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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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Most printer drivers maintain and manipulate device objects. Device objects
are structures that represent pens and brushes that the device supports.
 
To determine what device objects are available, GDI calls the EnumObj
function and expects the driver to enumerate all the pens and brushes that a
device supports. The function translates physical descriptions of the
objects into logical descriptions and returns these descriptions to GDI. All
logical objects created this way must be unique, that is, when translated
into physical objects and used for drawing, they should produce different
output.
 
The driver enumerates all the styles and colors of pens and brushes. Since
pens are defined to be only pure colors, only logical colors that translate
to pure physical colors will be enumerated. For devices that support many
colors, only a subset of all the colors will be enumerated.
 
 
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