C++ 高效率udp接收代码

以下是一个高效率的UDP接收代码示例：

#include <iostream>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

#define PORT 12345
#define BUFFER_SIZE 1024

int main() {
    int sockfd;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_addr_len;
    char buffer[BUFFER_SIZE];

    // 创建UDP socket
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        std::cerr << "Failed to create socket." << std::endl;
        return -1;
    }

    // 设置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = INADDR_ANY;

    // 绑定服务器地址到socket
    if (bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        std::cerr << "Failed to bind socket." << std::endl;
        close(sockfd);
        return -1;
    }

    std::cout << "Server started, listening on port " << PORT << std::endl;

    while (true) {
        // 接收数据
        ssize_t recv_len = recvfrom(sockfd, buffer, BUFFER_SIZE, 0, (struct sockaddr*)&client_addr, &client_addr_len);
        if (recv_len < 0) {
            std::cerr << "Failed to receive data." << std::endl;
            continue;
        }

        // 打印接收到的数据
        std::cout << "Received data from " << inet_ntoa(client_addr.sin_addr) << ":" << ntohs(client_addr.sin_port) << std::endl;
        std::cout.write(buffer, recv_len);
        std::cout << std::endl;
    }

    // 关闭socket
    close(sockfd);

    return 0;
}

该代码创建了一个UDP socket，并绑定到指定的端口上。然后使用循环不断接收数据，并打印接收到的数据。你可以根据需要修改代码中的端口号和缓冲区大小