Message metadata driver control
The message contains metadata structure. One of the elements of this structure
is a character string known as "driver control," referred to as
DRIVERCTL
. This string can be used to insert protocol-specific
information. For the WebSphere MQ protocol, this information consists of the
MQMD
values.
You can set any MQMD
fields that are specified in this keyed
list. Similarly, modify this keyed list to contain the MQMD values each time a message
is read. This facilitates the getting of MQMD
message values by Tcl.
msgmetaset (a Tcl extension) is the command used
to change the msg_driver_control
string. The
DRIVERCTL
key value is used with this command to indicate that
msg_driver_control
is to be changed.