How can we count the number of Messages in the Queue?

The following script using ODK functions returns the number of messages in the Alarm Logging quque in a WinC CTag:

DWORD dwMsgService, dwMsgs;
MSRTStartMsgService( &dwMsgService, NULL, NULL, 0, NULL, NULL );
MSRTGetMsgActual( &dwMsgs, NULL );
MSRTStopMsgService( dwMsgService, NULL );
SetTagWord("TagName",dwMsgs);