Qt网络编程——get请求

1. 程序

widge.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include<QtNetwork/QNetworkRequest>
#include<QtNetwork/QNetworkReply>
#include<QtNetwork/QNetworkAccessManager>namespace Ui {class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();void get();void getBack(QNetworkReply * reply);private:Ui::Widget *ui;QNetworkAccessManager * manager;};#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include<QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);manager = new QNetworkAccessManager(this);connect(manager,&QNetworkAccessManager::finished,this,&Widget::getBack);//通信完成后，自动执行getBackget();
}Widget::~Widget()
{delete ui;
}void Widget::get()
{QNetworkRequest request;request.setUrl(QUrl("https://api.66mz8.com/api/weather.php?location=北京"));manager->get(request); //发出get请求}void Widget::getBack(QNetworkReply * reply)
{qDebug()<<reply->readAll().data(); //输出响应内容，其中.data()表示转换为json格式
}

2. 注意

在此项目中，需要用到https协议来访问服务器，然而在调用服务器时却发现程序运行时，QT控制台报错如下：

qt.network.ssl: QSslSocket: cannot call unresolved function SSLv23_client_method
qt.network.ssl: QSslSocket: cannot call unresolved function SSL_CTX_new
qt.network.ssl: QSslSocket: cannot call unresolved function SSL_library_init
qt.network.ssl: QSslSocket: cannot call unresolved function ERR_get_error
qt.network.ssl: QSslSocket: cannot call unresolved function ERR_get_error

解决：
在Qt目录下Qt5.4.2\Tools\mingw491_32\opt\bin 找到libeay32.dll 和 ssleay32.dll两个库文件，将这两个库文件拷贝到程序生成目录下（即生成exe的同级目录），即可。

3. 运行结果

{"code": 200,"citynm": "北京","cityno": "beijing","data": [{"days": "2021-08-05","week": "星期四","temperature": "30℃\/23℃","weather": "雷阵雨转多云","weather_icon": "http:\/\/api.k780.com\/upload\/weather\/d\/4.gif","wind": "东南风"},{"days": "2021-08-06","week": "星期五","temperature": "32℃\/22℃","weather": "多云转晴","weather_icon": "http:\/\/api.k780.com\/upload\/weather\/d\/1.gif","wind": "东北风转西南风"},{"days": "2021-08-07","week": "星期六","temperature": "33℃\/23℃","weather": "晴","weather_icon": "http:\/\/api.k780.com\/upload\/weather\/d\/0.gif","wind": "南风转西南风"},{"days": "2021-08-08","week": "星期日","temperature": "32℃\/24℃","weather": "多云转晴","weather_icon": "http:\/\/api.k780.com\/upload\/weather\/d\/1.gif","wind": "南风转西南风"},{"days": "2021-08-09","week": "星期一","temperature": "32℃\/23℃","weather": "多云","weather_icon": "http:\/\/api.k780.com\/upload\/weather\/d\/1.gif","wind": "东风转西北风"},{"days": "2021-08-10","week": "星期二","temperature": "31℃\/23℃","weather": "阴转多云","weather_icon": "http:\/\/api.k780.com\/upload\/weather\/d\/2.gif","wind": "东风"},{"days": "2021-08-11","week": "星期三","temperature": "32℃\/23℃","weather": "晴转多云","weather_icon": "http:\/\/api.k780.com\/upload\/weather\/d\/0.gif","wind": "东南风转东北风"}]
}

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Qt网络编程——get请求

1. 程序

widge.h

widget.cpp

2. 注意

3. 运行结果

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