The MQGetInt64Property function passes back the value of the MQInt64 property for the specified key.
| MQGetint64Property (const MQPropertiesHandle propertiesHandle,
                          ConstMQString key,
                          MQInt64 * value); | 
MQStatus. See the MQStatusIsError() function for more information.
A properties handle for the key you want to get.
The name of a property key.
Output parameter for the property value.
MQ_NOT_FOUND MQ_INVALID_TYPE_CONVERSION