学习笔记ESP32——心智天气获取和解析

一、获取心知天气函数

 把其中的密钥改成自己注册的

char* xinzhi_task(char * city_str)
{
    int8_t return_res = 1;
    char* weather_buffer = NULL;
    int content_length = 0;

    char city_temp[] = {"http://api.seniverse.com/v3/weather/now.json?key=SuipJRRw3EKYIeK2Mg&location=                                          &language=zh-Hans&unit=c"};
    //char *url_str = utf8_url_encode((const char *)city_str);
    //free(city_str);
    sprintf( city_temp, "http://api.seniverse.com/v3/weather/now.json?key=SuipJRRw3EKYIeK2M&location=%s&language=zh-Hans&unit=c", "shanghai");
    //free(url_str);
    ESP_LOGI(TAG, "待打开的url  \r\n%s\r\n",  city_temp);
    esp_http_client_config_t config = 
    {
        .event_handler = _http_event_handler,
        .url = city_temp,
    };
    esp_http_client_handle_t client = esp_http_client_init(&config);

    if( client == NULL )
    {
        return NULL;
    }

    // GET Request
    esp_http_client_set_method(client, HTTP_METHOD_GET);
    esp_err_t err = esp_http_client_open(client, 0);
    if (return_res && err != ESP_OK) 
    {
        ESP_LOGE(TAG, "Failed to open HTTP connection: %s", esp_err_to_name(err));
        return_res = 0;
    } 
    else 
    {
        content_length = esp_http_client_fetch_headers(client);     //获取到之后要读的长度
        if (content_length < 0) 
        {
            ESP_LOGE(TAG, "HTTP client fetch headers failed");
            return_res = 0;
        } else 
        {
            weather_buffer = malloc(content_length);        //malloc方式分配存储空间
            memset(weather_