Python ctypes 數據類型

Python ctypes 數據類型

節錄自官網 https://docs.python.org/3.6/library/ctypes.html:

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

一些例子

>>> s = "Hello, World"
>>> c_s = c_wchar_p(s)
>>> print(c_s)
c_wchar_p(139966785747344)
>>> print(c_s.value)
Hello World
>>> c_s.value = "Hi, there"
>>> print(c_s)              # the memory location has changed
c_wchar_p(139966783348904)
>>> print(c_s.value)
Hi, there
>>> print(s)                # first object is unchanged
Hello, World
>>>

個人比較常用的是 ctypes 的 Structure 解析 binary file 中的結構，下次再跟大家介紹。