c++的udp通信代码
时间: 2023-08-01 12:07:57 浏览: 49
以下是一个简单的UDP通信的客户端和服务器端的代码示例,使用C++语言实现:
服务器端代码:
```c++
#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
using namespace std;
int main() {
int server_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (server_socket < 0) {
cout << "创建套接字失败!" << endl;
return -1;
}
struct sockaddr_in server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(8888);
if (bind(server_socket, (struct sockaddr*) &server_addr, sizeof(server_addr)) < 0) {
cout << "绑定套接字失败!" << endl;
close(server_socket);
return -1;
}
cout << "服务器已启动,等待客户端连接..." << endl;
while (true) {
char buffer[1024];
struct sockaddr_in client_addr;
socklen_t len = sizeof(client_addr);
// 接收数据
memset(buffer, 0, sizeof(buffer));
int recv_len = recvfrom(server_socket, buffer, sizeof(buffer), 0, (struct sockaddr*) &client_addr, &len);
if (recv_len < 0) {
cout << "接收数据失败!" << endl;
continue;
}
cout << "接收到来自客户端" << inet_ntoa(client_addr.sin_addr) << "的数据:" << buffer << endl;
// 发送数据
const char* response = "已成功接收到你的数据,谢谢!";
int send_len = sendto(server_socket, response, strlen(response), 0, (struct sockaddr*) &client_addr, len);
if (send_len < 0) {
cout << "发送数据失败!" << endl;
continue;
}
}
close(server_socket);
return 0;
}
```
客户端代码:
```c++
#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
using namespace std;
int main() {
int client_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (client_socket < 0) {
cout << "创建套接字失败!" << endl;
return -1;
}
struct sockaddr_in server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
server_addr.sin_port = htons(8888);
// 发送数据
const char* message = "你好,服务器!";
int send_len = sendto(client_socket, message, strlen(message), 0, (struct sockaddr*) &server_addr, sizeof(server_addr));
if (send_len < 0) {
cout << "发送数据失败!" << endl;
close(client_socket);
return -1;
}
// 接收数据
char buffer[1024];
memset(buffer, 0, sizeof(buffer));
int recv_len = recvfrom(client_socket, buffer, sizeof(buffer), 0, NULL, NULL);
if (recv_len < 0) {
cout << "接收数据失败!" << endl;
close(client_socket);
return -1;
}
cout << "接收到来自服务器的数据:" << buffer << endl;
close(client_socket);
return 0;
}
```
说明:
- 服务器端使用`socket()`函数创建一个UDP套接字,并使用`bind()`函数将其绑定到指定的IP地址和端口号上。
- 服务器端使用`recvfrom()`函数接收客户端发送过来的数据,并使用`sendto()`函数将响应数据发送给客户端。
- 客户端使用`socket()`函数创建一个UDP套接字,并使用`sendto()`函数将数据发送给服务器端。
- 客户端使用`recvfrom()`函数接收服务器端发送过来的响应数据。