Message-ID: <Pine.LNX.4.44.0309012214180.23108-100000@gannet.stats>
Date: 2003-09-01T23:14:35Z
From: Brian Ripley
Subject: File Reading Problem (PR#4043)
In-Reply-To: <ggc7lvc0i2od34kdhkc6p0lct3mpu19h78@4ax.com>
On Mon, 1 Sep 2003, Duncan Murdoch wrote:
> On Mon, 1 Sep 2003 22:32:29 +0200 (MET DST), you wrote:
>
> >On Mon, 1 Sep 2003 14:26:43 -0700, "Jiming Yu"
> ><jimingyu@princeton.edu> wrote:
> >
> >>Dear all,
> >> I am trying to read characters byte by byte(in their ASCII codes) from a
> >>file
> >
> >I was going to suggest using readBin, but there seems to be a bug:
> >
> >> con <- file('c:/test.txt','rb')
> >> readBin(con,'c',15,1)
>
> The problem was that the R code assumed 'c' was a storage mode, and
> the C code assumed that it had already been checked as valid. I'll
> put a patch into r-devel.
>
> The answer to the original question is to use readChar, not readBin.
> readBin looks for C-style null terminated strings. readChar can read
> characters one at a time.
It's on the help page for readBin, though.
>
> The right code to read "This is a book." from file foo.txt is
>
> readChar("foo.txt", rep(1, 15))
>
> Duncan Murdoch
>
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> https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
>
>
--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595