JNA编程之数据类型映射

 

1 ，当前路径是在项目下，而不是 bin 输出目录下。

2 ，数据结构的对应关系：

Java—C和操作系统数据类型的对应表

Java Type	C Type	Native Representation
boolean	int	32-bit integer (customizable)
byte	char	8-bit integer
char	wchar_t	platform-dependent
short	short	16-bit integer
int	int	32-bit integer
long	long long, __int64	64-bit integer
float	float	32-bit floating point
double	double	64-bit floating point
Buffer   Pointer	pointer	platform-dependent (32- or 64-bit pointer to memory)
<T>[] (array of primitive type)	pointer   array	32- or 64-bit pointer to memory (argument/return)   contiguous memory (struct member)
除了上面的类型， JNA 还支持常见的数据类型的映射。
String	char*	NUL-terminated array (native encoding or jna.encoding )
WString	wchar_t*	NUL-terminated array (unicode)
String[]	char**	NULL-terminated array of C strings
WString[]	wchar_t**	NULL-terminated array of wide C strings
Structure	struct*   struct	pointer to struct (argument or return) ( or explicitly )   struct by value (member of struct) ( or explicitly )
Union	union	same as Structure
Structure[]	struct[]	array of structs, contiguous in memory
Callback	<T> (*fp)()	function pointer (Java or native)
NativeMapped	varies	depends on definition
NativeLong	long	platform-dependent (32- or 64-bit integer)
PointerType	pointer	same as Pointer

 

 

Unsigned types use the same mappings as signed types. C enums are usually interchangeable with "int".

 

参考链接： https://github.com/twall/jna/blob/master/www/Mappings.md