[Tcl-bugs] [ tcl-Feature Requests-792990 ] Redirect file output into variables

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Feature Requests item #792990, was opened at 2003-08-22 09:47
Message generated for change (Comment added) made by elfring
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=360894&aid=792990&group_id=10894

Category: 36. File System
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Markus Elfring (elfring)
Assigned to: Vince Darley (vincentdarley)
Summary: Redirect file output into variables

Initial Comment:
The PHP programming language provides output control 
functions 
(http://de.php.net/manual/en/ref.outcontrol.php, e. 
g. "ob_get_contents"). I would like to use similar 
functionality with TCL.

1. http://tcl.tk/man/tcl8.4/TclCmd/open.htm
I suggest to add a parameter that specifies a variable 
name.
open $fileName $access $permissions $varName
   or
open -var $Name $fileName $access $permissions

2. http://tcl.tk/man/tcl8.4/TclCmd/fconfigure.htm
I suggest to add an interceptor and options to switch 
the output into variables on and off on the fly.
fconfigure -setvar $Name $channelId
fconfigure -stopvar $Name $channelId
fconfigure -getcontents Buffer $channelId

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>Comment By: Markus Elfring (elfring)
Date: 2003-08-22 15:36

Message:
Logged In: YES 
user_id=572001

1. Open  a new file with the option that all data is written to 
or read from a TCL variable
Example:
if {![catch {open -var Debug stdout w} File]} \
 {
  # Some code to check in a "special" execution environment

  # Do something...
   puts "Surprise"

  # Work is done.
  close $File

  LogResult $Debug
 }


2. Catch a part of file processing
Example:
fconfigure -setvar Debug stdout

# Do something...
puts "Surprise"

fconfigure -stopvar Debug stdout
LogResult $Debug

# Display message to the normal target
puts "finished"

if [file isbuffering stdout] \
 {
  fconfigure -getcontents Buffer stdout
  LogResult $Buffer
 }


Is this little explanation useful?

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Comment By: Vince Darley (vincentdarley)
Date: 2003-08-22 11:13

Message:
Logged In: YES 
user_id=32170

It's not clear from what you write what the behaviour is
that you are seeking for these 4 new commands.  How about
looking at the man pages and adding to this feature request
a few sentences on each option describing what it actually
does and how it is used, perhaps with an example?



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