For the most part, MSMQ messages refer to the messages your application uses to send data. However, there are also several MSMQ-generated messages (for example, acknowledgment and report messages) that provide additional functionality.
Note Each MSMQ message can have no more than 4 MB of data.
Each message, whether it is sent by an application or generated by MSMQ, receives an MSMQ-generated message identifier when it is sent. This identifier along with any other message property may be used to identify a message. Other properties typically used are application-defined identifiers, label, class, body, and so forth.
The two application-defined identifiers are the correlation identifier and application-specific identifier. By using these identifiers, you can create your own method for identifying messages.
| For information on… | See… |
|---|---|
| A list of all message properties | Message Properties |
| Sending messages to a destination queue | Sending Messages |
| Reading messages from a queue | Reading Messages |
| The correlation identifier property for C API calls | PROPID_M_CORRELATIONID |
| The application-specific identifier property for C API calls | PROPID_M_APPSPECIFIC |
| The correlation identifier property for ActiveX calls | CorrelationId |
| The application-specific identifier property for ActiveX calls | AppSpecific |