目录

1 send.cpp

2 receive.cpp

3 编译运行

4 测试

---

1 send.cpp

#include <iostream>
#include <string>
#include <cstring>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h> // 添加这个头文件
#include <thread>

void sendData() {
    int sockfd;
    struct sockaddr_in serverAddr;

    // 创建UDP socket
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        std::cerr << "Failed to create socket" << std::endl;
        return;
    }

    // 设置服务器地址和端口
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(12345);
    serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    while (true) {
        // 发送数据
        std::string message = "Hello, UDP!";
        sendto(sockfd, message.c_str(), message.length(), 0, (struct sockaddr*)&serverAddr, sizeof(serverAddr));
        std::cout << "Sent: " << message << std::endl;
        sleep(1); // 每秒发送一次
    }

    close(sockfd);
}

int main() {
    std::thread sender(sendData);
    sender.join(); // 等待发送线程结束

    return 0;
}

2 receive.cpp

#include <iostream>
#include <string>
#include <cstring>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <thread>

void receiveData() {
    int sockfd;
    struct sockaddr_in serverAddr, clientAddr;
    socklen_t addrLen = sizeof(clientAddr);
    char buffer[1024];

    // 创建UDP socket
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        std::cerr << "Failed to create socket" << std::endl;
        return;
    }

    // 设置服务器地址和端口
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(12345);
    serverAddr.sin_addr.s_addr = INADDR_ANY;

    // 绑定地址和端口
    bind(sockfd, (struct sockaddr*)&serverAddr, sizeof(serverAddr));

    while (true) {
        // 接收数据
        int bytesReceived = recvfrom(sockfd, buffer, 1024, 0, (struct sockaddr*)&clientAddr, &addrLen);
        buffer[bytesReceived] = '\0';
        std::cout << "Received: " << buffer << std::endl;
    }

    close(sockfd);
}

int main() {
    std::thread receiver(receiveData);
    receiver.join(); // 等待接收线程结束

    return 0;
}

3 编译运行

g++ -o receive_test receive.cpp  -lpthread
g++ -o send_test send.cpp -lpthread

4 测试

直接把板子连接到我家的电视上，

参考文献：C++怎么实现udp发送和接收-开发者知识库平台 - 辰迅云