jni 中文

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, const char* str )
{//gb2312转换成utf8/16
    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;
}