From John.Peters@tip.csiro.au  Fri Jul 23 09:51:48 1999
From: John.Peters@tip.csiro.au (John Peters)
Date: Fri, 23 Jul 1999 18:51:48 +1000 (EST)
Subject: reluctant to read win95 directory (PR#231)
In-Reply-To: <Pine.GSO.4.05.9907220736550.3797-100000@auk.stats> from Prof Brian D Ripley at "Jul 22, 99 07:43:02 am"
Message-ID: <199907230851.SAA05406@dylan.tip.CSIRO.AU>

Prof Brian D Ripley writes:

> Why was this a bug report?  It does not seem to me to meet the requirements
> of a bug given in the R FAQ.
> 
> On 22 Jul 1999, Peter Dalgaard BSA wrote:
> 
> > John.Peters@tip.csiro.au writes:
> > 
> > > Using rw0642 under win95, on executing from a directory on the c: drive:
> > > 
> > >    system("command.com /c dir", intern=T)
> > > 
> > > there is a whirring from drive a: (empty), then the message appears in a 
> > > dos box:
> > > 
> > >    General failure reading device aLP!!?
> > >    Abort, Retry, Fail?
> > 
> > Not that I know anything about Windows, but is there a chance that the
> > machine goes looking for command.com on the diskette? I.e. you want
> > c:\\windows\\command.com instead.
> 
> Not on my machine: that command works for me.
> 
> What do you (John) expect this command to do? In particular, what directory
> does you expect it to list?  You have not told it, and Windows has quite
> complicated rules for finding the current working directory. My guess
> is that those rules are giving a: in your circumstances. Put a floppy
> in and find out.
> 
> Tip:  using shell() would be much simpler. Try ?shell (on Windows only).


Firstly a workaround (fix?):

Disable McAfee VirusScan 4.0.2/4.0.4032.  If this means it could 
be described as more an incompatibility than a bug I apologise. 


Secondly to respond to the comments and suggestions (McAfee enabled):

What do I expect this command to do:
To read the names of the files in the current directory for assignment 
to a vector.  By current directory I mean the one named in the win95 
shortcut "Start in:" box, which is also the one initially offered by the 
Rgui pull down "File - Change dir".  It succeeds in this, but not on the 
first attempt.

Put a floppy in drive a:
Less whirring, but same result.  Hitting "a" gives the behaviour I 
described.  Hitting "f" succeeds after a few tries, but next time again 
needs a few tries before succeeding.  So far it seems exactly four "f"s 
or three "a"s are required.

Try shell():
Both the following cause the same behaviour as with "system()":
  shell("dir c:\\tmp\\9907","c:\\windows\\command.com",intern=T)
  shell("dir","command.com",intern=T)

Many thanks

----------------------------------------------------------------------------
John Peters
CSIRO National Measurement Laboratory
PO Box 218                                Phone:    +61 2 9413 7503
Lindfield NSW 2070                        Fax:      +61 2 9413 7202
Australia                                 Internet: John.Peters@tip.CSIRO.AU
----------------------------------------------------------------------------
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-devel-request@stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._


reluctant to read win95 directory (PR#231)
John Peters