QUrl parsing in QT 5 - c++

Question

I have a QUrl as this:
https://www.example.com/index.html#token=SomeToken&user=guest
and I want to obtain the value of the token i.e. SomeToken. I know about method QUrl::queryItemValue,so this code must work:
void MainWindow::get_token(QUrl url)
{
url = url.toString().replace("?","#");
QString token = url.queryItemValue("token");
}
but in Qt5 i can't use this method,how can I parse url?

Answer 1

There is new QUrlQuery class in Qt5. New QUrl doesn't support this method yet, so you should use QUrlQuery for parsing (it has this and other methods). Use
QUrlQuery query(url);
qDebug() << query.queryItemValue("token");
Note: be carefull with replace because QUrlQuery gives you correct result with
?token=SomeToken not a #token=SomeToken
http://qt-project.org/doc/qt-5/qurlquery.html

Answer 2

QUrlQuery queryItemValue method does not work properly in Qt 5.9 So i wrote my own function to parse GET parameters
#include <QCoreApplication>
#include <QUrlQuery>
#include <QDebug>
#include <QMap>
#include <QUrl>
QMap<QString,QString> ParseUrlParameters(QString &url)
{
QMap<QString,QString> ret;
if(url.indexOf('?')==-1)
{
return ret;
}
QString tmp = url.right(url.length()-url.indexOf('?')-1);
QStringList paramlist = tmp.split('&');
for(int i=0;i<paramlist.count();i++)
{
QStringList paramarg = paramlist.at(i).split('=');
ret.insert(paramarg.at(0),paramarg.at(1));
}
return ret;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QString url = "http://test1.ru/?token=test&email=test1";
QUrlQuery query(url);
qDebug() << "queryItemValue does not work in Qt 5.9.0 with dynamic QString" << query.queryItemValue("token") << "("<< endl;
qDebug() << "ParseUrlParameters(...) works fine..."<< endl;
QMapIterator<QString, QString> i(ParseUrlParameters(url));
while (i.hasNext())
{
i.next();
qDebug() << i.key() << ":" << i.value();
}
return a.exec();
}

Answer 3

I know this post is old but if my answer can help someone, I share :)
Tested under QT 5.15.2 and under QT 6.4.2
#include<QUrl>
#include<QUrlQuery>
#include<QDebug>
int main (int nbArg, char* listArg[])
{
// Initialization
QString myString = "https://www.factice.fr/demo.php?thing=123&subject=456&artificial=789";
QUrl myUrl(myString);
QUrlQuery myQuery(myUrl);
QMap<QString,QString> paramList; // Associative Array to Store Keys and Values
// For Each QPair
for(int i=0;i<myQuery.queryItems().size();i++)
{
// Information Display
qDebug() << myQuery.queryItems().at(i).first << " : " << myQuery.queryItems().at(i).second;
// Or Storage of Information for futur use
paramList.insert(myQuery.queryItems().at(i).first,myQuery.queryItems().at(i).second);
}
// End - For Each QPair
// Examples of Displaying Stored Information
qDebug() << paramList;
qDebug() << paramList["thing"];
}