RT -Thread Studio开发环境下使用W5500做TCP客户端

首先是具备W5500芯片的驱动，参考上一篇文章

RT -Thread Studio开发环境下驱动W5500网络芯片

https://blog.csdn.net/qq_25186745/article/details/112647919

在这篇文章的基础上来继续写TCP客户端的程序

在applications文件下新建my_tcp.c文件

粘贴以下代码

#include <rtthread.h>
#include <sys/socket.h> /* 使用BSD socket，需要包含socket.h头文件 */
#include <netdb.h>
#include <string.h>
#include <finsh.h>
#define BUFSZ   1024
static const char send_data[] = "This is TCP Client from RT-Thread."; /* 发送用到的数据 */
void tcpclient(int argc, char **argv)
{
    int ret;
    char *recv_data;
    struct hostent *host;
    int sock, bytes_received;
    struct sockaddr_in server_addr;
    const char *url;
    int port;
    if (argc < 3)
    {
        rt_kprintf("Usage: tcpclient URL PORT\n");
        rt_kprintf("Like: tcpclient 192.168.12.44 5000\n");
        return ;
    }
    url = argv[1];
    port = strtoul(argv[2], 0, 10);
    /* 通过函数入口参数url获得host地址（如果是域名，会做域名解析） */
    host = gethostbyname(url);
    /* 分配用于存放接收数据的缓冲 */
    recv_data = rt_malloc(BUFSZ);
    if (recv_data == RT_NULL)
    {
        rt_kprintf("No memory\n");
        return;
    }
    /* 创建一个socket，类型是SOCKET_STREAM，TCP类型 */
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        /* 创建socket失败 */
        rt_kprintf("Socket error\n");
        /* 释放接收缓冲 */
        rt_free(recv_data);
        return;
    }
    /* 初始化预连接的服务端地址 */
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(port);
    server_addr.sin_addr = *((struct in_addr *)host->h_addr);
    rt_memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero));
    /* 连接到服务端 */
    if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
    {
        /* 连接失败 */
        rt_kprintf("Connect fail!\n");
        closesocket(sock);
        /*释放接收缓冲 */
        rt_free(recv_data);
        return;
    }
    while (1)
    {
        /* 从sock连接中接收最大BUFSZ - 1字节数据 */
        bytes_received = recv(sock, recv_data, BUFSZ - 1, 0);
        if (bytes_received < 0)
        {
            /* 接收失败，关闭这个连接 */
            closesocket(sock);
            rt_kprintf("\nreceived error,close the socket.\r\n");
            /* 释放接收缓冲 */
            rt_free(recv_data);
            break;
        }
        else if (bytes_received == 0)
        {
            /* 默认 recv 为阻塞模式，此时收到0认为连接出错，关闭这个连接 */
            closesocket(sock);
            rt_kprintf("\nreceived error,close the socket.\r\n");
            /* 释放接收缓冲 */
            rt_free(recv_data);
            break;
        }
        /* 有接收到数据，把末端清零 */
        recv_data[bytes_received] = '\0';
        if (strncmp(recv_data, "q", 1) == 0 || strncmp(recv_data, "Q", 1) == 0)
        {
            /* 如果是首字母是q或Q，关闭这个连接 */
            closesocket(sock);
            rt_kprintf("\n got a 'q' or 'Q',close the socket.\r\n");
            /* 释放接收缓冲 */
            rt_free(recv_data);
            break;
        }
        else
        {
            /* 在控制终端显示收到的数据 */
            rt_kprintf("\nReceived data = %s ", recv_data);
        }
        /* 发送数据到sock连接 */
        ret = send(sock, send_data, strlen(send_data), 0);
        if (ret < 0)
        {
            /* 接收失败，关闭这个连接 */
            closesocket(sock);
            rt_kprintf("\nsend error,close the socket.\r\n");
            rt_free(recv_data);
            break;
        }
        else if (ret == 0)
        {
            /* 打印send函数返回值为0的警告信息 */
            rt_kprintf("\n Send warning,send function return 0.\r\n");
        }
    }
    return;
}
MSH_CMD_EXPORT(tcpclient, a tcp client sample);