RE: system()

thanks simon, i am getting proper message IDs in _EXCP_MSGID.


> ----------
> From:         Simon Coulter[SMTP:shc@flybynight.com.au]
> Reply To:     c400-l@midrange.com
> Sent:         Tuesday, June 04, 2002 7:31 AM
> To:   c400-l@midrange.com
> Subject:      RE: [C400-L] system()
>
>
> Hello Phil,
>
> You wrote:
> >> sprintf(buffer,_format_an_invalid_CL_command);
> >> rc = system(buffer);
> >> if(rc != 0)
> >> {
> >>   printf("Error is %s\n",_EXCP_MSGID);
> >>   exit(-1);
> >> }
> >
> >system() doesn't work like that.
>
> Actually, system() does work like that.
>
> >system() runs a 'self contained' task, the control boundary for it means
> >that the any CPF msgs generated by it are 'out of scope' when system()
> >returns control to you. If you want to be able to retrieve the CPF msgs,
> >use QCAPCMD API instead of the system() runtime function.
>
> That's true as far as it goes, however system() does set the _EXCP_MSGID
> variable to point to a string containing the message ID of the error
> message.  While this is not as useful as retrieving the message
> description
> it does allow error handlig to branch according to the received error.
>
> I modified Srikanth's example to create a working program.
>
> #include<stdio.h>
> #include<stdlib.h>
> #include<stddef.h>
>
> main()
> {
> int rc;
> char buffer[100];
>
> sprintf(buffer, "_format_an_invalid_CL_command");
> rc = system(buffer);
> if(rc != 0)
> {
>   printf("Error is %s\n",_EXCP_MSGID);
>   exit(-1);
> }
>
> return 0;
> }
>
> Running it on my 440 system results in the expected behaviour.  For
> example:
>
> Error is CPF0006
> Press ENTER to end terminal session.
>
> Regards,
> Simon Coulter.
> --------------------------------------------------------------------
>    FlyByNight Software         AS/400 Technical Specialists
>    http://www.flybynight.com.au/
>
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