REXX Tips & Tricks, Version 2.80


Inf-HTML [About][Toc][Index] 0.9b (c) 1995 Peter Childs


Get the object ID for an object handle



 
/*                                                                    */
/*                                                                    */
/* Get the object ID for an object handle                             */
/*                                                                    */
/* Note:                                                              */
/*                                                                    */
/* The environment variable WP_OBJHANDLE contains the object handle   */
/* for an OS/2 session. Note also that all sessions started from      */
/* an OS/2 session with the START command will inherit the object     */
/* handle from that session.                                          */
/*                                                                    */
/* Author: Wolfram Sperber (see EMail Addresses)                      */
/*                                                                    */
/* He has developed this method in his program iNFOMAN 2.1, where any */
/* number of WPS-objects are all starting the same program, through a */
/* number of different jobs:                                          */
/*                                                                    */
/* By identifying the Id of the actual starting object, specific job  */
/* data can be selected, stored otherwhere, but dedicated to the      */
/* actual object's run.                                               */
/*                                                                    */
/* In general:                                                        */
/*                                                                    */
/* If the unique object-Id is known, it can be used, f.e., as a link  */
/* to a unique set of parameters or data, not stored with the object  */
/* (thus not in OS2.INI).                                             */
/*                                                                    */
/* Advantages:                                                        */
/* - If a WPS-object is lost or corrupt, the object-specific data     */
/*   survive.                                                         */
/* - This kind of association of a programm with its data would also  */
/*   be more stable than using program parameters for data, or the    */
/*   object-title as a link to them.                                  */
/*                                                                    */
/* iNFOMAN 2.1 is available at BMTMirco (http://www.bmtmicro.com),    */
/* The name of the archive is IMAN21L.ZIP.                            */
/*                                                                    */

                    /* load the REXXUTIL functions                    */
  call rxFuncAdd "SysLoadFuncs", "REXXUTIL", "SysLoadFuncs"
  call SysLoadFuncs

                    /* get the parameter                              */
  parse arg objHandle

                    /* default is the handle of this OS/2 session     */
  if objhandle = '' then
    objHandle = strip( value( 'WP_OBJHANDLE' , , 'OS2ENVIRONMENT' ) )

  say 'Detecting the object id of the object with the handle "' || ,
       objHandle || '" ...'

  curID = GetObjectID( objHandle )
  if curID = '' then
    say 'Error: Cannot detect the object ID!'
  else
    say 'The object ID is "' || curID || '".'

exit (curID = '')

/* ------------------------------------------------------------------ */
/* function: Get the object ID for an object handle                   */
/*                                                                    */
/* call:     objectID = GetObjectID( objectHandle )                   */
/*                                                                    */
/* where:    objectHandle - object handle                             */
/*                                                                    */
/* returns:  either the object ID or "" if the object doesn't have    */
/*           an object ID                                             */
/*                                                                    */
/* Author:   Wolfram Sperber (see EMail Addresses)                    */
/*                                                                    */
/*                                                                    */
GetObjectID: PROCEDURE
  parse upper arg objectHandle

  thisRC =""

  if objectHandle <> "" & ,
     verify( objectHandle, '0123456789ABCDEF', 'NOMATCH' ) = 0 then
  do

                    /* convert handle to HEX                          */
    HexVal = strip( d2x( objectHandle ) )

                    /* If the handle is in the format "value@20"      */
                    /* we must remove the prefix                      */
    if substr( HexVal,2,1 ) = '0' then
      HexVal = right( HexVal,3 )
    else
      HexVal = right( HexVal,4 )

                    /* remove a trailing zero                         */
    if left(HexVal,1) = '0' then
      HexVal = substr(HexVal,2)

                    /* Now we should have the Keyname for this object */
                    /* in the file OS2.INI                            */
    KeyValue  = Sysini( "USER", "PM_Abstract:Objects", HexVal )

    select

      when KeyValue = 'ERROR:' then
      do
                    /* key not found in OS2.INI                       */
      end /* when */

      when lastpos( '<',KeyValue ) = 0 | lastpos( '>',KeyValue ) = 0 then
      do
                    /* object has no object ID                        */
      end /* when */

      otherwise
      do
        id = substr(KeyValue,lastpos('<',KeyValue) , ,
             (pos('>',KeyValue, lastpos('<',KeyValue) +1))-(lastpos('<',KeyValue))+1)

        if id <> '' then
          thisRC = id

      end /* otherwise */
    end /* select */
  end /* if */

return thisRC

  

Inf-HTML End Run - Successful