On Wed, Jun 3, 2015 at 2:41 PM, <MichaelQuigley@xxxxxxxxxx> wrote:
The PC process which later uses the data doesn't interpret these as blank
fields.

Generally speaking, I find processing stream files on the PC much
easier than processing them on the i, so if I control both ends, I do
the "simplest possible thing" on the i, and delegate the rest to the
PC. But that's neither here nor there.

I call the write API using my revised data. Then I have to use
the ftruncate() API to shorten the file to its new length.

Well, the point of ftruncate() is to set the new size, so could it be
that you've specified a size that is one byte too small?

John Y.

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