[dbus-cplusplus-devel] Assertion error with MessageIter - arguments to dbus_message_iter_open_container() were incorrect

[Roy S. (RBEI/ECG1) <Roy...@in...>]

Hi,

I am using the dbus-c++ binding to create a proxy for connman's Service API which is exposed on dbus.
The method found in connman's Service interface xml, looks like so:

        <method name="GetProperties">
        <arg type="a{sv}" direction="out"/>
        </method>

The proxy file that was auto-generated using "dbusxx-xml2cpp" utility,
created the method in question like so:

        Line 1:    std::map< std::string, ::DBus::Variant > GetProperties()
        Line 2:    {
        Line 3:        ::DBus::CallMessage call;
        Line 4:        call.member("GetProperties");
        Line 5:        ::DBus::Message ret = invoke_method (call);
        Line 6:        ::DBus::MessageIter ri = ret.reader();
        Line 7:        std::map< std::string, ::DBus::Variant > argout;
        Line 8:        ri >> argout;
        Line 9:        return argout;
        Line 10:    }


It's on Line 8, that I get the warning/error,
on x86 running Ubuntu 11.04 with libdbus-c++-1-0 package(0~20110310-1ubuntu1):

process 30342: arguments to dbus_message_iter_open_container() were incorrect, assertion "(type == DBUS_TYPE_STRUCT && contained_signature == NULL) || (type == DBUS_TYPE_DICT_ENTRY && contained_signature == NULL) || (type == DBUS_TYPE_VARIANT && contained_signature != NULL) || (type == DBUS_TYPE_ARRAY && contained_signature != NULL)" failed in file dbus-message.c line 2677.
This is normally a bug in some application using the D-Bus library.
process 30342: dbus message iterator looks uninitialized or corrupted

....and lots more..... But the process does not terminate/abort here.

On meego however, running on an arm based target,
the process TERMINATES after this assertion error!

The package used in meego on the arm based board is:
        libdbus-c++-0.5.1-4.3.armv7hl.rpm
        libdbus-c++-devel-0.5.1-4.3.armv7hl.rpm

Please help in resolving this issue.
Is there another way in which the iterator can insert the DICT value - (std::map< std::string, ::DBus::Variant > ) without throwing these assertion errors?

Any help woule be appreciated.

-Roy Samuel.