PROPID_M_APPSPECIFIC (Windows CE 5.0)
This property specifies application-generated information such as single integer values or application-defined message classes.
- Type Indicator
VT_UI4 (or VT_NULL) - PROPVARIANT Field
ulVal - Property Values
Unsigned integer. The default is 0.
Remarks
You can use application-specific information to organize different types of messages.
For example, several sending applications might be sending messages to a common queue. If each application uses a different application-specific index, the receiving application can use PROPID_M_APPSPECIFIC to filter out the messages from a single sending application.
To set application-specific information, specify PROPID_M_APPSPECIFIC in the MQMSGPROPS structure and call MQSendMessage.
To retrieve application specific information, specify PROPID_M_APPSPECIFIC in the MQMSGPROPS structure. Then call MQReceiveMessage and examine its returned value.
When specifying PROPID_M_APPSPECIFIC, you can set its Type Indicator to VT_NULL.
When the Type Indicator is set to VT_NULL, MSMQ sets the VT field to the appropriate type indicator.
In addition to application-specific information, you can use the PROPID_M_CORRELATIONID message property for filtering.
Examples
This example shows how PROPID_M_APPSPECIFIC is specified in the MQMSGPROPS structure.
aMsgPropId[i] = PROPID_M_APPSPECIFIC; // Property ID
aMsgPropVar[i].vt = VT_UI4; // Type indicator
aMsgPropVar[i].ulVal = dwAppspecificIndex; // Value
i++;
Requirements
OS Versions: Windows CE 2.0 and later. Versions prior to 2.12 require the MSMQ add-on pack.
Header: Mq.h.
See Also
MQReceiveMessage | MQSendMessage | PROPID_M_CORRELATIONID | MQMSGPROPS
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