Nested QMap with a QHash and fetching values inside the QHash?

Calicoder

Howdy folks, hope your 2022 is going well so far. Another day trying to train myself on C++ and QT. I've been playing around with containers and noticed something odd with using QMaps. I can only fetch the outer most keys and never anything inside that.
For example, say I have this setup of a customer ID dataset:

QMap(("customerIdData", QVariant(QVariantHash, QHash(("Mike", QVariant(double, 0439.7))))))

Using the QMap.value("customerIdData") works well but this QMap.value("Mike") only shows the default 0 value. Is this possible to access that inner QHash double value?

Appreciate the help as always.

Christian Ehrlicher

Please provide some real code on how you fill and later try to read your structure.

SGaist

Hi,

Beside the code, you shall start by doing it in steps:

Get the variant from the map
Convert the variant to a hash
Extract the value you want from the hash

Calicoder

@SGaist said in Nested QMap with a QHash and fetching values inside the QHash?:

Hi,

Beside the code, you shall start by doing it in steps:

Get the variant from the map

Convert the variant to a hash

Extract the value you want from the hash

Perfect, thanks guys! This worked

QMap.first().toHash().value("Mike").toDouble()