application of component programming in a networking environment
Contents
1. with varying privileges The above factors had been considered in the AutoQuiz implemented as shown in figure 4 to 8 The database used currently is MS Access Actual Automated Quiz was conducted for the subjects such as Telecommunications and Industrial Electronics in the period of February up to May 1999 at Maranatha Christian University and from October 2001 till now for the subjects such as Human Computer Interaction Computer Security as well as for Laboratory Assistants Selection test at Universitas Pelita Harapan Computer Laboratories with promising results i e benefiting both the students and lecturer IF YOU WANT TO START THE QUIZ CHOOSE YOUR SUBJECT AND PRESS e E OR IF YOU WANT TO CANCEL THEN JUST PRESS ihre oo Available subjects currently are Lelecommunications EE a De Electric Circuit Pathe Se nate Se Figure 4 Auto Quiz Main Menu Application of Component Benny Hardjono 71 Enter your personal Data Enter your Name and ID before you attempt the AutoQuiz then press OK Name PRETTY GUTSY p Student s peas o wh Figure 5 Entering Personal data before the Quiz is started Question Ha 14 Tima 40 Nilai vimana akustik adalah x niini ahaorbsi anarji dari suatu ruangan pada irakiene tertentu 3 aa aktu gama dan waktu yg daperhukan Mukanya dan aiias ener tunra dalam suatu dangan trun juta kali dari nilai sebalun2. buying original softwares The arrival of component programming in the 1990 s could be one of the solutions to overcome these problems as it provides a relatively easy way to develop custom made software for local use However this information might not have been well publicized or those who had heard of it were not convinced that it could be a solution Further more not many computer programmers in the higher education institutions are familiar or interested enough to develop their own software since many pirated software for single user on single machine or networkable for multi users software are available in their country especially in Asia It is a common knowledge that the usage of pirated software is against the international law and that is usually plagued with various problems and limitations such as the lack of manuals and inflexibility for further development However many people still violate the law because they could only see the short term advantage and often fail to grasp and that by making their own customized software is a long term solution which avoids piracy and overcomes the need for licensing cost In short making their own software is at least cheaper and relatively easier for further development This paper is an adapted version originally was submitted and accepted for the Seminar titled Technology and Higher Education hosted by Philippine Christian University amp ACUCA Association of Chris
3. different kind of bite Polymorphism means that a programmer can call a bite without having to know from which Object does the bite comes even though the user will be able to tell later whether the bite comes from a Lion or a Mouse from the bite effect Polymorphism Application of Component Benny Hardjono 67 is given by Visual Basic e g for windows through a multiple interface called Activex previously known as OLE or a short for Object Linking amp Embedding and not through inheritance C developers are familiar with class hierarchies that describe inheritance Inheritance is the manner in which objects are derived from similar objects inheriting their behavior Visual Basic OLE automation server object hierarchies on the other hand describe containment Containment describes how an object can contain other objects Multiple Interface facility is one superior advantage of Component Object Model more commonly known now as DCOM or Distributed Component Object Model over the conventional programming because it enables a program to evolve by including new functions without damaging the existing programming Code even for a multi user environment 3 Examples amp their relation to the advancement of Higher Education 3 1 Library Automation This application software was designed to overcome inefficiencies in data access especially to manage book collection and circulation The approach of bar coding database search and man
4. APPLICATION OF COMPONENT PROGRAMMING IN A NETWORKING ENVIRONMENT FOR THE ADVANCEMENT OF HIGHER EDUCATION Benny Hardjono B EE M Eng Abstract To spread the application of component programming for the advancement of higher education a basic theory of component programming e g with MS Visual Basic as well as three practical examples and their design considerations are presented in this paper These include library automation with facilities such as bar coding catalogue and borrowed book search circulation management easily tailored report etc automated quiz and two examples of simulation program all with graphical interface and currently are running in a networking environment using MS Windows NT 4 as server 1 Introduction There are many ready made software packages available in the market nowadays despite this few are immediately ready to be utilized in an Asian context other than word processors and spread sheet software to increase academic excellence Due to reasons just to name a few such as low local currency to US dollar exchange rate high implementation cost ref table 1 shows a number of software price and licensing cost for single and multi user as an example to highlight the problem inflexibility for adaptation and development low adaptability for a local networking environment under developed human resources e g difficulty in reading English manuals and the lack of urgency in
5. S Windows NT 4 server at Maranatha Christian University MCU and at Universitas Pelita Harapan UPH The examples presented here are by far perfect and have not used all the advanced capabilities of component programming Hardjono 1995 1997 1998 they are merely examples to attract more computer programmers to make their own custom made software and to gather moral and financial support from the institution s executives and administrators so that all can work together for the betterment of higher education 2 Basic Theory A component is a physical encapsulation of one or more services that are made available through its interfaces It can be an exe file or dll file a collection of 66 Jurnal Ilmiah Ilmu Komputer Vol 1 No 1 Januari 2003 65 76 f 2 zi F PS JL P 2 4 database triggers stored procedures or any number of other physical software entities A component is defined by the services it provides and how it interacts with other components The internal construction and implementation are hidden from the outside world and in this sense components share the modular and encapsulating characteristics of business Objects Microsoft Visual Basic Guide to Building Client Server 1997 Business Objects can be thought as specialized application Objects They are self contained and in the services model of a three tier architecture they map to the second tier the tier that houses the organization s business
6. agement is of course applicable also for company asset tracking shops and department stores purchasing process For this application the database used in MCU was MS Access and in UPH is MS SQL still in progress As can be seen in figure 1 there are four main Forms Members management cataloging Book Collection management and Circulation Each Button s enable property can be enabled or disabled thus the application can be adapted easily for students use i e Button Catalogue only will be enabled or for staff s use all Buttons are enabled Th Mar anatha Christian Unneoosity iir ary OMEGA Library Management System MARANATHA ENGINEERING LIBRARY Use CTRL Z ta UNDO Use CTAL O te reDO Se es Mt M PA Pe na Rep Figure 1 The Main Menu of Library Automation software 68 Jurnal Ilmiah Ilmu Komputer Vol 1 No 1 Januari 2003 65 76 ext is the Circulation Form Figure 2 which is called after the Circulation button in figure 1 is pressed Note for staff s set up a password form must be filled in first which is not shown here In this Form after the Library staff enters via a Keyboard or read through a Bar code scanner the student s ID number or membership number the cursor will be moved to the Book Bar code data field e g number 007004488 in Figure 2 where 007 means the engineering Dept and 4488 is the book number and the student s relevant data will be shown Then when the Ba
7. anya ma yang tidak mengganggu Setan Ba fiorini a Your Answer B NAP 9844444 Figure 6 Randomized Multiple Choice Questions for the student 12 Jurnal Ilmiah Ilmu Komputer Vol 1 No 1 Januari 2003 65 76 Time apai 190 Second ATTENTION Do not EXIT ai until your name amp student s ID are recorded Aes Show your student s ID 0 Figure 7 Student s score is available immediately after answering the last question Ma Kadal Ubeslazi APIU Mabel Cet aial piina ai Aulia ian atama akustik milala A ii yang tidak mengganggu imi CS Figure 8 Question and answer form for the lecturer 3 3 Simulation Program Software Simulations can help students understand better a particular subject of their interest It can be a subject with laboratory or without laboratory work Further more students can see expensive equipment at work without the necessity for the university to have to purchase the actual equipment Unfortunately even this kind of application software is not easily available in the market and often are relatively expensive to buy The following is two examples of simulation program just to ilustrate that OOP can be used to make customized simulation software Application of Component Benny Hardjono 73 Fisheries sonar is a very useful eguipment especially for a maritime country like Indonesia However this eguipment is usually imported Figure 9 shows how an ac
8. braries Reference is needed to use an Object this is called Object Variable Object variable s execution speed is depended on its Binding There are three types of Binding for example an Object declared as Dim var_name As classname uses the fastest binding It is recommended to use late Binding for calls to the Internet Explorer Scripting Object Model Using early Binding fastest will almost certainly cause compatibility problems in the future while late Binding will always work Microsoft 1997 In other containers it is possible to make use of early Binding Accessing properties and methods of a control is faster if a variable declared with the same type as the control for example As TreeView or As CommandButton is used this is because Visual Basic can use early Binding But Visual Basic must use late Binding to access properties and methods of a contro assigned to a variable declared As Control Due to this reason a program must be planned well before the actual programming code is written Form and Control are two examples of Object which have the above three characteristics Even though Control is an independent Object there is a parent and child relationship between Form and Control A Form can contain Control An additional feature in OOP is Polymorphism With this feature a programmer without having to know which Class an Object owned can manipulate Objects For example two classes are declared Mouse and Lion the two have a
9. ent ID number is displayed again so that the supervisor or lecturer can note down the result and re check the student s identification card should be with a photo This information also goes automatically into the database The lecturer can see the results immediately on his computer display while the quiz is still in progress After the quiz the table of results can be printed or saved easily 70 Jurnal Ilmiah Ilmu Komputer Vol 1 No 1 Januari 2003 65 76 A form to create new modify delete or add multiple choice Question and answer should be available for lecturers e g Figure 8 in another version of AutoQuiz program restricted in its use by password system in AutoQuiz and user level permission in Windows NT Essay type questions can be entered and availability of input field for program path in file server useful for how to program test The language and database software chosen should be able to display pictures and diagrams in order to make more complex multiple choice questions e g A diagram of a computer shown in figure 6 The server s power line should be backed up by using an Uninterruptible Power Supply UPS The database system should be reliable i e can be repaired and compacted automatically by the AutoQuiz when it is necessary to solve data corruption and server hard disk space wastage and should be secure for the networking environment applying passwords for data base and users
10. gram References 1 Firdaus C Tjong W S Sistem Pengaman Network pada Paket Lunak Berbasis Windows 95 NT Network security system for Windows 95 NT based software Kerja Praktek dengan Pembimbing B Hardjono 1998 Application of Component Benny Hardjono 75 Goren C Scmelzer J Smith J Visual Basic 4 Enterprise Development QUE 1996 pp 165 304 Hardjono B Otomatisasi akses data dengan menggunakan basis data dan kode batang Automatic data access using database and bar code system 1998 majalah ilmiah UKM University s Research magazine Hardjono B Otomatisasi Akses Informasi dengan menggunakan perangkat lunak untuk sistem Kode Batang Bar Code System dan pemanfaatan perangkat kerasnya Automatic information access utilizing custom made bar coding software and its hardware 1997 Laporan Penelitian A research report Hardjono B S A S Tool Siemens Automated Survey Tool a Windows based application software made for Siemens Telecommunication Project Office User s manual and software tool copy right B Hardjono and Siemens TPO Bandung Indonesia 1995 McKelvy M Martinsen RR Web J Riselman B Using Visual Basic 5 Special Edition QUE 1997 chapter title Applying Computer Science Techniques in Visual Basic sub chapter Advanced Code Techniques Microsoft Corporation Programmer s Guide MS Visual Basic Version 5 Programming System for Windows 95 dan Windows NT p 5 337 Microsof
11. in quickly assessing their quality of teaching and students current perception of the material being taught More over since students result will be entered in to the server s database automatically it will cut down the lecturer s time spent for examining and scoring each student s work There are a number of important factors considered in automating a quiz More than one subject should be available for quick assessments in Figure 4 for example there are two subjects available Also participation from other lecturers to help to make a bank e g of 50 of multiple choice questions and answers is beneficial to socialize the use of this tool a series of presentations should be conducted Student s identification still needs to be confirmed even though each quiz participant must fill in his or her name and student s ID number Figure 5 Questions in this case 20 out of 50 questions and answers position should be randomized to avoid cheating by looking across to other student s answers as can be seen in Figure 6 e g student 1 say has question 19 with the correct answer at A although has the same question at number 5 to student 2 sitting next to him her has the correct answer at D The Automated Quiz should be relatively easy to use mouse control and short cut keys should be available In Figure 7 student s score and time spent are available immediately after answering the last guestion the stud
12. r code is read from the Bar code label on the book the appropriate book data will appear and the staff can either press Borrow for borrowing case or Return in this case Borrow button will be disabled because the borrowing date is already filled in The Borrow and the Return dates are entered automatically by the software utilizing the server s system clock In this case the software the server and the connected workstations were already tested for year 2000 compliance 11 BSC Barrew alla a ee i 007004499 P firsa a I Figure 2 Circulation Form Besides Circulation Book Collection also needs management Figure 3 shows this facility Besides the common facilities such us Class Sub Class ISBN Title etc Another facility is the ability to print Bar codes out on plain A4 papers as well as on special sizes using ordinary printer Application of Component Benny Hardjono 69 A Data Porpustahaan k Rook I SULT Sub Class 4 ISBN Max 14 Glee 20 ea 1513 CRA jesasarsenga Ls La lier Nome Author Craig AF idm 40 to ot The Mekanika tanah oleh R F Craig 0d 4 Max 125 acara 1 dari 12294 or Yee Dutu Cantal beside ta bart EDIT Da man Figure 3 Book Management Form 3 2 Automated Quiz AutoQuiz AutoQuiz is designed to help students in their studies giving them quick feed back to their current knowledge of the subject of their interest It can also help lecturers
13. rules Goren C 1996 Visual Basic available in the market since 1991 for MS Windows Perry 1994 is one of the component programming software which utilizes Objects in form of Control Form and Database mentioned before As a result it is also categorized as Object Oriented Programming more commonly abbreviated as OOP because in OOP an Object is created first along with its Property and the programming Code is written last This is different than the conventional approach such as Turbo Pascal or Fortran 77 It is encapsulated because it can contain both Data and programming Code contained in e g Module and Form hence it tends to have easier control than the past traditional programming method Microsoft 1997 Other characteristics embedded in Objects are Event Property and Method Event is all the actions noun which an Object can do e g a click of a button on Form Next Property it is a character which can explain the attribute s in an Object While the third Method is all the verbs which can be commanded carried out by the Object A group of programming codes can be executed while certain events are happening An Object is an instance of a Class A Class will define the interfacing of an Object whether it is Public for general usage and the kinds of condition this Object can be made The details of a Class can be seen through an Object Browser part of Visual Basic programming Menu which are stored in type li
14. t Corporation 1997 Microsoft Corporation Visual Basic Guide to Building Client Server MS Visual Basic 5 Programming System for Windows 95 and Windows NT MS Coprp 1997 pp 101 Perry P Teach Yourself Visual Basic 3 in 21 Days Sams Publishing 1994 Salemi J Client Server Databases Ziff Davis Press 1993 16 Jurnal Ilmiah Ilmu Komputer Vol 1 No 1 Januari 2003 65 76
15. t programming enables a programmer to add new functions re use existing group of programming codes e g under a Form or Module and even generate multi user customized software with relative ease However because it is inherently event driven a program must be planned well before the actual write up This is a must especially if a team of programmers writes the program code If customized software can be written by the institutions programmers according to their needs it can contribute in improving the quality of local higher education system Acknowledgement The author would like to express much gratitude to Maranatha Christian University amp its foundation the Chancellor Dr Daniel Wibowo MSc Vice Chancellor Mrs A Supartono Ir MSc for their moral and financial support Not forgetting also the Chancellor s secretary plus other staffs too many to mention who had been helpful in one way or another so that this paper can be presented in this seminar In addition my thanks goes to many final year students a few have already become alumni like Andreeyanto V Yoswandi H Paulus E P and Budyanto who had helped me in the initial development of the electronic library data entry etc as well as Gunawan E amp Wiharja J W who had helped me in the initial development of Automatic Quiz system single user and last but not least Handini V amp Tedja S who had participated in the development of simulation pro
16. tian University amp Colleges in Asia May 12 13 1999 at Hidden Valley Resort Manila Dosen Tetap Jurusan Teknik Informatika dan Kepala Lab Komputer UPH from Sidola Bandung Indonesia 1999 and www r tech com Oct 18 2002 Application of Component Benny Hardjono 65 Networkable multi user _ e g Windows NT with Office XP SE Standard Office XP Prof Office XP Standard _ Visual Basic Net 2002 Standard Visual Basic nterprise V6 0 with plus Pack o Protel 5371 Singlepoit _OrCAD complete 2162 Winnebago 5000 only OPAC amp Spectrum Library Catalog modules not database desk top type Management including Circulation i e Foxpro Sofware ect aa ma 25 points __ SQL Server v 7 WindowsNT 589 SCA points SC In order to spread the use of component programming a basic theory of component programming e g with MS Visual Basic as well of three practical examples are presented in this paper These include library automation OMEGA Library Management System with facilities such as bar coding catalogue and borrowed book search circulation management easily tailored reports etc automated quiz AutoQuiz with security aspects considered Firdaus and Tjong 1997 and two examples of simulation program all with graphical interface and are currently running year 2000 compatible in a networking environment using M
17. tual Fisheries Sonar can work As a start the location of school of fish up to 9 schools of fish can be generated randomly is generated randomly by the program and as the school of fish moves the angle its radial distance as well as speed from the sonar are shown in a table It can be adapted and calibrated in the future to receive the angle and distance data from an actual sonar equipment e g through a serial port which scans radially of a circle area up to 16 km or 16 000 meter in diameter Figure 9 Simulation of Fisheries Sonar The second example Figure 10 shows that a student can find out the minimum required distance for a moving vehicle to come to a full stop after for example an initial speed of 100 km h and a strong application of the break pedal which has caused a negative acceleration of 10m sec applied when the vehicle s rear still touching the long pole marker on the left hand side For further investigation the road angle at a slope an inclination instead of just horizontal vehicle s weight amp its centre of gravity as well as road type smooth or rough can be varied 14 Jurnal Ilmiah Ilmu Komputer Vol 1 No 1 Januari 2003 65 76 Time apani 24 second Braking fetes 2857019 matm Antual Speed 0 imh W Star TP Meorusah Word AJ Exploring Dut 4 Project Mior Braking Dist UEA wA Figure 10 Vehicle s Braking Distance Simulation 4 Summary Componen
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