使用Qt访问网站的基本例子

<QNetworkAccessManager>
<QNetworkReply>
<QNetworkRequest>

#include <QtNetwork>

QT += network

#include <QCoreApplication>
#include "TestNet.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    TestNet One;
    One.GetWeb();

    return a.exec();
}

//main.cpp

#include <QtNetwork>
#include <iostream>
#include <QFile>

class TestNet : public QObject
{
    Q_OBJECT
public:
    QNetworkAccessManager *m_manager = NULL;
    QNetworkRequest *m_request = NULL;

    //访问网站
    void GetWeb()
    {
        //建立新对象
        m_manager = new QNetworkAccessManager();
        m_request = new QNetworkRequest(QUrl("http://www.baidu.com/"));

        //连接槽
        QObject::connect(m_manager,&QNetworkAccessManager::finished,this,&TestNet::GetWebFinished);

        //发送Get请求
        m_manager->get(*m_request);
    }

    //访问后做的操作
    void GetWebFinished(QNetworkReply *reply)
    {
        //转换为utf-8编码，这样就可以显示中文了
        QTextCodec *codec = QTextCodec::codecForName("utf8");
        QString getData = codec->toUnicode(reply->readAll());

        //输出文件
        QFile out_file("One.html");
        out_file.open(QIODevice::Text | QIODevice::WriteOnly);

        out_file.write(getData.toUtf8());

        out_file.close();
    }

};

//TestNet.h