Qt 天气预报
通过调用天气服务器接口来获取天气信息，随后对获取到的json格式信息进行提取和转换
这里给出一个获取天气服务器的接口：http://wthrcdn.etouch.cn/weather_mini?city=
运行结果如下：
获取信息功能实现：
weather.cpp:
#include "weather.h"
Weather::Weather(QObject *parent) : QObject(parent)
{
manager = new QNetworkAccessManager(this); //新建QNetworkAccessManager对象
connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));//关联信号和槽
}
Weather::Weather(QString cityName)
{
manager = new QNetworkAccessManager(this); //新建QNetworkAccessManager对象
connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));//关联信号和槽
this->CityName=cityName;
refresh();
}
void Weather::refresh()
{
this->TemperMax.clear();
this->currentTemper.clear();
this->Wind.clear();
this->WeatherType.clear();
this->Fever.clear();
this->allInfo.clear();
queryWeather();
dataMap.clear();//刷新的清空，待获取时在加载
}
void Weather::queryWeather()
{
char request[256]="http://wthrcdn.etouch.cn/weather_mini?city="; //"http://wthrcdn.etouch.cn/weather_mini?city="为天气服务器接口
QNetworkRequest quest;
sprintf(request,"%s%s",request,CityName.toUtf8().data());
quest.setUrl(QUrl(request));
quest.setHeader(QNetworkRequest::UserAgentHeader,"RT-Thread ART");
manager->get(quest);
}
//Json文件 例：合肥
//QJsonDocument({"data":{"city":"合肥",
// "forecast":[{"date":"27日星期四","fengli":"",
// "fengxiang":"西北风","high":"高温 29℃","low":"低温 21℃","type":"多云"},
// {"date":"28日星期五","fengli":"","fengxiang":"北风","high":"高温 30℃","low":"低温 21℃","type":"多云"}
// ,{"date":"29日星期六","fengli":"","fengxiang":"东北风","high":"高温 32℃","low":"低温 24℃","type":"多云"},
// {"date":"30日星期天","fengli":"","fengxiang":"东北风","high":"高温 31℃","low":"低温 23℃","type":"小雨"},
// {"date":"31日星期一","fengli":"","fengxiang":"东北风","high":"高温 29℃","low":"低温 22℃","type":"小雨"}],
// "ganmao":"感冒低发期，天气舒适，请注意多吃蔬菜水果，多喝水哦。","wendu":"25","yesterday":{"date":"26日星期三",
// "fl":"","fx":"西北风","high":"高温 30℃","low":"低温 24℃","type":"中雨"}},"desc":"OK","status":1000})
QMap<QString, QMap<QString, QString> > Weather::getDataMap(bool *ok)
{
bool Oktemp;
if(ok==nullptr)
{
ok=&Oktemp;
}
if(!this->dataMap.isEmpty())
{
*ok=true;
return this->dataMap;
}
*ok=false;
if(!this->isGetData) //是否成功获取数据
return this->dataMap;
QJsonParseError err;
QJsonDocument json_recv=QJsonDocument::fromJson(allInfo.toUtf8(),&err); //解析json对象
if(!json_recv.isNull())
{
QJsonObject object=json_recv.object();
if(object.contains("data"))
{
QJsonValue value=object.value("data"); //获取指定key对应的value
if(value.isObject())
{
QJsonObject object_data=value.toObject();
if(object_data.contains("yesterday")&&object_data.contains("forecast")) //若存在昨日或与预测天气则加载所有数据
{
QJsonValue value=object_data.value("yesterday");
if(value.isObject())
{
QMap<QString,QString>mapvalue;
mapvalue["high"]=value.toObject().value("high").toString();
mapvalue["low"]=value.toObject().value("low").toString();
mapvalue["fengxiang"]=value.toObject().value("fx").toString();
mapvalue["fengli"]=value.toObject().value("fl").toString();
mapvalue["type"]=value.toObject().value("type").toString();
dataMap[value.toObject().value("date").toString()]=mapvalue;
}
value=object_data.value("forecast");
if(value.isArray())
{
QJsonArray valueArray=value.toArray();
for(int i=0;i<valueArray.count();i++)
{
QJsonObject object=valueArray.at(i).toObject();
QMap<QString,QString>mapvalue;
mapvalue["high"]=object.value("high").toString();
mapvalue["low"]=object.value("low").toString();
mapvalue["fengxiang"]=object.value("fengxiang").toString();
mapvalue["fengli"]=object.value("fengli").toString();
mapvalue["type"]=object.value("type").toString();
dataMap[object.value("date").toString()]=mapvalue;
}
*ok=true;
return dataMap;
}
}
}
}
}
return dataMap;
}
void Weather::replyFinished(QNetworkReply *reply) //刷新的槽
{
this->isGetData=false;
allInfo=reply->readAll();
QJsonParseError err;
QJsonDocument json_recv=QJsonDocument::fromJson(allInfo.toUtf8(),&err); //解析json对象
if(!json_recv.isNull())
{
QJsonObject object=json_recv.object();
if(object.contains("data"))
{
QJsonValue value=object.value("data"); //获取指定key对应的value
if(value.isObject())
{
QJsonObject object_data=value.toObject();
this->CityName=object_data.value("city").toString();
this->currentTemper=object_data.value("wendu").toString();
this->Fever=object_data.value("ganmao").toString();
if(object_data.contains("forecast"))
{
QJsonValue value=object_data.value("forecast");
if(value.isArray())
{
QJsonObject today_weather=value.toArray().at(0).toObject();
WeatherType=today_weather.value("type").toString();
currentDate=today_weather.value("date").toString();
QString low=today_weather.value("low").toString();
QString high=today_weather.value("high").toString();
TemperMax=low.mid(low.length()-3,4)+"-"+high.mid(high.length()-3,4);
QString windStrength=today_weather.value("fengli").toString();
windStrength.remove(0,8);
windStrength.remove(windStrength.length()-2,2);
Wind=today_weather.value("fengxiang").toString()+windStrength;
this->isGetData=true;
}
}
}
}
}
reply->deleteLater();
if(isGetData)
{
emit this->getDataSuccessedSignal();
}
else
{
emit this->getDataFailedSignal();
}
emit this->getDataFinisedSignal();
}
QString Weather::getAllInfo()
{
return this->allInfo;
}
void Weather::setCityName(QString city)
{
this->CityName=city;
}
QString Weather::GetCityName()
{
return this->CityName;
}
QString Weather::GetDate()
{
return this->currentDate;
}
QString Weather::GetTemperature()
{
return this->currentTemper;
}
QString Weather::GetTemperatureMax()
{
return this->TemperMax;
}
QString Weather::GetWind()
{
return this->Wind;
}
QString Weather::GetFluenza()
{
return this->Fever;
}
QString Weather::GetWeatherType()
{
return this->WeatherType;
}
weather.h:
#ifndef WEATHER_H
#define WEATHER_H
#include