JNative的初步使用

下载地址:

JNative_1.4RC2_src.zip : http://jaist.dl.sourceforge.net/sourceforge/jnative/JNative_1.4RC2_src.zip

JNative.jar : http://nchc.dl.sourceforge.net/sourceforge/jnative/JNative.jar

如果以上版本不能完成下载,说明版本有可能更新,请从以下地址中下载:

Resource URL: http://jnative.sourceforge.net/ 

Source Code: http://sourceforge.net/projects/jnative 

Detailed Review: http://jnative.free.fr 

JavaDOC： http://jnative.free.fr/docs/

JNative相对于其它同类开源组件的优点:

1.容易使用

2.对数据类型的处理做的出色

3.支持CallBack

下面以一个小Demo来学习一下JNative:

1.理解文件用途

JNative_1.4RC2_src.zip是JNative源代码的压缩包把它解压后从中找到libJNativeCpp.so和JNativeCpp.dll两个文件.JNativeCpp.dll应用在Windows平台下.把它放在c:\windows\system32目录下.libJNativeCpp.so应用在Linux平台下.放在哪个目录,这个我不知道.

把JNative.jar加入到所需的工程中.

把要调用的dll文件也放在c:\windows\system32目录下, 这个目录存在一个文件，

2.测试类

 

package sms;

import org.xvolks.jnative.JNative;
import org.xvolks.jnative.exceptions.NativeException;
import org.xvolks.jnative.pointers.Pointer;
import org.xvolks.jnative.pointers.memory.MemoryBlockFactory;

public class SystemTime extends org.xvolks.jnative.util.Kernel32.SystemTime {
		public short wYear;
		public short wMonth;
		public short wDayOfWeek;
		public short wDay;
		public short wHour;
		public short wMinute;
		public short wSecond;
		public short wMilliseconds;
	   /**
	    * 分配内存，并返回指针
	    */
	   public Pointer createPointer() throws NativeException {
	       pointer = new Pointer(MemoryBlockFactory.createMemoryBlock(getSizeOf()));
	       return pointer;
	   }

	   /**
	    * 内存大小
	    */
	   public int getSizeOf(){
	       return 8 * 2;
	   }

	   /**
	    * 获取通过内存指针解析出结果
	    */
	   public SystemTime getValueFromPointer() throws NativeException {
	       wYear = getNextShort();
	       wMonth = getNextShort();
	       wDayOfWeek = getNextShort();
	       wDay = getNextShort();
	       wHour = getNextShort();
	       wMinute = getNextShort();
	       wSecond = getNextShort();
	       wMilliseconds = getNextShort();
	       return this;
	   }

	   public SystemTime() throws NativeException{
	       super();
	       createPointer();
	   }

	   public String toString(){
	       return wYear + "/" + wMonth + "/" + wDay + " at + " + wHour + ":" + wMinute + ":" + wSecond + ":" + wMilliseconds;
	   }

	   public static SystemTime GetSystemTime() throws NativeException, IllegalAccessException {
	       // 创建对象
	       JNative nGetSystemTime = new JNative("Kernel32.dll", "GetSystemTime");
	       
	       //GetSystemTime  是dll中的方法
	       SystemTime systemTime = new SystemTime();
	       // 设置参数
	       nGetSystemTime.setParameter(0, systemTime.getPointer());
	       //执行方法
	       nGetSystemTime.invoke();
	       // 解析结构指针内容
	       return systemTime.getValueFromPointer();
	   }

	   public static void main(String[] args) throws NativeException, IllegalAccessException{
	       System.err.println(GetSystemTime());
		     
	   }
	  
}

 

评论

1 楼 cxysilahi 2015-12-07  

请问WIN7 64位，调用报错
Exception in thread "main" java.lang.IllegalStateException: JNative library not loaded, sorry !
at org.xvolks.jnative.JNative.<init>(JNative.java:512)
at org.xvolks.jnative.JNative.<init>(JNative.java:440)

，我已经把.DLL文件放到C:\Windows\System32了