JIN与c类型转换
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#include <jni.h>
#include "com_test_Test.h"
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
//获取字符串
JNIEXPORT void JNICALL Java_com_test_Test_sayHello(JNIEnv * env, jobject obj,
jstring s) {
char * str = (char *) (*env)->GetStringUTFChars(env, s, 0);
printf("\n c-string: hello - %s", str);
}
//获取，返回int
JNIEXPORT jint JNICALL Java_com_test_Test_add(JNIEnv * env, jobject obj,
jint a, jint b) {
int i = a;
int j = b;
printf("\n c-int: %d - %d", i, j);
char str[256];
sprintf(str, "%d", i + j);
return (jint) i + j;
}
//获取，返回float
JNIEXPORT jfloat JNICALL Java_com_test_Test_getFloat(JNIEnv * env, jobject obj,
jfloat f) {
float fl = f;
printf("\n c-float: %3f", fl);
fl = 200.555;
return (jfloat) fl;
}
//获取，返回 double
JNIEXPORT jdouble JNICALL Java_com_test_Test_getDouble(JNIEnv * env,
jobject obj, jdouble dou) {
double d = dou;
printf("\n c-double: %3f", d);
d = 800.88;
return (jdouble) d;
}
//获取，返回boolean
JNIEXPORT jboolean JNICALL Java_com_test_Test_getBoolean(JNIEnv * env,
jobject obj, jboolean bool) {
unsigned char b = bool;
printf("\n c-boolean: %lu ", b);
if (b) {
printf("true");
} else {
printf("false");
}
b = 1;
return (jboolean) b;
}
//获取，返回 string
JNIEXPORT jstring JNICALL Java_com_test_Test_getString(JNIEnv * env,
jobject obj, jstring s) {
char * st = (char *) (*env)->GetStringUTFChars(env, s, 0);
printf("\n c-string: %s", st);
char * str = "hello wang wu!";
jstring rtn;
rtn = (*env)->NewStringUTF(env, str);
return rtn;
}
//获取，返回 string []
JNIEXPORT jobjectArray JNICALL Java_com_test_Test_getStringArray(JNIEnv * env,
jobject obj, jobjectArray arr) {
int len = (*env)->GetArrayLength(env, arr);
printf("\n c-stringArray :");
int i = 0;
for (i = 0; i < len; i++) {
jobject obj = (*env)->GetObjectArrayElement(env, arr, i);
jstring str = (jstring) obj;
const char * szStr = (*env)->GetStringUTFChars(env, str, 0);
printf(" %d-%s ", i, szStr);
(*env)->ReleaseStringChars(env, str, szStr);
}
//-----返回----
jstring str;
jobjectArray args = 0;
jsize size = 5;
char* sa[] = { "Hello,", "world!", "zhang", "san", "yuang" };
int j = 0;
jclass objClass = (*env)->FindClass(env, "java/lang/String");
args = (*env)->NewObjectArray(env, size, objClass, 0);
for (j = 0; j < size; j++) {
str = (*env)->NewStringUTF(env, sa[j]);
(*env)->SetObjectArrayElement(env, args, j, str);
}
return args;
}
#include <jni.h>
#include "com_test_Test.h"
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include "com_test_Test.h"
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
//获取字符串
JNIEXPORT void JNICALL Java_com_test_Test_sayHello(JNIEnv * env, jobject obj,
jstring s) {
char * str = (char *) (*env)->GetStringUTFChars(env, s, 0);
printf("\n c-string: hello - %s", str);
}
//获取，返回int
JNIEXPORT jint JNICALL Java_com_test_Test_add(JNIEnv * env, jobject obj,
jint a, jint b) {
int i = a;
int j = b;
printf("\n c-int: %d - %d", i, j);
char str[256];
sprintf(str, "%d", i + j);
return (jint) i + j;
}
//获取，返回float
JNIEXPORT jfloat JNICALL Java_com_test_Test_getFloat(JNIEnv * env, jobject obj,
jfloat f) {
float fl = f;
printf("\n c-float: %3f", fl);
fl = 200.555;
return (jfloat) fl;
}
//获取，返回 double
JNIEXPORT jdouble JNICALL Java_com_test_Test_getDouble(JNIEnv * env,
jobject obj, jdouble dou) {
double d = dou;
printf("\n c-double: %3f", d);
d = 800.88;
return (jdouble) d;
}
//获取，返回boolean
JNIEXPORT jboolean JNICALL Java_com_test_Test_getBoolean(JNIEnv * env,
jobject obj, jboolean bool) {
unsigned char b = bool;
printf("\n c-boolean: %lu ", b);
if (b) {
printf("true");
} else {
printf("false");
}
b = 1;
return (jboolean) b;
}
//获取，返回 string
JNIEXPORT jstring JNICALL Java_com_test_Test_getString(JNIEnv * env,
jobject obj, jstring s) {
char * st = (char *) (*env)->GetStringUTFChars(env, s, 0);
printf("\n c-string: %s", st);
char * str = "hello wang wu!";
jstring rtn;
rtn = (*env)->NewStringUTF(env, str);
return rtn;
}
//获取，返回 string []
JNIEXPORT jobjectArray JNICALL Java_com_test_Test_getStringArray(JNIEnv * env,
jobject obj, jobjectArray arr) {
int len = (*env)->GetArrayLength(env, arr);
printf("\n c-stringArray :");
int i = 0;
for (i = 0; i < len; i++) {
jobject obj = (*env)->GetObjectArrayElement(env, arr, i);
jstring str = (jstring) obj;
const char * szStr = (*env)->GetStringUTFChars(env, str, 0);
printf(" %d-%s ", i, szStr);
(*env)->ReleaseStringChars(env, str, szStr);
}
//-----返回----
jstring str;
jobjectArray args = 0;
jsize size = 5;
char* sa[] = { "Hello,", "world!", "zhang", "san", "yuang" };
int j = 0;
jclass objClass = (*env)->FindClass(env, "java/lang/String");
args = (*env)->NewObjectArray(env, size, objClass, 0);
for (j = 0; j < size; j++) {
str = (*env)->NewStringUTF(env, sa[j]);
(*env)->SetObjectArrayElement(env, args, j, str);
}
return args;
}
#include <jni.h>
#include "com_test_Test.h"
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
//获取字符串
JNIEXPORT void JNICALL Java_com_test_Test_sayHello(JNIEnv * env, jobject obj,
jstring s) {
JNIEXPORT void JNICALL Java_com_test_Test_sayHello(JNIEnv * env, jobject obj,
jstring s) {
char * str = (char *) (*env)->GetStringUTFChars(env, s, 0);
printf("\n c-string: hello - %s", str);
printf("\n c-string: hello - %s", str);
}
//获取，返回int
JNIEXPORT jint JNICALL Java_com_test_Test_add(JNIEnv * env, jobject obj,
jint a, jint b) {
int i = a;
int j = b;
printf("\n c-int: %d - %d", i, j);
char str[256];
sprintf(str, "%d", i + j);
return (jint) i + j;
}
JNIEXPORT jint JNICALL Java_com_test_Test_add(JNIEnv * env, jobject obj,
jint a, jint b) {
int i = a;
int j = b;
printf("\n c-int: %d - %d", i, j);
char str[256];
sprintf(str, "%d", i + j);
return (jint) i + j;
}
//获取，返回float
JNIEXPORT jfloat JNICALL Java_com_test_Test_getFloat(JNIEnv * env, jobject obj,
jfloat f) {
float fl = f;
printf("\n c-float: %3f", fl);
JNIEXPORT jfloat JNICALL Java_com_test_Test_getFloat(JNIEnv * env, jobject obj,
jfloat f) {
float fl = f;
printf("\n c-float: %3f", fl);
fl = 200.555;
return (jfloat) fl;
}
return (jfloat) fl;
}
//获取，返回 double
JNIEXPORT jdouble JNICALL Java_com_test_Test_getDouble(JNIEnv * env,
jobject obj, jdouble dou) {
double d = dou;
printf("\n c-double: %3f", d);
JNIEXPORT jdouble JNICALL Java_com_test_Test_getDouble(JNIEnv * env,
jobject obj, jdouble dou) {
double d = dou;
printf("\n c-double: %3f", d);
d = 800.88;
return (jdouble) d;
}
return (jdouble) d;
}
//获取，返回boolean
JNIEXPORT jboolean JNICALL Java_com_test_Test_getBoolean(JNIEnv * env,
jobject obj, jboolean bool) {
JNIEXPORT jboolean JNICALL Java_com_test_Test_getBoolean(JNIEnv * env,
jobject obj, jboolean bool) {
unsigned char b = bool;
printf("\n c-boolean: %lu ", b);
if (b) {
printf("true");
} else {
printf("false");
}
printf("\n c-boolean: %lu ", b);
if (b) {
printf("true");
} else {
printf("false");
}
b = 1;
return (jboolean) b;
}
return (jboolean) b;
}
//获取，返回 string
JNIEXPORT jstring JNICALL Java_com_test_Test_getString(JNIEnv * env,
jobject obj, jstring s) {
char * st = (char *) (*env)->GetStringUTFChars(env, s, 0);
printf("\n c-string: %s", st);
JNIEXPORT jstring JNICALL Java_com_test_Test_getString(JNIEnv * env,
jobject obj, jstring s) {
char * st = (char *) (*env)->GetStringUTFChars(env, s, 0);
printf("\n c-string: %s", st);
char * str = "hello wang wu!";
jstring rtn;
rtn = (*env)->NewStringUTF(env, str);
return rtn;
}
jstring rtn;
rtn = (*env)->NewStringUTF(env, str);
return rtn;
}
//获取，返回 string []
JNIEXPORT jobjectArray JNICALL Java_com_test_Test_getStringArray(JNIEnv * env,
jobject obj, jobjectArray arr) {
int len = (*env)->GetArrayLength(env, arr);
printf("\n c-stringArray :");
int i = 0;
for (i = 0; i < len; i++) {
jobject obj = (*env)->GetObjectArrayElement(env, arr, i);
jstring str = (jstring) obj;
const char * szStr = (*env)->GetStringUTFChars(env, str, 0);
printf(" %d-%s ", i, szStr);
(*env)->ReleaseStringChars(env, str, szStr);
}
//-----返回----
JNIEXPORT jobjectArray JNICALL Java_com_test_Test_getStringArray(JNIEnv * env,
jobject obj, jobjectArray arr) {
int len = (*env)->GetArrayLength(env, arr);
printf("\n c-stringArray :");
int i = 0;
for (i = 0; i < len; i++) {
jobject obj = (*env)->GetObjectArrayElement(env, arr, i);
jstring str = (jstring) obj;
const char * szStr = (*env)->GetStringUTFChars(env, str, 0);
printf(" %d-%s ", i, szStr);
(*env)->ReleaseStringChars(env, str, szStr);
}
//-----返回----
jstring str;
jobjectArray args = 0;
jsize size = 5;
char* sa[] = { "Hello,", "world!", "zhang", "san", "yuang" };
int j = 0;
jclass objClass = (*env)->FindClass(env, "java/lang/String");
args = (*env)->NewObjectArray(env, size, objClass, 0);
for (j = 0; j < size; j++) {
str = (*env)->NewStringUTF(env, sa[j]);
(*env)->SetObjectArrayElement(env, args, j, str);
}
return args;
}
jobjectArray args = 0;
jsize size = 5;
char* sa[] = { "Hello,", "world!", "zhang", "san", "yuang" };
int j = 0;
jclass objClass = (*env)->FindClass(env, "java/lang/String");
args = (*env)->NewObjectArray(env, size, objClass, 0);
for (j = 0; j < size; j++) {
str = (*env)->NewStringUTF(env, sa[j]);
(*env)->SetObjectArrayElement(env, args, j, str);
}
return args;
}
下面是Test.java
Java代码
package com.test;
public class Test {
private native void sayHello(String str);
private native int add(int a, int b);
private native float getFloat(float f);
private native double getDouble(double d);
private native boolean getBoolean(boolean b);
private native String getString(String str);
private native String[] getStringArray(String[] sa);
static {
System.loadLibrary("Test");
}
public static void main(String[] args) {
Test test = new Test();
test.sayHello("zhang san");
System.out.println("int --> " + test.add(10, 20));
System.out.println("float --> " + test.getFloat((float) 20.123));
System.out.println("double --> " + test.getDouble(100.369));
System.out.println("boolean --> " + test.getBoolean(true));
System.out.println("string --> " + test.getString("wang Wu"));
String[] ss = { "hello", "-", "zhang", "san" };
Object[] obj = test.getStringArray(ss);
System.out.print("string[]--> ");
for (Object object : obj) {
System.out.print(object + " ");
}
}
}
package com.test;
package com.test;
public class Test {
private native void sayHello(String str);
private native int add(int a, int b);
private native float getFloat(float f);
private native double getDouble(double d);
private native boolean getBoolean(boolean b);
private native String getString(String str);
private native String[] getStringArray(String[] sa);
static {
System.loadLibrary("Test");
}
public static void main(String[] args) {
Test test = new Test();
test.sayHello("zhang san");
System.out.println("int --> " + test.add(10, 20));
System.out.println("float --> " + test.getFloat((float) 20.123));
System.out.println("double --> " + test.getDouble(100.369));
System.out.println("boolean --> " + test.getBoolean(true));
System.out.println("string --> " + test.getString("wang Wu"));
String[] ss = { "hello", "-", "zhang", "san" };
Object[] obj = test.getStringArray(ss);
System.out.print("string[]--> ");
for (Object object : obj) {
System.out.print(object + " ");
}
}
}
package com.test;
public class Test {
private native void sayHello(String str);
private native void sayHello(String str);
private native int add(int a, int b);
private native float getFloat(float f);
private native double getDouble(double d);
private native boolean getBoolean(boolean b);
private native String getString(String str);
private native String[] getStringArray(String[] sa);
static {
System.loadLibrary("Test");
}
System.loadLibrary("Test");
}
public static void main(String[] args) {
Test test = new Test();
test.sayHello("zhang san");
System.out.println("int --> " + test.add(10, 20));
System.out.println("float --> " + test.getFloat((float) 20.123));
System.out.println("double --> " + test.getDouble(100.369));
System.out.println("boolean --> " + test.getBoolean(true));
System.out.println("string --> " + test.getString("wang Wu"));
Test test = new Test();
test.sayHello("zhang san");
System.out.println("int --> " + test.add(10, 20));
System.out.println("float --> " + test.getFloat((float) 20.123));
System.out.println("double --> " + test.getDouble(100.369));
System.out.println("boolean --> " + test.getBoolean(true));
System.out.println("string --> " + test.getString("wang Wu"));
String[] ss = { "hello", "-", "zhang", "san" };
Object[] obj = test.getStringArray(ss);
System.out.print("string[]--> ");
for (Object object : obj) {
System.out.print(object + " ");
}
Object[] obj = test.getStringArray(ss);
System.out.print("string[]--> ");
for (Object object : obj) {
System.out.print(object + " ");
}
}
}
++++++++++++++++++++++++++++++++++++++++++++++++++
上面类型转换没有一个一个去试，应该都是可以的
++++++++++++++++++++++++++++++++++++++++++++++++++
2：JNI 乱码解决方案
顺便再转一个JNI相关的：jni乱码解决方案
http://www.wangchao.net.cn/bbsdetail_57022.html
http://www.wangchao.net.cn/bbsdetail_57022.html
Java代码：
Java代码
/*
* javactransfer.java
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
public class javactransfer
{
public String hypotenuse(String send_buf,String recv_buf,int errno)
{
return hypotenuse0(send_buf,recv_buf,errno);
}
private native String hypotenuse0(String send_buf,String recv_buf,int errno);
static
{
System.loadLibrary("javactransfer");//调用dll
}
public static void main( String[] args )
{
javactransfer obj= new javactransfer();
System.out.println("");
System.out.println("");
System.out.println(" begin!");
System.out.println("");
System.out.println("");
String javasend="发送中文chinese!";
System.out.println(" java send:"+"["+javasend+"]");
String javarecv=obj.hypotenuse("teststr",javasend,1);
//javasend传含有中文字符串给C
//javarecv接受C含有中的文字符串
System.out.println(" java recv:"+"["+javarecv+"]");
System.out.println("");
System.out.println("");
System.out.println(" end!");
}
}
/*
* javactransfer.java
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
public class javactransfer
{
public String hypotenuse(String send_buf,String recv_buf,int errno)
{
return hypotenuse0(send_buf,recv_buf,errno);
}
private native String hypotenuse0(String send_buf,String recv_buf,int errno);
static
{
System.loadLibrary("javactransfer");//调用dll
}
public static void main( String[] args )
{
javactransfer obj= new javactransfer();
System.out.println("");
System.out.println("");
System.out.println(" begin!");
System.out.println("");
System.out.println("");
String javasend="发送中文chinese!";
System.out.println(" java send:"+"["+javasend+"]");
String javarecv=obj.hypotenuse("teststr",javasend,1);
//javasend传含有中文字符串给C
//javarecv接受C含有中的文字符串
System.out.println(" java recv:"+"["+javarecv+"]");
System.out.println("");
System.out.println("");
System.out.println(" end!");
}
}
/*
* javactransfer.java
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
public class javactransfer
{
public String hypotenuse(String send_buf,String recv_buf,int errno)
{
return hypotenuse0(send_buf,recv_buf,errno);
}
private native String hypotenuse0(String send_buf,String recv_buf,int errno);
static
{
System.loadLibrary("javactransfer");//调用dll
}
public static void main( String[] args )
{
javactransfer obj= new javactransfer();
System.out.println("");
System.out.println("");
System.out.println(" begin!");
System.out.println("");
System.out.println("");
String javasend="发送中文chinese!";
System.out.println(" java send:"+"["+javasend+"]");
String javarecv=obj.hypotenuse("teststr",javasend,1);
//javasend传含有中文字符串给C
//javarecv接受C含有中的文字符串
System.out.println(" java recv:"+"["+javarecv+"]");
System.out.println("");
System.out.println("");
System.out.println(" end!");
}
}
/*
* javactransfer.java
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
public class javactransfer
{
public String hypotenuse(String send_buf,String recv_buf,int errno)
{
return hypotenuse0(send_buf,recv_buf,errno);
}
private native String hypotenuse0(String send_buf,String recv_buf,int errno);
static
{
System.loadLibrary("javactransfer");//调用dll
}
public static void main( String[] args )
{
javactransfer obj= new javactransfer();
System.out.println("");
System.out.println("");
System.out.println(" begin!");
System.out.println("");
System.out.println("");
String javasend="发送中文chinese!";
System.out.println(" java send:"+"["+javasend+"]");
String javarecv=obj.hypotenuse("teststr",javasend,1);
//javasend传含有中文字符串给C
//javarecv接受C含有中的文字符串
System.out.println(" java recv:"+"["+javarecv+"]");
System.out.println("");
System.out.println("");
System.out.println(" end!");
}
}
C实现代码为：
C代码
/*
* javactransfer.c
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
#include <windows.h>
#include "javactransfer.h"//通过javah –jni javactransfer 生成
#include <stdio.h>
#include "stdlib.h"
#include "string.h"
char* jstringToWindows( JNIEnv *env, jstring jstr );
jstring WindowsTojstring( JNIEnv* env, char* str );
JNIEXPORT jstring JNICALL
Java_javactransfer_hypotenuse0(JNIEnv *env,jobject obj,jstring send_buf,jstring recv_buf,jint errno)
{
char * Buf_Return;
Buf_Return = (char*)malloc(1024);
const char * recvtest = jstringToWindows( env, recv_buf );
/*上句recvtest接收Java传过来的中文字符串正确,如果改为下句,则出现乱码:
const char * recvtest = (*env)->GetStringUTFChars( env,recv_buf,0);
*/
printf( " c recv :[%s]\n" , recvtest);
sprintf(Buf_Return,"接收中文chinese!");
printf( "\n\n\n c send :[%s]\n" , Buf_Return);
recv_buf = WindowsTojstring(env ,Buf_Return);
/*上句recv_buf传windows本地C中含有中文字符串给Java正确;如果改为下句出现乱码:
recv_buf = (*env)->NewStringUTF( env, Buf_Return );
*/
return recv_buf;
}
char* jstringToWindows( JNIEnv *env, jstring jstr )
{
int length = (*env)->GetStringLength(env,jstr );
const jchar* jcstr = (*env)->GetStringChars(env,jstr, 0 );
char* rtn = (char*)malloc( length*2+1 );
int size = 0;
size = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)jcstr, length, rtn,(length*2+1), NULL, NULL );
if( size <= 0 )
return NULL;
(*env)->ReleaseStringChars(env,jstr, jcstr );
rtn[size] = 0;
return rtn;
}
jstring WindowsTojstring( JNIEnv* env, char* str )
{
jstring rtn = 0;
int slen = strlen(str);
unsigned short* buffer = 0;
if( slen == 0 )
rtn = (*env)->NewStringUTF(env,str );
else
{
int length = MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0 );
buffer = malloc( length*2 + 1 );
if( MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer, length ) >0 )
rtn = (*env)->NewString( env, (jchar*)buffer, length );
}
if( buffer )
free( buffer );
return rtn;
}
/*
* javactransfer.c
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
#include <windows.h>
#include "javactransfer.h"//通过javah –jni javactransfer 生成
#include <stdio.h>
#include "stdlib.h"
#include "string.h"
char* jstringToWindows( JNIEnv *env, jstring jstr );
jstring WindowsTojstring( JNIEnv* env, char* str );
JNIEXPORT jstring JNICALL
Java_javactransfer_hypotenuse0(JNIEnv *env,jobject obj,jstring send_buf,jstring recv_buf,jint errno)
{
char * Buf_Return;
Buf_Return = (char*)malloc(1024);
const char * recvtest = jstringToWindows( env, recv_buf );
/*上句recvtest接收Java传过来的中文字符串正确,如果改为下句,则出现乱码:
const char * recvtest = (*env)->GetStringUTFChars( env,recv_buf,0);
*/
printf( " c recv :[%s]\n" , recvtest);
sprintf(Buf_Return,"接收中文chinese!");
printf( "\n\n\n c send :[%s]\n" , Buf_Return);
recv_buf = WindowsTojstring(env ,Buf_Return);
/*上句recv_buf传windows本地C中含有中文字符串给Java正确;如果改为下句出现乱码:
recv_buf = (*env)->NewStringUTF( env, Buf_Return );
*/
return recv_buf;
}
char* jstringToWindows( JNIEnv *env, jstring jstr )
{
int length = (*env)->GetStringLength(env,jstr );
const jchar* jcstr = (*env)->GetStringChars(env,jstr, 0 );
char* rtn = (char*)malloc( length*2+1 );
int size = 0;
size = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)jcstr, length, rtn,(length*2+1), NULL, NULL );
if( size <= 0 )
return NULL;
(*env)->ReleaseStringChars(env,jstr, jcstr );
rtn[size] = 0;
return rtn;
}
jstring WindowsTojstring( JNIEnv* env, char* str )
{
jstring rtn = 0;
int slen = strlen(str);
unsigned short* buffer = 0;
if( slen == 0 )
rtn = (*env)->NewStringUTF(env,str );
else
{
int length = MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0 );
buffer = malloc( length*2 + 1 );
if( MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer, length ) >0 )
rtn = (*env)->NewString( env, (jchar*)buffer, length );
}
if( buffer )
free( buffer );
return rtn;
}
C++实现代码为:
C++代码
/*
* javactransfer.cpp
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
#include <windows.h>
#include "javactransfer.h"//通过javah –jni javactransfer 生成
#include <stdio.h>
#include "stdlib.h"
#include "string.h"
char* jstringToWindows( JNIEnv *env, jstring jstr );
jstring WindowsTojstring( JNIEnv* env, char* str );
JNIEXPORT jstring JNICALL
Java_javactransfer_hypotenuse0(JNIEnv *env,jobject obj,jstring send_buf,jstring recv_buf,jint _tperrno)
{
char * Buf_Return;
Buf_Return = (char*)malloc(1024);
const char * ctest = jstringToWindows( env, recv_buf );
/*
如果把上句改为下句，C接收Java字符串时将出现乱码：
const char *ctest = (env)->GetStringUTFChars( recv_buf , 0);
*/
printf( " c recv :[%s]\n" , ctest);
sprintf(Buf_Return,"接收中文chinese!");
printf( "\n\n\n c send :[%s]\n" , Buf_Return);
recv_buf = WindowsTojstring(env ,Buf_Return);
/*上句执行正确,如果把上句换成下句,Java在接收C字符串时出现乱码
recv_buf = (env)->NewStringUTF(Buf_Return);
*/
return recv_buf;
}
char* jstringToWindows( JNIEnv *env, jstring jstr )
{
int length = (env)->GetStringLength(jstr );
const jchar* jcstr = (env)->GetStringChars(jstr, 0 );
char* rtn = (char*)malloc( length*2+1 );
int size = 0;
size = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)jcstr, length, rtn,(length*2+1), NULL, NULL );
if( size <= 0 )
return NULL;
(env)->ReleaseStringChars(jstr, jcstr );
rtn[size] = 0;
return rtn;
}
jstring WindowsTojstring( JNIEnv* env, char* str )
{
jstring rtn = 0;
int slen = strlen(str);
unsigned short * buffer = 0;
if( slen == 0 )
rtn = (env)->NewStringUTF(str );
else
{
int length = MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0 );
buffer = (unsigned short *)malloc( length*2 + 1 );
if( MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer, length ) >0 )
rtn = (env)->NewString( (jchar*)buffer, length );
}
if( buffer )
free( buffer );
return rtn;
}
/*
* javactransfer.cpp
* By dpwu
* e-mail：dpwu_js@sina.com.cn
*/
#include <windows.h>
#include "javactransfer.h"//通过javah –jni javactransfer 生成
#include <stdio.h>
#include "stdlib.h"
#include "string.h"
char* jstringToWindows( JNIEnv *env, jstring jstr );
jstring WindowsTojstring( JNIEnv* env, char* str );
JNIEXPORT jstring JNICALL
Java_javactransfer_hypotenuse0(JNIEnv *env,jobject obj,jstring send_buf,jstring recv_buf,jint _tperrno)
{
char * Buf_Return;
Buf_Return = (char*)malloc(1024);
const char * ctest = jstringToWindows( env, recv_buf );
/*
如果把上句改为下句，C接收Java字符串时将出现乱码：
const char *ctest = (env)->GetStringUTFChars( recv_buf , 0);
*/
printf( " c recv :[%s]\n" , ctest);
sprintf(Buf_Return,"接收中文chinese!");
printf( "\n\n\n c send :[%s]\n" , Buf_Return);
recv_buf = WindowsTojstring(env ,Buf_Return);
/*上句执行正确,如果把上句换成下句,Java在接收C字符串时出现乱码
recv_buf = (env)->NewStringUTF(Buf_Return);
*/
return recv_buf;
}
char* jstringToWindows( JNIEnv *env, jstring jstr )
{
int length = (env)->GetStringLength(jstr );
const jchar* jcstr = (env)->GetStringChars(jstr, 0 );
char* rtn = (char*)malloc( length*2+1 );
int size = 0;
size = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)jcstr, length, rtn,(length*2+1), NULL, NULL );
if( size <= 0 )
return NULL;
(env)->ReleaseStringChars(jstr, jcstr );
rtn[size] = 0;
return rtn;
}
jstring WindowsTojstring( JNIEnv* env, char* str )
{
jstring rtn = 0;
int slen = strlen(str);
unsigned short * buffer = 0;
if( slen == 0 )
rtn = (env)->NewStringUTF(str );
else
{
int length = MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0 );
buffer = (unsigned short *)malloc( length*2 + 1 );
if( MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer, length ) >0 )
rtn = (env)->NewString( (jchar*)buffer, length );
}
if( buffer )
free( buffer );
return rtn;
}
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