1. 源码
UDP服务端：
/**
* @brief UDP服务端
* @author Mculover666
* @date 2020/04/15
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char* argv[])
{
int server_sock_fd;
struct sockaddr_in server_addr, client_addr;
char recv_buf[100];
int nbytes = 0;
socklen_t len = 0;
/* 创建Server Socket */
server_sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (server_sock_fd < 0)
{
printf("服务端Socket创建失败");
return -1;
}
printf("服务端Socket创建成功\n");
/* 绑定ip和端口 */
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(atoi(argv[1]));//指定端口号
bind(server_sock_fd, (struct sockaddr *) &server_addr, sizeof(server_addr));
printf("服务端Socket绑定成功\n");
while(1)
{
/* 接收UDP客户端的数据 */
printf("等待接收客户端数据：\n");
len = sizeof(client_addr);
nbytes = recvfrom(server_sock_fd, recv_buf, 100, 0, (struct sockaddr *)&client_addr, &len);
printf("ok\n");
recv_buf[nbytes] = '\0';
printf("recv %d bytes:%s.\n", nbytes, recv_buf);
//接收用户输入，发送给客户端
printf("请输入要发送给客户端的数据:");
fgets(recv_buf, 100, stdin);
sendto(server_sock_fd,recv_buf,strlen(recv_buf),0,(struct sockaddr *)&client_addr,len);
}
return 0;
}
UDP客户端：
/**
* @brief UDP客户端程序
* @author Mculover666
* @date 2020/04/15
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char* argv[])
{
int sock_fd;
struct sockaddr_in server_addr;
char recv_buf[100];
int nbytes = 0;
socklen_t len = 0;
/* 创建Socket */
sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (sock_fd < 0)
{
printf("客户端Socket创建失败");
return -1;
}
/* 绑定ip和端口 */
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr(argv[1]);
server_addr.sin_port = htons(atoi(argv[2]));//指定端口号
while(1)
{
len = sizeof(server_addr);
//接收用户输入，发送给服务端
printf("请输入要发送给服务端的数据:");
fgets(recv_buf, 100, stdin);
sendto(sock_fd,recv_buf,100,0,(struct sockaddr *)(&server_addr),len);
/* 接收UDP客户端的数据 */
len = sizeof(server_addr);
nbytes = recvfrom(sock_fd, recv_buf, 100, 0, (struct sockaddr *)&server_addr, &len);
recv_buf[nbytes] = '\0';
printf("recv %d bytes:%s.\n", nbytes, recv_buf);
}
return 0;
}
2. 在本机运行结果
编译：
gcc server.c -o srever_wangshiwei.o gcc client.c -o client_wangshiwei.o
运行：
3. 在开发板与PC之间运行结果
编译：
gcc server.c -o srever_wangshiwei.o arm-linux-gnueabi-gcc client.c -o clientARM_wangshiwei.o
