how to remove json object key and valyue in QT/c++? - c++

Question

I have a json file as shown below
{
"TestId:1": {
"FILE ID": "223",
"CLASS": "rame",
"PLATFORM": "test"
},
"TestId:2": {
"FILE ID": "123",
"CLASS": "raj",
"PLATFORM": "test2"
}
}
I want to remove the "TestId:2" key content.
I tried delete obj["TestId:2"]; but that did not worked. It is deleting only the key "TestId:2"
I want to delete key with the value.
Can someone help me on this?

Answer 1

You need to create a QJsonObject to edit it.
First, read your file:
QFile file("myfile.json"); // to replace with you file name
file.open(QIODevice::ReadOnly);
QByteArray data = file.readAll();
file.close();
Then, create the QJsonDocument with the data from the file:
QJsonParseError error;
QJsonDocument doc = QJsonDocument::fromJson(data, &error);
Then get the root object of the document:
QJsonObject root = doc.object();
Remove the element in the object, for exemple:
root.remove("TestId:2");
Then create a new document with the modified element:
doc = QJsonDocument(root);
And finally write the file again:
file.open(QIODevice::WriteOnly);
file.write(doc.toJson());
file.close();
And that should do the job.
As usual, there are many checks to add everywhere (file open, JSON parsing, etc).