[SOLVED]how to traverse QMap as this QMap< QString, QMap< QString,QStringList > >?

freebigfish

Hi,all.I'm faced a problem that traverse an QMap like this QMap< QString, QMap< QString,QStringList > >,but I failed.Can someone give me an advice?

IamSumit

Hi.
and welcome to Qt devnet.

You can do it in either way.
Qt provides two ways : Java-style iterator and STL-style iterator

1 .Java-style iterator

@
QMap< QString, QMap< QString,QStringList > > map1;
QMap< QString,QStringList > map2,temp;

QMapIterator<QString, QMap< QString,QStringList > > i1(map1);
while (i1.hasNext())
{
i1.next();
qDebug() <<"@"<< i1.key() << ": " << i1.value() << endl;

temp = i1.value();

QMapIterator<QString, QStringList> i2(temp);
while (i2.hasNext())
{
i2.next();
qDebug()<<"@@" <<i2.key() << ": " << i2.value() << endl;
QStringList strListTemp=i2.value();
foreach(QString str,strListTemp)
{
qDebug()<<"list :"<<str;
}
}

}

@

2.STL-style iterator

@
QMap< QString, QMap< QString,QStringList > >::const_iterator i1 = map1.constBegin();
while (i1 != map1.constEnd())
{
qDebug() << i1.key() << ": " << i1.value() << endl;
temp = i1.value();

QMap< QString,QStringList > ::const_iterator i2 = temp.constBegin();

while (i2 != temp.constEnd())
{
qDebug() << i2.key() << ": " << i2.value() << endl;
QStringList strListTemp=i2.value();
foreach(QString str,strListTemp)
{
qDebug()<<"list :"<<str;
}
++i2;

}
++i1;

}
@

Hope this helps.

freebigfish

Thanks a lots! And how can i insert an item to the QStringList in the map?

IamSumit

Hi.
it is not a tough ask.
you should do it your owns.
The logic should be yours.i just can guide you ;not to do your job.

BTW. There is a lot of insertion functions/mechanism.Have a look on Qt Docs and examples.

freebigfish

Thanks again for reply.i'm a newbiee and faced this problem for long time. with your help,i resolved this problem finally.before that,i used your code with error.

IamSumit

That's nice.
Now Please add thread title as [SOLVED] so other members can notify that soultion has been found.