Re: [hylafax-users] [QSF] Re: HylaFAX and PCL

[Philip Gwyn <liste@xxxxxxxxxxxxx>]

On 23-Jan-2008 Jean-Pierre Radley wrote:
> Lee Howard typed (on Tue, Jan 22, 2008 at 05:09:13PM -0800):
> 
>> Second (the more significant issue), it appears the there is no sure-fire 
>> way to identify a PCL file.  You can see from your system's "magic" file 
>> (often /usr/share/magic) that PCL file detection is a bit of a 
>> best-guess/probability approach... and it's further-muddied by HP's PJL 
>> wrappers around both PCL and non-PCL (usually Postscript) data and the 
>> likelihood that users will want to process PJL-PCL files as if they were 
>> PCL (because GhostPDL seems to usually support that).  So we need to take a 
>> look at how to type the PCL files you'll be sending, at least.  That typing 
>> information will need to be added to typerules (for the client-side) as 
>> well as hfaxd/FileSystem.c++ (for the server-side).  Once we can reliably 
>> type the PCL files that you'll be sending then this issue should not impact 
>> you any longer.  (I am told that the <ESC>E<ESC> is the most-reliable way 
>> to detect non-PJL PCL data, and this typing detection is *not* present in 
>> 5.2.1.)
> 
> <ESC>E (0x1b45) is the PCL command for resetting a printer to its
> defaults.  Another <ESC> *may* follow to introduce some other PCL
> instruction(s), but an <ESC> by itself signifies nothing and I can't
> imagine it ever occuring.

The point of <esc>E<esc> is that it's the reset command, followed by any other
command.  The rest of that command is ignored.

-Philip 


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