JNI中的中文处理

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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;
}