Another test:
>D ^%ZIS
DEVICE: HOME// NULL NULL DEVICE NULL
>W $P
_TNA1044:
>W $IO
_TNA1044:
>ZW IO
IO=_NLA0:
IO(0)=_TNA1044:
IO(1,"_NLA0:")=
IO(1,"_TNA1044:")=
IO("CLOSE")=USER$:[WOODHOUSE]TEST.DAT;
IO("ERROR")=
IO("HOME")=530^_TNA1044:
IO("IP")=10.6.17.62
IO("ZIO")=10.6.17.62:1998
>U IO
>W $P
_TNA1044:
>W $IO
_TNA1044:
>
--- Greg Woodhouse <[EMAIL PROTECTED]> wrote:
> I just looked it up, and you are correct (not that I didn't believe
> you, of course). According to the standard, sec. 8.2.23:
>
> "The specified device remains current until such a time as a new USE
> command is executed. As a side effect of using expr to designate a
> current device, $IO is given the value of expr."
>
>
> --- Greg Woodhouse <[EMAIL PROTECTED]> wrote:
>
> > At a minimum, it's the behavior I observe under DSM:
> >
> >
> > >D ^%ZIS
> >
> > DEVICE: HOME// HFS HOST FILE SERVER FOR BRTM V 2.0
> > HOST FILE NAME:
> > USER$:[ANONYMOUS]//USER$:[WOODHOUSE]TEST.DATINPUT/OUTPUT OPERATI
> > ON: N
> >
> > >W "HELLO"
> > HELLO
> > >U IO
> >
> > >W "HELLO"
> > HELLO
> > >U IO W "HELLO"
> >
> > >D ^%ZISC
> >
> > >
> > --- Marianne Susaanti Follingstad <[EMAIL PROTECTED]> wrote:
> >
> > > I've used U IO(0) in several cases. One was when I was printing
> > > labels that needed to be
> > > alligned so I'd get the device for the printing and U IO(0) for
> > > promptings to the user
> > > regarding test labels and whether they were alligned yet. There
> > > could be many cases for
> > > prompting or informing a user while in the midst of a print
> > process.
> > >
> > > And as I noted earlier, U IO does not have to be on any
> particular
> > > line. It becomes
> > > effective when invoked and stays effective regardless of line,
> > > routine calls, etc, until
> > > another Use statement shifts things. I'm not sure where you got
> > the
> > > idea that it was
> > > otherwise, but as a programmer using M and FileMan for over 20
> > years
> > > I can assure you that
> > > there is no such limit or "feature."
> > >
> > > Marianne
> > >
> > > Greg Woodhouse wrote:
> > >
> > > > That's just the way the language works. I don't particularly
> like
> > > that
> > > > "feature", either. And no, you don't need to USE IO(0). Off the
> > top
> > > of
> > > > my head, I can't think of any reason an application programmer
> > > would
> > > > need to reference IO(0).
> > > >
> > > > Incidentally, when %ZIS was designed, the primary use for
> device
> > > output
> > > > was printing reports. If you ever need to use multiple devices,
> > you
> > > > should look at ^%ZISUTL. I find these calls useful, for
> example,
> > in
> > > > working with network devices.
> > > >
> > > > --- Kevin Toppenberg <[EMAIL PROTECTED]> wrote:
> > > >
> > > > > Greg,
> > > > >
> > > > > Thanks for your help.
> > > > >
> > > > > I don't understand why the use only works for the current
> > > line.... oh
> > > > > well.
> > > > > Do I need to put a U IO before every write in the REPORT
> > > function?
> > > > > If the system reverts to the home device on the next line, do
> I
> > > need
> > > > > to U IO(0)?
> > > > >
> > > > > Thanks
> > > > > Kevin
> > > > >
> > > > >
> > > > > Greg Woodhouse <[EMAIL PROTECTED]> wrote:
> > > > > Very close. First of all, when you are done, you should close
> > the
> > > > > device with
> > > > >
> > > > > D ^%ZISC
> > > > >
> > > > > The other point is that USE only affects the current line.
> > > > >
> > > > > U IO
> > > > > D REPORT
> > > > >
> > > > > won't work. What you need is
> > > > >
> > > > > U IO D REPORT
> > > > >
> > > > > --- Kevin Toppenberg wrote:
> > > > >
> > > > > > Hey all,
> > > > > >
> > > > > > I am writing a custom program to create a report. And
> > > > > > yes I know that templates would do this better, but I
> > > > > > don't have time to figure that system out right now.
> > > > > >
> > > > > > So I have my function that prints out everthing to the
> > > > > > screen just the way I want it (using standard
> > > > > > 'writes',and no USE's anywhere). Next, I want to be
> > > > > > able to send it to a printer device.
> > > > > >
> > > > > > So I 'do ^%ZIS'. Then I check for POP, and if
> > > > > > positive, I abort. I then 'use IO', and then I call
> > > > > > my function described above. I assume that all the
> > > > > > 'writes' should now go to the output channel, namely
> > > > > > the printer (IO). When I return from the function, I
> > > > > > 'use IO(0)' to restore the home device, and call
> > > > > > ^%ZISC.
> > > > > >
> > > > > > But still, my output goes to the screen, and my
> > > > > > printer output is empty.
> > > > > >
> > > > > > What am I doing wrong?
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > Kevin
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > __________________________________
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> > > forefathers.
> > > > > --Benjamin Disraeli
> > > > > ====
> > > > > Greg Woodhouse
> > > > > [EMAIL PROTECTED]
> > > > > [EMAIL PROTECTED]
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> > > > [EMAIL PROTECTED]
> > > > [EMAIL PROTECTED]
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> >
> > =====
> > A practical man is a man who practices the errors of his
> forefathers.
> > --Benjamin Disraeli
> > ====
> > Greg Woodhouse
> > [EMAIL PROTECTED]
> > [EMAIL PROTECTED]
> >
> >
> >
> >
> >
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>
> =====
> A practical man is a man who practices the errors of his forefathers.
> --Benjamin Disraeli
> ====
> Greg Woodhouse
> [EMAIL PROTECTED]
> [EMAIL PROTECTED]
>
>
>
>
>
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=====
A practical man is a man who practices the errors of his forefathers.
--Benjamin Disraeli
====
Greg Woodhouse
[EMAIL PROTECTED]
[EMAIL PROTECTED]
-------------------------------------------------------
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