天气预报API_01

天气预报API

聚合API

https://www.juhe.cn/docs

注册个人账号,实名认证后每天有100次免费请求额度。免费API中包括天气预报、新闻头条、笑话大全、万年历等。

聚合API

天气预报API

https://www.juhe.cn/docs/api/id/73

接口地址:http://apis.juhe.cn/simpleWeather/query

返回格式:json

请求方式:http get/post

请求示例:http://apis.juhe.cn/simpleWeather/query?city=%E8%8B%8F%E5%B7%9E&key=

接口备注:通过城市名称或城市ID查询天气预报情况

请求参数说明:

名称 必填 类型 说明
city string 要查询的城市名称/id,城市名称如:温州、上海、北京,需要utf8 urlencode
key string 在个人中心->我的数据,接口名称上方查看

返回参数说明:

名称 类型 说明
error_code int 返回码,0为查询成功
reason string 返回说明
result string 返回结果集
- - -
realtime - 当前天气详情情况
info string 天气情况,如:晴、多云
wid string 天气标识id,可参考小接口2
temperature string 温度,可能为空
humidity string 湿度,可能为空
direct string 风向,可能为空
power string 风力,可能为空
aqi string 空气质量指数,可能为空
- - -
future - 近5天天气情况
date string 日期
temperature string 温度,最低温/最高温
weather string 天气情况
direct string 风向

JSON返回示例:

{
    "reason": "查询成功",
    "result": {
        "city": "苏州",
        "realtime": {
            "temperature": "4",
            "humidity": "82",
            "info": "阴",
            "wid": "02",
            "direct": "西北风",
            "power": "3级",
            "aqi": "80"
        },
        "future": [
            {
                "date": "2019-02-22",
                "temperature": "1/7℃",
                "weather": "小雨转多云",
                "wid": {
                    "day": "07",
                    "night": "01"
                },
                "direct": "北风转西北风"
            },
            {
                "date": "2019-02-23",
                "temperature": "2/11℃",
                "weather": "多云转阴",
                "wid": {
                    "day": "01",
                    "night": "02"
                },
                "direct": "北风转东北风"
            },
            {
                "date": "2019-02-24",
                "temperature": "6/12℃",
                "weather": "多云",
                "wid": {
                    "day": "01",
                    "night": "01"
                },
                "direct": "东北风转北风"
            },
            {
                "date": "2019-02-25",
                "temperature": "5/12℃",
                "weather": "小雨转多云",
                "wid": {
                    "day": "07",
                    "night": "01"
                },
                "direct": "东北风"
            },
            {
                "date": "2019-02-26",
                "temperature": "5/11℃",
                "weather": "多云转小雨",
                "wid": {
                    "day": "01",
                    "night": "07"
                },
                "direct": "东北风"
            }
        ]
    },
    "error_code": 0
}

Linux下通过C获取天气

通过curl命令进行http get请求,并使用cJSON库解析返回结果

cJSON库:https://sourceforge.net/projects/cjson/

weather.c

#include 
#include 
#include "include.h"

//!!!使用时请换成自己的KEY
#define API_KEY "自己的KEY"
//输出菜单
int menu();
//请求对应城市的天气
int simpleWeather(int cityIndex);


enum{
    BEJING = 0,
    SHANGHAI = 1,
    FUZHOU = 2,
    SHENZHENG = 3,

    CITY_COUNT,
};

char *city[CITY_COUNT] = {
    "北京",
    "上海",
    "福州",
    "深圳"
};

int main(int argc, char const *argv[])
{
    int input = 0;

    while (1)
    {
        menu();

        scanf("%d", &input);

        switch (input)
        {
        case 1:
            //printf("北京\n");
            simpleWeather(BEJING);
            break;
        case 2:
            //printf("上海\n");
            simpleWeather(SHANGHAI);
            break;
        case 3:
            //printf("福州\n");
            simpleWeather(FUZHOU);
            break;
        default:
            printf("未知菜单,程序退出\n");
            return 0;
        }
    }

    return 0;
}

int menu()
{
    printf("天气预报\n");
    printf("1.北京\n");
    printf("2.上海\n");
    printf("3.福州\n");
    printf("输入序号获取天气:\n");

    return 0;
}


int simpleWeather(int cityIndex)
{
    if(cityIndex >= CITY_COUNT){
        printf("查询不到城市数据!\n");
        return 0;
    }
    printf("查询城市 :%s\n", city[cityIndex]);

    char cmd[MAX_LEN] = {0};
    char result[RESULT_BUF_LEN] = {0};
    //生成API请求url
    sprintf(cmd, "curl -s \"http://apis.juhe.cn/simpleWeather/query?city=%s&key=%s\"", city[cityIndex], API_KEY);

    
    popenCmd(cmd, result);
    //printf("result :%s\n", result);

    cJSON * root = NULL;
    cJSON * api_result = NULL, *api_realtime = NULL;
    root = cJSON_Parse(result);
    if(NULL == root){
        printf("解析json数据失败!\n");
        return -1;
    }

    //先查找result
    api_result = cJSON_GetObjectItem(root, "result");
    //再查找realtime
    api_realtime = cJSON_GetObjectItem(api_result, "realtime");
    
    //printf("%s\n", cJSON_Print(api_realtime));
    /*
    "realtime": {
        "temperature":  "30",
        "humidity": "48",
        "info": "阴",
        "wid":  "02",
        "direct":   "南风",
        "power":    "2级",
        "aqi":  "65"
    }
    */
    cJSON *temp = cJSON_GetObjectItem(api_realtime, "temperature");
    cJSON *humidity = cJSON_GetObjectItem(api_realtime, "humidity");
    cJSON *info = cJSON_GetObjectItem(api_realtime, "info");
    cJSON *direct = cJSON_GetObjectItem(api_realtime, "direct");
    printf("温度:%s度\n", temp->valuestring);
    printf("湿度:%s度\n", humidity->valuestring);
    printf("天气:%s\n", info->valuestring);
    printf("风向:%s\n", direct->valuestring);

    


    return 0;
}



tools.c

目前读取popen结果使用最大缓存102400,最好修改代码将缓存改小,重复读取。

#include 
#include "include.h"

int popenCmd(char *cmd, char *result)
{
    //运行命令,将结果保存到results

    FILE *fp = popen(cmd, "r");
    if (NULL == fp)
    {
        printf("打开 file命令失败\n");
        goto err;
    }

    //将结果读取到results字符串数组中
    fgets(result, RESULT_BUF_LEN, fp);
    if (fp)
    {
        pclose(fp);
        fp = NULL;
    }

    return 0;

err:

    if (fp)
    {
        pclose(fp);
        fp = NULL;
    }

    return -1;
}

include.h

#include "cJSON.h"

#define MAX_LEN 256
#define RESULT_BUF_LEN 102400



//执行命令,将命令结果保存到result
int popenCmd(char *cmd, char *result);
#编译命令:
gcc weather.c cJSON.c tools.c -lm -o weather
./weather

#输入结果:
天气预报
1.北京
2.上海
3.福州
输入序号获取天气:
1
查询城市 :北京
温度:25度
湿度:82度
天气:多云
风向:东北风

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