Re: Accessing variable defined in one proc, in another proc
- From: Arjen Markus <arjen.markus@xxxxxxxxxx>
- Date: Mon, 11 Jun 2007 00:59:59 -0700
On 11 jun, 09:35, rick <vagabond_maver...@xxxxxxxxx> wrote:
I am defining a variable inside a proc. And I want to use this
variable in another proc.
One way is to return that variable form that proc to the main script
and then access it in another proc by using global command. But is
there any way , I can access it in another proc directly.
eg :
proc1 {
set a xxx
}
proc2 {
puts $a
}
main script :
proc1
proc2
In the above example I want a defined in proc 1 to be accessible in
proc 2.
Variables defined and used in a procedure exist only while that
procedure is being run. When the procedure returns all variables
within that procedure are gone.
What you really want is a global variable:
proc proc1 {
global a
set a 1
}
proc proc2 {
global a
puts $a
}
# Main code
proc1
proc2
You can look at the "variable" command too that defines
variables in other namespaces than the global namespace.
What you can also do is use the upvar command, if proc1
uses proc2:
proc proc1 {
set a 1
proc2
puts "After proc2: $a"
}
proc proc2
upvar 1 a use_a
puts "From proc1: $use_a"
set use_a 2
}
That works because the variable "a" as defined in proc1 still
exists when proc2 is running - proc1 is also still there
(albeit nothing happens until proc2 returns).
Regards,
Arjen
.
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