ESP8266 SDK 2.0 学习记录8

最新推荐文章于 2025-09-11 17:27:12 发布

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本文介绍了一种使用ESP8266芯片模拟HTTP客户端访问百度的过程。通过代码实现了域名解析、建立TCP连接、发送HTTP请求及接收响应等功能，详细展示了HTTP通信流程。

HTTP客户端

html:超文本标记协议

http:超文本文档传输协议

url:统一资源定位符

功能分析:

模拟Http协议,访问百度 http://www.baidu.com/index.html

串口打印出百度返回的信息

http服务器通讯过程模拟,加深理解http的交互过程

网而显示百度页面,这样就在本地模拟了一下http的通讯过程.

实现过程

实现代码

const char GetStr[] = "GET /index.html HTTP/1.1\r\n"
"Host: www.baidu.com\r\n"
"\r\n";
#define HTTP_RCV_LEN 50000

void ATaskHttpClient(void *pvParameters)
{
    int iVariableExample = 0;
    int fd = -1;
    int NetTimerOut = 5000;
    int ret, i;
    struct sockaddr_in serverAddr;
    char *Httpmsg;
    struct hostent *phostent;
    char *ipaddr = NULL;
    STATION_STATUS StaStatus;

    do
    {
        StaStatus = wifi_station_get_connect_status();
        vTaskDelay(100);
    } while (StaStatus != STATION_GOT_IP);

    fd = socket(PF_INET, SOCK_STREAM, 0);
    if (fd == -1)
    {
        printf("get socket fail!\n");
        vTaskDelete(NULL);
        return;
    }

    setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &NetTimerOut, sizeof(int));

    /*添加获取域名*/
    phostent = gethostbyname("www.baidu.com");
    if(phostent == NULL)
    {
        printf("get host ip fail!\n");
        vTaskDelete(NULL);
        return;
    }
    else
    {
        for(i=0; phostent->h_addr_list[i]; i++)
        {
            ipaddr = inet_ntoa(*(struct in_addr *)(phostent->h_addr_list[i]));
            if(ipaddr != NULL)
            {
                printf("host addr is: %s\n", ipaddr);
                break;
            }
        }
        if(ipaddr == NULL)
        {
            printf("error:get ip fail!\n");
            vTaskDelete(NULL);
            return;
        }
    }
    memset(&serverAddr, 0, sizeof(serverAddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = inet_addr(ipaddr);
    serverAddr.sin_port = htons(80);
    serverAddr.sin_len = sizeof(serverAddr);

    //连接到服务端
    do
    {
        /* code */
        ret = connect(fd, (struct sockaddr *)&serverAddr, serverAddr.sin_len);
        if (ret != 0)
        {
            printf("Connect is fail!\n");
            vTaskDelay(100);
        }
    } while (ret != 0);

    Httpmsg = zalloc(HTTP_RCV_LEN);
    send(fd, GetStr, strlen(GetStr), 0);

    for (;;)
    {
        do
        {
            ret = recv(fd, Httpmsg, HTTP_RCV_LEN, 0);
            if (ret > 0)
            {
                printf("HttpServer:%s\n", Httpmsg);
            }
            else
            {
                printf("HttpServer data is no!\n");
                /* code */
            }
            vTaskDelay(100);

        } while (ret == -1);
    }
    free(Httpmsg);
    vTaskDelete(NULL);
}

void HttpClient_int(void)
{
    xTaskCreate(ATaskHttpClient, "Httpclient", 256, NULL, 4, NULL);
}

串口数据