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TCL(Tool Command Language) Scripting
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tcl list name
Hello,
If I have access to the name of a tcl list, how
can I access the elements?
I'm reading in a file that has the names of list variables.
set lvar { 1 2 3} <--- don't have access to this
set lname "lvar" <--- I have access to this only
How do I display the values of lvar using lname?
THANKS!
Hello,
If I have access to the name of a tcl list, how
can I access the elements?
I'm reading in a file that has the names of list variables.
set lvar { 1 2 3} <--- don't have access to this
set lname "lvar" <--- I have access to this only
How do I display the values of lvar using lname?
THANKS!
ap wrote: > Hello, > If I have access to the name of a tcl list, how > can I access the elements? > I'm reading in a file that has the names of list variables.
> set lvar { 1 2 3} <--- don't have access to this
> set lname "lvar" <--- I have access to this only
> How do I display the values of lvar using lname?
> THANKS!
set lname "lvar"
# this:
set thislist [ set $lname ]
# alternatively:
upvar 0 $lname l_lvar
set thislist $l_lvar
uwe
On May 15, 12:18 pm, ap <cors@ragingbull.com> wrote:
> Hello, > If I have access to the name of a tcl list, how > can I access the elements? > I'm reading in a file that has the names of list variables.
> set lvar { 1 2 3} <--- don't have access to this
> set lname "lvar" <--- I have access to this only
> How do I display the values of lvar using lname?
> THANKS!
set lname $lvar
$lname will have the same elements in its list as $lvar does.
if you:
puts $lvar
that will show you what is in $lvar:
(bin) 17 % set lvar {1 2 3}
1 2 3
(bin) 18 % set lname $lvar
1 2 3
(bin) 19 % puts $lvar
1 2 3
(bin) 20 % puts $lname
1 2 3
(bin) 21 % puts [llength $lvar]
3
(bin) 22 % puts [llength $lname]
3
(bin) 23 %
Not sure what you are trying to do though...but I hope that helps.
Robert
On May 15, 12:43 pm, Robert Hicks <sigz@gmail.com> wrote:
> Not sure what you are trying to do though...but I hope that helps.
I suspect this is a need for redirection.
% set var1 [list a b c]
a b c
% set ptr [list var1]
var1
% puts $ptr
var1
% puts [set $ptr]
a b c
% llength [set $ptr]
3
Hello,
in tcl it is not that usual to say that a list has a name.
But a list (data structure) is hold by a variable, which itself has a
name.
% set lvar [list 1 2 3]; # creating a list stored in the variable
lvar
1 2 3
% set lvar; # accessing the variable lvar directly
1 2 3
% set foo [set lvar]; # using the contents of the variable lvar
1 2 3
% set foo $lvar; # direct "dereferencing" of the variable lvar
1 2 3
% lindex $lvar 0; # accessing the first element of the list inside
the lvar
1
% set varName "lvar"
lvar
% set $varName; # accessing the variable lvar via the stored
variable name
1 2 3
It happens not very often, that the name of a variable must be built
dynamically, so that it is necessary to store the name of a variable
in another variable to have "indirect" access to those values.
If I say "not very often", than I don't mean, that there is no need
for, but mostly in my applications there was no need and sometimes I
was glad to be able to access variables "indirectly".
Best regards,
Martin Lemburg
Siemens Automation and Drives - UGS PLM Software
On May 15, 6:18 pm, ap <cors@ragingbull.com> wrote:
> Hello, > If I have access to the name of a tcl list, how > can I access the elements? > I'm reading in a file that has the names of list variables.
> set lvar { 1 2 3} <--- don't have access to this
> set lname "lvar" <--- I have access to this only
> How do I display the values of lvar using lname?
> THANKS!
In article <1179248000.914811.133@e65g2000hsc.googlegroups.com>,
MartinLemburg@UGS <martin.lemburg. @gmx.net> wrote:
.
.
>It happens not very often, that the name of a variable must be built >dynamically, so that it is necessary to store the name of a variable >in another variable to have "indirect" access to those values. >If I say "not very often", than I don't mean, that there is no need
>for, but mostly in my applications there was no need and sometimes I
>was glad to be able to access variables "indirectly".
.
.
... and, as Martin knows, often when it does seem as though
a "double dereferencing" is appropriate, a recoding in terms
of an associative array (or dictionary) is even more so <URL:
http://wiki.tcl.tk/8662 >.
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