Linkage confusion

In the printinglrb sample a code line says dc= get_dc;

I have searched my ruby installation for a get_dc method and found it
nowhere except in printing.rb.
I do find a getdc in Petazold.

After the dc =get_dc line in ruby there are a lot of dc references.
like

dc.set_background(Wx::WHITE_BRUSH)
dc.clear()
dc.set_font(Wx::get_app.test_font)

dc.set_background_mode(Wx::TRANSPARENT)

If I understood the ruby definition of the dc object I might understand
the
rest of this code. For your information, I have coded thousands of
lines
using the Microsoft interface. I have created many windows and many
text
and graphic files which I sent to the printer. My confusion is with
the
ruby implementation, not with the process itself.

Since I cannot find a ruby or wxruby reference, is there some magic
linkage
to some windowd dlls or some ther
mechanism that I do not understand?

From what I get from reading the code, ruby is presenting me with a cleaner
way to process printing, windows, and dialogs. I just need to be able
to
sync into it better.

I had expected this routine to be defined in Wx::DC.I downloaded the
wxruby
source and looked in dc.rb. I did not find get_dc or the dc.xxx
refernced
above. I I also did not find it in any on-line documentation that I
looked
at.

Help. I don’t understand something.

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