chatclient.c

聊天程序~使用LINUX c 语言实现~

/* chatclient.c */

#include <stdlib.h>
#include <stdio.h>
#include <cnaiapi.h>

#define BUFFSIZE		256
#define INPUT_PROMPT		"Input_$"
#define RECEIVED_PROMPT		"Received:"

int recvln(connection, char *, int);
int readln(char *, int);

int main(int argc, char *argv[]) {
      char *msg="The author of this program is iFreeBSD (version 1.0)\n" ; 
	computer	comp;
	connection	conn;
	char		buff[BUFFSIZE];
	int		len;
      printf(msg) ;
	if (argc != 3) {
		(void) fprintf(stderr, "usage: %s <compname> <appnum>\n",
			       argv[0]);
		exit(1);
	}

	comp = cname_to_comp(argv[1]);
	if (comp == -1)
		exit(1);

	conn = make_contact(comp, (appnum) atoi(argv[2]));
	if (conn < 0) 
		exit(1);

	printf("Connection Is Established.\n");
	printf(INPUT_PROMPT);
	fflush(stdout);

	while((len = readln(buff, BUFFSIZE)) > 0) {
		buff[len - 1] = '\n';
		send(conn, buff, len, 0);
		

		if ((len = recvln(conn, buff, BUFFSIZE)) < 1)
			break;
		printf(RECEIVED_PROMPT);
		fflush(stdout);
		write(STDOUT_FILENO, buff, len);

	      printf(INPUT_PROMPT);
	      fflush(stdout);
	}

	

	printf("\nClosed.Bye!\n");
	send_eof(conn);
	exit(0);
}