[dbus-cplusplus-devel] Problem with the DBus::MessageIter::operator>>( DBus::MessageIter & iter, DBus::Variant & val )

[asdfffdsa <n8...@gm...>]

Hello, I am new to dbus-c++.  I am very enthusiastic about this project (and
the dbus and hal projects).  I've installed dbus-c++ from the Archlinux User
Repository ( dbus-c++ 20090929-1 ).  I will be downloading the source over
night to further inspect the problem (my ISP has a very strict usage
policy).

I seem to be having a problem with the DBus::MessageIter::operator>>(
DBus::MessageIter & iter, DBus::Variant & val ) function ( declaration is in
types.h ).  I've used the "dbusxx-xml2cpp" binary to generate proxy pattern
classes.

*Here is my code:*
// halDeviceProxy is a variable of a dbusxx-xml2cpp-generated proxy class
for the "org.freedesktop.Hal.device" interface
::DBus::Variant variant = halDeviceProxy.GetProperty(
std::string(propertyName) );


*Here is the dbusxx-xml2cpp-generated proxy code:*
::DBus::Variant GetProperty(const std::string& key)
{
        ::DBus::CallMessage call;
        ::DBus::MessageIter wi = call.writer();
        wi << key;
        call.member("GetProperty");
        ::DBus::Message ret = invoke_method(call);
        ::DBus::MessageIter ri = ret.reader();

        ::DBus::Variant argout;
        ri >> argout;  *// this line causes an exception to be thrown*
        return argout;
}


*The "ri >> argout" call is causing the following error/exception:*
terminate called after throwing an instance of 'DBus::ErrorInvalidArgs'
  what():  variant type expected
Aborted


Naturally, "ri >> argout" is passing in a variant type, so I'm not sure what
the problem is.  The odd thing about this is that functions such as
GetAllProperties() work fine (which returns a
std::map<std::string,DBus::Variant>).

I will be looking over the source when I get a chance, but if anyone has any
ideas in the mean time, it would be very helpful.