Stephen Patterson wrote, on Wednesday, February 13, 2002 2:00 PM
: I have a scalar variable which I need to run read() on, but read()
: runs only on a filehandle, and I'd like to avoid creating a temp file
: just for this one operation. Is there any way I can use the variable
: as if it were a filehandle?
Why? From the doc:
read FILEHANDLE,SCALAR,LENGTH,OFFSET
read FILEHANDLE,SCALAR,LENGTH
Attempts to read LENGTH bytes of data into variable SCALAR from
the specified FILEHANDLE. Returns the number of bytes actually
read, "0" at end of file, or undef if there was an error. SCALAR
will be grown or shrunk to the length actually read. If SCALAR
needs growing, the new bytes will be zero bytes. An OFFSET may
be specified to place the read data into some other place in
SCALAR than the beginning. The call is actually implemented in
terms of stdio's fread(3) call. To get a true read(2) system
call, see "sysread".
What part of that can't you use substr for? Or are you using sysread?
SCALAR = substr $myscalar, OFFSET, LENGTH
len(SCALAR) gets you the "bytes read" (0 for "end of myscalar"), and
it even returns undef if you try to read completely outside $myscalar.
Joe
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Joseph P. Discenza, Sr. Programmer/Analyst
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Carleton Inc. http://www.carletoninc.com
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