Re: Internally described files with null data

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

Hello David,

I am guessing that your friend is trying to create a file editor.  The only way 
I know of to handle generic 
program-described files is with C.  I am not certain but I am fairly sure that 
C can handle null-capable 
program-described files.  Of course, the actual file must be externally 
described otherwise it couldn't have 
null fields.  The only difficulty is dynamically handling the null-byte map.

Regards,
Simon Coulter.

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//--- forwarded letter -------------------------------------------------------
> X-Mailer: Internet Mail Service (5.5.1960.3)
> Date: Wed, 13 Jan 99 10:31:55 -0600
> From: "David Gibbs" <David.Gibbs@IL.US.MKS.com>
> To: "'Midrange Mailing List'" <MIDRANGE-L@midrange.com>
> Reply-To: MIDRANGE-L@midrange.com
> Cc: "Bob Crafer" <Bob.Crafer@IL.US.MKS.com>,
>     "Brian Anderson" <Brian.Anderson@IL.US.MKS.com>
> Subject: Internally described files with null data

> 
> Folks:
> 
> An associate of mine is trying to do some strange stuff with internally
> described files... and he's running into problems with NULL data in a
> field.
> 
> Basicly, we're trying to extract data from a file that is internally
> described... but when we encounter null data in a field (either alpha or
> date) we get "Message . . . . :      CPF5029   Data mapping error on
> member CVRGCOMP [...] error code 19.  19 -- An unexpected null field was
> found."
> 
> We're defining a bunch of "I" specs for the maximum file size and then
> extracting the field information based on a DSPFFD output.
> 
> Apparently the ALWNULL parameter on CRTBNDRPG only applies to externally
> described files.
> 
> Any suggestions on how to deal with this error?
> 
> Thanks!
> 
> David

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