Version (MQLONG)

This is the structure version number, and must be one of the following:

MQMD_VERSION_1: Version-1 message descriptor structure.
This version is supported in all environments.
MQMD_VERSION_2: Version-2 message descriptor structure.
This version is supported in all WebSphere® MQ V6.0 and later environments, plus WebSphere MQ MQI clients connected to these systems.

Note: When a version-2 MQMD is used, the queue manager performs additional checks on any MQ header structures that might be present at the beginning of the application message data; for further details see the usage notes for the MQPUT call.

Fields that exist only in the more-recent version of the structure are identified as such in the descriptions of the fields. The following constant specifies the version number of the current version:

MQMD_CURRENT_VERSION: Current version of message descriptor structure.

This is always an input field. The initial value of this field is MQMD_VERSION_1.