FILEREAD attempts to read z storage units (bytes) from
file x into location y. It returns the number
of storage units actually read.
 >>-FILEREAD(x,y,z)---------------------------------------------><
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- x
- File reference.
- y
- Expression with type POINTER or OFFSET. If the type is OFFSET,
the expression must be an OFFSET variable declared with the AREA
attribute.
- z
- Expression with computational type that is converted to FIXED
BIN(31,0).
FILEREAD can read only TYPE(U) files.
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