Re: User defined commands with a "choice program"

["Steve McKay" <steve.mckay@xxxxxxxxxxxxxx>]

Vern & Doug -

Well, I would've sworn that I F10ed the CRTCMD command but I guess not -
because, lo and behold, there was the VCP prompt.  Threw my VCP together,
added it using CRTCMD, and Bob's yer uncle!  It worked like a charm.

Thanks for your assistance and instruction!

Steve

"Douglas Handy" <dhandy1@xxxxxxxxxxxxx> wrote in
message news:jm1a6vovuue5f9a3utrpi60r8f36vmo9u6@xxxxxxxxxx
> Steve,
>
> >So how do I "attach" the VCP to the command?  There doesn't appear to be
a
> >VCP option on either the command parms or the CRTCMD command.
>
> As Vern mentioned, prompt all keywords -- it is the VLDCKR() keyword which
names
> the VCP name.
>
> >Why couldn't my CPP function as a VCP?
>
> Because by that time you can't issue messages back to the bottom of the
command
> prompter, while the command is still prompted.
>
> >Currently, I'm validating the input
> >in my CPP and sending back error messages with SNDPGMMSG but when an
error
> >occurs, I can only send a message and cannot retain the command
on-screen.
>
> And that is precisely why you'd use a VCP instead.  As Vern mentioned, the
VCP
> sends back a *DIAG message(s) CPD0006 with error text to be displayed by
the
> prompter, followed by *ESCAPE message CPF0002 to throw the exception.
>
> VCP's are always called when a command is run, even if the command is not
> prompted.  A command may also optionally have a POP (for Prompt Override
> Program), but these *only* run when the command is prompted.  Thus a VCP
can
> validate input all the time, while a POP is only useful for prompting.
>
> VCP's can be used to validate input even when you don't use a Choice
Program.  \
>
> A choice program, VCP, POP, or CPP are all different animals with
different
> purposes.
>
> Hope this helps
>
> Doug
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