2); // entre le passwd

		 strcpy(resultat_commande ,  send_requette2(commande , 2) );      // envoi de la commande (ici show running-config)

		 send_requette2("disable" , 2);  // sort du mode configuration globale

		 send_requette2(NULL , 3); // ce deconnect du serveur 

		 }

		 else

		 {

			test("Connection error");

			return 0;

		 }

			break;

	 case 3 : 

		 strcpy( verif , send_requette2(NULL , 1 ) );

		 if ( strcmp(verif , "Connected") == NULL )      // verification de la connections

		 {

			send_requette2("enable" , 2); // entre en mode privilegie  //<-- mode privilégié

			send_requette2(password , 2); // entre le passwd

			send_requette2("configure terminal" , 2); // entre en mode de conf. global 

			strcpy(resultat_commande ,  send_requette2(commande , 2) );      // envoi de la commande (ici show running-config)

			send_requette2("exit" , 2);  // sort du mode configuration globale

			send_requette2("disable" , 2);  // sort du mode configuration globale

			send_requette2(NULL , 3); // ce deconnect du serveur 

		 }

		 else

		 {

			test("Connection error");

			return 0;

		 }

			break;



	 default :

			test("Connection error");

			return 0;

		 break ;



	}



	 	fichier_terminal = fopen("terminal.txt" , "w");         // on enregistre dans terminal.txt le resulat

		fputs(resultat_commande , fichier_terminal); 

		fclose(fichier_terminal);

		return 1 ;
		*/

}

donc en fait si je fais une structure,ca sert à rien,car comme tu vois en haut,pour chaque bouton,le niveau doit avoir un certain numéro,selon le bouton et donc voilà..