I've been using Delphi a long time, but never used Dynamic Arrays. 

If I declare "var data:array of byte" in the parameters list of a
procedure, I get an "Incompatible types" error on the statement
"SetLength(data, length)". (The othe passed parameters tell how big
the array needs to be - I'm assuming SetLength should be used before
writing to the array)

If I declare "data" as local to the procedure and don't pass it, it is
OK. 

If I declare "data" as global to the unit, and don't pass it, it is
OK.

I would prefer to pass it as a parameter so I could make use of the
results by calling my procedure from various other procedures, each
with a locally declared dynamic array of bytes.  The reference
counting of dynamic arrays should keep this straight, right?

(using D7 pro, XP pro)




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