[Python-3000] Ctypes as cross-interpreter C calling interface

Paul Prescod paul at prescod.net
Fri Aug 11 01:57:59 CEST 2006

And if you're curious about how to use ctypes without all of the helper
functions set up for you, then I guess it is easiest to poke around the
documentation for code samples.

>>> printf.argtypes = [c_char_p, c_char_p, c_int, c_double]
>>> printf("String '%s', Int %d, Double %f\n", "Hi", 10, 2.2)
String 'Hi', Int 10, Double 2.200000

>>> from ctypes import c_int, WINFUNCTYPE, windll
>>> from ctypes.wintypes import HWND, LPCSTR, UINT
>>> prototype = WINFUNCTYPE(c_int, HWND, LPCSTR, LPCSTR, c_uint)
>>> paramflags = (1, "hwnd", 0), (1, "text", "Hi"), (1, "caption",
None), (1, "flags", 0)
>>> MessageBox = prototype(("MessageBoxA", windll.user32), paramflags)

It's ugly but in the typical case you would hide all of the declarations in
a module (maybe an auto-generated module) and just focus on your logic:

>>> MessageBox()
>>> MessageBox(text="Spam, spam, spam")
>>> MessageBox(flags=2, text="foo bar")

 Paul Prescod
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