JNI GetStringUTFChars

// GetStringUTFChars.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "..\GetStringUTFChars.h"
JNIEXPORT void JNICALL Java_GetStringUTFChars_modifyString
  (JNIEnv *env , jclass clazz, jstring str, jstring strNew)
{
	jboolean b=false;
	char* oldstr=(char* )env->GetStringUTFChars(str,&b);
	b=true;
    const	char* newchar=env->GetStringUTFChars(strNew,&b);
	strcpy(oldstr,newchar);
}

/*
GetStringUTFChars
const char* GetStringUTFChars
(JNIEnv* env, jstring string, jboolean* isCopy)
*/

class  GetStringUTFChars
{
	native static void modifyString(final String  str,final String  strNew);
	public static void main(String[] args) 
	{
		String str="Hello World!";
		System.out.println(str);
		String strnew="new String!";
		modifyString( str,strnew);
		System.out.println(str);
	}

	static {
		System.loadLibrary("GetStringUTFChars");
	}
}

/*
Hello World!
Hello World!
请按任意键继续. . .
*/

/*
GetStringUTFChars
const char* GetStringUTFChars
(JNIEnv* env, jstring string, jboolean* isCopy)
*/

class  GetStringUTFChars
{
	native static void modifyString(final String  str,final String  strNew);
	public static void main(String[] args) 
	{
		String str="Hello World!";
		System.out.println(str);
		String strnew="new String!";
		modifyString( str,strnew);
		System.out.println(str);
	}

	static {
		System.loadLibrary("GetStringUTFChars");
	}
}

/*
Hello World!
isCopy=true
isCopy=true
Hello World!
请按任意键继续. . .
*/

/*
// GetStringUTFChars.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "..\GetStringUTFChars.h"
#include<iostream>
using namespace std;

JNIEXPORT void JNICALL Java_GetStringUTFChars_modifyString
  (JNIEnv *env , jclass clazz, jstring str, jstring strNew)
{
	jboolean b=false;
	char* oldstr=(char* )env->GetStringUTFChars(str,&b);
	if(b)
		cout<<"isCopy=true"<<endl;
	else
		cout<<"isCopy=false"<<endl;
	b=true;
    const	char* newchar=env->GetStringUTFChars(strNew,&b);
	if(b)
		cout<<"isCopy=true"<<endl;
	else
		cout<<"isCopy=false"<<endl;
	strcpy(oldstr,newchar);
}

*/