How to Seperate QVariantMap values into individual elements

Praveen.Illa

Hi All,

I have a QVariantMap map =
(QVariant(QVariantList, (QVariant(QString, "1"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "6"), QVariant(QString, "12"), QVariant(QString, "4"))), QVariant(QVariantList, (QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "6"), QVariant(QString, "14"))), QVariant(QVariantList, (QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "8"), QVariant(QString, "14"))), QVariant(QVariantList, (QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "9"), QVariant(QString, "16"))), QVariant(QVariantList, (QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "10"), QVariant(QString, "16"))), QVariant(QVariantList, (QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "11"), QVariant(QString, "18"))), QVariant(QVariantList, (QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "12"), QVariant(QString, "20"))), QVariant(QVariantList, (QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "14"), QVariant(QString, "24"))))

How can I seperate the above data into QVariantList and to individual values.

jsulm

@Praveen-Illa From documentation:

typedef QVariantMap

Synonym for QMap<QString, QVariant>.

If you want to know how to use QMap: https://doc.qt.io/qt-5/qmap.html

Praveen.Illa

@jsulm - Thanks for Quick response.
I have used QMapIterator as below
QMapIterator<QString, QVariant> i(map);
while (i.hasNext())
{
i.next();
qDebug() << i.key() << ": " << i.value();
}
The output is Key : Value
"Period 1" : QVariant(QVariantList, (QVariant(QString, "1"), QVariant(QString, "1"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "0"), QVariant(QString, "1"), QVariant(QString, "6"), QVariant(QString, "12"), QVariant(QString, "4")))

Now, again I need to seperate the value part to individual QStrings. How can I do that ??

jsulm

This post is deleted!

jsulm

@Praveen-Illa So, your value is QVariantList? Then you can simply iterate over the list as usual.

typedef QVariantList

Synonym for QList<QVariant>.

Praveen.Illa

@jsulm
I have tried like below, but getting error " error: error: conversion from ‘const QVariant’ to non-scalar type ‘QVariantList {aka QList<QVariant>}’ requested"

QMapIterator<QString, QVariant> i(map);
while (i.hasNext())
{
i.next();
qDebug() << i.key() << ": " << i.value();
QVariantList list = i.value();
}

Could you please suggest ?

KroMignon

@Praveen-Illa said in How to Seperate QVariantMap values into individual elements:

QVariantList list = i.value();

your map is an instance of QVariantMap which is a typedef of QMap<QString, QVariant>
This means i.value() is a QVariant.

Now you know that is variant holds a QVariantList (which is a typedef of QList<QVariant>):

if (i.value().canConvert<QVariantList>()) {
    QSequentialIterable iterable = i.value().value<QSequentialIterable>();
     foreach (const QVariant &v, iterable) {
         qDebug() << v;
     }
}

==> Read documentation for more details: =>https://doc.qt.io/qt-5/qvariant.html#canConvert

i.value() will returns what it is ==> a QVariant.
To get the holded value you have to "cast" ==> i.value().value<QVariantList>();

Praveen.Illa

@KroMignon and @jsulm - Thank you both for your inputs and it was working now.