websocket监听client消息，监听到json会给client回一个json

最新推荐文章于 2024-04-29 17:25:49 发布

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最新推荐文章于 2024-04-29 17:25:49 发布

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分类专栏：媒体流文章标签： websocket json 单片机

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本文详细描述了一个使用C语言编写的UDP服务器程序，它监听0.0.0.0:1234，接收客户端数据，根据接收到的首字符q退出，同时回复Hellofromserver!。

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#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define BUF_SIZE 1024

int main()
{
    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0)
    {
        printf("Failed to create socket\n");
        return 1;
    }

    // bind socket
    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(1234);
    if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
    {
        printf("Failed to bind socket\n");
        close(sock);
        return 1;
    }

    printf("Listening to data on 0.0.0.0:1234\n");

    // receive UDP 数据包 and send msg
    char buf[BUF_SIZE] = {0};
    struct sockaddr_in client_addr;
    socklen_t len = sizeof(client_addr);
    while (true)
    {
        int n = recvfrom(sock, buf, BUF_SIZE - 1, 0, (struct sockaddr *)&client_addr, &len);

        if (n < 0)
        {
            printf("Failed to receive data\n");
            continue;
        }
        printf("Message content: %s\n", buf);
        if (buf[0] == 'q')
        {
            printf("Exiting...\n");
            break;
        }

        buf[n] = '\0';

        char ip[INET_ADDRSTRLEN];
        memset(ip, 0, sizeof(ip));
        inet_ntop(AF_INET, &(client_addr.sin_addr), ip, INET_ADDRSTRLEN);
        printf("Server listening on [%s:%d]\n", ip, ntohs(server_addr.sin_port));

        const char *reply = "Hello from server!";
        if (sendto(sock, reply, strlen(reply), 0, (struct sockaddr *)&client_addr, sizeof(client_addr)) < 0)
        {
            printf("Failed to send reply\n");
            continue;
        }
        printf("Reply sent!\n");
    }

    // cleanup source
    close(sock);
    return 0;
}