PROGRAMMERZ

Encryption - Decryption program with VB

2009-09-26T06:58:00.000-07:00

Encryption is the process of transforming information (referred to as plaintext) using an algorithm (called cipher) to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key.
The result of the process is encrypted information (in cryptography, referred to as ciphertext).
In here, we would shown sample program with application that displayed like the following:

This program will be encrypted all words are input by user at textboxt text label. Then the output will be display at textboxt with label Hasil enkripsi and vice versa. The output of decryption will be display at textbox Hasil Deskripsi label.

The following is sample of main code:

Private Sub cmd_enkrip_Click()
Dim Enkrip, Output, Inputan As String
Dim Panjang_Input As Integer
Inputan = Text1.Text
Panjang_Input = Len(Text1.Text)
For i = 1 To Panjang_Input
Enkrip = Mid(Inputan, i, 1)
Enkrip = Asc(Enkrip)
Enkrip = (Enkrip + 5) - 13
Enkrip = Chr(Enkrip)
Output = Output & Enkrip
Next i
Text2.Text = Output
End Sub

Private Sub cmd_dekrip_Click()
Dim Dekrip, Output, Inputan As String
Dim Panjang_Input, Pesan As Integer
Inputan = Text3.Text
Panjang_Input = Len(Text3.Text)
For i = 1 To Panjang_Input
Dekrip = Mid(Inputan, i, 1)
Dekrip = Asc(Dekrip)
Dekrip = (Dekrip - 5) + 13
Dekrip = Chr(Dekrip)
Output = Output & Dekrip
Next i
Text4.Text = Output
End Sub

Private Sub cmd_hapus_Click()
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
Text4.Text = ""
End Sub

Private Sub Command3_Click()
End
End Sub

C# Tutorial For Beginner (IV) --> The Last

2009-06-30T05:14:00.000-07:00

You will need a C compiler, I advise gcc for windows called MinGW, it's free, it's good, it's GCC!
We will create 3 file:
echo.c

#include

#define DLLOBJECT __declspec(dllexport)

DLLOBJECT void writeln(char* s)
{
printf("%s\n", s);
}

echo.cs

using System;
using System.Runtime.InteropServices;

namespace HelloUtil
{
public class Echo
{
[DllImport("echo.native.dll", CallingConvention=CallingConvention.Cdecl)]
static extern void writeln(string s);

string myString;

public Echo(string aString)
{
myString = aString;
}

public void Tell()
{
writeln(myString);
}
}
}

hello.cs

using System;
using HelloUtil;

public class Hello
{
public static void Main()
{
Echo h = new Echo("Hello my 1st interop code !");
h.Tell();
}
}

Hehe, here you discover a completly new thing, Attribute.
"[DllImport(.." is an attribute.
You could tag any method/field/class with any number of attribute.
They generate extra information that could be used by anyone who could understand them.
This DllImport attribute is understand by the compiler and told him that the function below is in fact in a DLL whose name is "echo.native.dll". I add a calling convention parameter as the default .NET calling convention is __stdcall whereas, in C, it's __cdecl.
By the way, if you look for DllImport in the documentation, look for DllImportAttribute, because you remove "Attribute" to attribute classname when using them, it's like this.

And now let's compile this!

> csc /nologo /t:library /out:echo.dll echo.cs
> csc /nologo /out:hello.exe /r:echo.dll hello.cs
>
> rem "if the following line don't work, read bellow.."
> gcc -shared -o echo.native.dll echo.c
> strip echo.native.dll

the 2 last line (the gcc & strip command) are for building the "C-DLL".
If they don't work maybe gcc is not in a directory listed in your path environment variable ? check with:
%lt; echo %PATH%
Well it's probably not,anyway, so type, assumin mingc is in C:\MinGW:
set PATH=C:\MinGW;%PATH%
And try again... you sure it's not a syntax error ?
If it compile test it now: hello
Great isn't it ?

Now I should admit I didn't tell you all the truth. echo.dll and echo.native.dll are not the same kind of DLL. It's not just the language (C / C#) the C one is a plain executable full of, probably, x86 instruction, whereas the C# one is what MS call a portable executable.. anyway they are different.
If you install echo.dll in the GAC it wont work because it won't find echo.native.dll except if you put in into the PATH (like C:\Windows\System32).
In the same manner when you add the reference in VS.NET echo.native.dll is overlooked and your program won't work....
So either put the native one in your path or copy it in the debug/release directory of VS.NET.
Or do everything by hand (makefile? build.bat?) and put all your dll in you build directory, and everything work fine..

C# Tutorial For Beginners (Part III)

2009-06-26T06:33:00.000-07:00

Now you become to be pretty confident, I guess, so we could start using multiple file, and even a dll ? go into an other directory (or stay in this one, I won't mind) and create 2 file:

hello.cs

using System;

public class Hello
{
public static void Main()
{
HelloUtil.Echo h = new HelloUtil.Echo("Hello my 1st C# object !");
h.Tell();
}
}

echo.cs

using System;

namespace HelloUtil
{
public class Echo
{
string myString;

public Echo(string aString)
{
myString = aString;
}

public void Tell()
{
Console.WriteLine(myString);
}
}
}

Note in hello.cs I have used the syntax "HelloUtil.Echo" it's because Echo is in the namespace HelloUtil, you could have typed (at he start of the file) using HelloUtil and avoid HelloUtil., that's the way namespace work.

Now you could compile both in one .exe with
> csc /nologo /out:hello.exe *.cs
But it's not my intention, no.
Well.
(Have you tried?)
Let's go building a DLL:
> csc /nologo /t:library /out:echo.dll echo.cs
that's it (dir will confirm).
Now we could use it ...
> csc /out:hello.exe /r:echo.dll hello.cs
if you typed "hello" it will worked as usual..., but if you delete "echo.dll" the program will now crash: it use the DLL. You could also change Echo.cs, rebuild the DLL and see... that's the advantage of DLL!

You could also put your DLL in the global assembly cache (GAC), and any program would be able to access it, even if the DLL is not in its directory!
to put it in the GAC, I sugest you read MS doc but here are the unexplained step:

1. create your assembly key, create it once and use it for every version. you create it with:
sn -k myKeyName.snk
the .snk file should be in your compilation directory (the one where your run csc)
2. create a strong asssembly title by adding in any .cs source file the following directive at top level:

using System.Reflection;
using System.Runtime.CompilerServices;
[assembly: AssemblyTitle("My Lib Title")]
[assembly: AssemblyVersion("1.2.3.4")]
[assembly: AssemblyKeyFile("myKeyName.snk")]

3. now add it to the GAC:
> gacutil.exe /if myLib.dll

By the way, did I tell you ? when I referenced the hello.dll while compiling, remember? csc /out:hello.exe /r:echo.dll hello.cs, it could have been any assembly, even a .exe !!!

C# Tutorial For Beginners (Part II)

2009-06-23T04:29:00.000-07:00

Congratulation you've done the most difficult, let increase the difficulty. and create an object instance. in the DOS shell create a new directory:

> md ..\learncs2
> cd ..\learncs2
> notepad hello.cs

and then type, in the notepad

using System;

public class Echo
{
string myString;

public Echo(string aString)
{
myString = aString;
}

public void Tell()
{
Console.WriteLine(myString);
}
}

public class Hello
{
public static void Main()
{
Echo h = new Echo("Hello my 1st C# object !");
h.Tell();
}
}

Wouah, 25 lines! That's a program! Save it, compile it, run it...
What happened? csc look for a Main() function in your program, it should find one (and only one) and it will be the entry point of your program.
In this tutorial we create 2 classes: Echo & Hello. In the Main() method you create an Echo object (an instance of the Echo class) with the keyword new
Then we called the instance method "Tell()".
the upper case letter on class or Method is just a MS convention, do as it pleased you.
public is a visibility access, method wich are not public could not be seen from outside, there is also other visibility keywords, to learn more, clic on Start menu-> Programs -> Microsoft .NET Framework SDK -> Documentation there is a search window, an index window, etc... try to learn more about public private protected.

C# Tutorial For Beginners (Part I)

2009-06-22T09:36:00.000-07:00

So you just install .NET framework and want to start using C# but you don't know where to start ? well...

First you could download this complete tutorial here. There is a directory for each tutorial with a build.bat to build the tutorial and a run.bat to run the program. And every example is already compiled, just in case...

You should first open a DOS command shell. (If you don't know what it is, clic on the Start menu then run (at the bottom) and type, in the text field: "cmd".
exercise: there is an easiest way to do that, try to find it.)
You should begin to work in an empty directory for this. let call it "C:\learncs". Type in the shell:

> md C:\learncs
> cd C:\learncs
> C:

Now you should create your first C# program, type "notepad hello.cs" and type (in the notepad)

using System;

public class Hello
{
public static void Main()
{
Console.WriteLine("Hello C# World :-)");
}
}

the using keyword just let you write Console at line 7, instead of System.Console. It's very usefull shortcut when you use a lot of "class" define in System.
Save the file.
Now you could compile. Type in the DOS Shell again and type:
csc /nologo /out:hello.exe hello.cs
You probaly have some errors, correct them, compile again, and now you have a working hello.exe program... type hello, see...

Free ebook Microsoft Visual studio 2008

2009-06-14T22:41:00.000-07:00

DOWNLOAD EBOOK NOW

Microsoft press give free ebook with name title: Microsoft Visual C# 2008 Express Edition: Build a Program Now!”.
This ebook has covered in .pdf format. This ebook written by Patrice Pelland (ISBN: 9780735625426.
The topics in this ebook that are:
* Introducing Microsoft Visual C# 2008 Express Edition
* Installation Visual C# Express Edition
* Creating Your First Applications
* Creating Your Own Web Browser in Less Than Five Minutes
* Using Rapid Application Development Tools with Visual C# 2008
* Modifying Your Web Browser
* Fixing the Broken Blocks
* Managing the Data
* Building Your Own Weather Tracker Application

C++ Round Program

2009-06-14T21:54:00.000-07:00

#include

#include

void main() {

int r;

float Luas,phi=3.14;

{

printf("masukan Jari-jari : ");

scanf("%i",&r);

Luas=phi*r*r;

printf("Luas Lingkaran Adalah %2.f",&Luas);

}

getch();

}

Introducing Java Script

2009-06-14T11:50:00.000-07:00

* JavaScript was designed to add interactivity to HTML pages
* JavaScript is a scripting language
* A scripting language is a lightweight programming language
* JavaScript is usually embedded directly into HTML pages
* JavaScript is an interpreted language (means that scripts execute without preliminary compilation)
* Everyone can use JavaScript without purchasing a license

Are Java and JavaScript the same?

NO!

Java and JavaScript are two completely different languages in both concept and design!

Java (developed by Sun Microsystems) is a powerful and much more complex programming language - in the same category as C and C++.

J2SE

2009-06-14T11:07:00.000-07:00

he Java 2 Platform has various incarnations as well, including Java 2 Platform, Standard Edition (J2SE). J2SE is used primarily for writing applets and other Java-based applications.One of the primary uses of J2SE is the development of Java applications for individual computers. Web-based activity sometimes lives and dies by the successful integration of applets into e-commerce and other Web-specific functions. J2SE applets and other applications make these functions run smoothly; without them, many transactions and other Internet interactions would not take place. In this way, J2SE is a tremendous enabler of Web activity.
Another important functionality made possible by J2SE is JavaBeans. These are reusable applications that can be developed and assembled easily in order to create more sophisticated applications. Basically, they are the building blocks of personalized J2SE applications. Java may be the base technology, but JavaBeans are what makes J2SE functionality and individuality really click.

PHP Installation

2009-06-11T19:30:00.000-07:00

If your server supports PHP you don't need to do anything.Just create some .php files in your web directory, and the server will parse them for you. Because it is free, most web hosts offer PHP support.However, if your server does not support PHP, you must install PHP.Here is a link to a good tutorial from PHP.net on how to install PHP5: http://www.php.net/manual/en/install.php

Download PHP for free here: http://www.php.net/downloads.php

Download MySQL for free here: http://www.mysql.com/downloads/index.html

Download Apache for free here: http://httpd.apache.org/download.cgi

Note: If you want simple installation for use PHP, you just need install WAMP or XAMPP Application.

Do you know about PHP?

2009-06-08T09:26:00.000-07:00

PHP stands for PHP: Hypertext Preprocessor
PHP is a server-side scripting language, like ASP
PHP scripts are executed on the server
PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.)
PHP is an open source software
PHP is free to download and use
PHP files can contain text, HTML tags and scripts
PHP files are returned to the browser as plain HTML
PHP files have a file extension of ".php", ".php3", or ".phtml"
PHP runs on different platforms (Windows, Linux, Unix, etc.)
PHP is compatible with almost all servers used today (Apache, IIS, etc.)
PHP is FREE to download from the official PHP resource: www.php.net
PHP is easy to learn and runs efficiently on the server side
PHP combined with MySQL are cross-platform (you can develop in Windows and serve on a Unix platform)
MySQL is a database server
MySQL is ideal for both small and large applications
MySQL supports standard SQL
MySQL compiles on a number of platforms
MySQL is free to download and use

Installing Java on Windows

2009-06-07T13:18:00.000-07:00

Install
Download Java Development Kit (JDK). http://java.sun.com/javase/downloads/index.jsp

Configure
Set environment variable, %PATH%.

Verify

Finish

Simple Java Program

2009-06-05T21:11:00.000-07:00

Here is an example Java program. It is about as small as a Java program can be. When it runs, it writes Hello World! on the computer monitor. The details will be explained later.

class Hello
{
public static void main ( String[] args )
{
  System.out.println("Hello World!");
}
}

This program can be created using a text editor such as the Notepad editor that comes with Windows. (Details later.) This source program is a text file saved on a hard disk. The file is named Hello.java.

A source program is a text file that contains a program (such as above) written in a programming language. Since it contains ordinary text (stored as bytes) it can not be directly executed (run) by the computer system. As a text file, you can print it, display it on the monitor, or alter it with a text editor.

Introduction Java

2009-06-05T20:07:00.000-07:00

The Java™ language, and the ever-growing Java platform, have revolutionized programming. The goal of this tutorial is to introduce you to the Java syntax you're most likely to encounter professionally, and to expose you to idioms that will help you avoid trouble. Follow along with Java professional Roy Miller as he guides you through the essentials Java programming, including the OOP paradigm and how it applies to Java programming, Java language syntax and use, creating objects and adding behavior, working with collections, handling errors, and tips for writing better code.

Multiple editions of the Java platform
Three editions of the Java platform make it easier for software developers, service providers, and device manufacturers to target specific markets:

Java SE (Java Platform, Standard Edition). Java SE lets you develop and deploy Java applications on desktops and servers, as well as embedded and real-time environments. Java SE includes classes that support the development of Java Web services and provides the foundation for Java Platform, Enterprise Edition (Java EE). Java SE 6 ("Mustang") is the current version of the Java SE platform. Many Java developers use Java SE 5, also known as Java 5.0 or "Tiger."
- The Taming Tiger columns provide an excellent overview of Java SE 5. Many existing Java applications are based on Java SE 5, and most of the concepts in this series are relevant to Java SE 6 programming.
- "Monitor and diagnose performance in Java SE 6" describes performance and monitoring enhancements in Java SE 6.
- "Create rich applications with JavaFX Script" introduces a scripting language that runs on top of Java SE 6 and makes it easy to code sophisticated user interfaces.
- The two-part article "Invoke dynamic language dynamically" introduces a Java SE 6 API that enables Java code to execute dynamic scripting code, and vice versa. (See How does Java technology relate to dynamic languages and functional programming? below, for more information on using scripting languages with the Java platform.)
Java EE (Java Platform, Enterprise Edition). The enterprise version help you develop and deploy portable, robust, scalable, and secure server-side Java applications. Building on the foundation of Java SE, Java EE provides Web services, component-model, management, and communications APIs for implementing enterprise class SOA and Web 2.0 applications.
- "Get to know Java EE 5" and "Java EE 5: Power and productivity with less complexity" introduce you to the latest version of the Java EE platform.
- Check out The Spring series to learn about a popular framework for building build lightweight, robust Java EE applications.
- The J2EE pathfinder columns add to your knowledge of Java EE.
- The Getting on the open road: Migrate to the Java platform article series is designed to help developers of .NET, Windows client/server, and ASP applications make the jump to the Java EE platform.
Java ME (Java Platform, Micro Edition). Java ME provides an environment for applications running on a broad range of mobile and embedded devices, such as mobile phones, PDAs, TV set-top boxes, and printers. The Java ME platform includes flexible user interfaces, a robust security model, a broad range of built-in network protocols, and extensive support for networked and offline applications that can be downloaded dynamically. Applications based on Java ME specifications are written once for a wide range of devices yet exploit each device's native capabilities.
- Learn more in the comprehensive four-part series of two tutorials and two companion articles that focus on J2ME and the Mobile Information Device Profile (MIDP).
- Another helpful resource is the two-part tutorial "Build smart J2ME mobile applications."

Multidimensional Arrays

2009-06-03T19:57:00.000-07:00

Sample Code Mutidimensional Arrays:

#include
#include
using namespace std;
char representative[2][20] = {"AAAAAAAAAAAA",
"BBBBBBBBBBBB"};
int articleCount[2][5] = { { 120, 151, 130, 117, 144},
{150, 120, 190, 110, 188}
};
int main(){
for( int i=0; i < 2; i++ ){
cout <<"\nRepresentative: " <<>[i];
cout << "\nNumber of items sold: ";
for( int j = 0; j < 5; j++ )
cout <<>(6) <<>[i][j];
cout <<>
}
return 0;
}

Output:

Introduction C#

2009-06-03T17:54:00.000-07:00

C# (pronounced "C sharp") is a simple, modern, object-oriented, and type-safe programming language. It will immediately be familiar to C and C++ programmers. C# combines the high productivity of Rapid Application Development (RAD) languages and the raw power of C++.

Visual C# .NET is Microsoft's C# development tool. It includes an interactive development environment, visual designers for building Windows and Web applications, a compiler, and a debugger. Visual C# .NET is part of a suite of products, called Visual Studio .NET, that also includes Visual Basic .NET, Visual C++ .NET, and the JScript scripting language. All of these languages provide access to the Microsoft .NET Framework, which includes a common execution engine and a rich class library. The .NET Framework defines a "Common Language Specification" (CLS), a sort of lingua franca that ensures seamless interoperability between CLS-compliant languages and class libraries. For C# developers, this means that even though C# is a new language, it has complete access to the same rich class libraries that are used by seasoned tools such as Visual Basic .NET and Visual C++ .NET. C# itself does not include a class library.

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Introduction C++ (Download Tutorial Pdf)

2009-06-02T17:44:00.000-07:00

C++ was developed by Bjarne Stroustrup of AT&T Bell Laboratories in the early 1980's, and is based on the C language. The "++" is a syntactic construct used in C (to increment a variable), and C++ is intended as an incremental improvement of C. Most of C is a subset of C++, so that most C programs can be compiled (i.e. converted into a series of low-level instructions that the computer can execute directly) using a C++ compiler.
C is in many ways hard to categorise. Compared to assembly language it is high-level, but it nevertheless includes many low-level facilities to directly manipulate the computer's memory. It is therefore an excellent language for writing efficient "systems" programs. But for other types of programs, C code can be hard to understand, and C programs can therefore be particularly prone to certain types of error. The extra object-oriented facilities in C++ are partly included to overcome these shortcomings.

Here is an example of a complete C++ program:

#include

int main()
{
int year_now, age_now, another_year, another_age;

cout << "Enter the current year then press RETURN.\n";
cin >> year_now;

cout << "Enter your current age in years.\n";
cin >> age_now;

cout << "Enter the year for which you wish to know your age.\n";
cin >> another_year;

another_age = another_year - (year_now - age_now);
if (another_age >= 0) {
cout << "Your age in " << another_year << ": ";
cout << another_age << "\n";
}
else {
cout << "You weren't even born in ";
cout << another_year << "!\n";
}

return 0;
}

More...
Download Tutorial

C Programming

2009-06-02T17:37:00.000-07:00

About C

As a programming language, C is rather like Pascal or Fortran. Values are stored in variables. Programs are structured by defining and calling functions. Program flow is controlled using loops, if statements and function calls. Input and output can be directed to the terminal or to files. Related data can be stored together in arrays or structures.

Of the three languages, C allows the most precise control of input and output. C is also rather more terse than Fortran or Pascal. This can result in short efficient programs, where the programmer has made wise use of C's range of powerful operators. It also allows the programmer to produce programs which are impossible to understand.

Programmers who are familiar with the use of pointers (or indirect addressing, to use the correct term) will welcome the ease of use compared with some other languages. Undisciplined use of pointers can lead to errors which are very hard to trace. This course only deals with the simplest applications of pointers.

It is hoped that newcomers will find C a useful and friendly language. Care must be taken in using C. Many of the extra facilities which it offers can lead to extra types of programming error. You will have to learn to deal with these to successfully make the transition to being a C programmer.

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Introduction OOP

2009-06-01T17:21:00.000-07:00

Object-oriented programming (OOP) is a programming language model organized around "objects" rather than "actions" and data rather than logic. Historically, a program has been viewed as a logical procedure that takes input data, processes it, and produces output data.

The concepts and rules used in object-oriented programming provide these important benefits:
The concept of a data class makes it possible to define subclasses of data objects that share some or all of the main class characteristics. Called inheritance, this property of OOP forces a more thorough data analysis, reduces development time, and ensures more accurate coding.
Since a class defines only the data it needs to be concerned with, when an instance of that class (an object) is run, the code will not be able to accidentally access other program data. This characteristic of data hiding provides greater system security and avoids unintended data corruption.
The definition of a class is reuseable not only by the program for which it is initially created but also by other object-oriented programs (and, for this reason, can be more easily distributed for use in networks).
The concept of data classes allows a programmer to create any new data type that is not already defined in the language itself.

More info ..