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Re: st: proceeding beyond roctab 2000 error msg - correction


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: proceeding beyond roctab 2000 error msg - correction
Date   Tue, 1 Jun 2004 19:17:55 -0400

You're right.  I have always assumed that the error code shown after an
error is put in _rc, but it isn't -- you learn something new every day.

This explains some previous wondering on my part when I find nonzero return
codes after executing ados that ran without an error. I now realize that
these were captured inside the ado -- a potentially confusing feature when
you see a nonzero _rc after running the ado because of a line like -cap
confirm string var xxx -.

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- 
From: "Gary Longton" <glongton@fhcrc.org>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, June 01, 2004 6:08 PM
Subject: Re: st: proceeding beyond roctab 2000 error msg - correction


> David Kantor wrote:
>
>  >>I might add that it is important to know that _rc is set only for a
>  >> command that occurs under -capture-.
>  >>
>  >>If you want to see the output of the command AND subsequently test _rc,
>  >>then do...
>  >>  capture noisily ...
>
> and Michael Blasnik replied:
>
> > I may be misunderstanding your first sentence, but _rc is set by every
> > command in Stata, whether you use -capture- or not.  It's just
> > that -capture- (quite appropriately named) captures the error code so
that
> > Stata does not stop processing the current do/ado file.
>
>
> I think that David was actually correct: _rc is a system scalar holding
the
> return code from the most recent -capture- command.  See [U]16.4 or
convince
> yourself by displaying (-display _rc-) after any erroneous Stata command
used
> without -capture-.
> Though a Stata command may return a variety of error codes, the code will
not be
> "captured" in the scalar _rc unless -capture- precedes that command.
>
> - Gary


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