qtdeclarative/examples/declarative/cppextensions/networkaccessmanagerfactory/main.cpp

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#include <QGuiApplication>
#include <QNetworkAccessManager>
#include <QNetworkProxy>

#include <QDeclarativeEngine>
#include <QDeclarativeNetworkAccessManagerFactory>
#include <QtQuick/QQuickView>


/*
   This example illustrates using a QDeclarativeNetworkAccessManagerFactory to
   create a QNetworkAccessManager with a proxy.

   Usage:
     networkaccessmanagerfactory [-host <proxy> -port <port>] [file]
*/

static QString proxyHost;
static int proxyPort = 0;

class MyNetworkAccessManagerFactory : public QDeclarativeNetworkAccessManagerFactory
{
public:
    virtual QNetworkAccessManager *create(QObject *parent);
};

QNetworkAccessManager *MyNetworkAccessManagerFactory::create(QObject *parent)
{
    QNetworkAccessManager *nam = new QNetworkAccessManager(parent);
    if (!proxyHost.isEmpty()) {
        qDebug() << "Created QNetworkAccessManager using proxy" << (proxyHost + ":" + QString::number(proxyPort));
        QNetworkProxy proxy(QNetworkProxy::HttpCachingProxy, proxyHost, proxyPort);
        nam->setProxy(proxy);
    }

    return nam;
}

int main(int argc, char ** argv)
{
    QUrl source("qrc:view.qml");

    QGuiApplication app(argc, argv);

    for (int i = 1; i < argc; ++i) {
        QString arg(argv[i]);
        if (arg == "-host" && i < argc-1) {
            proxyHost = argv[++i];
        } else if (arg == "-port" && i < argc-1) {
            arg = argv[++i];
            proxyPort = arg.toInt();
        } else if (arg[0] != '-') {
            source = QUrl::fromLocalFile(arg);
        } else {
            qWarning() << "Usage: networkaccessmanagerfactory [-host <proxy> -port <port>] [file]";
            exit(1);
        }
    }

    QQuickView view;
    view.engine()->setNetworkAccessManagerFactory(new MyNetworkAccessManagerFactory);

    view.setSource(source);
    view.show();

    return app.exec();
}