QT通过API获取天气信息

/*流程图

* 先是按钮点击->转到槽函数btn_1_clicked->槽函数里面连接网站信息通过connect->replyfinished(QNetworkReply *reply)

* 这个函数是读取返回的数据并储存->调用init(QString str)进行解析返回来的数据，并显示在布局好的lable上

*/

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent)

{

this->resize(800,600);

move(0,0);

QFont font("Times", 10, QFont::Bold);

btn_1 = new QPushButton("tianqi",this);

btn_1->setFixedSize(100,50);

//    lab1 =  new QLabel(this);

//    lab1->setFont(font);

//    lab1->setGeometry(0,300,800,300);

//    lab1->setStyleSheet("background-color: rgb(159, 255, 144);");

//    lab1->setWordWrap(true);

QLabel *lab_1 = new QLabel(this);

lab_1->setGeometry(50,0,700,50);

QDateTime data = QDateTime::currentDateTime();

lab_1->setFont(font);

lab_1->setText(data.toString("yyyy-MM-dd  hh:mm"));

lab_1->setAlignment(Qt::AlignCenter);//设置文字居中

connect(btn_1,SIGNAL(clicked(bool)),this,SLOT(btn_1_clicked()));

QLabel *lab = new QLabel(this);

lable.append(lab);

QFont fo("Times",15,QFont::Bold);

lab->setFont(fo);

lab->setGeometry(550,170,150,150);

lab->setWordWrap(true);

QLabel *lab_2 = new QLabel(this);

lable.append(lab_2);

QFont f("Times",30,QFont::Bold);

lab_2->setFont(f);

lab_2->setGeometry(150,150,300,100);

QLabel *lab_3 = new QLabel(this);

lable.append(lab_3);

QFont f1("Times",20,QFont::Bold);

lab_3->setFont(f1);

lab_3->setGeometry(150,250,55,50);

layout();

}

MainWindow::~MainWindow()

{

}

void MainWindow::btn_1_clicked()

{

manage = new QNetworkAccessManager(this);

QNetworkRequest network_request;

network_request.setUrl(QUrl("http://wthrcdn.etouch.cn/weather_mini?citykey=101020100"));

//    network_request.setHeader(QNetworkRequest::UserAgentHeader,QVariant::BitArray);

connect(manage,SIGNAL(finished(QNetworkReply *)),this,SLOT(replyfinished(QNetworkReply*)));

//    manage->get(QNetworkRequest(QUrl("http://int.dpool.sina.com.cn/iplookup/iplookup.php")));

//    manage->get(QNetworkRequest(QUrl("http://int.dpool.sina.com.cn/iplookup/iplookup.php")));

manage->get(network_request);

//    manage->get(QNetworkRequest(QUrl("http://pv.sohu.com/cityjson?ie=utf-8")));

}

void MainWindow::replyfinished(QNetworkReply *reply)

{

QVariant status_code = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);

if(reply->error() == QNetworkReply::NoError)

{

bytes = reply->readAll();

QString add(bytes);

qDebug()<<add;

all = add;

init(add);

//        lab1->setText(add);

}

reply->deleteLater();

}

/*返回的数据"{\"data\":

{\"yesterday\":

   {

\"date\":\"11日星期一\",

\"high\":\"高温 10℃\",

\"fx\":\"北风\",

\"low\":\"低温 5℃\",

\"fl\":\"<![CDATA[<3级]]>\",

\"type\":\"晴\"

},

\"city\":\"上海\",

\"aqi\":\"37\",

\"forecast\":

[{\"date\":\"12日星期二\",

            \"high\":\"高温 10℃\",

\"fengli\":\"<![CDATA[3-4级]]>\",

\"low\":\"低温 6℃\",

\"fengxiang\":\"东北风\",

\"type\":\"多云\"},

{\"date\":\"13日星期三\",

\"high\":\"高温 11℃\",

\"fengli\":\"<![CDATA[3-4级]]>\",

\"low\":\"低温 7℃\",

\"fengxiang\":\"东北风\",

\"type\":\"阴\"},

{\"date\":\"14日星期四\",

            \"high\":\"高温 10℃\",

\"fengli\":\"<![CDATA[3-4级]]>\",

\"low\":\"低温 8℃\",

\"fengxiang\":\"东北风\",

\"type\":\"阴\"},

{\"date\":\"15日星期五\",

\"high\":\"高温 12℃\",

\"fengli\":\"<![CDATA[<3级]]>\",

\"low\":\"低温 6℃\",

\"fengxiang\":\"东北风\",

\"type\":\"小雨\"},

{\"date\":\"16日星期六\",

\"high\":\"高温 9℃\",

\"fengli\":\"<![CDATA[3-4级]]>\",

\"low\":\"低温 3℃\",

\"fengxiang\":\"北风\",

\"type\":\"小雨\"}],

\"ganmao\":\"天气较凉，较易发生感冒，请适当增加衣服。体质较弱的朋友尤其应该注意防护。\",

\"wendu\":\"9\"

},

\"status\":1000,\"desc\":\"OK\"}"*/

void MainWindow::init(QString str)//读取json数据

{

QByteArray byte_array;

QJsonParseError json_error;

QJsonDocument document = QJsonDocument::fromJson(byte_array.append(str),&json_error);

if(json_error.error == QJsonParseError::NoError)

{

QJsonObject obj = document.object();

QJsonValue value  = obj.take("desc");//qjsonvalue生成json文档中对象的值的对象

if(value.toString() != "OK")

 {

//             QMessageBox::warning(this,QString::fromLocal8Bit("抱歉"),QString::fromLocal8Bit("暂无此城市信息"),QMessageBox::Ok,QMessageBox::Ok);

QMessageBox::warning(this,"抱歉","暂无此城市的天气情况",QMessageBox::Ok,QMessageBox::Ok);

return;

 }

QJsonValue da = obj.take("data");//获取data数据对象里面的值

data.ganmao = da.toObject().take("ganmao").toString();//da.toobject()表示的是data对象里面的对象，tostring再将它转换成string类型

data.wendu = da.toObject().take("wendu").toString();

data.city = da.toObject().take("city").toString();

qDebug()<<"1111111111111111111111"<<data.ganmao;

lable.at(0)->setText(data.ganmao);

//lable.at(1)->setText(QString::fromLocal8Bit("%1℃").arg(data.wendu));

//QString使用%1、%2~%99的参数范围显示或储存字符串

/*举个栗子

* QString i = "10";

* QString j = "25";

* Qstring filename = "test.cpp";

* QString string = QString("Processing file %1 of %2:%3")

*                                  .arg(i).arg(j).arg(filename);*/

lable.at(1)->setText(QString::fromLocal8Bit("%1℃").arg(data.wendu));

lable.at(2)->setText(QString::fromLocal8Bit("%1").arg(data.city));

QJsonValue da1 = da.toObject().take("forecast");

QJsonArray array = da1.toArray();

for(int i =0;i<5;i++)

{

QJsonValue value = array.at(i);

QJsonObject obj = value.toObject();

forecast[i].fengxiang = obj.take("fengxiang").toString();

forecast[i].date = obj.take("date").toString();

forecast[i].fengli = obj.take("fengli").toString();

forecast[i].high = obj.take("high").toString();

forecast[i].low = obj.take("low").toString();

forecast[i].type = obj.take("type").toString();

}

for(int i =0;i<5;i++)

{

//            forecast_date_list[i]->setText(QString::fromLocal8Bit("%1").arg(forecast[i].date));

datalable.at(i)->setText(QString::fromLocal8Bit("%1").arg(forecast[i].date));//贴日期的文本

templable.at(i)->setText(QString::fromLocal8Bit("%1-%2").arg(forecast[i].low.split(" ").at(1)).arg(forecast[i].high.split(" ").at(1)));//贴温度的文本

//            forecast_temp_list[i]->setText(QString::fromLocal8Bit("%1 - %2").arg(forecast[i].low.split(" ").at(1)).arg(forecast[i].high.split(" ").at(1)));

qDebug()<<datalable.at(i)->text();

typelable.at(i)->setPixmap(QPixmap(QString::fromLocal8Bit(":/pic/%1.png").arg(forecast[i].type)));//贴对应的天气图片

}

datalable.at(0)->setText(QString::fromLocal8Bit("   今天"));

}

}

void MainWindow::layout()//布局

{

QHBoxLayout *layout = new QHBoxLayout(this);

QHBoxLayout *layout1 = new QHBoxLayout(this);

QHBoxLayout *layout2 = new QHBoxLayout(this);

for(int i =0;i<5;i++)

{

    QLabel *lab = new QLabel(this);

lab->setFixedSize(50,50);

lab->setAlignment(Qt::AlignCenter);

lab->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);

templable.append(lab);

layout->addWidget(lab);

}

for(int i =0;i<5;i++)

{

    QLabel *lab = new QLabel(this);

lab->setFixedSize(60,50);

lab->setAlignment(Qt::AlignLeft);

lab->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);

datalable.append(lab);

layout1->addWidget(lab);

}

for(int i =0;i<5;i++)

{

    QLabel *lab = new QLabel(this);

lab->setFixedSize(60,50);

//lab->setAlignment(Qt::AlignLeft);

lab->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);

typelable.append(lab);

layout2->addWidget(lab);

}

QRect rect(0,550,800,50);

layout->setGeometry(rect);

QRect rect1(0,450,800,50);

layout1->setGeometry(rect1);

QRect rect2(0,500,800,50);

layout2->setGeometry(rect2);

//    setLayout(layout);

//    setLayout(layout1);

}

.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QPushButton>

#include <QtNetwork/QNetworkReply>

#include <QtNetwork/QNetworkAccessManager>

#include <QLabel>

#include <QTextCodec>

#include <QByteArray>

#include <QtNetwork/QNetworkRequest>

#include <QJsonParseError>

#include <QJsonDocument>

#include <QJsonObject>

#include <QJsonValue>

#include <QMessageBox>

#include <QHBoxLayout>

#include <QJsonArray>

struct DATA{

QString ganmao;

QString wendu;

QString city;

};

struct Forecast

{

QString date;

QString high;

QString fengli;

QString low;

QString fengxiang;

QString type;

};

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

~MainWindow();

public slots:

void btn_1_clicked();

void replyfinished(QNetworkReply *reply);

void init(QString str);

void layout();

private:

QPushButton *btn_1;

QLabel *lab1;

QString all;

DATA data;

Forecast forecast[5];

QByteArray bytes;

QNetworkAccessManager *manage;

QVector <QLabel *>lable;

QVector <QLabel *>templable;

QVector <QLabel *>datalable;

QVector <QLabel *>typelable;

};

#endif // MAINWINDOW_H