Property Structures

MSMQ uses three property structures: MQQUEUEPROPS for queue properties, MQMSGPROPS for message properties, and MQQMPROPS for Queue Manager properties. All three structures have the following four members:

A count (cProp), indicating how many properties are supplied. This is a double word member field (DWORD) included in all three property structures.
An array of PROPID values (aPropID) identifying which properties are specified for the call. MSMQ uses three different property identifiers: QUEUEPROPID, MSGPROPID, and QMPROPID. These identifiers are used for MSMQ queue properties, message properties, and Queue Manager properties, respectively. These identifiers are all of type PROPID.
An array of PROPVARIANT structures (aPropVar) containing the values of the properties. Position i in this array is the value of the property whose identifier (PROPID value) is in position i in its respective aPropID array.
An array of HRESULT values (aStatus) returned by MSMQ. Position i in this array is a reported status code of the property whose identifier and value are in position i in the arrays discussed earlier. This array is optional.

For information on the specific property structures, see MQQUEUEPROPS, MQMSGPROPS, and MQQMPROPS.