[R] Problem with pdf, png, jpeg devices and files named CON on Window s
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Jan 15 15:13:28 CET 2007
This is a restriction of the ISO C interface to the Windows API. E.g.
## Furthermore, Uwe Ligges says that Windows still does not allow
## the following DOS device names (by themselves or with possible
## Name Function
## ---- --------
## CON Keyboard and display
## PRN System list device, usually a parallel port
## AUX Auxiliary device, usually a serial port
## CLOCK$ System real-time clock
## NUL Bit-bucket device
## COM1 First serial communications port
## COM2 Second serial communications port
## COM3 Third serial communications port
## COM4 Fourth serial communications port
## LPT1 First parallel printer port
## LPT2 Second parallel printer port
## LPT3 Third parallel printer port
Windows Explorer seems to have a different set of rules, disallowing a lot
of valid names (e.g. .Rprofile) but allowing some invalid ones.
On Mon, 15 Jan 2007, Brandt, T. (Tobias) wrote:
> I cannot seem to create any files that have the name "CON" before the file
> extension, i.e. all of the following fail:
> Error in pdf("CON.pdf") : unable to start device pdf
> Error in jpeg("CON.jpeg") : unable to start device devWindows
> Error in png("CON.png") : unable to start device devWindows
> Error in file(file, ifelse(append, "a", "w")) :
> unable to open connection
> Any filename other than this works fine.
> null device
> null device
> Remembering that in the old DOS days, commands like 'copy CON myfile.bat'
> were common, I suspected that this has something to do with CON being a
> reserved word so I tried to create the files manually in Windows explorer.
> Creating files named 'CON.png', 'CON.pdf', 'CON.txt' all work fine. However
> I did notice that Windows won't let me create a file named just "CON".
> However since the devices that I'm trying to create have extensions, I don't
> understand why they fail.
> Who can help?
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> major 2
> minor 3.1
> year 2006
> month 06
> day 01
> svn rev 38247
> language R
> version.string Version 2.3.1 (2006-06-01)
> sysname release
> version nodename
> "Windows" "NT 5.1" "(build 2600)
> Service Pack 2"
> machine login
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Brian D. Ripley, ripley at 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
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