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PROPID_M_FIRST_IN_XACT (Windows Embedded CE 6.0)

  • Article

1/6/2010

This property indicates whether the message was the first message sent in a transaction.

  • Property ID
    PROPID_M_FIRST_IN_XACT
  • Type Indicator
    VT_UI1
  • MQPROPVARIANT Field
    bVal

  • Property Values
    The following values can be used.

    Value Description

    MQMSG_FIRST_IN_XACT

    The message was the first message sent in the transaction.

    MQMSG_NOT_FIRST_IN_XACT

    The message was not the first message sent in the transaction.

Remarks

The PROPID_M_FIRST_IN_XACT property is available for MSMQ 2.0 and later.

It is used by receiving applications to verify that a message was the first message sent in a single transaction to a single queue.

To verify transaction boundaries, use PROPID_M_FIRST_IN_XACT with the following properties:

  • PROPID_M_LAST_IN_XACT, which is a property for checking the last message sent in a transaction
  • PROPID_M_XACTID, which is a property for retrieving the identifier of the transaction

If only one message is sent in a transaction, PROPID_M_FIRST_XACT and PROPID_M_LAST_XACT are set.

Examples

The following code example shows how PROPID_M_FIRST_IN_XACT is specified in the MQMSGPROPS structure.

aMsgPropId[i] = PROPID_M_FIRST_IN_XACT; // Property ID
aMsgPropVar[i].vt = VT_UI1;             // Type indicator
i++;
...

msgprops.aPropVar = aMsgPropVar;
...

MQReceiveMessage(hQueue, ..., &msgprops, ...);

...
i++;
if(aMsgPropVar[i].bVal == MQMSG_FIRST_IN_XACT)
{

See Also

Reference

MSMQ Properties
PROPID_M_LAST_IN_XACT
PROPID_M_XACTID