PROPID_M_SENDERID_TYPE

The PROPID_M_SENDERID_TYPE property specifies the type of sender identifier found in PROPID_M_SENDERID.

Type Indicator

VT_UI4 (or VT_NULL)

PROPVARIANT Field

ulVal

Property Values

This property can have one of the following values:

MQMSG_SENDERID_TYPE_SID

The default. PROPID_M_SENDERID contains the SID of the user sending the message.

MQMSG_SENDERID_TYPE_NONE

No identifier is attached to the message.

Remarks

If the sending application does not want MSMQ to attach a sender identifier to a message, it can specify MQMSG_SENDERID_TYPE_NONE when passing PROPID_M_SENDERID_TYPE to MQSendMessage. This suppresses the message's PROPID_M_SENDERID property.

The receiving application can pass PROPID_M_SENDERID_TYPE to MQReceiveMessage to determine what type of sender identifier was attached to the message. The returned value for PROPID_M_SENDERID_TYPE can be one of the following:

• MQMSG_SENDERID_TYPE_NONE: No identifier was attached to the message.
  
  
• MQMSG_SENDERID_TYPE_SID: The sending user's SID was attached to the message.

When the receiving application specifies PROPID_M_SENDERID_TYPE, the corresponding VT field in the aPropVar array can be set to VT_NULL.

Local users (users not logged into a Windows NT domain) cannot attach an SID to a message. The SID of a local user is only valid locally.

See Also

MQReceiveMessage, MQSendMessage, PROPID_M_SENDERID

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