The PROPID_M_SIGNATURE_LEN property indicates the length of the message's digital signature.
The PROPID_M_SIGNATURE_LEN property is used for messages sent with a digital signature to an MSMQ Connector.
When passing PROPID_M_SIGNATURE_LEN to MQReceiveMessage, the corresponding VT field in the aPropVar array can be set to VT_NULL.
Windows NT: Requires version 4.0 SP3 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in mq.h.
Import Library: Use mqrt.lib.
Unicode: Defined only as Unicode.
MQReceiveMessage, PROPID_M_SIGNATURE