#QT项目实战（天气预报）

1.IDE：QTCreator

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2.实验：

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3.记录：

（1）调用API的Url

a.调用API获取IP

whois.pconline.com.cn/ipJson.jsp?iphttp://whois.pconline.com.cn/ipJson.jsp?ip

 if(window.IPCallBack) {IPCallBack({"ip":"123.147.249.72","pro":"重庆市","proCode":"500000","city":"重庆市","cityCode":"500000","region":"渝北区","regionCode":"500112","addr":"重庆市渝北区 铁通","regionNames":"","err":""});}

 b.其他的API

太平洋网络IP地址查询Web接口 (pconline.com.cn)http://whois.pconline.com.cn/
whois.pconline.com.cn/ipJson.jsp?ip&level=3https://whois.pconline.com.cn/ipJson.jsp?ip&level=3

加上level=3后，获得的addr为重庆市渝北区，得不到铁通（level=3返回省市区）

if(window.IPCallBack) {IPCallBack({"ip":"123.147.249.72","pro":"重庆市","proCode":"500000","city":"重庆市","cityCode":"500000","region":"渝北区","regionCode":"500112","addr":"重庆市渝北区","regionNames":"","err":""});} 

c.JSON格式校验

I.不加level的返回值拿去校验

可以发现不是JSON格式

II.指定JSON格式获得值拿去校验

whois.pconline.com.cn/ipJson.jsp?ip&json=truehttps://whois.pconline.com.cn/ipJson.jsp?ip&json=true

{"ip":"123.147.249.72","pro":"重庆市","proCode":"500000","city":"重庆市","cityCode":"500000","region":"渝北区","regionCode":"500112","addr":"重庆市渝北区 铁通","regionNames":"","err":""}

 

d.天气类API 

 I.心知天气API（需要密钥和城市拼音）

开发文档：

天气实况 | 心知天气文档 (seniverse.com)

请求示例：当天实时天气

 II.中华万年历（只需要城市，不需要密钥）

已经失效......

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 （2）设计UI界面

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（3） 编写代码

a.IP地址请求

I.网络请求回应管理类

QNetworkRequest,QNetworkReply,QNetworkManager

II.文本编码类

QTextCodeC

    QNetworkReply *reply = (QNetworkReply *)sender();//可能会有多个函数连接到NetworkReply的信号finished上QTextCodec *codec = QTextCodec::codecForName("gbk");QString data=codec->toUnicode(reply->readAll());qDebug("%s",data.toStdString().data());

 有可能多个Object的signal会连接到同一个signal(例如多个Button可能会connect到一个slot函数onClick()),因此这是就需要判断到底是哪个Object emit了这个signal，根据sender的不同来进行不同的处理

 b.天气数据请求

I.心知天气访问当天实时天气示例

开发文档

天气实况 | 心知天气文档 (seniverse.com)

由于上面介绍的中华万年历已经失效，所以只能使用其他的API，这里我们使用心知天气的API

#include "widget.h"
#include "ui_widget.h"
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QDebug>
#include <QTextCodec>
Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);networkrmanager=new QNetworkAccessManager(this);// QNetworkRequest networkrequest;// networkrequest.setUrl(QUrl("https://whois.pconline.com.cn/ipJson.jsp?ip&json=true"));// QNetworkReply *networkreply=networkrmanager->get(networkrequest);// connect(networkreply,SIGNAL(finished()),this,SLOT(NetworkReplyFinished_Slot()));QNetworkRequest networkrequest;networkrequest.setUrl(QUrl("https://api.seniverse.com/v3/weather/now.json?key=自己的密钥&location=chongqing&language=en&unit=c"));QNetworkReply *weatherreply=networkrmanager->get(networkrequest);connect(weatherreply,SIGNAL(finished()),this,SLOT(WeatherReplyFinished_Slot()));
}Widget::~Widget()
{delete ui;
}
/*
//ip地址网络请求回应完成
void Widget::NetworkReplyFinished_Slot()
{QNetworkReply *reply = (QNetworkReply *)sender();   //可能会有多个函数连接到NetworkReply的信号finished上QTextCodec *codec = QTextCodec::codecForName("gbk"); //编码为gbkQString data=codec->toUnicode(reply->readAll());qDebug("%s",data.toStdString().data());reply->deleteLater();              //删除避免内存泄露int city_start = data.indexOf("city")+7;int city_end=data.indexOf("cityCode")-3;QString city_name=data.mid(city_start,city_end-city_start);qDebug()<<city_name;ui->location_txt->setText(city_name);//请求天气数据QNetworkRequest networkrequest;networkrequest.setUrl(QUrl("https://api.seniverse.com/v3/weather/now.json?key=SFeVqqT5EMlRWi6D0&location=chongqing&language=en&unit=c"));QNetworkReply *weatherreply=networkrmanager->get(networkrequest);connect(weatherreply,SIGNAL(finished()),this,SLOT(WeatherReplyFinished_Slot()));
}
*/
//获取天气
void Widget::WeatherReplyFinished_Slot()
{qDebug("hh");QNetworkReply *reply = (QNetworkReply *)sender();   //可能会有多个函数连接到NetworkReply的信号finished上QTextCodec *codec = QTextCodec::codecForName("gbk"); //编码为gbkQString data=codec->toUnicode(reply->readAll());qDebug("%s",data.toStdString().data());reply->deleteLater();              //删除避免内存泄露//查找城市int city_start = data.indexOf("name")+7;int city_end=data.indexOf("country")-3;QString city=data.mid(city_start,city_end-city_start);qDebug()<<city;ui->location_txt->setText(city);//查找天气int weather_start = data.indexOf("text")+7;int weather_end=data.indexOf("code")-3;QString weather=data.mid(weather_start,weather_end-weather_start);qDebug()<<weather;ui->weather_txt2->setText(weather);//查找温度int temperature_start = data.indexOf("temperature")+14;int temperature_end=data.indexOf("last_update")-4;QString temperature=data.mid(temperature_start,temperature_end-temperature_start);qDebug()<<temperature;ui->now_temperature_txt->setText(temperature);
}

 在代码中我们获得了三个信息，第一个是城市，第二个是天气，第三个是温度

{"results": [{"location": {"id": "***********","name": "Chongqing","country": "CN","path": "Chongqing,Chongqing,China","timezone": "Asia/Shanghai","timezone_offset": "+08:00"},"now": {"text": "Cloudy","code": "4","temperature": "27"},"last_update": "2024-04-01T16:07:48+08:00"}]
}

 运行效果：

II.心知天气连续几天天气获取示例

从昨天开始获取一直到未来三天

https://api.seniverse.com/v3/weather/daily.json?key=密钥&location=chongqing&language=zh-Hans&unit=c&start=-1&days=5

由于我们是免费用户，所以不能查询到昨日的天气信息。

c.关于解决编码问题-简体中文

上面第一次做出的界面为英文，我们获取的语言也是英文，我们后面把language改为zh-Hans（中文简体）更适合国人。修改编码为utf-8

d.使用心知天气连续访问几天天气的方式获取数据

从今天开始的五天（免费用户受限3天）

https://api.seniverse.com/v3/weather/daily.json?key=自己的密钥&location=chongqing&language=zh-Hans&unit=c&start=0&days=5

{"results": [{"location": {"id": "*********","name": "重庆","country": "CN","path": "重庆,重庆,中国","timezone": "Asia/Shanghai","timezone_offset": "+08:00"},"daily": [{"date": "2024-04-02","text_day": "多云","code_day": "4","text_night": "小雨","code_night": "13","high": "28","low": "19","rainfall": "0.69","precip": "0.36","wind_direction": "西北","wind_direction_degree": "315","wind_speed": "8.4","wind_scale": "2","humidity": "91"}, {"date": "2024-04-03","text_day": "小雨","code_day": "13","text_night": "中雨","code_night": "14","high": "27","low": "18","rainfall": "31.53","precip": "0.99","wind_direction": "西北","wind_direction_degree": "315","wind_speed": "8.4","wind_scale": "2","humidity": "87"}, {"date": "2024-04-04","text_day": "小雨","code_day": "13","text_night": "中雨","code_night": "14","high": "21","low": "17","rainfall": "8.35","precip": "0.79","wind_direction": "西","wind_direction_degree": "270","wind_speed": "3.0","wind_scale": "1","humidity": "91"}],"last_update": "2024-04-02T08:00:00+08:00"}]
}

（4）JSON格式解析

a.JSON格式

可以看到上面获得几天天气的API会返回一大串JSON格式数据，用我们上述的办法一个一个找非常麻烦，这个时候我们可以使用QT中的JSON类来解析。

#include <QJsonObject>
#include <QJsonParseError>
#include <QJsonDocument>

b.解析参考

Qt 常用JSON解析示例 - fengMisaka - 博客园 (cnblogs.com)https://www.cnblogs.com/linuxAndMcu/p/13040194.html

c.编写解析代码

    QJsonParseError jsonparseerror;QJsonDocument jsondocument;QJsonObject jsonobject;jsondocument = QJsonDocument::fromJson(data.toUtf8().data(),&jsonparseerror);if((jsonparseerror.error==QJsonParseError::NoError)&&(jsondocument.isEmpty()==false))  //判断是否解析成功{qDebug("成功");if(jsondocument.isObject()){jsonobject=jsondocument.object();QJsonValue resultsvalue=jsonobject.value("results");  //results是一个对象，得到它的值QJsonObject resultobject=resultsvalue.toArray().at(0).toObject();   //将results数组里面的第一个元素作为对象//解析last_updateQString last_update=resultobject.value("last_update").toString();qDebug()<<last_update;//解析地址QJsonObject locationobject=resultobject.value("location").toObject();  //将location作为对象QString location=locationobject.value("name").toString(); //将location对象里面的name的值取出来（转换为string）ui->location_txt->setText(location);  //设置地址qDebug()<<location;  //打印location//解析日期以及天气QJsonValue dailyvalue=resultobject.value("daily");QJsonArray dailyarray=dailyvalue.toArray();//qDebug()<<dailyarray.size();   //打印数组的个数QString weather[3];      //天气QString date[3];         //日期QString high_temprature[3];  //最高温QString low_temprature[3];   //最低温QString humidity[3];        //湿度for(int i=0;i<dailyarray.size();i++){QJsonObject jsob=dailyarray.at(i).toObject();   //数组转换为JSON对象weather[i]=jsob.value("text_day").toString();   //获取天气date[i]=jsob.value("date").toString();          //获取日期high_temprature[i]=jsob.value("high").toString(); //获取最高温low_temprature[i]=jsob.value("low").toString();  //获取最低温humidity[i]=jsob.value("humidity").toString();   //获取湿度qDebug()<<weather[i];}

 （5）QT解析JSON数据的方法

a.体系结构

[]代表的是数组，{}代表的是对象，从最外层开始一层一层往里面剥开，最外层始终是一个"{}"。最重要的就是分清对象和数组。有"[]"数组则使用QJsonArray将其转换为QJson数组，当没有"[]"即数组时最简单。我们主要操控Object。

b.把整个JSON文本转换用的是QJsonDocument。

需要注意检验文本是否是正确的QJson格式，这里推荐先使用网上的在线工具，比如Be Json

在线JSON校验格式化工具（Be JSON）https://www.bejson.com/

c.综合详解

以上面的心知天气返回的JSON为例：

I.先用QJsonDocument转换的文本转换给一个QJsonObject

    QJsonParseError jsonparseerror;QJsonDocument jsondocument;QJsonObject jsonobject;jsondocument = QJsonDocument::fromJson(data.toUtf8().data(),&jsonparseerror);if((jsonparseerror.error==QJsonParseError::NoError)&&(jsondocument.isEmpty()==false))  //判断是否解析成功{qDebug("成功");if(jsondocument.isObject()){jsonobject=jsondocument.object();

II.用QJsonObject.value提取results将其转换为QJsonObject

QJsonValue resultsvalue=jsonobject.value("results");  //results是一个对象，得到它的值

III.此时紧接着就是一个"["说明这是一个数组，然后由"{"囊括一直到last_update后面才有一个"}"结束囊括紧跟的就是"]"，说明这个results数组只有一个元素。

IIII.将results转换为QJsonArray数组并且取下标为0的值转换为QJsonObject（因为数组下标从0开始，并且只有一个元素）

QJsonObject resultobject=resultsvalue.toArray().at(0).toObject();

IIIII.此时results下标为0的对象(resultobject)中有三个元素"location"、"daily"、"last_update"，因为location以及daily内部都有很多内容，所以我们先提取最简单的"last_update"

IIIIII.此时可直接用resultobject.value("last_update")提取last_update的值。

QString last_update=resultobject.value("last_update").toString();
qDebug()<<last_update;

IIIIIII.再看location，用resultobject.value("location").toObject转换为QJsonObject(locationobject)，再将用location.value("").tostring将想要的值提出来。

QJsonObject locationobject=resultobject.value("location").toObject();  //将location作为对象
QString location=locationobject.value("name").toString(); //将location对象里面的name的值取出来（转换为string）
qDebug()<<location;  //打印location

IIIIIIII.再看daily，[]，说明是数组，但是它有三个元素"{},{},{}"，遇到数组将其转换为QJsonArray

QJsonArray dailyarray=resultobject.value("daily").toArray();

 再将Array的下标值转换为对象，再获取数据

        for(int i=0;i<dailyarray.size();i++){QJsonObject jsob=dailyarray.at(i).toObject();   //数组转换为JSON对象weather[i]=jsob.value("text_day").toString();   //获取天气date[i]=jsob.value("date").toString();          //获取日期high_temprature[i]=jsob.value("high").toString(); //获取最高温low_temprature[i]=jsob.value("low").toString();  //获取最低温humidity[i]=jsob.value("humidity").toString();   //获取湿度qDebug()<<weather[i];}

至此获取所有数据完毕。 

（6）UI界面数据加载以及天气图标切换

  //设置界面数据ui->humidity1->setText(humidity[0]);ui->humidity2->setText(humidity[1]);ui->humidity3->setText(humidity[2]);ui->today->setText(date[0]);ui->tomorrow->setText(date[1]);ui->dayaftertomorrow->setText(date[2]);ui->weather_txt1->setText(weather[0]);ui->weather_txt2->setText(weather[1]);ui->weather_txt3->setText(weather[2]);ui->temprature_txt1->setText(low_temprature[0]+'/'+high_temprature[0]);ui->temprature_txt2->setText(low_temprature[1]+'/'+high_temprature[1]);ui->temprature_txt3->setText(low_temprature[2]+'/'+high_temprature[2]);//更改图标if(weather[0]=="多云"){QString pic(":/pic/pic/multicloud.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="小雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="大雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="阴"){QString pic(":/pic/pic/cloudy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="晴"){QString pic(":/pic/pic/sunny.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}
//if(weather[1]=="多云"){QString pic(":/pic/pic/multicloud.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="小雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="大雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="阴"){QString pic(":/pic/pic/cloudy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="晴"){QString pic(":/pic/pic/sunny.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}
//if(weather[2]=="多云"){QString pic(":/pic/pic/multicloud.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="小雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="大雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="阴"){QString pic(":/pic/pic/cloudy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="晴"){QString pic(":/pic/pic/sunny.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}

 （7）实时刷新数据（使用一个定时器来定时获取数据）

//定时器溢出事件
void Widget::timeout_slot()
{counter++;//10秒更新一次时间信息if((counter%2==0)&&(counter!=60)){QNetworkRequest networkrequest;networkrequest.setUrl(QUrl("https://quan.suning.com/getSysTime.do"));QNetworkReply *timereply=networkrmanager->get(networkrequest);connect(timereply,SIGNAL(finished()),this,SLOT(TimeReplyFinished_Slot()));}//5分钟获取一次天气数据else if(counter==60){counter=0;QNetworkRequest networkrequest;networkrequest.setUrl(QUrl("https://api.seniverse.com/v3/weather/daily.json?key=用户密钥&location=chongqing&language=zh-Hans&unit=c&start=0&days=5"));QNetworkReply *weatherreply=networkrmanager->get(networkrequest);connect(weatherreply,SIGNAL(finished()),this,SLOT(WeatherReplyFinished_Slot()));}
}

（8）最终运行效果（UI有修改）

4.代码

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QDebug>
#include <QTextCodec>
#include <QJsonObject>
#include <QJsonParseError>
#include <QJsonDocument>
#include <QStringLiteral>
#include <QJsonArray>
#include <QPixmap>
#include <QTimer>Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);networkrmanager=new QNetworkAccessManager(this);QNetworkRequest networkrequest;//当日的天气// networkrequest.setUrl(QUrl("https://api.seniverse.com/v3/weather/now.json?key=用户密钥&location=chongqing&language=zh-Hans&unit=c"));//连续几日的天气networkrequest.setUrl(QUrl("https://api.seniverse.com/v3/weather/daily.json?key=用户密钥&location=chongqing&language=zh-Hans&unit=c&start=0&days=5"));QNetworkReply *weatherreply=networkrmanager->get(networkrequest);connect(weatherreply,SIGNAL(finished()),this,SLOT(WeatherReplyFinished_Slot()));timer_5s.start(5000);connect(&timer_5s,SIGNAL(timeout()),this,SLOT(timeout_slot()));}Widget::~Widget()
{delete ui;
}//获取天气
void Widget::WeatherReplyFinished_Slot()
{QNetworkReply *reply = (QNetworkReply *)sender();   //可能会有多个函数连接到NetworkReply的信号finished上QTextCodec *codec = QTextCodec::codecForName("utf-8"); //编码为gbkQString data=codec->toUnicode(reply->readAll());qDebug("%s",data.toStdString().data());reply->deleteLater();              //删除避免内存泄露//    //查找城市//    int city_start = data.indexOf("name")+7;//    int city_end=data.indexOf("country")-3;//    QString city=data.mid(city_start,city_end-city_start);// //   qDebug()<<city;//    ui->location_txt->setText(city);//    //查找天气//    int weather_start = data.indexOf("text")+7;//    int weather_end=data.indexOf("code")-3;//    QString weather=data.mid(weather_start,weather_end-weather_start);// //   qDebug()<<weather;//    ui->weather_txt1->setText(weather);//    //查找温度//    int temperature_start = data.indexOf("temperature")+14;//    int temperature_end=data.indexOf("last_update")-4;//    QString temperature=data.mid(temperature_start,temperature_end-temperature_start);// //   qDebug()<<temperature;//    ui->now_temperature_txt->setText(temperature);QJsonParseError jsonparseerror;QJsonDocument jsondocument;QJsonObject jsonobject;jsondocument = QJsonDocument::fromJson(data.toUtf8().data(),&jsonparseerror);if((jsonparseerror.error==QJsonParseError::NoError)&&(jsondocument.isEmpty()==false))  //判断是否解析成功{qDebug("成功");if(jsondocument.isObject()){jsonobject=jsondocument.object();QJsonValue resultsvalue=jsonobject.value("results");  //results是一个对象，得到它的值QJsonObject resultobject=resultsvalue.toArray().at(0).toObject();   //将results数组里面的第一个元素作为对象//解析last_updateQString last_update=resultobject.value("last_update").toString();qDebug()<<last_update;//解析地址QJsonObject locationobject=resultobject.value("location").toObject();  //将location作为对象QString location=locationobject.value("name").toString(); //将location对象里面的name的值取出来（转换为string）ui->location_txt->setText(location);  //设置地址qDebug()<<location;  //打印location//解析日期以及天气QJsonArray dailyarray=resultobject.value("daily").toArray();//qDebug()<<dailyarray.size();   //打印数组的个数QString weather[3];      //天气QString date[3];         //日期QString high_temprature[3];  //最高温QString low_temprature[3];   //最低温QString humidity[3];        //湿度for(int i=0;i<dailyarray.size();i++){QJsonObject jsob=dailyarray.at(i).toObject();   //数组转换为JSON对象weather[i]=jsob.value("text_day").toString();   //获取天气date[i]=jsob.value("date").toString();          //获取日期high_temprature[i]=jsob.value("high").toString(); //获取最高温low_temprature[i]=jsob.value("low").toString();  //获取最低温humidity[i]=jsob.value("humidity").toString();   //获取湿度qDebug()<<weather[i];}//设置界面数据ui->humidity1->setText(humidity[0]);ui->humidity2->setText(humidity[1]);ui->humidity3->setText(humidity[2]);ui->today->setText(date[0]);ui->tomorrow->setText(date[1]);ui->dayaftertomorrow->setText(date[2]);ui->weather_txt1->setText(weather[0]);ui->weather_txt2->setText(weather[1]);ui->weather_txt3->setText(weather[2]);ui->temprature_txt1->setText(low_temprature[0]+'/'+high_temprature[0]);ui->temprature_txt2->setText(low_temprature[1]+'/'+high_temprature[1]);ui->temprature_txt3->setText(low_temprature[2]+'/'+high_temprature[2]);//更改图标if(weather[0]=="多云"){QString pic(":/pic/pic/multicloud.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="小雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="大雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="阴"){QString pic(":/pic/pic/cloudy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}else if(weather[0]=="晴"){QString pic(":/pic/pic/sunny.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img1->height(),ui->weather_img1->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img1->setPixmap(pixmap);}
//if(weather[1]=="多云"){QString pic(":/pic/pic/multicloud.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="小雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="大雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="阴"){QString pic(":/pic/pic/cloudy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}else if(weather[1]=="晴"){QString pic(":/pic/pic/sunny.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img2->height(),ui->weather_img2->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img2->setPixmap(pixmap);}
//if(weather[2]=="多云"){QString pic(":/pic/pic/multicloud.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="小雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="大雨"){QString pic(":/pic/pic/rainy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="阴"){QString pic(":/pic/pic/cloudy.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}else if(weather[2]=="晴"){QString pic(":/pic/pic/sunny.png");QPixmap pixmap(pic);pixmap=pixmap.scaled(ui->weather_img3->height(),ui->weather_img3->width(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation);ui->weather_img3->setPixmap(pixmap);}//时间请求QNetworkRequest networkrequest;networkrequest.setUrl(QUrl("https://quan.suning.com/getSysTime.do"));QNetworkReply *timereply=networkrmanager->get(networkrequest);connect(timereply,SIGNAL(finished()),this,SLOT(TimeReplyFinished_Slot()));}}
}//时间请求相应
void Widget::TimeReplyFinished_Slot()
{QNetworkReply *reply = (QNetworkReply *)sender();   //可能会有多个函数连接到NetworkReply的信号finished上QTextCodec *codec = QTextCodec::codecForName("utf-8"); //编码为gbkQString data=codec->toUnicode(reply->readAll());qDebug("%s",data.toStdString().data());reply->deleteLater();              //删除避免内存泄露int Date_start;int Date_end;int hour_start;int hour_end;int min_start;int min_end;int sec_start;int sec_end;Date_start=data.indexOf("sysTime2")+11;Date_end=data.indexOf("sysTime1")-12;QString Date=data.mid(Date_start,Date_end-Date_start);//qDebug()<<Date;hour_start=data.indexOf("sysTime2")+22;hour_end=data.indexOf("sysTime1")-9;QString hour=data.mid(hour_start,hour_end-hour_start);//qDebug()<<hour;min_start=data.indexOf("sysTime2")+25;min_end=data.indexOf("sysTime1")-6;QString min=data.mid(min_start,min_end-min_start);//qDebug()<<min;sec_start=data.indexOf("sysTime2")+28;sec_end=data.indexOf("sysTime1")-3;QString sec=data.mid(sec_start,sec_end-sec_start);//qDebug()<<sec;ui->Date_txt->setText(Date);ui->time_hour->display(hour);ui->time_min->display(min);ui->time_sec->display(sec);
}//定时器溢出事件
void Widget::timeout_slot()
{counter++;//10秒更新一次时间信息if((counter%2==0)&&(counter!=60)){QNetworkRequest networkrequest;networkrequest.setUrl(QUrl("https://quan.suning.com/getSysTime.do"));QNetworkReply *timereply=networkrmanager->get(networkrequest);connect(timereply,SIGNAL(finished()),this,SLOT(TimeReplyFinished_Slot()));}//5分钟获取一次天气数据else if(counter==60){counter=0;QNetworkRequest networkrequest;networkrequest.setUrl(QUrl("https://api.seniverse.com/v3/weather/daily.json?key=用户密钥&location=chongqing&language=zh-Hans&unit=c&start=0&days=5"));QNetworkReply *weatherreply=networkrmanager->get(networkrequest);connect(weatherreply,SIGNAL(finished()),this,SLOT(WeatherReplyFinished_Slot()));}
}

widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QNetworkAccessManager>
#include <QTimer>
QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();QNetworkAccessManager *networkrmanager;QTimer timer_5s;int counter=0;
private:Ui::Widget *ui;public slots:void WeatherReplyFinished_Slot();void timeout_slot();void TimeReplyFinished_Slot();
};
#endif // WIDGET_H