ctypesを使ってみる

ctypesを使うとPythonからDLLや、Shared libraryを呼び出すことが出来る。

ctypes_test.py

from ctypes import *

msvcrt = cdll.msvcrt
message = "Python ctypes test\n"
msvcrt.printf(message)

ポインタや構造体、ユニオンもちゃんと定義できる。
以下は型の対応表。

ctypes type	C type	Python type
c_char	char	1-character string
c_wchar	wchar_t	1-character unicode string
c_byte	char	int/long
c_ubyte	unsigned char	int/long
c_short	short	int/long
c_ushort	unsigned short	int/long
c_int	int	int/long
c_uint	unsigned int	int/long
c_long	long	int/long
c_ulong	unsigned long	int/long
c_longlong	__int64 or long long	int/long
c_ulonglong	unsigned __int64 or unsigned long long	int/long
c_float	float	float
c_double	double	float
c_longdouble	long double	float
c_char_p	char * (NUL terminated)	string or None
c_wchar_p	wchar_t * (NUL terminated)	unicode or None
c_void_p	void *	int/long or None