jnative实现调用动态库（2）

2007-07-25 20:33

简单测试，Javadoc 下和官方网上有些例子，下面的是我随便从IC读卡程序中找了个DLL进行的测试： SCReader.dll 下的SCHelp_HexStringToBytes()函数原型 SCREADER_API WINAPI long SCHelp_HexStringToBytes( LPCTSTR pSrc, BYTE* pTar, int MaxCount ); 注意：dll文件需要放到System32下，否则可能找不到   通过Jnative 用java 来调用代码如下： package onlyfun.dllcall; import org.xvolks.jnative.JNative; import org.xvolks.jnative.exceptions.NativeException; import org.xvolks.jnative.pointers.Pointer; import org.xvolks.jnative.pointers.memory.MemoryBlockFactory; import org.xvolks.jnative.Type; public class UserCall {     /**     * return 转换成功的字节数     */     static JNative Something = null;     static Pointer pointer;     public String getSomething(String pSrc, Pointer pTar, int MaxCount) throws NativeException, IllegalAccessException{              try{            if(Something == null){               pTar = new Pointer(MemoryBlockFactory.createMemoryBlock(36));               Something = new JNative("SCReader.DLL", "SCHelp_HexStringToBytes"); // 利用org.xvolks.jnative.JNative 来装载 SCReader.dll，并利用其SCHelp_HexStringToBytes方法               Something.setRetVal(Type.INT); // 指定返回参数的类型            }            int i=0;            Something.setParameter(i++,pSrc);            Something.setParameter(i++,pTar);            Something.setParameter(i++,MaxCount);            System.out.println("调用的DLL文件名为："+Something.getDLLName());            System.out.println("调用的方法名为："+Something.getFunctionName()); //传值            Something.invoke();//调用方法            return Something.getRetVal();        }finally{            if(Something!=null){               Something.dispose();//释放            }        }     }     public Pointer creatPointer() throws NativeException{        pointer = new Pointer(MemoryBlockFactory.createMemoryBlock(36));        pointer.setIntAt(0, 36);        return pointer;     }     public static void main(String[] args) throws NativeException, IllegalAccessException {        UserCall uc = new UserCall();        String result = uc.getSomething("0FFFFF", uc.creatPointer(), 100);        System.err.println("转换成功的字节数为："+result);        TestCallback.runIt();     } }