【平头哥RVB2601开发板试用体验】基于HTTPClient的云语音识别

前言


源码解析


http_client_config_t config = {
    .url = "http://httpbin.org/get",
    .event_handler = _http_event_handler,
};
http_client_handle_t client = http_client_init(&config);
​
const char *post_data = "field1=value1&field2=value2";
http_client_set_method(client, HTTP_METHOD_POST);
http_client_set_post_field(client, post_data, strlen(post_data));
err = http_client_perform(client);
if (err == HTTP_CLI_OK) {
    LOGI(TAG, "HTTP POST Status = %d, content_length = %d rn",
            http_client_get_status_code(client),
            http_client_get_content_length(client));
} else {
    LOGE(TAG, "HTTP POST request failed: 0x%x @#@@@@@@", (err));
    e_count ++;
}




web_err_t http_client_set_post_field(http_client_handle_t client, const char *data, int len)
{
    web_err_t err = WEB_OK;
    client->post_data = (char *)data;   // 待发送数据指针
    client->post_len = len;             // 待发送数据长度
    LOGD(TAG, "set post file length = %d", len);
    // 如果此前没有设置 Content-Type，则设置为 application/x-www-form-urlencoded
    if (client->post_data)
    {
        char *value = NULL;
        if ((err = http_client_get_header(client, "Content-Type", &value)) != WEB_OK)
        {
            return err;
        }
        if (value == NULL)
        {
            err = http_client_set_header(client, "Content-Type", "application/x-www-form-urlencoded");
        }
    }
    else
    {
        client->post_len = 0;
        err = http_client_set_header(client, "Content-Type", NULL);
    }
    return err;
}


http_client_prepare();
http_client_connect();
http_client_request_send();
http_client_send_post_data();
http_client_fetch_headers();
http_check_response();
http_client_get_data();
http_client_close();
static web_err_t http_client_send_post_data(http_client_handle_t client)
{   
    // 此时请求头应发送完毕
    if (client->state != HTTP_STATE_REQ_COMPLETE_HEADER)
    {
        LOGE(TAG, "Invalid state");
        return WEB_ERR_INVALID_STATE;
    }
    // 没有要发送的 post_data 直接返回（包括其它请求）
    if (!(client->post_data && client->post_len))
    {
        goto success;
    }
​
    // 发送 post_data
    int wret = http_client_write(client, client->post_data + client->data_written_index, client->data_write_left);
    if (wret < 0)
    {
        return wret;
    }
    // 在 request send 里面 data_write_left 最后被赋值为 post_len
    client->data_write_left -= wret;
    // 在 request send 里面 data_written_index 最后被赋值为 0
    client->data_written_index += wret;
​
    // 发送完毕
    if (client->data_write_left <= 0)
    {
        goto success;
    }
    else
    {
        return ERR_HTTP_WRITE_DATA;
    }
​
success:
    // 更新状态
    client->state = HTTP_STATE_REQ_COMPLETE_DATA;
    return WEB_OK;
}






文章转载自：平头哥芯片开放社区 作者：哈猪猪