jnative callback 回调函数的实现

    jnative 1.3.2版本发布了，可以完美支持C回调函数。不过令我很恼火的是还不支持activex dll的调用，问了jnative的作者，他说会在jnative 后继版本支持，大家期待吧！不然要用jacob，在一个项目里面用两种技术，我想任何人都不愿意这样做。
     首先定义一个回调类模板：

package com.syct.jnative.wrapper;

import java.util.ArrayList;
import java.util.List;
import org.xvolks.jnative.JNative;
import org.xvolks.jnative.exceptions.NativeException;

import org.xvolks.jnative.util.Callback;

public abstract class DataPackageCallback implements Callback  {
	private final List<Long> dataPackage;
	
	public DataPackageCallback() {
		dataPackage = new ArrayList<Long>();
	}
	public List getCallbackDataPackage() {

		ProcessCallbackDataPackage(dataPackage);
		return dataPackage;
		
	}

	public int callback(long[] values) {
		// TODO Auto-generated method stub
		
		if (values == null) {
			return 3;
		}
		if (values.length == 2) {
			try {
				if (values[0] > 0) {
					dataPackage.add(values[0]);
					System.out.println(values[1]);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
	
			return 1;
		} else {
			return 2;
		}
	}

//分配内存
	public int getCallbackAddress() throws NativeException {
		// TODO Auto-generated method stub
		return JNative.createCallback(2, this);
	}
//这个方法在子类实现
	protected abstract void ProcessCallbackDataPackage(List<Long> dataPackage);
}

    然后子类继承：

package test;

import java.util.List;


import org.xvolks.jnative.misc.basicStructures.HWND;

import org.xvolks.jnative.util.User32;

import com.syct.jnative.wrapper.DataPackageCallback;

public class MyEnumCallback extends DataPackageCallback{

	StringBuffer sb=new StringBuffer();
	public String getWindowEnumList(){
		return sb.toString();
	}
	/**
	 * MyEnumCallback要继承DataPackageCallback
	 * 这个方法得到回调参数的值
	 */
	@Override
	protected void ProcessCallbackDataPackage(List<Long> dataPackage) {
		// TODO Auto-generated method stub
	   
		for (Long key : dataPackage) {
			try {
				//System.err.println("Handle : " + key);
				String name = User32.GetWindowText(new HWND(key.intValue()));
			//	System.err.println("Name : " + name);
				if (name == null || name.length() == 0) {
				//	System.err.println("Skipping handle " + key);
				} else {
					sb.append(name).append("\n");
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}



}

     最后测试：

package test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.swing.JOptionPane;


import org.xvolks.jnative.JNative;
import org.xvolks.jnative.Type;
import org.xvolks.jnative.exceptions.NativeException;
import org.xvolks.jnative.pointers.memory.MemoryBlockFactory;
import org.xvolks.jnative.util.Callback;
import org.xvolks.jnative.util.User32;

import com.syct.jnative.wrapper.JNA_TRANS;
import com.syct.jnative.wrapper.JnaWrapper;
import com.syct.jnative.wrapper.JnaWrapperHandler;
import com.syct.jnative.wrapper.JnativeBase;

public class JnativeWrapperTest extends JnativeBase {

	static String DLL_NAME = "Reader_dll";
	JnaWrapper n = null;

	/**
	 * @JNA_TRANS表明这个方法在JnativeWrapper容器中 由JnativeWrapper自动关闭jnative连接
	 * @return int
	 */
	@JNA_TRANS
	public int readerInit() {

		int rev = -1;
		try {
			n = super.initJna(DLL_NAME, "ReaderInit");
			n.setRetVal(Type.INT); // 指定返回参数的类型
			int i = 0;
			n.setParameterInt(i++, 0);
			// 指定串口
			n.setParameterString(i++, "com1");
			// 波特率
			n.setParameterInt(i++, 9600);
			// 指定usb口
			n.setParameterString(i++, "usb1"); // 指定位置上的参数类型和值
			// 调用方法
			// 0 成功 -1 失败
			rev = Integer.parseInt(n.getRetVal());
			if (rev == 0) {
				System.out.println("==============初始化识读头的串口成功==============");
			} else if (rev == -1) {
				System.out.println("==============初始化识读头的串口失败==============");
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return rev;
	}

	/**
	 * @JNA_TRANS表明这个方法在JnativeWrapper容器中 由JnativeWrapper自动关闭jnative连接
	 * @return boolean
	 */

	@JNA_TRANS
	public boolean EnumWindows(Callback lpEnumFunc, int lParam)
			throws NativeException, IllegalAccessException {
		n = super.initJna("User32.dll", "EnumWindows");
		n.setRetVal(Type.INT);

		n.setParameterCallback(0, lpEnumFunc.getCallbackAddress());
		n.setParameterInt(1, lParam);
		;
		return !"0".equals(n.getRetVal());
	}

	public void testCallback() {
		try {
			User32.MessageBox(0, "Callback Demo", "JNative", 0);
		} catch (NativeException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IllegalAccessException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		MyEnumCallback c = new MyEnumCallback();

		try {
			MemoryBlockFactory.createMemoryBlock(1).dispose();
			if (EnumWindows(c, 0)) {
				System.err.println("EnumWindows suceeded");
			} else {
				System.err.println("EnumWindows failed");
			}
			System.err.println("getAvailableCallbacks "
					+ JNative.getAvailableCallbacks());
			JNative.releaseCallback(c);
			System.err.println(c.getCallbackDataPackage());
			User32.MessageBox(0, c.getWindowEnumList(), "窗体枚举(EnumWindows)", 0);
			JOptionPane.showMessageDialog(null, c.getWindowEnumList(),
					"窗体枚举(EnumWindows)", JOptionPane.OK_OPTION);

		} catch (NativeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	private interface MyFactory {
		public Object newInstance(int a, char[] b, String d);
	}

	public static void main(String[] args) {
		/**
		 * JnativeWrapperTest 要继承JnativeBase 通过JnaWrapperProxy返回一个代理实例
		 */
		 JnativeWrapperTest
		 test=(JnativeWrapperTest)JnaWrapperHandler.getJnaWrapperProxy(JnativeWrapperTest.class);
		// test.readerInit();
		  test.testCallback();

	}

}