웹서버에 요청한 데이터를 수신하는 예제

요청 URL: http://www.google.com

응답: <HTML><HEAD><meta http-equiv=\”content-type\” content=\”text/html;charset=utf-8\”>\n<TITLE>302 Moved</TITLE></HEAD><BODY>\n<H1>302 Moved</H1>\nThe document has moved\n<A HREF=\”http://www.google.co.kr/?gfe_rd=cr&dcr=0&ei=kJAFWv-uOsOe9AWf_oCoBQ\”>here</A>.\r\n</BODY></HTML>\r\n

예제 코드

main.cpp

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

return a.exec();
}




mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QNetworkReply>

namespace Ui {
class MainWindow;
}

class QNetworkReply;
class QSslError;

class MainWindow : public QMainWindow
{
Q_OBJECT

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

void request();

private:
Ui::MainWindow *ui;
QNetworkReply *m_reply;
QNetworkAccessManager m_nam;

private slots:
void authenticationRequired(QNetworkReply*, QAuthenticator*);
void httpFinished();

#ifndef QT_NO_SSL
void sslErrors(QNetworkReply*,const QList<QSslError> &errors);
#endif
};

#endif // MAINWINDOW_H




mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
m_reply = 0;connect(&m_nam, SIGNAL(authenticationRequired(QNetworkReply*,QAuthenticator*)),
this, SLOT(authenticationRequired(QNetworkReply*,QAuthenticator*)));
#ifndef QT_NO_SSL
connect(&m_nam, SIGNAL(sslErrors(QNetworkReply*,QList<QSslError>)),
this, SLOT(sslErrors(QNetworkReply*,QList<QSslError>)));
#endifrequest();
}MainWindow::~MainWindow()
{
delete ui;
}void MainWindow::request()
{
QSslConfiguration config = QSslConfiguration::defaultConfiguration();
config.setProtocol(QSsl::TlsV1_2);const QUrl url = QUrl::fromUserInput("http://www.google.com");QNetworkRequest request(url);
m_reply = m_nam.get(request);connect(m_reply, SIGNAL(finished()), this, SLOT(httpFinished()));
}void MainWindow::authenticationRequired(QNetworkReply*, QAuthenticator *)
{
qDebug() << "MainWindow::authenticationRequired";
}void MainWindow::httpFinished()
{
m_reply = (QNetworkReply*)sender();
QString data = m_reply->readAll();qDebug() << "MainWindow::httpFinished"
<< " data:" << data;
}#ifndef QT_NO_SSL
void MainWindow::sslErrors(QNetworkReply *, const QList<QSslError> &errors)
{
QString errorString;
foreach (const QSslError &error, errors) {
if (!errorString.isEmpty())
errorString += '\n';
errorString += error.errorString();
}
qDebug() << "MainWindow::sslErrors"
<< "error:" << errorString;m_reply->ignoreSslErrors();
}
#endif