From: Alexander Wagner <a.wag...@physik.uni-wuerzburg.de>
>
> On 11/15/10 00:11, Joost 't Hart wrote:
>
> Hi!
>
> >> 3. Capture the output from stderr also. Stockfish writes to stderr on
> >> an error exit, but the message vanishes because there is no console
> >> window.
> >
> > Hm, I like what you say but this could mean quite some work, as Scid is
> > used to parse the stuff coming from the engine. So we would need to add
> > the notion that something that cannot be understood should be sent in
> > raw format to the engine window?
>
> I'd be pretty careful here and crosscheck what UCI definition says about
> stderr. AFAIK it is not used and therefore one can't expect anything
> decent on that channel. In other words: we would not want to handle very
> other engine separately cause the programmer doesn't follow the
> standards. More likely than parsing this and that unstructured output
> I'd raise a bug report @ stockfish. ;)
>
My thought was more that if an engine exits unexpectedly, scid would
get the return code and any messages in stderr and display them in a
dialog box. The uci spec says nothing about errors (except copy
protection errors), so there is no standard way to return errors,
though putting a message to stderr is common. Here is some code from
http://stackoverflow.com/questions/1621166/tk-tcl-exec-stderr-stdout-separately
that appears to do what is needed. I am not a good enough tcl
programmer to say if it could be easily adapted.
set data {here is some data}
set command {sh -c {
echo "to stdout"
read line
echo "$line"
echo >&2 "to stderr"
exit 42
}}
set pipe [open "| $command" w+]
puts $pipe $data
flush $pipe
set standard_output [read -nonewline $pipe]
set exit_status 0
if {[catch {close $pipe} standard_error] != 0} {
global errorCode
if {"CHILDSTATUS" == [lindex $errorCode 0]} {
set exit_status [lindex $errorCode 2]
}
}
puts "exit status is $exit_status"
puts "captured standard output: {$standard_output}"
puts "captured standard error: {$standard_error}"
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