2.2.1.1 MESSAGE_PACKET

The MESSAGE_PACKET structure defines the initial message fields that are contained by all MTAGs in this protocol, as specified in [MS-CMP] section 2.2.2.


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MsgTag

fIsMaster

dwConnectionId

dwUserMsgType

dwcbVarLenData

dwReserved1

MsgTag (4 bytes): A 4-byte integer value that describes the OLE transaction message type. For all uses in this document, this value MUST be MTAG_USER_MESSAGE, as specified in [MS-CMP] section 2.2.8.

fIsMaster (4 bytes): A 4-byte value that indicates the direction of the message in the conversation.

This value MUST be one of the following values.

Value

Meaning

0x00000000

The message is sent by the party that accepted the connection.

0x00000001

The message is sent by the party that initiated the connection.

dwConnectionId (4 bytes): A 4-byte integer value that MUST contain the unique identifier for the associated connection.

dwUserMsgType (4 bytes): This field contains the message type identifier. Each MTAG that is defined in this section MUST specify a distinct value for this field for a specified connection type.

dwcbVarLenData (4 bytes): An unsigned 4-byte integer value that MUST contain the size, in bytes, of the message buffer that contains the MESSAGE_HEADER structure, minus the size, in bytes, of the MESSAGE_HEADER structure itself.

dwReserved1 (4 bytes): Reserved. This value MUST be set to an implementation-specific value and MUST be ignored on receipt.

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