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Stuart Rowe wrote:
You MUST not use the E (external) file type if you intend to use IO with
structures, IIRC. You have to use "F" and state the record length. The
structure size must then match this record length exactly.
Actually, from V5 on, you can read into a DS on a file that's declared
and opened as externally-described.
And while the DS has to match the DECLARED record length, it does NOT
have to match the ACTUAL record length, which is useful when you are
dealing with files whose exact record length and structure are unknown
at compile time, but easily predictable, and known at runtime. It seems
to work somewhat better than, for example, turning off level-checking on
the file itself.
--
JHHL
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