Print Spooler
The primary component of the printing interface is the print spooler. The
print spooler is a Windows executable file that manages the printing process.
Management of printing involves retrieving the location of the correct printer
driver, loading that driver, converting high-level function calls to journal
records, storing those journal records on disk as a print job, and so on.
The spooler is loaded at startup and continues to run until the operating
system is shut down. Windows Print Manager provides a graphical interface that the
user or system administrator can use to access and configure the spooler;
however, if Print Manager is disabled or shut down, the spooler continues to run.
Applications that print create a printer DC. When an application creates a
printer DC, the spooler performs necessary tasks such as determining the location
of the required printer driver and then loading the appropriate printer driver.
It also determines the data type used to record the print job. The supported
data types include journal records, ASCII text, and PostScript®. A print job is a document stored internally (by using one of the supported
data types) that may contain one or more pages of output. It may consist of
multiple forms; for example, a job may consist of one envelope and three pages of
A4 paper. A print job is defined (or bracketed) by the
StartDoc and
EndDoc functions.
The default data type for a print job is the journal record. A journal record
is a compact structure used to store text output commands, raster graphics
commands, and so on. When an application calls
StartDoc, the spooler creates a journal file and a data file and begins storing
journal records in the journal file. Each time the application calls one of the GDI
drawing functions, one or more new journal records are created and stored in the
journal file. The journal and data files are created in an operating system
directory. The spooler uses the journal file to store journal records and uses
the data file to record the type of form, the data type for the print job, the
target printer, and so on. These files are deleted by the spooler when the job
has successfully printed.
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