Java调用c++动态链接库用的 JNI转换接口

xxx.h
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_company_base_GPSEncode */
#ifndef _Included_com_company_base_GPSEncode
#define _Included_com_company_base_GPSEncode
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_fleety_base_GPSEncode
 * Method:    encode
 * Signature: (DD[D)Z
 */
JNIEXPORT jboolean JNICALL Java_com_company_base_GPSEncode_encode
  (JNIEnv *, jclass, jdouble, jdouble, jdoubleArray);
/*
 * Class:     com_fleety_base_GPSDecode
 * Method:    decode
 * Signature: (DD[D)Z
 */
JNIEXPORT jboolean JNICALL Java_com_company_base_GPSEncode_decode
  (JNIEnv *, jclass, jdouble, jdouble, jdoubleArray);
#ifdef __cplusplus
}
#endif
#endif
xxx.cpp
#include "stdafx.h"
#include <stdio.h>  
#include "xxx.h"
#include "DataLib.h"
 
JNIEXPORT jboolean JNICALL Java_com_company_base_GPSEncode_encode
  (JNIEnv* env, jclass cls, jdouble lo, jdouble la, jdoubleArray jResultArr)
{
 //   printf("test encode!\n");
 double loOut = 0;
    double laOut = 0;
 bool bResult = encode(lo,la,loOut,laOut);
 if(bResult)
 {
  env->SetDoubleArrayRegion(jResultArr,0,1,&loOut);
  env->SetDoubleArrayRegion(jResultArr,1,1,&laOut);
 }
    return bResult; 
}
JNIEXPORT jboolean JNICALL Java_com_company_base_GPSEncode_decode
  (JNIEnv* env, jclass cls, jdouble lo, jdouble la, jdoubleArray jResultArr)
{
 //   printf("test decode!\n");
 double loOut = 0;
    double laOut = 0;
 bool bResult = decode(lo,la,loOut,laOut);
 if(bResult)
 {
  env->SetDoubleArrayRegion(jResultArr,0,1,&loOut);
  env->SetDoubleArrayRegion(jResultArr,1,1,&laOut);