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From: jemptymethod on 23 Jul 2010 06:55
Somebody suggested the following code to me for debugging an http
request:

package require http
set tok [http::geturl http://localhost:1565/pgn4desk.htm]
upvar $tok token
set token(body) ""
parray token

However it results in the following error. I still haven't wrapped my
head around upvar :( Hopefully in the near future as I use Tcl more
and more. Thanks in advance for any guidance:

$ ./tclkit-cli pgn4desk.vfs/debug.tcl
bad level "::http::1"
while executing
"upvar $tok token"
(file "pgn4desk.vfs/debug.tcl" line 3)
From: Uwe Klein on 23 Jul 2010 07:09
jemptymethod wrote:
> Somebody suggested the following code to me for debugging an http
> request:
>
> package require http
> set tok [http::geturl http://localhost:1565/pgn4desk.htm]
> upvar $tok token
> set token(body) ""
> parray token
>
> However it results in the following error. I still haven't wrapped my
> head around upvar :( Hopefully in the near future as I use Tcl more
> and more. Thanks in advance for any guidance:
>
> $ ./tclkit-cli pgn4desk.vfs/debug.tcl
> bad level "::http::1"
> while executing
> "upvar $tok token"
> (file "pgn4desk.vfs/debug.tcl" line 3)

package require http
set tok [http::geturl http://localhost:1565/pgn4desk.htm]
# there is no level further up than (the current) toplevel scope thus
# upvar wants that optional level argument:
upvar #0 $tok token

set token(body) ""
parray token

#or
package require http
set tok [http::geturl http://localhost:1565/pgn4desk.htm]
set ${tok}(body) ""
parray $tok

uwe
From: Alexandre Ferrieux on 23 Jul 2010 08:11
On Jul 23, 1:09 pm, Uwe Klein <uwe_klein_habertw...(a)t-online.de>
wrote:
> jemptymethod wrote:
> > Somebody suggested the following code to me for debugging an http
> > request:
>
> > package require http
> > set tok [http::geturlhttp://localhost:1565/pgn4desk.htm]
> > upvar $tok token
> > set token(body) ""
> > parray token
>
> > However it results in the following error.  I still haven't wrapped my
> > head around upvar :(  Hopefully in the near future as I use Tcl more
> > and more.  Thanks in advance for any guidance:
>
> > $ ./tclkit-cli pgn4desk.vfs/debug.tcl
> > bad level "::http::1"
> >     while executing
> > "upvar $tok token"
> >     (file "pgn4desk.vfs/debug.tcl" line 3)
>
> package require http
> set tok [http::geturlhttp://localhost:1565/pgn4desk.htm]
> # there is no level further up  than (the current) toplevel scope thus
> # upvar wants that optional level argument:
> upvar #0 $tok token
>
> set token(body) ""
> parray token
>
> #or
> package require http
> set tok [http::geturlhttp://localhost:1565/pgn4desk.htm]
> set ${tok}(body) ""
> parray $tok
>
> uwe

Note that the confusing error message

bad level "::http::1"

is now (8.6) replaced by the accurate

bad level "1"

since the root cause of the problem is the fact that, without an
explicit level, upvar assumes [upvar 1] (meaning one up), which here
is invalid as you said, since we're already at toplevel.

This message improvement was part of the fix for bug 2673163:

https://sourceforge.net/tracker/index.php?func=detail&aid=2673163&group_id=10894&atid=110894

-Alex
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