Spooler Programmer's Guide

Spooler Programmer’s Guide—522287-002
A-1
A Sample Print Process
This appendix shows an example of a print process. It includes a description of the
program and the code.
The example has been kept as simple as possible in the interest of clarity.
Simplifications include the following:

Only one job at a time can be printed.

No form alignment is performed.

The record size of all devices is assumed to be 132.

The truncation flag is ignored.

The print process parameter and device parameter are not used.
The structure of the sample print process is such that these features can easily be
implemented.
INT .p^buf[0:63], ! print control buffer
.job^buffer[0:559], ! job buffer
.data^line[0:65], ! next line of data
count^read, ! number of bytes in "data^line"
.out^buf[0:65], ! buffer written to device
.time^array [0:6], ! date & time for header pages
recv^fnum, ! $RECEIVE file number
supv^fnum, ! supervisor file number
dev^fnum, ! device file number
data^file^fnum, ! collector data file number
busy^flag := 0, ! true when a job is printing
suspend := 0, ! true when a job is suspended
suspended := 0, ! true when a job is suspended due
! to a write error
end^of^job^flag := 0, ! true = indicates end of job,
! start job clean-up tasks
header^index :=0, ! true = print job banner page
msg^type, ! used to send error to supervisor
successful^op := 1; ! used to determine which message
! type is sent on device error
! information returned by
! PRINTREADCOMMAND
STRUCT DEV;
BEGIN
INT flags; ! indicates the state of the
! device's header and
! truncation flags
INT param; ! parameter specified in the
! "DEV, PARAM" SPOOLCOM
! command
INT width; ! value specified in the "DEV,
! WIDTH" SPOOLCOM command
INT job^num; ! spooler-assigned job number
INT locationname[0:7]; ! location name
INT formname[0:7]; ! form name
INT reportname[0:7]; ! report name
INT page^size; ! number of lines per page
END;
Note. The program presented in this appendix can be compiled and run exactly as presented.
However, it is not a supported software product of HP and has not undergone the rigorous
testing given to an officially released product. Please keep this in mind when adapting the
code for your needs.