Qt实现打开网页

Qt实现打开网页，新建一个mainwindow。在UI界面添加一个Text Browser。

首先在myHTTP.pro中添加QT   +=  network

在mainwindow.h中新建两个类，QNetworkReply和QNetworkAccessManager。

class QNetworkReply;

class QNetworkAccessManager;

private: QNetworkAccessManager *manager;

private slots:  replyFinished(QNetworkReply *);

再新建一个私有指针和一个槽，用来接收信号。做出相应的操作。

私有指针作为发送点，槽作为接受点。

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
class QNetworkReply;
class QNetworkAccessManager;

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QNetworkAccessManager *manager;
private slots:
    void replyFinished(QNetworkReply *);
};

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtNetwork/QtNetwork>
#include <QTextCodec>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    manager=new QNetworkAccessManager(this);
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,
            SLOT(replyFinished(QNetworkReply*)));
    manager->get(QNetworkRequest(QUrl("http://www.baidu.com")));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::replyFinished(QNetworkReply *reply)
{
    QTextCodec *codec=QTextCodec::codecForName("UTF-8");
    QString all=codec->toUnicode(reply->readAll());
    ui->textBrowser->setText(all);
    reply->deleteLater();
}

connect(sender,SIGNAL(signal),this,SLOT(slot));