For environments in which users are confronted with a myriad of printers
to choose from, HP SharedPrint provides a simple graphical interface that
enables users to select a target printer and a set of options without
encountering the typical problems associated with this process.
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Specification
User
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• Print File
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User’s Job
Specification
Queue and Control
•
•
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• Locate Printer
• Set Up Communication Path
Format
Filter
Apply Device Control
Dequeue and Output
Queue
Feedback
Output to Printer
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SharedPrint feedback server 2 and 3 . The feedback server
hands sprint a set of valid options based on the user's inputs
4 . The option information is used to validate which options
the user can select for the current job.
After completing the job specification, the user selects the OK
button in the sprint window to queue the job for printing. At
this point the job request moves to the line printer spooler
(lp) client 5 . The lp client packages the print request and
connects to the lpsched daemon located on the lp server 6 .
The lpsched daemon places the job request in the printer
queue and at the appropriate time starts the HP SharedPrint
job processor to process the job 7 .
HP SharedPrint's graphical user interface for system
administration.
The HP SharedPrint server includes the HP SharedPrint job
processor, configuration files that specify various mappings,
filters, and drivers that perform translation and formatting,
and the HP SharedPrint feedback server. Data from the conĆ
figuration files is used by the feedback server and the job
processor. The feedback server uses the data to provide opĆ
tion information to the sprint user interface, and the job proĆ
cessor uses the data to define the processing steps. The job
processor invokes the filters and drivers to finish processing a
job. The filters translate and format data files going to the
selected printer, and the drivers place deviceĆspecific control
information in the data stream going to the printer.
mentioned above. Fig. 5 shows a highĆlevel view of the HP
SharedPrint client/server system. The job specification client
communicates with the HP SharedPrint server via the base
spooling system. The server provides realĆtime feedback to
the user about what options are valid for a specific job and
printer combination.
One of the major features of HP SharedPrint is its ability to
print many of the common file types† transparently on any
of the supported printers. This functionality eliminates the
need for the user to know which file types can be printed
on which devices.
The HP SharedPrint server, being highly configurable, can be
used to drive smart as well as dumb printers. Also, because
of its highly modular design, the server can be layered on
any spooling system.
Fig. 6 shows a detailed view of the main components that
make up the HP SharedPrint client/server system. The HP
SharedPrint client contains the graphical user interface proĆ
grams sprint (HP SharedPrint print) and spadmin (HP SharedĆ
Print administration). Sprint prompts the user for the file to
print ( 1 in Fig. 6) and the designated printer and then uses
NCS (network computing services) to connect to the HP
•
•
•
•
The sprint print client enhances the basic HP VUE printing
model by providing an easyĆtoĆuse graphical interface. Sprint
does not alter or replace the current HPĆUX* spooling system
functionality but is layered on top of the spooling system.
This leads to a smooth transition from the standard HPĆUX
printing models to HP SharedPrint. The sprint graphical user
interface allows users to:
Select a file to print via a drag and drop operation from the
HP VUE file manager interface
Select a printer from a displayed list of printers
Set options based on realĆtime feedback
Save groups of options for reuse later on similar print jobs.
† A file type is a special data format required of all printers, such as PCL image files, RTL (raster
transfer language), PostScript, or applications (image or text).
HP-GL 2
Images
Text
PostScript
PCL
File Types
File
Printers
Graphical
User
Interface
Printer
and
Options
Screen
Job
Specification
Client
System
Administration
Screen
HP SharedPrint
Server
Base Spooling System
Client Side
Feedback
PostScript
PCL
Dumb
Raster
HP-GL 2
April 1994 HewlettĆPackard Journal
Server Side
A highĆlevel view of
HP SharedPrint's client/server
architecture.
Printer
Location
Information 3
HP SharedPrint
Client
Global
Location
Broker
HP SharedPrint
Server
Register
Printer, File 2
4
Options
Feedback
Server
HP SharedPrint
Configuration Files
NCS
HP SharedPrint Job
Processor
User
1
spadmin
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Cancel
sprint
lpstat
lp
5
Queue
Job
Process
Job
6
7
lpsched
Daemon
HP-UX
Spool
System
Information
lp Client
lp Database
Control
Processed
Output
I/O
Driver
Printer
Feedback
LAN
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Job Processing and
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HP SharedPrint Job Processor
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Configuration
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•
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"#%*!) ) '()' " # $#(*"' )) $#+')(
) " !''. $*)%*) )$ $()'%) $' !
Drivers. *#)$# $ '+' ( )$ $ $#)'$! #$'/
")$# )$ ) ) ()'" %'$* . ) !)'( ) $( #$)
#)'%') $' # ) ) ()'" *) ( %'#)'/(%
$""#( )$ ) .) ()'" # $ ) '+' ( #!#
%'#)'/(% *#)$#( ,'( !)'( #! !#*/
(% *#)$#(
$ $#)'$! #$'")$# %#( $# ) )') %'#)'
$ $#)'$! )*' # ) %'#)' # (!) $' ()
. ) (.()" "#()')$' ,# ) %'#)' ( $#*'
$' (% . *('( # )' %'($#! $%)$#( !(
# "$() (( ) '+' ,!! (# ' ,) #. $
$#)'$! #$'")$# )# cat ) #%*) ()'" '$" ) !)'(
)$ ) $*)%*) ()'" # ($" (( ) '+' ,!! + )$
-"# ) '() , .)( $ ! )$ ( )' ' #.
'() $#)'$! ')'( )) ") #)'' ,) ) '+'
' ()'" $' #()# !( ". $#)# # ESC E
)) '()( ) %'#)' ()) '+' ,!! + )$ ()'%
)( .)( ' "*() (#)
Command Line → <Job, User, Title, Copies, Options, Files >
Parse
Command
Line
Printer
Configuration
File
Options
Options From
Command Line
File Type
Determined
No
Print Error
Page
Yes
Printer File Type
Data File Type
Build
Pipeline
Abort Job
Send Mail
to User
Execute
Pipeline
Get
Next
Copy
Get Printer Type. . ()% # %'$%'!. %'$((# $ ( )$
#$, ) ')'()( $ ) )') + # (*
%'#)' ')'() ( ) ).% $ !#*( $' ! ).%( )
%'#)' *#'()#(
Build Options List. $ #!*( !() $ $%)$#( # (/
($) +!*( $%)$#( !() ( *!) '$" *!) +!*(
# # ) %'#)' $#*')$# ! +!*( %(( . )
*(' $' +!*( . ) !)'( ('/(% $%)$#(
$+'' $%)$#( # # ) %'#)' $#*')$# ! $'
) !)'(
Print Banner
Page
Get File
Type
"# %*'%$( $ )( "$*! ( )$ #!$( ) (%(
$ (%$$!# (.()" # $# !$)$# ($ )) ) %'$(( $
%$')# ''#) )$ #, (%$$!# (.()" ,$*!
#+$!+ ## $#!. )( "$*!
%'#)' ! ).%( ' !() # ) %'#)' $#*')$#
! , ( ') ,# %'#)' ( )$ ) (%$$!#
(.()" ( ()% #+$!+( %'(# ) $#*')$# ! $'
) )') %'#)' #$ !/).% #)'. -()( # ) $#*'/
)$# ! $' ) $#*')$# ! ##$) !$) # ''$'
% ( (#) )$ ) %'#)' ) %'#)' ( (! # "!
"(( ( (#) )$ ) *(' ,$ &** ) $
Build
Options
Front
Banner
Page
$' %'#) $ ) ''#) $ %'$(($' -/
*)( ) !$')" $*)!# # $ ) ()%(
# '%'(#)( "$*! $' #!# $ #+$!+ #
%'$((# $
Parse Command Line. ( ()% ( ) #)' )$ ) (
(%$$!# (.()" (%$$!# (.()" %((( ) $ ) )$
) %'$((# "$*!( # ,!!/# $'" $' )
/ (%$$!# (.()" ) $ %'$((# "$*! ( !!
+ ) lpsched "$# ,) ) (- $""# !# '*"#)(
(' '!' $""# !# #$'")$# ,
#!*( ) *(' #" %'#)' #" $ $%)$#( # !(
)$ %'#) ( $!!) # ()$' # ) $ %'$(($' $' *(
( %%'$%')
Get
Printer
Type
Last Copy?
No
Get
Next
File
Yes
Last File?
No
Yes
Print Rear
Banner
Page
$ %'$((# !$')"
('/(% $%)$#( # %(( '$" sprint + ) lp
$""# !# # ) ''#) $%)$# #"( '
%'! ,!))/ ' $*'#!
PostScript banner page.
fullĆlength strings, a set of aliases, which are defined in the
options configuration file, can be used on the lp command
line. The buildĆoptionsĆlist operation will expand the aliased
strings when the options list is built.
Front Banner Page. This step involves building and sending a
banner page to the printer. This function creates a banner
page file, then recursively calls the job processor to send it
to the printer. In this way, any type of banner page can be
sent to any printer. HP SharedPrint includes a banner page
program for PostScript, PCL 5, and ASCII text. Fig. 10 is an
example of the PostScript banner page.
The sprint dialog box asking about file type.
the file type if the job processor cannot determine the file
type. In this case sprint will pop up the dialog box shown in
Fig. 11, asking the user to select one of the values.
• File type reader. This method compares the spooled file's
contents with a predefined set of patterns for specific file
types. These patterns are coded as C programs or Korn shell
scripts. Each one of these programs or scripts expects a file
as input. If the file type matches the defined pattern, the
program or script writes the type string to standard output
and returns an exit code of 0 to the calling routine. If there
Get File Type. This step determines the spooled file's file type.
is no match, the program or script returns an exit code of 1.
The job processor must know the file type of a job to deterĆ
mine if any processing is necessary to format the spooled
A special fileĆtype program, based on the image library, is
file for the target printer. For instance, a PostScript file must
used for identifying image files. The image library includes a
be converted to PCL to print on an HP LaserJet printer. The
set of functions that allow programmers to open a file and
fileĆtyping process uses the following three methods (in the
determine if it is a file type that is supported by the image
order given) to determine the file type for a job:
library. If the image library can process the file, the image
• Command line switch
fileĆtype program writes the string bitmap" to standard
• File type reader
output and exits with a status code of 0.
• File extension value.
The module that determines a job's file type executes each of
When a file type is found from any of these methods, the
the fileĆreading programs and scripts located in a directory
fileĆtyping process terminates. If the file type cannot be deĆ
called filetypes until a match is found. If no match is found
termined from any of the above methods, an error page is
after all the programs have been invoked, the file extension
printed, and the job is aborted.
mechanism is used to determine the file type.
• Command line switch. With this method if the user includes
the fileĆtype option flag (–file_type) on the command line, the
fileĆtype value will be set to the value following the –file_type
flag. In this case HP SharedPrint assumes the user has some
knowledge of the file's content that HP SharedPrint cannot
determine. The sprint program will also prompt the user for
April 1994 HewlettĆPackard Journal
• File extension value. File extensions are used by HP VUE to
map file types to actions. For example, the extension .au is
associated with the audio server, a process that plays or
records audio files. HP SharedPrint uses many of the same
extension values, mapping them to a file type in the object
name extension file. The extension value is extracted from
HP-UX Pipes
Print
Driver
Filters
Data File
(File to Be Printed)
Printer
$+ '$) ./" . - / 0-$)" /# +$+ '$) 0$'$)" ./ +
$) /# %* +-* ..$)" +#. Job Options
/# ' ! )( *! /# *-$"$)' !$' /#/ $. +.. 4 sprint $) /#
lp .+**' - /$/' *+/$*)
2-$/ . '' --*- *- 2-)$)" ( .." . /* ./)- --*- #
%* +-* ..*- - $- /. /#$. / 3/ /* /# --*- '*"
Build Pipeline. # +-* ..$)" +$+ '$) + -!*-(. /# /0'
2*-& *! " //$)" !$' +-$)/ *) /# /-" / 1$ # +$+ 8
'$) *).$./. *! *) *- (*- !$'/ -. ) -$1 - 2$/# /#
*0/+0/ *! # ./" +$+ $)/* /# $)+0/ *! /# ) 3/ ./"
. .#*2) $) $" / /#
--*--*--*/# /
# +$+ '$) $. -$1 !-*( /# +-$)/ - !$' /4+ ) /#
/ !$' /4+ # +$+ '$) 0$' - .). /# +$+ '$) *)!$"8
0-/$*) !$' '**&$)" !*- !$' /4+ (/# . *- # (/#
*) *- (*- !$'/ -. $. .+ $!$ /* + -!*-( /# /-).'/$*) !
)* (/# $. !*0) !*- /# .+ $!$ !$' /4+ . ) --*- +"
$. +-$)/ ) /# %* $. *-/ $")*./$ $)!*-(/$*) $. $)'0 $) /#
/# )'4.$. *! /# +-*' (
# +$+ '$) $. / -($)/ 4 $)" -$1 - (*0' /* /#
!$'/ - +$+ '$) # -$1 - $. / -($) !-*( /# +-$)/ - *)8
!$"0-/$*) !$' # +$+ '$) ./-$)" / /#$. +*$)/ 2$'' #1 /#
!*-(/ !$'/ -767!$'/ -767-$1 - */ /#/ # !$'/ - ($"#/ !$'/ - )( !*''*2 4 .*( *+/$*). /#/ *)/-*' #*2 /#
!$'/ - $. 3 0/ # +$+ '$) $. *(+' / 4 $)" /# ++-*+-$/ *+/$*).
/* # !$'/ - ) /# -$1 - # !$'/ - *+/$*). !$' (+. *+8
/$*). /#/ ++'4 /* # !$'/ - *- -$1 - .* /#/ /# *-- /
-"0( )/. - +.. /* /# !$'/ -. # !$)' +$+ '$) ./-$)"
($"#/ '**& '$& txpcl –charheight 8 –orientation landscape | lj3.sh –copies 1
Execute Pipeline. # +$+ '$) - / $) /# 0$'8+$+ '$)
./" $. )*2 3 0/ # *0/+0/ !-*( /# './ ./" *! /#
+$+ '$) $. . )/ /* ./)- *0/+0/ 2#$# 2$'' /# *)) /$*) /* /# +-$)/ -
! )4 --*-. *0- $) /# +$+ '$) 3 0/$*) +#. /# 4 *'' / ) +' *) ) --*- +" 2#$# $. +-$)/ /
/# ) *! /# %* # --*- +" !0)/$*) $. '' 2# )
.*( 0)- *1 -' 1 )/ *0-. .+ $' '*" !$' *)/$).
'' /# *0/+0/ !-*( /# +-$)/ .-$+/ # !$'/ - *- -$1 -
*(+' /$*) *! /# %* /# %* +-* ..*- .). /#
'*" ! )4 $)!*-(/$*) *- ( .." . - !*0) $) /#
'*" /# %* +-* ..*- 0$'. / 3/ +" *)/$)$)" /#
( .." . ) .*( 0" $)!*-(/$*) ) /# ) +-$)/.
3/ +" *) /# +-$)/ -
--*- +" /* $ $)
Final Steps. # './8*+4 ./ + 3 0/ . /# +$+ '$) "$) $!
)*/# - *+4 $. ) ) /# './8!$' ./ + 4' . /# .-$+/
& /#-*0"# +-* ..$)" /# ) 3/ !$' $! /# - - (0'/$+'
!$' . /* +-$)/ # ) - 4'$)" $. - ,0$- /# $)$/$' .// *!
/# *+/$*). +-$)/ - *)!$"0-/$*) !$' ) *0/+0/ /4+ - 8
($) /# .( ) * )*/ ) /* - '0'/ $)''4
/# - - )) - ./ + 2#$# $. $ )/$' /* /# !-*)/ )) +" (4 0. /* +-$)/ %0./ .#*-/ /-$' - *- $) /# .
*! +-$)/ -. /#/ +-$)/ ! 0+ /# )) - +" .#*0' +-$)/ # - # ! & . -1 - # '+. 0. -. .+ $!4 %* +-( / -. /#/
*+/$($5 /# #-8*+4 *0/+0/ !*- "$1 ) %* $/#*0/ /#$.
! & 0. -. ) .$'4 *1 -2# '( 4 /# '-"
)0( - *! 1$'' *+/$*). 4 )'$)" *)'4 /#*. *+/$*).
/#/ ++'4 /* /# 0-- )/ %* /# ! & . -1 - "0$ . /#
0. - /#-*0"# /# %* .+ $!$/$*) +-* ..
# ! & +-* .. .#*2) $) $" "$). 2$/# /# 0. . ' /$)" !$' /* +-$)/ *) .+ $!$ +-$)/ - # sprint +-*8
"-( 0. . /# ) /2*-& *(+0/$)" . -1$ . /* *)) /
/* /# . -1 - ) .& !*- '$./ *! 1'$ *+/$*). # ! &
. -1 - 3 0/ . /# '"*-$/#( .#*2) $) $" ) - /0-). '$./ *! 1'$ *+/$*). /* /# '$ )/ # sprint +-*"-( /# ) )8
' . /# 0. - /* . ' / *)'4 /# *+/$*). - /0-) 4 /#
! & . -1 - $.''*2$)" 4 $(($)" . ' /$*). *) /#
( )0 */# - *+/$*). /* /# 0. -
LAN
Feedback Server
Printer
File and Printer
User
Options List
Sprint
Network
Computing
Services
File
Get Printer Type
Get File Type
Build Pipeline
Copies, Columns,
Orientation
Return Options
# ! & . -1 /$*) ) / !'*2
+-$' 2' //8&- *0-)'
%&)%$( )) &&". )% +$ &'$) % ' *$)%$ %
$%) %$". ) )') &'$)' *) "(% $. ")'( )) #. &'%0
(( ) % $ ) (#&"() ()*)%$ " ,%( ).&
#)( ) &'$)' ).& $ ($) ,)%*) $. ")'$ $
)( ( ) () % +" %&)%$( ,"" *$)%$ % )
&.(" )*'( % ) &'$)' (* ( *&"- %' &&' )'.
(")%$
+$ $ ) ( $ , ) " ).& #)( ) &'$)'
")'( $ $(') )% &'%'# (%# &'&'%(($ %'
%'#))$ %' -#&" %()'&) %*#$) $ &(( )'%* ")' )) &"( #%' )$ %$ "%"
& %$ &.(" &
''$) &'%#&*)( ) ")'( )) ,"" *( )%
&'%(( % ( $%'#)%$ ( )$ *( )% -)') )
(*&&%') %&)%$( '%# %$ % ) "( %$)$$ ) %
&'%(($ $ ! '*"( ) ( )( () % %&)%$( ))
) *(' (( $ ) '&" *(' $)'
"%$ ,) %&)%$ ( ) +"* )) )% )) %&)%$
")' &'%(($ ) % #*() %) $ %&)%$ $
+"* (%*' % ) +"* %#( '%# %$ % )'
"%)%$(
) *(' ) &'$)' %$*')%$ " %' ) ")'
$ ($$ %'' %' -#&" ) *(' (&( $
%&)%$ $ +"* )( &' ( &(( )% ) ")' )',(
+"* -()( $ ) %$*')%$ " ) ( *( $"". $ %&)%$ $ +"* ' $%) &(( )% ")' ) ")' *((
&'" ,"))0!' %*'$"
*")0$ *") +"* %' ) %&)%$ $ )( ,. ) 0
+%' % ")' ( %$)'%"" '() . ) *(' )$ ) (.(0
)# #$()')%' + ) %$*')%$ " $ $"". )
&'%'##'
$ &'%"# ,) %&)%$( ( )) )' ( $% *$ $#$
(# ,% ")'( #. &'%+ ) (# *$)%$"). $
*( '$) ()'$( )% $%) $ %&)%$ ''$)
'((( )( . &'%+$ ) %&)%$( " )% "( ")'
%&)%$ $#( )% () % $#( $ . ''$)
''$) &'%+( %,' ,) '%*() &'$)$
(%"*)%$ ('( $ ' $ '%& $. %,' % ) )%
$. &'$)' $ *( ) ''$) '&" *(' $)'0
)% %$)'%" ) &'$)$ &'%(( '&" *(' $)'0
'(( *(' '*()')%$ &'%+$ $ (.0)%0*(
&'$)$ $)' $)""$) ('+' "%,'( ) (.()#
#$()')%$ *'$ . "#$)$ )()'%& "*'(
$ &'%+$ ) "-"). )% *()%#/ &'$)'( +%'
PostScript is a trademark of Adobe Systems Incorporated which may be registered in certain
jurisdictions.
HP-UX is based on and is compatible with UNIX System Laboratories’ UNIX* operating system.
It also complies with X/Open’s* XPG3, POSIX 1003.1 and SVID2 interface specifications.
UNIX is a registered trademark of UNIX System Laboratories Inc. in the U.S.A. and other countries.
X/Open is a trademark of X/Open Company Limited in the UK and other countries.