如何使用Qt获取系统代理？

Question

I have the following code that I am trying to extract the systems proxy settings from:

QList<QNetworkProxy> listOfProxies = QNetworkProxyFactory::systemProxyForQuery();
foreach ( QNetworkProxy loopItem, listOfProxies ) {
    qDebug() << "proxyUsed:" << loopItem.hostName();
}

I only get one item back and with a blank host name. Any ideas what I am missing?

Answer 1

By putting:

QNetworkProxyQuery npq(QUrl("http://www.google.com"));
QList<QNetworkProxy> listOfProxies = QNetworkProxyFactory::systemProxyForQuery(npq);

I appear get the proxy out.

Answer 2

QNetworkProxyQuery npq(QUrl( QLatin1String (" http://www.google.com ")));

Don't forget to use QLatin1String :)