sending QMap<enum, QString> over Qt DBus

Venkateswaran

I Tried to send QMap<enumType, QString> over Qt DBus but I'm getting below error.

QDBusMarshaller: type 'test::TEST_ENUM' (1026) cannot be used as the key type in a D-BUS map.
QDBusMarshaller: type `QMap<test::TEST_ENUM',QString>' produces invalid D-BUS signature `<empty>' (Did you forget to call beginStructure() ?)
QDBusMarshaller::appendVariantInternal: Found unknown D-BUS type ''
QDBusMarshaller::appendVariantInternal: Found unknown D-BUS type ''

TEST_ENUM is my enum type defined under test namespace.
I registered both the enum type and QMap with qDBusRegisterMetaType.

In header file

using testMap = QMap<TEST_ENUM, QString>;
Q_DECLARE_METATYPE(test::TEST_ENUM)

In CPP file

defined operator<< & operator>> for test::TEST_ENUM

qDBusRegisterMetaType<test::TEST_ENUM>();
qRegisterMetaType<test::TEST_ENUM>("test::TEST_ENUM");
qDBusRegisterMetaType<test::testMap>();