Barcode Writer in Pure PostScript

http://www.terryburton.co.uk/barcodewriter/


The monolithic barcode.ps file provides Barcode Writer in Pure PostScript as
generic PostScript Level 2 named resources shipped in a single file for ease of
inclusion within the Prolog section of a PostScript document template or for
installing into a printer's initial job VM.


Inclusion Within the Prolog Section of a Document

An application will first include the contents of barcode.ps in the Prolog
section of a PostScript file and then generate code like the following.

In the file's Setup or PageSetup section:

/qrcode dup /uk.co.terryburton.bwipp findresource def

and in the page description where a barcode is needed:

0 0 moveto (BWIPP) (eclevel=M) qrcode

If the application needs to import the resource under a different name to avoid
a conflict, then the setup could be:

/foo /qrcode /uk.co.terryburton.bwipp findresource def

followed by:

0 0 moveto (BWIPP1) (eclevel=M) foo
0 0 moveto (BWIPP2) (eclevel=M) foo
...

(The above is analogous to 'from uk.co.terryburton.bwipp import qrcode as foo'
in other languages.)

Or, to generate a few barcodes with no setup section or local name at all:

0 0 moveto (BWIPP) (eclevel=M) /qrcode /uk.co.terryburton.bwipp findresource exec

This technique also reduces the possibility of namespace collision when using
the library's procedures with other code.


Installing to a Printer Initial Job VM 
 
Send barcode.ps to the printer with the line "true () startjob" added at the
top where the parentheses contain the printer's startjob password. 
 
The named resources will remain available between jobs but will not persist 
accoss power cycles.

