Messages
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On AS/400, communication between procedures or programs, between jobs, between users occurs through messages
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A message can be predefined or immediate
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A predefined message is created and exists outside the program that uses it.
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An immediate message is created by the sender at the time it is sent. It is not stored in any message file
Predefined Messages
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A predefined message in a message file is uniquely identified by a seven character identifier and is defined by a message description
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Message description contains
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First Level Message (148 characters)
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Second Level Message (3016 characters)
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Severity Level
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Valid Reply Values
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Default Reply Values
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Other Attributes
Message Files
vCreate Message File Command- CRTMSGF
Example:
*CRTMSGF +
MSGF(LSSLIB/USRMSGF) +’
SIZE (164 *NOMAX) +
AUT (*PUBLIC) +
TEXT(‘USER MESSAGE FILE”) +
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Other Commands : DLTMSG, MRGMSGF, CHGMSGF
Message Description
-Use ADDMSGD to add predefined messages and to add them to the message file.
-In the message description, you can specify
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Message text
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Message help text
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Severity code
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Validity checking values for a reply
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Default message handling action for the escape messages
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Creation level
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Alert options
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Entry in the error log
Example:
ADDMSGD +
MSGID (ABC1234) +
MSGF (INVENT/STORE) +
MSG (‘ENTER ITEM CODE’)
SECLVL (‘VALID CODES &NA1, &BB2, &PC3’) +
SEV (30) +
TYPE (*CHAR) +
LEN (2) +
DFT (XX)
Other Commands: RMVMSGD, CHGMSGD, DSPMSGD, WRKMSGD