On 25 Apr 2012 09:04, Stone, Joel wrote:
Is it safe to CALL QLICKOBJ as described in the CHKOBJ command info

Note that the "State used to call program" is *SYSTEM. Presumable even if you were granted authority, e.g. *PUBLIC having *USE, then the CALL should fail anyway, with MCH6801 "Object domain or storage protection error" because your user program does not run in System State. That is, DSPPGM YourPgm would show in "Program Statistics" that the program has "Program state: *USER" and "Program domain: *USER", but DSPPGM QSYS/QLICKOBJ would show both of those same attributes as *SYSTEM.

Or could IBM change the pgm name or parms called by CHKOBJ command
in future releases?

Any program not documented as an API could change to no longer be available to the user domain or change parameters; definition and\or number, in any release or even a PTF.

If I try "CALL QLICKOBJ", I find that I don't have authority to call

And unless the system QSECURITY level is less than 40, the CALL will fail with the lic exception 4401.

How can I use CHKOBJ to call QLICKOBJ, but don't have authority to
call it directly? What allows me to run QLICKOBJ only when going
thru CHKOBJ command?

Because the *CMD processing is implemented by the OS. The Command Prompter (PT) or Command Analyzer (CA) component knows how to invoke the QLICKOBJ either via the System Entry Point Table (SEPT) by an address with the stored authority [or improbably more explicitly via its adopted authority from QSYS].

Is there a better method for checking if object exists?

Normally the attempt to use a missing object is the best way. If any proactive attempt is made, then concurrency means the presumed-failure style of proactive checking could make an improper decision; i.e. had the programming style been presumed-success and just attempted to use the object and found the object to have been created by then, the code could have continued without error or ever knowing the object may have been missing even just a microsecond before.

If one must insist on using the very less desirable pre-check, then like someone already stated in the previous thread, why not just use the Retrieve Object Description (QUSROBJD) API for which one possible outcome is "CPF9801 E Object &2 in library &3 not found." just like CHKOBJ and RTVOBJD:
"The Retrieve Object Description (QUSROBJD) API lets you retrieve object information about a specific object. This information is similar to the information returned using the Display Object Description (DSPOBJD) command or Retrieve Object Description (RTVOBJD) command. ..."

There are also options for invocations of the CL command CHKOBJ from a program; e.g. QCAPCMD, QCMDEXC, or invoking a CLP\CLLE which codes the "CHKOBJ &parm1/&parm2...", etc.


called with *SYSTEM state; allowed in all modes\environments

Regards, Chuck

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