基于Qt获取天气信息

最新推荐文章于 2025-02-08 20:16:53 发布

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最新推荐文章于 2025-02-08 20:16:53 发布

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文章标签： qt5 c++

本文链接：https://blog.youkuaiyun.com/yanw1234/article/details/119546097

版权

本文介绍了一位学生在毕业设计中使用Qt框架开发的一款天气应用。通过向指定URL发送请求获取JSON天气数据，解析数据并更新UI，展示包括日期、天气状况、温度、风向等信息。应用支持切换不同城市，且能定时更新显示当前时间。代码中包含了关键的网络请求、JSON解析和UI更新操作。

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一. 最近在准备毕业设计的材料，先在设计上扩展一些小功能，天气这方式必然是一个很好的选择，跟自己的专业相关，合情合理，废话不多说上代码：
第一步:
对界面的设计很重要：
在这里插入图片描述
在设计方面我就这水平，哈哈，没有设计的细胞。
第二步不嘚直接上代码:

//在.pro上一定添加：
QT       += core gui network//为什么要添加，我相信大家都知道

widget.h头文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QString>
#include <QLabel>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QJsonObject>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonValue>
#include <QJsonParseError>
#include <QTime>
#include <QTimer>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);


    ~Widget();

private slots:
    void on_comboBox_activated(const QString &arg1);//combox点击事件
    void doProcessfinished(QNetworkReply*);//Http获取数据
    void doPressTimeout();
    //文本控件的初始化

private:
    Ui::Widget *ui;

    void Init();
    void req_Init();
    void set_TypePic(QString type,int i);//对应天气图标
    void set_BlackDraw(QString type);
    QLabel *week[5];//星期
    QLabel *wind[5];//风向
    QLabel *api[5];//七气体
    QLabel *wendu[5];//温度
    QLabel *wea[5];//天气实况
    QLabel *date[5];//日期
    QLabel *pic[5];//天气对应图片
    QTimer *time;
    QNetworkAccessManager *manager;
    QNetworkRequest request;
    QString str;

};

#endif // WIDGET_H

**关键代码部分在这里：
widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QString>
#include <QDateTime>
#include <QByteArray>
#include <QDebug>
#include "QImage"
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{

    ui->setupUi(this);
    Init();

    this->setFixedSize(this->width(),this->height());//固定窗口大小
}

Widget::~Widget()
{
    delete ui;
}
void Widget::Init()
{
    //获取COMbox中选择的值
    QString addr = ui->comboBox->currentText();
    //将值赋值给addr的文本
    ui->addr->setText(addr);

    //星期
    week[0] = ui->week1; week[1] = ui->week2;
    week[2] = ui->week3; week[3] = ui->week4; week[4] = ui->week5;

    //天气
    wea[0] = ui->wea1;wea[1] = ui->wea2;
    wea[2] = ui->wea3;wea[3] = ui->wea4;wea[4] = ui->wea5;
    //温度的存储
    wendu[0] = ui->wendu1; wendu[1] = ui->wendu2;
    wendu[2] = ui->wendu3; wendu[3] = ui->wendu4;wendu[4] = ui->wendu5;
    //
    api[0] = ui->api1;api[1] = ui->api2;
    api[2] = ui->api3;api[3] = ui->api4;api[4] = ui->api5;
    //风向
    wind[0] = ui->wind1;wind[1] = ui->wind2;
    wind[2] = ui->wind3;wind[3] = ui->wind4;wind[4] = ui->wind5;
    //日期
    date[1] = ui->date1;date[2] = ui->date2;
    date[3] = ui->date3;date[4] = ui->date4;
    //图片
    pic[0] = ui->pic1;pic[1] = ui->pic2;
    pic[2] = ui->pic3;pic[3] = ui->pic4;pic[4] = ui->pic5;
    req_Init();
    time = new QTimer();
    time->start(1000);
    connect(time,SIGNAL(timeout()),this,SLOT(doPressTimeout()));

}
void Widget::req_Init()
{
    str = "http://wthrcdn.etouch.cn/weather_mini?city=厦门";
    QUrl url(str);
    manager = new QNetworkAccessManager(this);
    request.setUrl(url);
    manager->get(request);
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(doProcessfinished(QNetworkReply*)));
}
void Widget::doProcessfinished(QNetworkReply *reply)
{
    QByteArray arry =  reply->readAll();
    //qDebug()<<arry;
    QJsonDocument doc = QJsonDocument::fromJson(arry);
    if(!doc.isNull())
    {
        QJsonObject obj =  doc.object();//将获取的数据转换为Json格式
        if(obj.contains("data"))//判断是否有包含“data”的对象
        {
            QJsonValue val = obj.value("data");//获取“data”对象的
            if(val.isObject())
            {

                QJsonObject jsonDate = val.toObject();
                QString wendu_avg = jsonDate.value("wendu").toString();
                ui->label_2->setText(wendu_avg);
                QJsonValue fore = jsonDate.value("forecast");
                if(fore.isArray())
                {
                    QJsonArray Jsonarry = fore.toArray();
                    for(int i = 0;i<5;i++)
                    {
                        QJsonObject weaobj = Jsonarry.at(i).toObject();//遍历获取
                        QString high = weaobj.value("high").toString().mid(3);//最高温度
                        QString low = weaobj.value("low").toString().mid(3,2);//最低温度
                        QString sWeek = weaobj.value("date").toString().mid(2);//获取星期
                        QString sDate = weaobj.value("date").toString().mid(0,2);//日期
                        QString sWind = weaobj.value("fengxiang").toString();//风向
                        QString sfengli = weaobj.value("fengli").toString().mid(8,9);
                        QString sWind_Fingli = sWind+sfengli;
                        QString type = weaobj.value("type").toString();//获取天气实况
                        if(i == 0){
                            ui->label_4->setText(type+"(实时)");
                            set_BlackDraw(type);
                        }
                        if(sDate.toInt()>=10)//当日期大于等于10时
                        {
                            sDate = weaobj.value("date").toString().mid(0,3);//日期
                            sWeek = weaobj.value("date").toString().mid(3);//获取星期
                        }
                        if(i>0){date[i]->setText(sDate);}
                        QString wendu_fan = low+"~"+high;
                        wendu[i]->setText(wendu_fan);//获取温度的范围
                        week[i]->setText(sWeek);
                        wind[i]->setText(sWind_Fingli);
                        wea[i]->setText(type);
                        set_TypePic(type,i);
                    }
                }
            }
        }

    }
}
void Widget::set_TypePic(QString type,int i)
{
    QString Path;
    if(type =="小雨"){Path = ":/res/小雨.png";}
    if(type =="大雨"||type == "暴雨"){Path = ":/res/大雨.png";}
    if(type == "晴"){Path = ":/res/晴.png";}
    if(type == "多云"){Path = ":/res/多云.png";}
    if(type == "晴转多云"){Path = ":/res/晴转多云.png";}
    if(type == "阵雨"|| type == "雷阵雨"){Path = ":/res/阵雨.png";}
    if(type == "阴"){Path = ":/res/阴天.png";}
    if(type == "中雨"){Path = ":/res/中雨.png";}
    pic[i]->setPixmap(QPixmap(Path));

}
void Widget::set_BlackDraw(QString type)
{

    QString Path;
    if(type == "大雨" || type == "中雨" ){Path = ":res/big_rain.webp";}
    else if(type=="暴雨" ){Path = ":res/rain.webp";}
    else if(type == "小雨"){Path = ":res/small_rain.jpg";}
    else if(type == "阴"){Path = ":res/yin.jpg";}
    else if(type == "多云"){Path = ":res/wallpaper2.jpg";}
    else if(type == "晴")  {Path = ":res/sun.jpg";}
    else if(type == "雷阵雨" || type == "阵雨")  {Path = ":res/light_rain1.jpg";}

    //设置背景图片
    this->setAutoFillBackground(true); // 这句要加上, 否则可能显示不出背景图.
    QPalette palette = this->palette();
    palette.setBrush(QPalette::Window,
    QBrush(QPixmap(Path).scaled(// 缩放背景图.
    this->size(),
    Qt::IgnoreAspectRatio,
    Qt::SmoothTransformation)));// 使用平滑的缩放方式
    this->setPalette(palette);// 给widget加上背景图
}
void Widget::on_comboBox_activated(const QString &arg1)
{
    //获取COMbox中选择的值
    QString addr = ui->comboBox->currentText();
    ui->addr->setText(addr);
    //将值赋值给addr的文本
    if(addr == "莆田"){str = "http://wthrcdn.etouch.cn/weather_mini?city=莆田";}
    if(addr == "厦门"){str = "http://wthrcdn.etouch.cn/weather_mini?city=厦门";}
    if(addr == "福州"){str = "http://wthrcdn.etouch.cn/weather_mini?city=福州";}
    if(addr == "杭州"){str = "http://wthrcdn.etouch.cn/weather_mini?city=杭州";}
    if(addr == "上海"){str = "http://wthrcdn.etouch.cn/weather_mini?city=上海";}
    if(addr == "南京"){str = "http://wthrcdn.etouch.cn/weather_mini?city=南京";}
    if(addr == "海口"){str = "http://wthrcdn.etouch.cn/weather_mini?city=海口";}
    if(addr == "宁德"){str = "http://wthrcdn.etouch.cn/weather_mini?city=宁德";}
    if(addr == "南平"){str = "http://wthrcdn.etouch.cn/weather_mini?city=南平";}
    if(addr == "泉州"){str = "http://wthrcdn.etouch.cn/weather_mini?city=泉州";}
    if(addr == "三明"){str = "http://wthrcdn.etouch.cn/weather_mini?city=三明";}
    if(addr == "龙岩"){str = "http://wthrcdn.etouch.cn/weather_mini?city=龙岩";}
    if(addr == "漳州"){str = "http://wthrcdn.etouch.cn/weather_mini?city=漳州";}
    if(addr == "北京"){str = "http://wthrcdn.etouch.cn/weather_mini?city=北京";}
    if(addr == "深圳"){str = "http://wthrcdn.etouch.cn/weather_mini?city=深圳";}
    if(addr == "乌鲁木齐"){str = "http://wthrcdn.etouch.cn/weather_mini?city=乌鲁木齐";}
    if(addr == "郑州"){str = "http://wthrcdn.etouch.cn/weather_mini?city=郑州";}
    QUrl url(str);
    manager = new QNetworkAccessManager(this);
    request.setUrl(url);
    manager->get(request);
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(doProcessfinished(QNetworkReply*)));

}
void Widget::doPressTimeout()//时间触发事件
{
    //获取当前时间
    QDateTime DT = QDateTime::currentDateTime();
    ui->year->setText(DT.toString("yyyy-MM-dd"));
    ui->time->setText(DT.toString("hh:mm:ss"));
}

运行结果如图:
在这里插入图片描述

主要参考：https://blog.youkuaiyun.com/qq_42449351/article/details/100088010

注:如果需要源码可以留言！！！(若有不足之处多多指教)