From m204wiki
Jump to: navigation, search

Open procedure for $ProcDat, $ProcGet, $ProcLoc

Note: Many $functions have been deprecated in favor of Object Oriented methods. There is no OO equivalent for the $ProcOpn function.

The $ProcOpn function is used to "open" a procedure as input to a SOUL procedure via AppendOpenProcedure (or the deprecated $ProcGet and $ProcDat) or via $ProcLoc.

$ProcOpn accepts three arguments and returns a numeric code. It is also a callable $function.


%result = $ProcOpn(proc_name, [file_name], inc_string)

Syntax terms

%result A numeric return code that indicates the success of the function. (Return codes are listed below.)
proc_name This argument is required; it identifies the SOUL procedure to be opened.
file_name An optional file name. If this argument is not provided or is a null string, the current file is used.
inc_string A string that is used by $ProcGet for dummy string substitution, just as if this argument had been placed on an Include statement.

Note: $ProcDat does no dummy string substitution.

Return codes

-1 - Current include level not opened by $ProcOpn 0 - Procedure opened without errors 1 - Procedure is locked for edit or delete 2 - Procedure does not exist or the current user does not have access privilege 3 - Specified procedure name is invalid (null) 4 - File name invalid, or no current file, or caller does not have sufficient privilege to display/include procedures 5 - The maximum number of open procedures (5) has already been reached 6 - Insufficient space in ITBL to hold third argument; increase the size of ITBL

Usage notes

  • After $ProcOpn has successfully opened a procedure, $ProcGet and $ProcDat may be used to retrieve the procedure source lines, and $ProcLoc may be used to scan the lines.
  • If a "temporary request" (a negative number or zero) is specified for proc_name that does not exist (this includes numbers outside the range of the NORQS parameter), an error condition may result. For example:


    When the above fragment is executed, the following error occurs (but the request continues to run):

    M204.1186: Bad previous request number

    The value 0 is returned by $ProcOpn, and the procedure is treated as an empty procedure. This probably works properly for most applications.

    Beware: If your application passes such non-existing temporary request numbers to $ProcOpn, your request may be subject to request cancellation due to exceeding ERMX.


Suppose procedure TIS_PITY in procedure file HOHO contains this line:


Then this sequence:

%result = $ProcOpn('TIS_PITY', 'HOHO', ' THESE ARE ARGUMENTS') %line = $ProcGet

Results in %line being set to:


Products authorizing $ProcOpn