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<DIV class=postTitle><A class=postTitle2 id=AjaxHolder_ctl01_TitleUrl
href="http://www.cnblogs.com/rookieport/archive/2005/10/18/257154.html">Java与C\C++之间通过JNI传递中文字符串</A>
</DIV>Java与C之间通过JNI传递中文字符串<BR>简介
<BR>本文提供一个具体的实例,说明Java和C之间通过JNI传递含有中文字符串的参数,解决中文乱码问题（双字节或多字节乱码）。本文给出具体的源代码，对源代码进行了解释，C部分提供了
C和C++两种方式实现的完整代码。并且所有代码均在实验环境下测试通过。本文读者须对Java和C(或C++)有一定的基础知识。<BR>实验环境<BR>Windows
XP （或Windows2000）<BR>j2sdk1.4.2/j2re1.4.2<BR>Microsoft
VisualC++6.0<BR>安装好j2sdk后需要设置环境变量
<BR>CLASSPATH=.;C:\j2sdk1.4.2\bin;C:\j2sdk1.4.2\lib\dt.jar;C:\j2sdk1.4.2\lib\tools.jar;C:\j2sdk1.4.2\lib\htmlconverter.jar（j2sdk安装在c:\j2sdk1.4.2目录下）<BR>源代码及代码说明<BR>Java代码：<BR>/*<BR>*
javactransfer.java<BR>* By dpwu<BR>* e-mail：<A
href="mailto:dpwu_js@sina.com.cn"><FONT
color=#003366>dpwu_js@sina.com.cn</FONT></A><BR>*/<BR>public class
javactransfer<BR>{<BR> public String hypotenuse(String
send_buf,String recv_buf,int errno)<BR> {<BR> return
hypotenuse0(send_buf,recv_buf,errno);<BR> }<BR><BR> private
native String hypotenuse0(String send_buf,String recv_buf,int
errno);<BR><BR> static<BR> {<BR>
System.loadLibrary("javactransfer");//调用dll<BR> }<BR> public
static void main( String[] args )<BR> {<BR><BR>
javactransfer obj= new javactransfer();<BR>
System.out.println("");<BR>
System.out.println("");<BR>
System.out.println("
begin!");<BR> System.out.println("");<BR>
System.out.println("");<BR> String
javasend="发送中文chinese!";<BR> System.out.println(" java
send:"+"["+javasend+"]");<BR>String
javarecv=obj.hypotenuse("teststr",javasend,1); <BR>//javasend传含有中文字符串给C<BR>//javarecv接受C含有中的文字符串<BR>
System.out.println(" java recv:"+"["+javarecv+"]");<BR>
System.out.println("");<BR>
System.out.println("");<BR>
System.out.println("
end!");<BR>
}<BR>}<BR><BR><BR><BR>C实现代码为：<BR>/*<BR>* javactransfer.c<BR>* By dpwu<BR>*
e-mail：<A href="mailto:dpwu_js@sina.com.cn"><FONT
color=#003366>dpwu_js@sina.com.cn</FONT></A><BR>*/<BR><BR>#include
<WINDOWS.H><BR>#include "javactransfer.h"//通过javah –jni javactransfer
生成<BR>#include <STDIO.H><BR>#include "stdlib.h"<BR>#include
"string.h"<BR><BR>char* jstringToWindows( JNIEnv *env, jstring jstr
);<BR>jstring WindowsTojstring( JNIEnv* env, char* str );<BR><BR>JNIEXPORT
jstring JNICALL <BR>Java_javactransfer_hypotenuse0(JNIEnv *env,jobject
obj,jstring send_buf,jstring recv_buf,jint errno)<BR>{<BR> char *
Buf_Return;<BR><BR> Buf_Return = (char*)malloc(1024);
<BR> <BR> const char * recvtest = jstringToWindows( env,
recv_buf );<BR>/*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:<BR>const char *
recvtest = (*env)->GetStringUTFChars(
env,recv_buf,0); <BR>*/<BR>printf( "
c recv :[%s]\n" ,
recvtest);<BR> <BR> sprintf(Buf_Return,"接收中文chinese!");<BR> printf(
"\n\n\n c send :[%s]\n" , Buf_Return); <BR> recv_buf =
WindowsTojstring(env
,Buf_Return);<BR>/*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:<BR>recv_buf
= (*env)->NewStringUTF( env, Buf_Return
);<BR> */<BR> return recv_buf;<BR>}<BR>char*
jstringToWindows( JNIEnv *env, jstring jstr )<BR>{<BR> int
length = (*env)->GetStringLength(env,jstr );<BR> const jchar*
jcstr = (*env)->GetStringChars(env,jstr, 0 );<BR> char* rtn =
(char*)malloc( length*2+1 );<BR> int size = 0;<BR> size =
WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)jcstr, length, rtn,(length*2+1), NULL,
NULL );<BR> if( size <= 0 )<BR> return
NULL;<BR> (*env)->ReleaseStringChars(env,jstr, jcstr
);<BR> rtn[size] = 0;<BR> return rtn;<BR>}<BR><BR>jstring
WindowsTojstring( JNIEnv* env, char* str )<BR>{<BR> jstring rtn =
0;<BR> int slen = strlen(str);<BR> unsigned short* buffer
= 0;<BR> if( slen == 0 )<BR> rtn =
(*env)->NewStringUTF(env,str );
<BR> else<BR> {<BR> int length =
MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0 );<BR>
buffer = malloc( length*2 + 1 );<BR> if( MultiByteToWideChar(
CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer, length ) >0 )<BR>
rtn = (*env)->NewString( env, (jchar*)buffer, length
);<BR> }<BR> if( buffer )<BR> free( buffer
);<BR> return
rtn;<BR>}<BR>若javactransfer.java,javactransfer.c均放在d:\javac目录下，<BR>然后执行<BR>(此处图片不能上传）<BR><BR>javac
javactransfer.java :编译java源代码;<BR>javah –jni javactransfer :生成头文件;<BR>cl
-Ic:\j2sdk1.4.2\include -Ic:\j2sdk1.4.2\include\win32 -LD
javactransfer.c -Fejavactransfer.dll<BR>通过Microsoft Visual
C++将C源代码生成dll文件，供java调用。<BR>执行结果如下：<BR>（此处图片不能上传）<BR>执行键入：java javactranfer
<BR><BR>C++实现代码为:<BR>/*<BR>* javactransfer.cpp<BR>* By dpwu<BR>* e-mail：<A
href="mailto:dpwu_js@sina.com.cn"><FONT
color=#003366>dpwu_js@sina.com.cn</FONT></A><BR>*/<BR><BR>#include
<WINDOWS.H><BR>#include "javactransfer.h"//通过javah –jni javactransfer
生成<BR>#include <STDIO.H><BR>#include "stdlib.h"<BR>#include
"string.h"<BR><BR>char* jstringToWindows( JNIEnv *env, jstring jstr
);<BR>jstring WindowsTojstring( JNIEnv* env, char* str );<BR><BR>JNIEXPORT
jstring JNICALL <BR>Java_javactransfer_hypotenuse0(JNIEnv *env,jobject
obj,jstring send_buf,jstring recv_buf,jint
_tperrno)<BR><BR>{<BR> char *
Buf_Return;<BR> Buf_Return = (char*)malloc(1024);
<BR><BR> const char * ctest = jstringToWindows( env, recv_buf
);<BR>/*<BR> 如果把上句改为下句，C接收Java字符串时将出现乱码：<BR> const char
*ctest = (env)->GetStringUTFChars( recv_buf ,
0);<BR>*/<BR> printf( " c recv :[%s]\n" ,
ctest);<BR> <BR> sprintf(Buf_Return,"接收中文chinese!");<BR> printf(
"\n\n\n c send :[%s]\n" , Buf_Return); <BR> recv_buf =
WindowsTojstring(env
,Buf_Return);<BR>/*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<BR>recv_buf =
(env)->NewStringUTF(Buf_Return);<BR>*/<BR> return
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