How to modify data and save to json file?

[Pablo J. Rogina]

@josht000 please don't forget to mark your post as solved!

[SGaist]

@Pablo-J-Rogina it's not the original author of this thread ;-)

[yashnikam]

How to add phone numbers in this code snippet?

[jsulm]

@yashnikam In the same way it is done for address...

[the woft]

@SGaist I want to change the value of FirstName and Age , it has no object to find , pls help me !

[JonB]

@the-woft
FirstName and Age are in the RootObject just like Address is. Their values will be a string and an integer respectively, so retrievable via QString QJsonValue::toString() const & int QJsonValue::toInt(int defaultValue = 0) const and modifiable via QJsonValueRef QJsonObject::operator[](const QString &key).

[the woft]

@JonB said in How to modify data and save to json file?:

FirstName and Age are in the RootObject just like Address is. Their values will be strings, so retrievable via QString QJsonValue::toString() const and modifiable via QJsonValueRef QJsonObject::operator[](const QString &key).

i'm newbie in qt and i try it but not correct , you can give me sample code do it ?

[jsulm]

@the-woft said in How to modify data and save to json file?:

and i try it but not correct

Then show what you tried.
There is example code in documentation and example applications like https://doc.qt.io/qt-6/qtcore-serialization-savegame-example.html

[the woft]

@jsulm this my code
QJsonValue Age = root_object.value("Age");
QVariant tmp = Age.toVariant();
qlonglong result = root_object.value("Age").toVariant().toLongLong();
QJsonValueRef ref = RootObject("result");
QJsonObject m_addvalue = ref.toObject();

[JonB]

@the-woft
You read the Age entry in root_object but where do you set the Age entry in root_object? You don't. I gave you the reference to QJsonValueRef QJsonObject::operator[](const QString &key) to use.

[the woft]

@JonB was exactly what I was looking for, and it worked great. Thanks!!!!

[JonB]

@the-woft For other readers you might post the line of code you added to set rootObject["Age"] correctly.