jna指南

配置

引入相关jar

jna.jar
example.jar

放置相关so

字段对应

c	java
LONG	NativeLong
char[]	byte[]
byte	byte
byte[]	byte[]
BOOL	int
WORD	short or int
void*	Pointer
LP**	Pointer
struct	Structure
CALLBACK	Callback

LP**

LP**对应相关去除LP的继承Structure的类的getPointer()

struct

对应继承Structure的类

NET_**

对应常量

**CallBack

对应回调函数，继承Callback的接口

typedef void(CALLBACK *fLoginResultCallBack)(
LONG lUserID,
DWORD dwResult,
LPNET_DVR_DEVICEINFO_V30 lpDeviceInfo
void *pUser);

public static interface FLoginResultCallBack extends Callback{
    public int invoke(NativeLong lUserID, int dwResult, Pointer lpDeviceinfo, Pointer pUser);
}

函数

函数对应方法

BOOL NET_DVR_Init()
boolean  NET_DVR_Init();

string 长度计算

if (wide) {
int len = (string.length() + 1 ) * Native.WCHAR_SIZE;
pointer = new Memory(len);
pointer.setString(0, string, true);
}
else {
byte[] data = Native.toByteArray(string);
pointer = new Memory(data.length + 1);
pointer.write(0, data, 0, data.length);
pointer.setByte(data.length, (byte)0);
}