2.2.4.1 MESSAGE_PACKET
The MESSAGE_PACKET structure defines the initial message fields that are contained by all message tags (MTAG)s in this protocol, as specified in [MS-CMP] section 2.2.2.
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MsgTag |
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fIsMaster |
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dwConnectionId |
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dwUserMsgType |
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dwcbVarLenData |
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dwReserved1 |
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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 0x00000FFF, which indicates MTAG_USER_MESSAGE message, as specified in [MS-CMP] section 2.2.8.
fIsMaster (4 bytes): A 4-byte value indicating the direction of the message in the conversation.
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This value MUST be one of the following values.
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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_PACKET structure, minus the size, in bytes, of the MESSAGE_PACKET structure itself.
dwReserved1 (4 bytes): Reserved. This value MAY be set to any implementation-specific value and MUST be ignored on receipt.<9>