class  Cls { 

      native   double  f( int  i, String s); 

      static  { 

         System.loadLibrary(“pkg_Cls.dll”); 

     } 

} 

 class  Cls { 

      native   double  f( int  i, String s); 

      static  { 

         System.loadLibrary(“pkg_Cls.dll”); 

     } 

} 

typedef void * HANDLE;
typedef long DWORD;
typedef struct {...} SECURITY_ATTRIBUTES;
HANDLE CreateFile(
    const char *fileName,       // file name
    DWORD desiredAccess,        // access (read-write) mode
    DWORD shareMode,            // share mode
    SECURITY_ATTRIBUTES *attrs, // security attributes
    DWORD creationDistribution, // how to create
    DWORD flagsAndAttributes,   // file attributes
    HANDLE templateFile         // file with attr. to copy
);

 public   class  Win32 {
     public   static   native   int  CreateFile(
        String fileName,          // file name
         int  desiredAccess,        // access (read-write) mode
         int  shareMode,            // share mode
         int [] secAttrs,           // security attributes
         int  creationDistribution, // how to create
         int  flagsAndAttributes,   // file attributes
         int  templateFile);        // file with attr. to copy
    ...
}

JNIEXPORT jint JNICALL Java_Win32_CreateFile(
        JNIEnv *env,
        jclass cls,
        jstring  fileName,         // file name
	jint desiredAccess, // access (read-write) mode
        jint shareMode,            // share mode
        jintArray secAttrs,        // security attributes
        jint creationDistribution, // how to create
        jint flagsAndAttributes,   // file attributes
        jint templateFile)         // file with attr. to copy
{
    jint result =  0 ;
    jint *cSecAttrs = NULL;
    if (secAttrs) {
        cSecAttrs = env->GetIntArrayElements(secAttrs,  0 );
        if (cSecAttrs == NULL) {
            return  0 ; /* out of memory */
        }


    char *cFileName = JNU_GetStringNativeChars(env, fileName);
    if (cFileName) {
        /* call the real Win32 function */
        result = (jint)CreateFile(cFileName,
                       desiredAccess,
                       shareMode,
                       (SECURITY_ATTRIBUTES *)cSecAttrs,
                       creationDistribution,
                       flagsAndAttributes,
                       (HANDLE)templateFile);
        free(cFileName);
    }
    /* else fall through, out of memory exception thrown */
    if (secAttrs) {
        env->ReleaseIntArrayElements(secAttrs, cSecAttrs,  0 );
    }
    return result;
}

typedef struct
{
        DWORDU[ 3 ];
        WORD A;
        BYTE S;
        BYTE Reserv;
}JNITUID

 public   class   Native  {

     public   native   int  SearchDevices(String[] DeviceName,  int  DeviceCount);

     public   native   int  InitDevice(String DeviceName);

     public   native   void  ReleaseDevice();

}

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class Native */

#ifndef _Included_Native
#define _Included_Native
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     Native
 * Method:    SearchDevices
 * Signature: ([Ljava/lang/String;I)I
 */
JNIEXPORT jint JNICALL Java_Native_SearchDevices
  (JNIEnv *, jobject, jobjectArray, jint);

/*
 * Class:     Native
 * Method:    InitDevice
 * Signature: (Ljava/lang/String;)I
 */
JNIEXPORT jint JNICALL Java_Native_InitDevice
  (JNIEnv *, jobject, jstring);

/*
 * Class:     Native
 * Method:    ReleaseDevice
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_Native_ReleaseDevice
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

 public   class  TUID {
    
     /**
     * Pointer to native TUID instance
     */
     private   long  tuidPoinger; //32-bit pointer to native structure

     public  TUID() {
         this .tuidPoinger = init();
    }

     public   native   int [] getU();

     public   native   void  setU( int [] u);

     public   native   int  getA();

     public   native   void  setA( int  a);

     public   native   byte  getS();

     public   native   void  setS( byte  s);

     public   native   byte  getReserv();

     public   native   void  setReserv( byte  reserv);

    /**
     * to allocate native TUID
     *
     * @return native TUID pointer
     */
     private   native   long  init();

    /**
     * to destroy native TUID
     */
     private   native   void  destroy();

     protected   void  finalize()  throws  Throwable {
        destroy();
         super .finalize();
    }
}

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class TUID */

#ifndef _Included_TUID
#define _Included_TUID
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     TUID
 * Method:    getU
 * Signature: ()[I
 */
JNIEXPORT jintArray JNICALL Java_TUID_getU
  (JNIEnv *, jobject);

/*
 * Class:     TUID
 * Method:    setU
 * Signature: ([I)V
 */
JNIEXPORT void JNICALL Java_TUID_setU
  (JNIEnv *, jobject, jintArray);

/*
 * Class:     TUID
 * Method:    getA
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_TUID_getA
  (JNIEnv *, jobject);

/*
 * Class:     TUID
 * Method:    setA
 * Signature: (I)V
 */
JNIEXPORT void JNICALL Java_TUID_setA
  (JNIEnv *, jobject, jint);

/*
 * Class:     TUID
 * Method:    getS
 * Signature: ()B
 */
JNIEXPORT jbyte JNICALL Java_TUID_getS
  (JNIEnv *, jobject);

/*
 * Class:     TUID
 * Method:    setS
 * Signature: (B)V
 */
JNIEXPORT void JNICALL Java_TUID_setS
  (JNIEnv *, jobject, jbyte);

/*
 * Class:     TUID
 * Method:    getReserv
 * Signature: ()B
 */
JNIEXPORT jbyte JNICALL Java_TUID_getReserv
  (JNIEnv *, jobject);

/*
 * Class:     TUID
 * Method:    setReserv
 * Signature: (B)V
 */
JNIEXPORT void JNICALL Java_TUID_setReserv
  (JNIEnv *, jobject, jbyte);

/*
 * Class:     TUID
 * Method:    init
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_TUID_init
  (JNIEnv *, jobject);

/*
 * Class:     TUID
 * Method:    destroy
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_TUID_destroy
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

#include "TUID.h"

JNIEXPORT jint JNICALL Java_TUID_getA(JNIEnv * env, jobject this){
          jclass cls = (*env)->GetObjectClass(env, this);
	  jfieldID fid = (*env)->GetFieldID(env, cls, "tuidPoinger", "J");
	  TUID * pTUID; 
	jint p = (*env)->GetLongField(env,this, fid);
	pTUID =(TUID *) p;
	  return (jint)pTUID->A;
}


JNIEXPORT jlong JNICALL Java_TUID_init(JNIEnv * env, jobject this){
	  TUID * pTUID = (TUID *)malloc(sizeof(struct TUID));
	  return (jint)pTUID;
}

и так для остальных методов