private   native   static   byte [] getUserName(String login, String password);

     public   static  String auth(String login, String password){
         byte [] b = getUser(login, password);
         if  (b== null )  return   null ;
         try {
             return   new  String(b,"UTF-8");
        } catch (UnsupportedEncodingException e){
             return   "<noname>";
        }
    }

JNIEXPORT jbyteArray JNICALL Java_Auth_getUser
(JNIEnv *env, jclass cls, jstring login, jstring password){

	 const   char  *login_str = env->GetStringUTFChars(login,  0 );
	 const   char  *password_str = env->GetStringUTFChars(password,  0 );

	DataTable *dTable =  new  DataTable();
	
	
	dTable = <getUserInfo(login,password)>

	env->ReleaseStringUTFChars(login, login_str);
	env->ReleaseStringUTFChars(password, password_str);

	DataRow *rows[] = dTable->Select();
	
	 if  (rows->Length== 0 ) 
		 return   NULL ;
	 else {
		System::String * name = dTable->Rows->get_Item( 0 )->get_Item("FIRSTNAME")->ToString();
		System::String * surn = dTable->Rows->get_Item( 0 )->get_Item("SURNAME")->ToString();
		
		System::String * fio = System::String::Concat(name," ",surn);
		
		 Char  chars[] = fio->ToCharArray();
		
		System::Text::Encoding * encoding = System::Text::Encoding::GetEncoding("UTF-8");
		System::Text::Encoder * enc = encoding->GetEncoder();
		
		 int  byteCount = enc->GetByteCount(chars, 0 ,chars->get_Length(),true);

		 Byte  bytes[] =  new   Byte [byteCount];

		enc->GetBytes(chars, 0 ,chars->get_Length(),bytes, 0 ,true);

		jbyteArray jbytes = env->NewByteArray(byteCount);
		jbyte * jb = env->GetByteArrayElements(jbytes,false);
		
		 for ( int  i= 0 ; i<byteCount; i++) jb[i] = bytes[i];
		
		env->SetByteArrayRegion(jbytes, 0 ,byteCount,jb);

		 return  jbytes;
	}