sender.c

这是一个在局域网下的即时聊天工具, 由于本人是编程初学者, 非常希望从贵站点中得到宝贵的源码资料供我学习和参考, 请站长允许我加入,谢谢!

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <errno.h>

#define PORT 9999

main(int argc, char **argv)
{
int sock_fd;
char buf[256];
struct sockaddr_in address;
struct hostent *host;

if (argc != 2)
 {
 printf("Usage: %s IP/hostname [content]\n", argv[0]);
 exit(255);
 }

if ((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
 {
 printf("Socket error!\n");
 exit(255);
 }

if (inet_aton(argv[1], &address.sin_addr) != 0)
 {
 host = gethostbyaddr((char *)&address.sin_addr, 4, AF_INET);
 printf("Address information of IP %s\n", argv[1]);
 }
else
 {
 host = gethostbyname(argv[1]);
 printf("Address information of hostname %s\n", argv[1]);
 }

if (host == NULL)
 {
 printf("No address information of %s\n", argv[1]);
 exit(255);
 }

bzero(&address, sizeof(struct sockaddr_in));
address.sin_family = AF_INET;
address.sin_port = htons(PORT);
address.sin_addr = *((struct in_addr *)host->h_addr);

printf("Enter your content:");
gets(buf);
//scanf("%[^\n]\n", buf);
//strcpy(buf, argv[2]);


if (sendto(sock_fd, buf, sizeof(buf), 0, (struct sockaddr *)&address, sizeof(struct sockaddr_in)) == -1)
 {
 printf("Send message to %s error!\n", inet_ntoa(address.sin_addr));
 exit(255);
 }

if (close(sock_fd) == -1)
 {
 printf("Close file error!\n");
 exit(255);
 }

exit(0);
}