How to Write Data to json file From Qt

[Raji]

Hi i am New to Qt , I am Practicing How to Insert the data to json file .Unable to insert the data to devip
Tried following way please help me .
{
"connection":{
"type":"ETH10G",
"param":{
"devip":"192.168.0.166",
"localip":"192.168.0.160",
"stream_port":15560,
"control_port":15561,
"event_port":15562
}
}
QFile file1("vlcfg_sim.json");
file1.open(QIODevice::ReadOnly | QIODevice::Text);
QJsonParseError JsonParseError1;
QJsonDocument JsonDocument1 = QJsonDocument::fromJson(file1.readAll(), &JsonParseError1);
file1.close();
QJsonObject RootObject = JsonDocument1.object();
QJsonObject connectionData = RootObject["connection"].toObject();
QJsonObject param2Data = connectionData["param"].toObject();

QJsonValueRef ref = RootObject.find("connection").value() ;
QJsonObject m_addvalue = ref.toObject();
m_addvalue.insert(key,name);//set the value you want to modify
ref=m_addvalue; //assign the modified object to reference
JsonDocument1.setObject(RootObject); // set to json document
file1.open(QFile::WriteOnly | QFile::Text | QFile::Truncate);
file1.write(JsonDocument1.toJson());
file1.close();

unable to write the data into param->devid, please can you any one help .

[sierdzio]

Are you getting any errors? Or resulting file is wrong? Please provide more information.

[Raji]

@sierdzio Result file is wrong , i want to modify/insert the below data values of both at same time
connection->type
connection->param->devip

[JonB]

@Raji
You have already shown that you know how to get a reference to a value/object, so that you can make changes. param->devip is a keyed value inside param in just the same way that connection->param is a keyed object inside connection. You can either remove() and re-insert() your type & devip inside their parents, or you can use QJsonValueRef to overwrite the value already there. Then you save back when you have done both.

[Raji]

@JonB : Thank you , but while writing to file param value saving into connection
Ex: connection{
type: " value"
devip: " 113"
param{
}
}
getting like this, but i need devip inside param

[JonB]

@Raji
But you don't show the code you are using to do this, do you? As I have already said, you want to find devip and add/remove/change inside the param node, and you are clearly not doing that and just putting it inside the connection node. Where does your code use param to locate that node?