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From: YoCmos on 16 Jul 2010 08:40
I have a program that writes to stderr and I want to execute it with
"exec".
When I do this, TCL shows me an error message as though it was an
ordinary TCL error.
I simply want the output of this program to go to a variable. this is
what I did:
set compiler "bin/tecs-software-suite-2.5/JackCompiler.bat"
set s [exec $compiler $current_file 2>@1]
the 2>@1 doesn't help, it's still showing me a TCL error. I tried -
ignorestderr but it also didn't work.
I work with tcl 5.8.5 on Win7
please help.
From: Alexandre Ferrieux on 16 Jul 2010 08:48
On Jul 16, 2:40 pm, YoCmos <yrei...(a)gmail.com> wrote:
> I have a program that writes to stderr and I want to execute it with
> "exec".
> When I do this, TCL shows me an error message as though it was an
> ordinary TCL error.

Any reason not to paste the error message here ? You playing a
guessing game ?

> I simply want the output of this program to go to a variable. this is
> what I did:
> set compiler "bin/tecs-software-suite-2.5/JackCompiler.bat"
> set s [exec $compiler $current_file 2>@1]
> the 2>@1 doesn't help, it's still showing me a TCL error. I tried -
> ignorestderr but it also didn't work.
> I work with tcl 5.8.5 on Win7
> please help.

I don't know for Windows, but in unix the other reason for an error in
exec (beside the non-redirected stderr) , is a nonzero exit status.

The usual workaround, when you are using a frozen child with a non-
fixable error status, is to wrap it in a shell invocation finished by
"; exit 0":

exec sh -c "some rogue-exit command; exit 0" 2>@1

Maybe a similar form exists for .BATs, but I don't know the syntax.

-Alex

From: Robert Heller on 16 Jul 2010 09:44
At Fri, 16 Jul 2010 05:48:46 -0700 (PDT) Alexandre Ferrieux <alexandre.ferrieux(a)gmail.com> wrote:

>
> On Jul 16, 2:40=A0pm, YoCmos <yrei...(a)gmail.com> wrote:
> > I have a program that writes to stderr and I want to execute it with
> > "exec".
> > When I do this, TCL shows me an error message as though it was an
> > ordinary TCL error.
>
> Any reason not to paste the error message here ? You playing a
> guessing game ?
>
> > I simply want the output of this program to go to a variable. this is
> > what I did:
> > set compiler "bin/tecs-software-suite-2.5/JackCompiler.bat"
> > set s [exec $compiler $current_file 2>@1]
> > the 2>@1 doesn't help, it's still showing me a TCL error. I tried -
> > ignorestderr but it also didn't work.
> > I work with tcl 5.8.5 on Win7
> > please help.
>
> I don't know for Windows, but in unix the other reason for an error in
> exec (beside the non-redirected stderr) , is a nonzero exit status.
>
> The usual workaround, when you are using a frozen child with a non-
> fixable error status, is to wrap it in a shell invocation finished by
> "; exit 0":
>
> exec sh -c "some rogue-exit command; exit 0" 2>@1
>
> Maybe a similar form exists for .BATs, but I don't know the syntax.
>
> -Alex

The other solution is to use catch (this will work on any O/S):

catch {exec some rogue-exit comand} result



>
>

--
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From: YoCmos on 16 Jul 2010 10:04
I probably didn't explain myself correctly. Here is it:
The stderr of the program I execute is displayed like it was an
ordinary error(a TK error message box).
The only thing I want it to do is to put the sterr in a variable and
not to show this error message box.
I'l try the "catch" command.
thanks.
From: YoCmos on 16 Jul 2010 10:12
Worked!!
I tried to put catch but it didn't help.
Then I added an "exit 0" line in the end of the .bat file and that's
it -
no more error boxes!
Thanks everybody, I wonder if there is a more good looking solution
for this...
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