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From: ken qaws on 19 Feb 2010 18:41
On Feb 19, 1:39 pm, nos...(a)see.signature (Richard Maine) wrote:
> e p chandler <e...(a)juno.com> wrote:
>
> > Maybe. A formatted file is a file of text records. LF is being
> > translated to CR/LF on output in this case even though you specify '$'
> > which is a non-standard edit descriptor for suppress end-of-line.
>
> That would be normal. Of course, as noted, the $ edit descriptor is
> non-standard, so pretty much nothing can be guaranteed, but the "normal"
> expectation would be that it just act like advance='no', which
> suppresses the otherwise automatic end-of-record that you get at the end
> of the write. It does not suppress record ends generated for any other
> reason, including / edit descriptors, format reversion, or writing
> newline characters to the file as data.
>
> The OP is trying to write what is inherently unformatted data. Using
> formatted I/O for that is full of problems, this being only one of them.
>
> > Before trying to answer your question directly, let me suggest that
> > you upgrade to g95 or gfortran. They both support "stream" I/O - a
> > Fortran 2003 construct - which allows reading and writing single raw
> > bytes. (access='stream'). Other compilers have other non-standard ways
> > of accomplishing this as well.
>
> Yes. I strongly recommend that as the preferred general direction -
> either the f2003 standard stream I/O or one of the earlier
> compiler-specific variants.
>
> > If you are restricted to G77, you could try a direct access file with
> > a record length of 1 byte. I think it's formatted but I don't use this
> > feature.
>
> Direct access is either formatted or unformatted, whichever you specify,
> just like sequential. Unformatted is what you want.
>
> --
> Richard Maine                    | Good judgment comes from experience;
> email: last name at domain . net | experience comes from bad judgment.
> domain: summertriangle           |  -- Mark Twain

Thanks for all the great advice, guys! I installed g95, and I'm
writing the bitmap file using form='unformatted', access='stream'. It
works perfectly.
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