广播端代码怎么写-DPDK中文网

广播通信（Broadcast）通常用于网络编程中，将数据包发送到同一子网内的所有设备。以下是不同场景下的广播端代码示例：

1. UDP 广播发送端（C++ 示例）

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

int main() {
    // 创建 UDP socket
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd == -1) {
        perror("socket creation failed");
        return -1;
    }

    // 设置广播权限
    int broadcastEnable = 1;
    if (setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &broadcastEnable, sizeof(broadcastEnable)) == -1) {
        perror("setsockopt failed");
        close(sockfd);
        return -1;
    }

    // 目标地址（广播地址）
    struct sockaddr_in destAddr;
    memset(&destAddr, 0, sizeof(destAddr));
    destAddr.sin_family = AF_INET;
    destAddr.sin_port = htons(8888);  // 目标端口
    destAddr.sin_addr.s_addr = inet_addr("255.255.255.255"); // IPv4 广播地址

    // 发送数据
    const char* message = "Hello Broadcast!";
    if (sendto(sockfd, message, strlen(message), 0,
               (struct sockaddr*)&destAddr, sizeof(destAddr)) == -1) {
        perror("sendto failed");
        close(sockfd);
        return -1;
    }

    std::cout << "Broadcast message sent." << std::endl;
    
close(sockfd);
return 0;
}

2. Python UDP 广播发送端

import socket

# 创建 UDP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)

# 目标地址和端口
dest_addr = ("255.255.255.255", 8888)

# 发送数据
message = b"Hello Broadcast!"
sock.sendto(message, dest_addr)
print("Broadcast message sent.")

sock.close()