📄 java与cc++之间通过jni传递中文字符串 - 爱睇资讯 - 博客园.htm
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recv_buf;<BR>}<BR>char* jstringToWindows( JNIEnv *env, jstring jstr
)<BR>{<BR> int length = (env)->GetStringLength(jstr
);<BR> const jchar* jcstr = (env)->GetStringChars(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(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(str ); <BR> else<BR> {<BR>
int length = MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0
);<BR> buffer = (unsigned short *)malloc( length*2 + 1 );<BR>
if( MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer,
length ) >0 )<BR> rtn =
(env)->NewString( (jchar*)buffer, length
);<BR> }<BR> if( buffer )<BR> free( buffer
);<BR> return rtn;<BR>}<BR>当为C++实现时,只需要在编译时改为：<BR>cl
-Ic:\j2sdk1.4.2\include -Ic:\j2sdk1.4.2\include\win32 -LD javactransfer.cpp
-Fejavactransfer.dll
<BR><BR>后话<BR>本文所述内容可以应用于复杂系统的改造，现有大型生产系统（例如：金融等）很多都是unix+C+tuxedo基于共享内存实现,而这些系统为了满足安全和响应时间要求不可能在短期内完全丢弃,本文中提供的方法,可以和tuxedo客户端通过VC++封装成各种dll,这些dll可以在tuxedo本身很多优良特性的基础上进行基于Java的开发,以用来解决新的基于WEB应用的需求。如有错误之处，请与笔者联系：<A
href="mailto:dpwu_js@sina.com.cn"><FONT
color=#003366>dpwu_js@sina.com.cn</FONT></A>。<BR><BR>参考资料：David Wendt 《NLS
strings and JNI》<BR>WebSphere programmer, IBM<BR><BR><BR>下面是我在这个基础上完成的C++ Call
Java的反向例程：<BR><STRONG>C++传递中文字符给java<BR><BR></STRONG>/*<BR>* Chinese.java<BR>*
By Rookie.Zhang<BR>* e-mail：<A href="mailto:rookieport@msn.com"><FONT
color=#003366>rookieport@msn.com</FONT></A><BR>*/<BR>public class
Chinese<BR>{<BR> private static void sayHello(String
name){<BR>
System.out.println("Hello: " + name);<BR>
}<BR><BR> public static void main(String[]
args){<BR> for(int idx =
0; idx < args.length; idx ++){<BR>
sayHello(args[idx]);<BR>
}<BR>
}<BR>};<BR><BR>/*<BR>* jnidemo.cpp<BR>* By Rookie.Zhang<BR>* e-mail：<A
href="mailto:rookieport@msn.com"><FONT
color=#003366>rookieport@msn.com</FONT></A><BR>*<BR>*/<BR>/*<BR>*
环境：jdk1.5.0_05+vc7+winxp<BR>* Usage:<BR>1。编译<BR>cl -I%JAVA_HOME%\include
-I%JAVA_HOME%\include\win32 jnidemo.cpp /link
%JAVA_HOME%\lib\jvm.lib<BR>2。设置JVM路径<BR>set
path=%JAVA_HOME%\jre\bin\client;%PATH%<BR>3。运行<BR>jnidemo<BR>4. 输出<BR>Hello:
Rookie.张[中文]<BR>*/<BR><BR>#include <WINDOWS.H><BR>#include <JNI.H><BR>#include
<STDLIB.H><BR><BR>jstring WindowsTojstring( JNIEnv* env, char* str );<BR><BR>int
main()<BR>{<BR> JavaVMOption options[1];<BR>
JavaVMInitArgs vm_args;<BR>
JavaVM *jvm;<BR> JNIEnv *env;<BR>
long status;<BR><BR> jclass
class_Chinese;<BR> jclass class_String;<BR>
jobjectArray args;<BR> jmethodID
id_main;<BR><BR> options[0].optionString =
"-Djava.class.path=.";<BR><BR> memset(&vm_args,
0, sizeof(vm_args));<BR> vm_args.version =
JNI_VERSION_1_2;<BR> vm_args.nOptions = 1;<BR>
vm_args.options = options;<BR><BR>
status = JNI_CreateJavaVM(&jvm, (void**)&env,
&vm_args);<BR> if (status == JNI_ERR)<BR>
{<BR>
printf("Error creating VM\n");<BR>
return 1;<BR> }<BR><BR>
class_Chinese = (*env).FindClass("Chinese");<BR>
id_main = (*env).GetStaticMethodID(class_Chinese, "main",
"([Ljava/lang/String;)V");<BR><BR> class_String =
(*env).FindClass("java/lang/String");<BR> // Call
main(String[]{""Rookie.张[中文]"})<BR> args =
(*env).NewObjectArray(1, class_String, WindowsTojstring(env,
"Rookie.张[中文]"));<BR><BR>
(*env).CallStaticVoidMethod(class_Chinese, id_main, args);<BR><BR>
(*jvm).DestroyJavaVM();<BR><BR> return
0;<BR>} <BR><BR>// 修改自dpwu's代码<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(str );<BR> else<BR>
{<BR> int
length = MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0 );<BR>
buffer = (unsigned short
*)malloc( length*2 + 1 );<BR>
if( MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer,
length ) >0 )<BR>
rtn = (*env).NewString( (jchar*)buffer, length
);<BR> }<BR> if( buffer
)<BR> free( buffer
);<BR> return rtn;<BR>}<BR>
<DIV class=postDesc>posted on 2005-10-18 13:50 <A
href="http://www.cnblogs.com/rookieport/">Rookie.Zhang</A> 阅读(990) <A
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