Get Dos errorlevel

 BBS: Inland Empire Archive
Date: 02-26-94 (07:50)             Number: 277
From: STEVE MCCRYSTAL              Refer#: NONE
  To: GARY GLUECKERT                Recvd: NO  
Subj: Get Dos errorlevel             Conf: (2) Quik_Bas

;
In a msg of <24 Feb 94>, Gary Glueckert writes to Harry F. harrison:
;
Gary,

 GG> The DOS errorlevel is stored in an interrupt in memory and is not
 GG> reset by another copy of command.com.

Correct!

 GG>  Remember also that not all of Command.com is transient.

Correct!

 GG> FUNCTION ErrorLevel% ()

 GG>    'Purpose : To check the error level of a program returning
 GG> from shell
 GG>    'Input   : none (well, helps if you did shell a program first)
 GG>    'Return  : The errorlevel returned from the last shelled
 GG> program

 GG>    DEF SEG = 0
 GG>    ErrorLevel% = PEEK(&H4FE)
 GG>    DEF SEG
 GG> END FUNCTION

Do you have any more info on this? Is the address guaranteed? Is it
stable across different DOS versions? Can you suggest a documenting reference?

Please don't misunderstand... I'm not disagreeing with you.
I would like to dig into this a bit further because the
concept has LOTS of potential uses and is (to my knowledge)
largely unexplored, as is the DOS
Interapplication Communication area which I use frequently.

-[Steve]-

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