JNATIVE 调用dll方法
JNATIVE能很方面的调用dll中的方法：
C语言代码：

#include "stdafx.h"#include <Windows.h>#include <stdio.h>#include <stdlib.h>#include <string>#include <string.h> typedef int (*bOpenUsb20Video)();typedef int (*sGetBarData)(char *out);typedef int (*bCloseUsb20)();int main(int argc, char* argv[]){    HINSTANCEhDll;   //DLL句柄bOpenUsb20VideoDllbOpenUsb20Video;sGetBarDataDllsGetBarData;bCloseUsb20DllbCloseUsb20;    hDll = LoadLibrary("dllLpDecode.dll");if (hDll != NULL){DllbOpenUsb20Video = (bOpenUsb20Video)GetProcAddress(hDll,"bOpenUsb20Video");if(DllbOpenUsb20Video==NULL)   return 0;DllsGetBarData = (sGetBarData)GetProcAddress(hDll,"sGetBarData");if(DllsGetBarData==NULL)   return 0;DllbCloseUsb20 = (bCloseUsb20)GetProcAddress(hDll,"bCloseUsb20");if(DllbCloseUsb20==NULL)   return 0;}if (0 != DllbOpenUsb20Video ())return 0;int ret;char out[256];int count=10;while (count){ret = DllsGetBarData (out);if (ret == 1){printf ("result:%s\r\n",out);count --;}Sleep (100);}DllbCloseUsb20 ();FreeLibrary(hDll);return 0;}

/* * To change this template, choose Tools | Templates * and open the template in the editor. */package com.tfsm.movie.camera;import java.util.logging.Level;import java.util.logging.Logger;import org.xvolks.jnative.JNative;import org.xvolks.jnative.Type;import org.xvolks.jnative.pointers.Pointer;import org.xvolks.jnative.pointers.memory.MemoryBlockFactory;/** * * @author Administrator */public class HY100CameraDecoder {    static {        //加载HY100驱动        System.loadLibrary("lib/dllLpDecode");    }    public boolean openCamera() {        try {            JNative openCamera = new JNative("lib/dllLpDecode", "bOpenUsb20Video");            openCamera.setRetVal(Type.INT);            openCamera.invoke();            return openCamera.getRetValAsInt() == 0;        } catch (Exception ex) {            Logger.getLogger(HY100CameraDecoder.class.getName()).log(Level.SEVERE, null, ex);            return false;        }    }    public CameraDecodeResult getDecodeData() {        try {            JNative decodeData = new JNative("lib/dllLpDecode", "sGetBarData");            Pointer p = new Pointer(MemoryBlockFactory.createMemoryBlock(4 * 256));            decodeData.setParameter(0, p);            decodeData.setRetVal(Type.INT);            decodeData.invoke();            int resultCode = decodeData.getRetValAsInt();            CameraDecodeResult reuslt = new CameraDecodeResult();            //为1代表成功            if (resultCode == 1) {                String result = new String(p.getAsString().getBytes(), "UTF-8");                return reuslt.setSuccess(true).setResult(result);            }else{                return reuslt;            }        } catch (Exception ex) {            Logger.getLogger(HY100CameraDecoder.class.getName()).log(Level.SEVERE, null, ex);            return  new CameraDecodeResult();        }    }    public void closeCamera() {        try {            JNative closeCamera = new JNative("lib/dllLpDecode", "bCloseUsb20");            closeCamera.setRetVal(Type.INT);            closeCamera.invoke();        } catch (Exception ex) {            Logger.getLogger(HY100CameraDecoder.class.getName()).log(Level.SEVERE, null, ex);        }    }}