From help-octave-request at bevo dot che dot wisc dot edu  Wed Jan 31 06:46:42 2001
Subject: Lifetime of variables and .oct files
From: Pascal Fleury <p dot fleury at ieee dot org>
To: help-octave at bevo dot che dot wisc dot edu
Date: Wed, 31 Jan 2001 21:43:31 +0900

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Hi there !

I have an .oct file in which I open a file, and get the file descriptor
for it. This has to be given to subsequent accesses to the function in
the .oct file. So I can open a file, and make multiple accesses from
octave scripts to get chunks of the data in the file. Example:

infile = opensndfile("mysound.aiff")     # opens a file, creates some
structure in memory within the .oct file
chunk1 = readsndblock(infile, 1024) # reads 1024 samples
chunk2 = readsndblock(infile, 1024) # read the following 1024 samples
infile = 2 # Here: the file should be closed, and the memory released in
the .oct file

But I do not know when I can close the file and remove the info in
memory, as this should be done ideally when the variable goes
out-of-scope or stops living within Octave (e.g. infile gets assigned a
new value). Is there a way of knowing this in the .oct file ? Am I
guaranteed that the .oct file will not be unloaded before this happens ?
Or is my complete design wrong ?

Thanks for any help,
Pascal

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