🚀 go-pugleaf

malle@rpksun1.mach.uni-karlsruhe.de (Bernhard Malle) writes:

> Is there any PostScript Guru that knows the meaning of the following
> statement:
>
>	{(%%[|0|]%%)=print flush}

It translates to:

print the string "%%[|0|]%%" on stdout channel and flush that channel

This is the usual way to pass information to the host which transmitted
the PostScript file. The idea in this case is to keep track on the host
about the progress of the print job. This way the Macintosh spooling
software can inform you about the number of pages printed. The same
channel is used to transmit PostScript errors back to the host.

> this statement appears in some Macintosh-Postscript-files, that I have
> created by printing a Macintosh-document to a file instaed of printing
> it directly. I'm not sure, whether this statement is the reason for my
> troubles, but since the moment, I have included these Postscript-files
> into my LaTeX-document via psfig (after using m2u and pslinewrap and
> bbfig), our printer can't print more than 3 pages at a time. (error
> message is something like illegal restore).

Problems with Macintosh PostScript printed on non-laserwriters is not
uncommon unfortunately. The above print statement however is unlikely
to be harmful unless your printer spooler tries to interpret it and
draws wrong conclusions from it. Deleting it (see below) will tell.

As a side note: once I ambitiously started to disassemble the prolog of
the Macintosh PostScript trying to lay my finger on some problems we'd
encountered. But I had to give up this project due to lack of time.
Did anyone do a similar analysis and achieved results too?

>Does anyone knows how to avoid this command?

Just delete everything in between "{" and "}".


Jan van der Steen

-- 
    -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
     Jan van der Steen                 jansteen@cwi.nl
     Centre for Mathematics and Computer Science (CWI)
     Kruislaan 413, 1098 SJ Amsterdam, The Netherlands

In article <1k0c7bINN9gj@nz12.rz.uni-karlsruhe.de>  
malle@rpksun1.mach.uni-karlsruhe.de (Bernhard Malle) writes:
> Hello,
> 
> Is there any PostScript Guru that knows the meaning of the following
> statement:
> {(%%[|0|]%%)=print flush}

Sure.  =print prints that string, and then flush makes
sure you see it.

=print is defined here on my NeXT to be:

{
	dup type /stringtype ne {
		=string cvs
	} if
	print
}

Like =string, =print isn't documented.  In this case, you
could use print just as well.

> The interesting thing about the above mentioned statement is, that ghostview  
can
> display the diagrams correctly, but sends an error message with just 
> %%[|0|]%%

Yep.

> Does anyone knows how to avoid this command?

Just take it out.  If you aren't watching the output
channel, you won't see it anyway.

ab