On Oct 28, 2008, at 17:32 , Greg Snow wrote:
Thanks, I had assumed that writeChar("",con) would write 0 bytes to
the file and had seen the other construct somewhere else. A quick
test of writeChar("",con) does have the ^@ (when viewed in emacs) in
the correct place, and there were no warnings, so I will change to
that.
Note that writeChar writes the string *and* EOS. writeChar("", con)
writes nothing for the string so what you get is just the EOS which is
one 0x00 byte. That gives you your \000. You previous construct was
simply a noop because your output string was always irrelevant (just
try nchar(rawToChar(as.raw(0))).
Cheers,
S
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
[EMAIL PROTECTED]
801.408.8111
-----Original Message-----
From: Simon Urbanek [mailto:[EMAIL PROTECTED]
Sent: Tuesday, October 28, 2008 3:20 PM
To: Greg Snow
Cc: R-devel@r-project.org
Subject: Re: [Rd] writting null (\000 or ^@) to an external text file
without the new warning
On Oct 28, 2008, at 14:23 , Greg Snow wrote:
I have some functions that write an external text file for
postprocessing by another program. Some instructions to the other
program need to be indicated by null values (\000 or ^@). The
function currently uses code like:
writeChar(rawToChar(as.raw(0)), con)
where con is a connection to the file. Previous to version 2.8.0
this worked fine. With 2.8.0 it still works, but I get a warning
message about "truncating string with embedded null: '\0'" every
time. This is documented and not a bug, but I still find it
annoying.
Well, why don't you just use
writeChar("", con)
that's what you're actually calling anyway since rawToChar(as.raw(0))
is exactly "" as it gets truncated.
Cheers,
S
One thing I could do is to turn off all warnings before doing this,
but then if there is some other warning generated, then I will miss
the other warning(s).
Is there a better way to write the null to the text file? Or is
there a way to suppress just this warning without suppressing any
other warnings that may occur?
Thanks,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
[EMAIL PROTECTED]
801.408.8111
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