How could you pass a nested container as an argument to an exposed DBus routine?

[digital_aspirin]

Hi everyone,
I would like to pass a QVariantList as an argument to a remotely called procedure using DBus. One of the items stored in the container is a QVariantMap which when I attempt to convert it from QVariant to QVariantMap the conversion fails. For instance:



void Ping::sendPing()
{
QVariantMap mPingMap;
mPingMap.insert("key1", "map: Ping says hello");
mPingMap.insert("key2", 456);

QVariantList lPingData;

lPingData << "list: Ping says hello" << 123 << mPingMap;

interfaceCallToPong->test(lPingData);
}

// The remote method:


void Pong::test( QvariantList lRemoteData )
{
qDebug() << lRemoteData.at(0).toString();
qDebug() << lRemoreData.at(1).toInt();


QVariant qvMap = lRemoteData.at(3); // Get the variant that contains the QVariantMap

qvMap.canConvert< QVariantMap > (); // returns false. Why?

// As a result I got no valid data for the following.
QVariantMap mRemoteMap = lRemoteData.at(3).toMap();

qDebug() << mRemoteMap.value("key1").toString ();
qDebug() << mRemoteMat.value("key2").toInt();
}

the output is:
list: Ping says hello
123
0
0

Apparently I am doing something wrong, unless we cannot pass nested containers as an argument to a remotely called procedure using DBus. Could you please help me out?

[stampede]

lPingData << "list: Ping says hello" << 123 << mPingMap;
///
qDebug() << lRemoteData.at(0).toString();
qDebug() << lRemoreData.at(1).toInt();
QVariant qvMap = lRemoteData.at(3); // are you sure not at(2) ?

For me it looks like the map argument is at index number 2, not 3 :)

[digital_aspirin]

Yes you are right, it's a typo though. I have also tried to send a QVariantMap which one of its items is a QVariantList but the latter is empty at remote end as well. Although all data can be retrieved at source end before doing the remote procedure call.

[stampede]

I've just read the QtDbus docs:


All of the QtDBus types (primitives and user-defined alike) can be used to send and receive messages of all types over the bus.
Warning: You may not use any type that is not on the list above, including typedefs to the types listed. This also includes QList<QVariant> and QMap<QString,QVariant>.

Looks like you can't use those types. I have 0 experience with DBus programming, but maybe you can try with QDBusVariant.