cJSON库的下载
cJSON是一个基于C的JSON解析库，这个库非常简单，只有cJSON.c和cJSON.h两个文件，支持JSON的解析和封装，需要调用时，只需要#include "cJSON.h"就可以使用了，
-
库源码下载地址：cJSON download
-
JSON官方网站：json
只包含键值对的JSON字符串解析
JSON字符串：
{
"name": "Andy", //键值对1
"age": 20 //键值对2
}
这个JSON对象只有两个键值对，键name对应字符串Andy，键age对应数字20。
void Parse_Str1(void)
{
char str1[] = "{"name":"Andy","age":20}";
cJSON *str1_json, *str1_name, *str1_age;
printf("str1:%s
",str1);
str1_json = cJSON_Parse(str1); //创建JSON解析对象，返回JSON格式是否正确
if (!str1_json)
{
printf("JSON格式错误:%s
", cJSON_GetErrorPtr()); //输出json格式错误信息
}
else
{
printf("JSON格式正确:
%s
",cJSON_Print(str1_json) );
str1_name = cJSON_GetObjectItem(str1_json, "name"); //获取name键对应的值的信息
if (str1_name->type == cJSON_String)
{
printf("姓名:%s
", str1_name->valuestring);
}
str1_age = cJSON_GetObjectItem(str1_json, "age"); //获取age键对应的值的信息
if(str1_age->type==cJSON_Number)
{
printf("年龄:%d
", str1_age->valueint);
}
cJSON_Delete(str1_json);//释放内存
}
}
运行结果：
包含数组的JSON字符串解析
JSON字符串：
{
"location": [{
"name": "Faye",
"address": "北京"
},
{
"name": "Andy",
"address": "香港"
}
],
"time": "2018-11-17"
}
解析函数：
void Parse_Str2(void)
{
char str2[] = "{"location":[{"name":"Faye","address":"北京"},{"name":"Andy","address":"香港"}],"time":"2018-11-17"}";
cJSON *root = 0;
cJSON *loc_json = 0;
cJSON *name1_json,*name2_json;
char *time_str, *str_tmp;
root = cJSON_Parse(str2);
if(!root)
printf("str2 JSON格式错误:%s
", cJSON_GetErrorPtr());
else
{
printf("str2 JSON格式正确:
%s
",cJSON_Print(root));
time_str = cJSON_GetObjectItem(root,"time")->valuestring;//time键值对
printf("time:%s
", time_str);
loc_json = cJSON_GetObjectItem(root,"location");
if(loc_json)
{
name1_json = cJSON_GetArrayItem(loc_json,0); //数组第0个元素
str_tmp = cJSON_GetObjectItem(name1_json, "name")->valuestring;//name键对应的值
printf("name1 is : %s
", str_tmp);
str_tmp = cJSON_GetObjectItem(name1_json, "address")->valuestring;//addr1键对应的值
printf("addr1 is : %s
", str_tmp);
name2_json = cJSON_GetArrayItem(loc_json,1); //数组第1个元素
str_tmp = cJSON_GetObjectItem(name2_json, "name")->valuestring;
printf("name2 is : %s
", str_tmp);
str_tmp = cJSON_GetObjectItem(name2_json, "address")->valuestring;
printf("addr2 is : %s
", str_tmp);
}
}
cJSON_Delete(loc_json);
}
运行结果：
北京时间JSON数据解析
api地址：
http://api.k780.com:88/?app=life.time&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json
JSON字符串：
{
"success": "1",
"result": {
"timestamp": "1543922613",
"datetime_1": "2018-12-04 19:23:33",
"datetime_2": "2018年12月04日 19时23分33秒",
"week_1": "2",
"week_2": "星期二",
"week_3": "周二",
"week_4": "Tuesday"
}
}
解析函数：
void Parse_BJ_Time(void)
{
char bj_time_str[] = "{"success":"1","result":{"timestamp":"1542456793","datetime_1":"2018-11-17 20:13:13","datetime_2":"2018年11月17日 20时13分13秒","week_1":"6","week_2":"星期六","week_3":"周六","week_4":"Saturday"}}";
cJSON *root;
cJSON *result_json;
char *datetime, *week;
root = cJSON_Parse(bj_time_str);
if(root)
{
printf("json格式正确:
%s
", cJSON_Print(root));
result_json = cJSON_GetObjectItem(root, "result"); //获取result键对应的值
if(result_json)
{
datetime = cJSON_GetObjectItem(result_json, "datetime_2")->valuestring;
printf("北京时间: %s
", datetime);
week = cJSON_GetObjectItem(result_json, "week_2")->valuestring;
printf("星期: %s
", week);
}
}
cJSON_Delete(root);
cJSON_Delete(result_json);
}
运行结果：
心知天气JSON数据解析
JSON字符串：
{
"results": [{
"location": {
"id": "WS10730EM8EV",
"name": "深圳",
"country": "CN",
"path": "深圳,深圳,广东,中国",
"timezone": "Asia/Shanghai",
"timezone_offset": "+08:00"
},
"daily": [{
"date": "2018-11-18",
"text_day": "多云",
"code_day": "4",
"text_night": "多云",
"code_night": "4",
"high": "26",
"low": "20",
"precip": "",
"wind_direction": "无持续风向",
"wind_direction_degree": "",
"wind_speed": "10",
"wind_scale": "2"
}, {
"date": "2018-11-19",
"text_day": "小雨",
"code_day": "13",
"text_night": "小雨",
"code_night": "13",
"high": "25",
"low": "20",
"precip": "",
"wind_direction": "无持续风向",
"wind_direction_degree": "",
"wind_speed": "10",
"wind_scale": "2"
}, {
"date": "2018-11-20",
"text_day": "小雨",
"code_day": "13",
"text_night": "小雨",
"code_night": "13",
"high": "25",
"low": "21",
"precip": "",
"wind_direction": "无持续风向",
"wind_direction_degree": "",
"wind_speed": "10",
"wind_scale": "2"
}],
"last_update": "2018-11-18T11:00:00+08:00"
}]
}
解析函数：
void parse_seniverse_weather(void)
{
char weather_str[] =
"{"results":[{"location":{"id":"WS10730EM8EV","name":"深圳","country":"CN","path":"深圳,深圳,广东,中国","timezone":"Asia/Shanghai","timezone_offset":"+08:00"},"daily":[{"date":"2018-11-18","text_day":"多云","code_day":"4","text_night":"多云","code_night":"4","high":"26","low":"20","precip":"","wind_direction":"无持续风向","wind_direction_degree":"","wind_speed":"10","wind_scale":"2"},{"date":"2018-11-19","text_day":"小雨","code_day":"13","text_night":"小雨","code_night":"13","high":"25","low":"20","precip":"","wind_direction":"无持续风向","wind_direction_degree":"","wind_speed":"10","wind_scale":"2"},{"date":"2018-11-20","text_day":"小雨","code_day":"13","text_night":"小雨","code_night":"13","high":"25","low":"21","precip":"","wind_direction":"无持续风向","wind_direction_degree":"","wind_speed":"10","wind_scale":"2"}],"last_update":"2018-11-18T11:00:00+08:00"}]}";
cJSON *root;
cJSON *results;
cJSON *last_update;
cJSON *loc_json, *daily_json;
cJSON *forecast_json;
char *loc_tmp, *weather_tmp, *update_tmp;
int i = 0;
root = cJSON_Parse((const char*)weather_str);
if(root)
{
// printf("JSON格式正确:
%s
",cJSON_Print(root)); //输出json字符串
results = cJSON_GetObjectItem(root, "results");
results = cJSON_GetArrayItem(results,0);
if(results)
{
loc_json = cJSON_GetObjectItem(results, "location"); //得到location键对应的值，是一个对象
loc_tmp = cJSON_GetObjectItem(loc_json, "id") -> valuestring;
printf("城市ID:%s
",loc_tmp);
loc_tmp = cJSON_GetObjectItem(loc_json, "name") -> valuestring;
printf("城市名称:%s
",loc_tmp);
loc_tmp = cJSON_GetObjectItem(loc_json, "timezone") -> valuestring;
printf("城市时区:%s
",loc_tmp);
daily_json = cJSON_GetObjectItem(results, "daily");
if(daily_json)
{
for(i = 0; i < 3; i++)
{
forecast_json = cJSON_GetArrayItem(daily_json, i);
weather_tmp = cJSON_GetObjectItem(forecast_json, "date") -> valuestring;
printf("日期:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "code_day") -> valuestring;
printf("白天天气代码:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "code_night") -> valuestring;
printf("晚上天气代码:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "high") -> valuestring;
printf("最高温度:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "low") -> valuestring;
printf("最低温度:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "wind_direction_degree") -> valuestring;
printf("风向角度:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "wind_scale") -> valuestring;
printf("风力:%s
", weather_tmp);
}
}
else
printf("daily json格式错误
");
last_update = cJSON_GetObjectItem(results, "last_update");
update_tmp = last_update->valuestring;
if(last_update)
{
printf("更新时间:%s
", update_tmp);
}
}
else
{
printf("results格式错误:%s
", cJSON_GetErrorPtr());
}
}
else
{
printf("JSON格式错误
");
}
cJSON_Delete(root);
cJSON_Delete(results);
}
运行结果：
和风天气数据解析
JSON字符串：
{
"HeWeather6": [{
"basic": {
"cid": "CN101010700",
"location": "昌平",
"parent_city": "北京",
"admin_area": "北京",
"cnty": "中国",
"lat": "40.21808624",
"lon": "116.23590851",
"tz": "+8.00"
},
"update": {
"loc": "2018-11-21 21:45",
"utc": "2018-11-21 13:45"
},
"status": "ok",
"daily_forecast": [{
"cond_code_d": "100",
"cond_code_n": "100",
"cond_txt_d": "晴",
"cond_txt_n": "晴",
"date": "2018-11-21",
"hum": "21",
"mr": "16:02",
"ms": "04:27",
"pcpn": "0.0",
"pop": "0",
"pres": "1030",
"sr": "07:08",
"ss": "16:53",
"tmp_max": "9",
"tmp_min": "-3",
"uv_index": "5",
"vis": "10",
"wind_deg": "323",
"wind_dir": "西北风",
"wind_sc": "1-2",
"wind_spd": "4"
}, {
"cond_code_d": "100",
"cond_code_n": "101",
"cond_txt_d": "晴",
"cond_txt_n": "多云",
"date": "2018-11-22",
"hum": "21",
"mr": "16:36",
"ms": "05:33",
"pcpn": "0.0",
"pop": "0",
"pres": "1030",
"sr": "07:09",
"ss": "16:52",
"tmp_max": "8",
"tmp_min": "-4",
"uv_index": "3",
"vis": "20",
"wind_deg": "35",
"wind_dir": "东北风",
"wind_sc": "1-2",
"wind_spd": "5"
}, {
"cond_code_d": "101",
"cond_code_n": "100",
"cond_txt_d": "多云",
"cond_txt_n": "晴",
"date": "2018-11-23",
"hum": "23",
"mr": "17:15",
"ms": "06:41",
"pcpn": "0.0",
"pop": "16",
"pres": "1024",
"sr": "07:10",
"ss": "16:52",
"tmp_max": "7",
"tmp_min": "-2",
"uv_index": "2",
"vis": "20",
"wind_deg": "305",
"wind_dir": "西北风",
"wind_sc": "1-2",
"wind_spd": "3"
}]
}]
}
解析函数：
//解析和风天气，格式和心知天气非常像
void parse_heweather(void)
{
char heweather_str[] = "{"HeWeather6":[{"basic":{"cid":"CN101010700","location":"昌平","parent_city":"北京","admin_area":"北京","cnty":"中国","lat":"40.21808624","lon":"116.23590851","tz":"+8.00"},"update":{"loc":"2018-11-21 21:45","utc":"2018-11-21 13:45"},"status":"ok","daily_forecast":[{"cond_code_d":"100","cond_code_n":"100","cond_txt_d":"晴","cond_txt_n":"晴","date":"2018-11-21","hum":"21","mr":"16:02","ms":"04:27","pcpn":"0.0","pop":"0","pres":"1030","sr":"07:08","ss":"16:53","tmp_max":"9","tmp_min":"-3","uv_index":"5","vis":"10","wind_deg":"323","wind_dir":"西北风","wind_sc":"1-2","wind_spd":"4"},{"cond_code_d":"100","cond_code_n":"101","cond_txt_d":"晴","cond_txt_n":"多云","date":"2018-11-22","hum":"21","mr":"16:36","ms":"05:33","pcpn":"0.0","pop":"0","pres":"1030","sr":"07:09","ss":"16:52","tmp_max":"8","tmp_min":"-4","uv_index":"3","vis":"20","wind_deg":"35","wind_dir":"东北风","wind_sc":"1-2","wind_spd":"5"},{"cond_code_d":"101","cond_code_n":"100","cond_txt_d":"多云","cond_txt_n":"晴","date":"2018-11-23","hum":"23","mr":"17:15","ms":"06:41","pcpn":"0.0","pop":"16","pres":"1024","sr":"07:10","ss":"16:52","tmp_max":"7","tmp_min":"-2","uv_index":"2","vis":"20","wind_deg":"305","wind_dir":"西北风","wind_sc":"1-2","wind_spd":"3"}]}]}";
cJSON *root;
cJSON *results;
cJSON *basic_json, *update_json, *forecast_json;
cJSON *daily_json;
int i = 0;
char *basic_tmp, *update_tmp, *status_tmp, *weather_tmp;
root = cJSON_Parse(heweather_str);
if(root)
{
results = cJSON_GetObjectItem(root, "HeWeather6"); //HeWeather键对应的值，是一个数组
results = cJSON_GetArrayItem(results,0);
if(results)
{
basic_json = cJSON_GetObjectItem(results, "basic");
if(basic_json)
{
basic_tmp = cJSON_GetObjectItem(basic_json, "cid") -> valuestring;
printf("城市ID:%s
",basic_tmp);
basic_tmp = cJSON_GetObjectItem(basic_json, "location") -> valuestring;
printf("县级市:%s
",basic_tmp);
basic_tmp = cJSON_GetObjectItem(basic_json, "parent_city") -> valuestring;
printf("地级市:%s
",basic_tmp);
basic_tmp = cJSON_GetObjectItem(basic_json, "admin_area") -> valuestring;
printf("所属省:%s
",basic_tmp);
basic_tmp = cJSON_GetObjectItem(basic_json, "lat") -> valuestring;
printf("纬度:%s
",basic_tmp);
basic_tmp = cJSON_GetObjectItem(basic_json, "lon") -> valuestring;
printf("经度:%s
",basic_tmp);
}
update_json = cJSON_GetObjectItem(results, "update");
if(update_json)
{
update_tmp = cJSON_GetObjectItem(update_json, "loc") -> valuestring;
printf("更新时间:%s(所在地时间)
", update_tmp);
update_tmp = cJSON_GetObjectItem(update_json, "utc") -> valuestring;
printf("更新时间:%s(世界时间)
", update_tmp);
}
status_tmp = cJSON_GetObjectItem(results, "status") -> valuestring;
printf("解析状态:%s
", status_tmp);
daily_json = cJSON_GetObjectItem(results, "daily_forecast");
if(daily_json)
{
for(i = 0; i < 3; i++)
{
forecast_json = cJSON_GetArrayItem(daily_json, i);
weather_tmp = cJSON_GetObjectItem(forecast_json, "date") -> valuestring;
printf("日期:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "cond_txt_d") -> valuestring;
printf("白天天气:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "cond_txt_n") -> valuestring;
printf("晚上天气:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "tmp_max") -> valuestring;
printf("最高温度:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "tmp_min") -> valuestring;
printf("最低温度:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "wind_deg") -> valuestring;
printf("风向角度:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "wind_dir") -> valuestring;
printf("风向:%s
", weather_tmp);
weather_tmp = cJSON_GetObjectItem(forecast_json, "wind_sc") -> valuestring;
printf("风力:%s
", weather_tmp);
}
}
}
}
cJSON_Delete(root);
cJSON_Delete(results);
cJSON_Delete(basic_json);
cJSON_Delete(update_json);
cJSON_Delete(forecast_json);
cJSON_Delete(daily_json);
}
运行结果：
源码下载及实用的API地址：
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