JNA编程之数据类型映射

本文详细介绍了Java与C及操作系统数据类型的映射关系,包括基本数据类型、字符串、结构体等,并提供了JNA支持的数据类型映射表。

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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".

 

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