#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc, char **argv)
{
struct sockaddr_in s_addr;
struct sockaddr_in c_addr;
int sock;
socklen_t addr_len;
int len;
char buff[128];
/* 创建socket */
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
perror("socket");
exit(errno);
} else
printf("create socket.\n\r");
memset(&s_addr, 0, sizeof(struct sockaddr_in));
/* 设置IP和端口 */
s_addr.sin_family = AF_INET;
s_addr.sin_port = htons(7838);
s_addr.sin_addr.s_addr = INADDR_ANY;
/* 绑定IP和端口 */
if ((bind(sock, (struct sockaddr *) &s_addr, sizeof(s_addr))) == -1) {
perror("bind");
exit(errno);
} else
printf("bind address to socket.\n\r");
/* 循环接收数据 */
addr_len = sizeof(c_addr);
while (1) {
bzero( buff, sizeof(buff) );
len = recvfrom(sock, buff, sizeof(buff) - 1, 0,
(struct sockaddr *) &c_addr, &addr_len);
if (len < 0) {
perror("recvfrom");
exit(errno);
}
buff[len] = '\0';
printf("recevied from % : %d : %s\n\r",
inet_ntoa(c_addr.sin_addr), ntohs(c_addr.sin_port), buff);
}
return 0;
}[/code]客户端源代码：[code]
#include
#include
#include
#include
#include
#include
#include
#include
int main(int argc, char **argv)
{
struct sockaddr_in s_addr;
int sock;
int addr_len;
int len;
char buff[128];
int yes;
/* 创建socket */
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
perror("socket");
exit(errno);
} else
printf("create socket.\n\r");
/* 设置广播 */
yes = 1;
setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes));
/* 设置IP和端口 */
s_addr.sin_family = AF_INET;
s_addr.sin_port = htons(7838);
if (argv[1])
s_addr.sin_addr.s_addr = inet_addr(argv[1]);
else {
printf("must \n");
exit(0);
}
/* 发送UDP消息 */
addr_len = sizeof(s_addr);
strcpy(buff, "hello i'm here");
len = sendto(sock, buff, strlen(buff), 0,
(struct sockaddr *) &s_addr, addr_len);
if (len < 0) {
printf("\n\rsend error.\n\r");
return 3;
}
printf("send success.\n\r");
return 0;
}
[/code]编译：gcc ser.c -o ser
gcc cli.c -o cli
一个终端运行：./ser 192.168.0.100 7838
显示：create socket.
bind address to socket.
另一个终端运行：./cli 192.168.0.255 7838
显示：create socket.
send success.
此时服务器终端显示：段错误
qinshunfu 于 2012-04-10 17:00:16发表:
执行过程没有必要加端口号
于 2012-03-27 11:56:30发表:
服务器端的printf（）语句有误，参数不匹配， %s %d %s打印三个参数
iuears 于 2011-03-08 08:40:08发表:
不懂，帮顶