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Reply To: Passing multiple args to a tcl proc in one variable

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September 16, 2009 at 3:31 pm #57029
Troy Morton
Participant

    I personally prefer keyed lists.  This allows you to add or remove arguments to the proc without affecting the fucntionality or compatibility if the proc is being used in multiple places .. like so ..

    Code:


             #
             # Populate the arguments to send to the proc SendEmailMessage
             # and call the proc.
             #
             keylset mailargs MH         $mh
             keylset mailargs TOFILE     $blnTrcWrite
             keylset mailargs HOSP       $msghosp
             keylset mailargs MAILTO     $mailto
             keylset mailargs MAILFROM   $mailfrom
             keylset mailargs MAILSUBJ   $mailsubj
             keylset mailargs MAILMSG    $mailmsg
             keylset mailargs MAILSERVER $mailserver
             keylset mailargs MAILDOMAIN $maildomain
             keylset mailargs MAILSTART  $mailstart
             keylset mailargs MAILSTOP   $mailstop

             SendEmailMessage $mailargs

    … and in the called proc get the data out of the argument keyed list …

    Code:


    proc SendEmailMessage { mailargs } {

       keylget mailargs         MH mh
       keylget mailargs     TOFILE blnTrcWrite
       keylget mailargs       HOSP hosp
       keylget mailargs     MAILTO mailto
       keylget mailargs   MAILFROM mailfrom
       keylget mailargs   MAILSUBJ mailsubj
       keylget mailargs    MAILMSG mailmsg
       keylget mailargs MAILSERVER mailserver
       keylget mailargs MAILDOMAIN maildomain
       keylget mailargs  MAILSTART mailstart
       keylget mailargs   MAILSTOP mailstop

    As I mentioned this gives you alot of flexibility to add or remove arguments and functionality to a proc while keeping it backwards compatible with other places its being used.

    Also, it doesn’t matter what order you supply the arguments because the list is keyed.  So, you don’t have to remember that the first argument is X and the second is Y the third is Z and take a chance of putting them in the wrong order when calling the proc.

    Hope this helps