Yuva Developer

Chart Control in ASP.net

2011-04-06T14:34:00.000+05:30

Hi,

Here i am posting a very good example of Chart Control in ASP.Net.

How to open and Edit MSoffice document from C#.Net

2010-06-21T12:39:00.010+05:30

Hi,
Lots of people asking me how to open and edit MSoffice document from C#.Net.
Here i am giving you the way.

May you know all these and if have any better solution then comment me.

1. For just launching word. ( No need to specify the path of word exe)
Process.Start("Winword.exe");

2. For launching word with specifying file name.
Process.Start("Winword.exe", "My.doc");

If you want to create, edit any document file from C# Then follow these steps.

1. From Add reference add a COM reference.
2. Select "Microsoft Word 11.0 Object Library" Type lib version 8.3.
   ( It will vary upon library installed on your system)
   If you want to open and Edit Access, Excel files then add their respective libraries.
3. Now use the classes given by API for operating with files.

Here is a sample for word file..
--------------------------------------------------------------------------------
using Microsoft.Office.Interop.Word;
ApplicationClass WordApp = new ApplicationClass();
   object _fileName = "My.Doc";
   object _readOnly = false;
   object _isVisible = true;

   object missing = System.Reflection.Missing.Value;
   WordApp.Visible = true;

   //the number of parameter on open method will vary according to referenced object library version
   Document aDoc = WordApp.Documents.Open(ref _fileName, ref missing, ref _readOnly, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref _isVisible, ref missing, ref missing, ref missing, ref missing);
  aDoc.Activate();
==================================================

Free Online Exam / Certification

2010-06-09T17:45:00.001+05:30

Hello Friends,
After a long time i am again here with some new topic.
Today i am giving you some Free Online Exam link which are very helpful for certification and you knowledge.

Even i am also doing the same way to update myself.

If you have anymore link just comment me i will post over here.

1. RankSheet:- for .Net, java, Sql and all
   http://ranksheet.com
2. TestWorld:- for Microsoft, Cisco, Sun and all
     http://www.testsworld.com/
3. JavaBlackBelt:- for java and some editors
     http://www.blackbeltfactory.com/ui#TopicList
Thanks

.Net Obfuscator for securing your source code

2010-03-31T16:29:00.009+05:30

Hi Everyone,

The first priority and biggest challenge for any software developer is, How to secure application from re-engineering?

We know that the languages which are Interpreted can easily be re-engineered via Decompiler.

Even .Jar, .Class, .dll and .exe files can easily be decompiled which are created by Java and .Net.

What is Obfuscation?
Is the process of encrypting your .Net code so that it cannot be easily re-engineered.
It is language neutral technology even you can obfuscate java code too.
It is mainly used in managed languages because they can be re-engineered.

Then how to protect???

You can use Obfuscator for that. It just mangle your method, properties, classes and variables.

It means it change the name suppose your class name is Test, after obfuscator it may become ?dsghd.

So it cannot be easily understandable after decompilation.

Here i am putting some tools for protecting you code.

If you have anymore comment it, i will add.
Wait i will be posting the feedback of all the tools.(Currently i am testing with all the tools)

Convert Jar to Exe and Secure Java Application

2010-02-17T17:38:00.003+05:30

Hello Friends,

Hope you will see my previous post regarding the same.

Secure java files

Convert jar to exe

first of all Thanks for mailing me and your doubts.

Many people ask me question which one is best,secure and easy among them.

Actually many of them are developed on java itself.

So some time they just change the name of jar file to exe and it looks that we made it,

But originally you can extract it by changing its name again.

Best is use some commercial tool or Use tool which actually convert it into Win32 exe's.

I tried Excelsior that is commercial (think made in java) and jstart32 (Made in delphi) with
GNU license are tool which originally created a Win32.exe.

go and try...

Hope now you will feal secure.

Ask if any query or comment if you like.

Today i am posted some more tools to do so.

1. JStart32
http://jstart32.sourceforge.net/

2. JLaunch
http://www.magi-au.com/download/

3. Java Launcher
http://www.syncedit.com/software/javalauncher/index.html

4. Janel
http://www.redskaper.com/Janel.jsp

5. BuildDesk
http://www.productiveme.com/

6. Install Anywhere
http://www.flexerasoftware.com/

7. JExpress
http://www.denova.com/

8. Jar Compiler
http://www.tabbyinstall.com/jarc/JarCompiler.html

9. Inno Setup
http://www.jrsoftware.org/isinfo.php

Accessing Master Page Properties from Child Page

2010-01-30T15:51:00.005+05:30

Hello Friends.

Today hot topic is that how to access properties from MasterPage into content page.
I think there is several methods you can access those properties or variable.

1. By Master property of content page
2. By interface
3. By Including a MasterPage Directive in Pages.

So here i am providing you some code stuff for the same.
1. Access Master Page properties and Method by Master property of Page.

Master Page Code

   public string ButtonText
   {
   get { return this.Button1.Text; }
   set { this.Button1.Text = value; }
   }

Child Page Code

   //Master page is the name of master page file
   MasterPage mast = this.Master as MasterPage;
   if (mast != null)
   {
   mast.ButtonText = "New Text";
   }

-----------------------------------------------------------------------------------
2. Access Master Page properties and Via Interface.
see here
http://dotnetbyexample.blogspot.com/2007/10/right-way-of-accessing-master-page.html

Setting the wallpaper from C# code

2010-01-27T16:26:00.008+05:30

Hi Friends,

What if you want to change the wallpaper of your desktop from C#.Net. for that you have to use Unmanaged code.

You have to import and pass parameters to function from User32 dll.

Here I am posting the code for performing the same.

[DllImport("user32.dll", CharSet = CharSet.Auto)]

static extern int SystemParametersInfo(int Action, int Param, string lParam, int WinIni);

call the function and pass some useful parameters like ...

Bitmap bmp = new Bitmap(Image.FromFile(@"C:\mytest.jpg"));

bmp.Save("MyFile.Bmp", ImageFormat.Bmp);

SystemParametersInfo(20, 0, "pic.bmp", 0x1);

The first parameter 20 is for Wallpaper
Third parameter is your file path as String.
Last is Update parameter keep it 0X1, 0X01 | 0X02 ..

Note:- Here you see that I am converting the jpeg file into bmp file. Because it state that image should be 24 bits, so keep in mind the change of file else no effect of this function.

Handling Null value in case of value type.

2010-01-20T11:33:00.008+05:30

Hello friends,

As we can check for null values in case of Reference type.
What if want to do the same with value type.
Here the new feature of .net do it for you.

public int? x;
public int? X
{
get { return x; }
}

Now you can check
if( X != null) or if ( X == null)

Note:- Needed to be type cast to (int) where need int value.
Use:- Very usefull suppose you declared any field as integer in database table.
And you forget to declared default value as 0 (zero).
Then whenever you query to database you get a null value so it can be used for checking that.

Private setter for public getter

2010-01-20T11:12:00.003+05:30

Hello Friends,

Now i am showing you some very good features of Net 2.0 over .Net 1.0.

Suppose you want to expose a public property. So for that you have

public getter method but what about its setter method.
from .net 2.0 tou can have a private setter for a public getter too like this.

private int x;
public int X
{
get { return x; }
private set { x = value; }
}

Creating Non-Rectangular Form in C#

2010-01-11T11:02:00.005+05:30

Hello Friends,

Now here i am trying some very good stuff on C#.net.

The first in this row is creating non rectangular Form in C#.

The Idea comes when i was created Magnifier as a sub part of my project.

When i created a rectangular magnifier it's ok but when it comes to rounded then

i have to think.

From some book i get these idea (also available in many of GDI tutorials).

The idea behind this is that, GDI provides a new Class called GraphicsPath.

With the help of this class you can draw any closed arc, lines and shapes.

So either override onPaint event of form or Onload event put some code stuff like this.

System.Drawing.Drawing2D.GraphicsPath myShape = new System.Drawing.Drawing2D.GraphicsPath();

myShape.AddEllipse(0, 0, this.Width, this.Height);

this.Region = new System.Drawing.Region(shape);

Note:- You are not getting region property directly in intellisence because it is the

property of control class and here this refers the control.

Now in place of AddEllipse you can add any closed shape for your form.

Hope you enjoy....

Single Instance Application in C#

2009-10-14T13:13:00.009+05:30

Hello Friends,

Today I am discussing here a very HOT topic i.e. Single Instance in C#.

So friends, There are lots of ways to do so.

Some are very easy as 2-3 lines of code, some are big and complicated.

Just go through all of them.

Methods.

Using Process Name, ID etc.
By using Mutex class
By using Microsoft.VisualBasic.dll
By locking or binding a file.
By locking a particular port.

First Method:- Using Process class

Step1. Give your window form a specific unique name.

this.Text = “My_Application_144”; // title name

Step2. Create a private method for checking all Process title Text.

private bool IsAnotherInstance()

{

foreach (Process process in Process.GetProcesses())

{

//give particular name same as you given above

if (process.MainWindowTitle == this.Text)

return false;

}

return true;

}

Step3. On form load method check another instance

if (!IsAnotherInstance ())

{

MessageBox.Show("Application is Already running.");

this.Close();

}

I will disscuss other method next time.

==================================================
2. Using Mutex Class

[STAThread]

static void Main()

{

bool isNew = true;

using (Mutex mutex = new Mutex(true, "MyApplicationName", out isNew))

{

if (isNew)

{

Application.EnableVisualStyles();

Application.SetCompatibleTextRenderingDefault(false);

Application.Run(new Form1());

}

else

{

MessageBox.Show("Already running");

}

Question Related to .Net Technology.

2009-10-10T15:37:00.001+05:30

Hello Friends,

Now i am going to post some of very good question and Article regarding .Net.

Convert Colored Images to Black And white in java

2009-04-08T10:53:00.007+05:30

Hi,

Sometime you want to convert colored images to black and white.

Here i am giving you the simple method to do so.

Just see below.

//example for coverting colored image to black and white

import java.awt.image.*;

import javax.imageio.ImageIO;

import java.io.*;

import java.awt.*;

class BlackAndWhite

{

public static void main(String asr[])

{

try

{

//colored image path

BufferedImage image = ImageIO.read(new

File("D:\\MyProgram\\output.jpg"));

//getting width and height of image

double image_width = image.getWidth();

double image_height = image.getHeight();

BufferedImage bimg = null;

BufferedImage img = image;

//drawing a new image

bimg = new BufferedImage((int)image_width, (int)image_height,

BufferedImage.TYPE_BYTE_GRAY);

Graphics2D gg = bimg.createGraphics();

gg.drawImage(img, 0, 0, img.getWidth(null), img.getHeight(null), null);

//saving black and white image onto drive

String temp = "blackAndwhite.jpeg";

File fi = new File("D:\\My Program\\" + temp);

ImageIO.write(bimg, "jpg", fi);

}

catch (Exception e)

{

System.out.println(e);

}

Dashed line drawing in java graphics.

2009-03-31T12:39:00.011+05:30

Hello Friends,

While working in my project i was searching how to draw a dashed line

in Graphics not in Graphics2D.

So i get this code and it is superb for drawing dash lines or rectangulars.

Just pass the line points and assign your dash length and space length.

See the below function........

////pass the line point x1,y1 and point 2 as x2 and y2

public void drawDashedLine(Graphics g, int x1, int y1, int x2,

int y2, double dash_length, double space_length)

{

///if both the points are same

if ((x1 == x2) && (y1 == y2))

{

g.drawLine(x1, y1, x2, y2);

return;

}

///calculating line length

double linelength = Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));

double yincrement = (y2 - y1) / (linelength / (dash_length + space_length));

double xincdashspace = (x2 - x1) / (linelength / (dash_length + space_length));

double yincdashspace = (y2 - y1) / (linelength / (dash_length + space_length));

double xincdash = (x2 - x1) / (linelength / (dash_length));

double yincdash = (y2 - y1) / (linelength / (dash_length));

int counter = 0;

for (double i = 0; i < linelength - dash_length; i += dash_length + space_length)

{

g.drawLine((int)(x1 + xincdashspace * counter),

(int)(y1 + yincdashspace * counter),

(int)(x1 + xincdashspace * counter + xincdash),

(int)(y1 + yincdashspace * counter + yincdash));

counter++;

}

if ((dashlength + spacelength) * counter <= linelength)

g.drawLine((int)(x1 + xincdashspace * counter),

(int)(y1 + yincdashspace * counter), x2, y2);

}

=============================================

Closing command prompt from JAVA

2009-03-18T13:51:00.021+05:30

Hi,

Many times developer ask question how to close command prompt after
launching the application?
or
How to exit from batch file after execution.

Here is all possible ways to do so.
1. Use javaw.exe for launching your application and exit.
2. Create an executable jar file so that just double clicks for launch.
3. Create exe from jar files.

If you want to exit from command prompt after calling your exe file.
Then apply the same concept which we are using for tracing output
from exe.(see previous post)

Technique:-
1. You have to insert a line on your code which print "Loaded" on output.
2. Crate a jar file then exe from jar file.
3. Again make a java file for launching your exe file.
4. Get the InputStreamReader from your process.
5. Check for string "Loaded" on output.
6. If you get "Loaded" then exit.

See the full source code.

/* Program for closing a command prompt from a executable

* Code By:- Prashant Chandrakar*/

import java.io.*;

import javax.swing.JOptionPane;

import java.net.BindException;

class Loader

{

public static void main(String as[])

{

try

{

System.out.println("Loading application.........");

//pass the name of your exe in place of my.exe

Process p = Runtime.getRuntime().exec("my.exe");

//getting inputstream reader from process

BufferedReader reader = new BufferedReader

(newInputStreamReader(p.getInputStream()));

String line = reader.readLine();

//exit from this class when get "Loaded" from your application

while (line.equals("Loaded") == false)

{

line = reader.readLine();

}

reader.close();

}

catch (Exception e)

{

}

}
call exe from a batch file like...
java Loader

Tracing output from Exe in JAVA

2009-03-18T12:41:00.007+05:30

Hello Everyone,

Suppose you are creating a exe files from you jar files.

So while running how to trace the output of application.

Here i am putting very small code to do so.

The idea behind this is make a object of process and execute a exe from runtime object.

get a inputstream reader from process.

Then trace the output.

Just see below.

* Program for tracing a output from a executable

* Code By:- Prashant Chandrakar

import java.io.*;

import javax.swing.JOptionPane;

import java.net.BindException;

class Loader

{

public static void main(String as[])

{

try

{

//pass the name of your exe in place of my.exe

Process p = Runtime.getRuntime().exec("DicomViewer.exe");

//getting inputstream reader from process

BufferedReader reader = new BufferedReader(new

InputStreamReader(p.getInputStream()));

String line = reader.readLine();

while (line != null)

{

line = reader.readLine();

System.out.println(line);

}

reader.close();

}

catch (Exception e)

{

}

Reading command Line Input in JAVA

2009-03-09T17:17:00.007+05:30

Hi,

Developers migrating from c++ to java are first think of how

to pass command line input to java application or how to read command

line input in JAVA.

I am also worried on my early days of learning java.

So friends here I have some example to do so.

We can use BufferedReader class for that.

--------------------------------------------------------------------------------

import java.io.*;

public class ReadString

{

public static void main(String[] args)

{

// prompt the user to enter their name

System.out.print("Enter your name: ");

// open up standard input

BufferedReader br = new BufferedReader(new

InputStreamReader(System.in));

String userName = null;

// read the username from the command-line

try

{

userName = br.readLine();

}

catch (Exception e)

{

System.out.println(e);

}

System.out.println("UserName = " + userName);

}

======================================

Java 5.0 gives a new feature for reading inputs.

They launch java.uti.Scanner class, it gives more flexibility for reading

a input.

You can read from any file or you can search by a particular pattern.

import java.util.Scanner;

public class InputTest

{

public static void main(String as[])

{

String name = "";

int age = 0;

Scanner sc = new Scanner(System.in);

name = sc.nextLine();

age = sc.nextInt();

sc.close();

System.out.println("Name :-" + name);

System.out.println("Age :-" + age);

}

=======================================

Reading Command Promt Output from JAVA

2009-03-09T11:27:00.006+05:30

Hello Friends,

If sometimes you need reading a cmd.exe's output in java.

Here i am putting the code for doing that.

It is based on Buffered Readers's readLine() method.

But the point of attention is how to get your exe's InputStream.

See the snapshot in example i am reading a drive name from cmd.exe.

for the source code see below

* Program for reading a command prompt output from java

* Code By:- Prashant Chandrakar

import java.io.*;

public class cmdReader

{

public static void main(String arg[])

{

new test().setup();

}

void setup()

{

System.out.println("Testing getVolName");

////drive which name to be read

String path = "D:";

System.out.println("Volume name for " + path + " is: " + "'" + getDiskVolumeName(path) + "'");

}

public static String getDiskVolumeName(String path)

{

String volname = "Unknown";

String check = "Volume in drive " + path.charAt(0) + " is ";

try

{

//creating a process object and calling a cmd.exe with /c dir option

Process p = Runtime.getRuntime().exec("cmd /c dir " + path);

//getting input stream from a process

InputStreamReader is = new InputStreamReader(p.getInputStream());

//creating a buffered reader object for reading purpose

BufferedReader reader = new BufferedReader(is);

///reading a line

String line = reader.readLine();

while (line != null)

{

//getting substring for drive name

if (line.indexOf(check) != -1)

volname = line.substring(line.indexOf(check) + check.length());

line = reader.readLine();

}

catch (Exception e1)

{

System.out.println("Failure: " + e1.toString());

}

return volname;

}

Here below i am pointed the read text.

Snapshot:-

Reading custom field from Manifest file in JAVA

2009-03-06T18:40:00.007+05:30

Hi EveryOne,

If your PM tell you declare a version number for your application.

And if you declared application version number as constant in source code.

Then what happens when your application update and version number should be change?

What will you do, again change in source code, then compile, then create jar etc?

It is not just a case where your constant need to update.

i have a solution.

Just add a field on manifest file. And read these fields from your code.

Here i am putting a example code to do so.

It is very easy. You can read all fields from manifest.

For source code see below.

* Program for reading a field from manifest file

* Code By:- Prashant Chandrakar

* */

import java.io.*;

import java.util.*;

import java.util.jar.*;

import java.net.*;

public class JarRead

{

public static void main(String[] args) throws Exception

{

new JarRead().call();

}

public void call()

{

try

{

////pass your jar file name which included manifest file

JarFile jf = new JarFile("CDViewer.jar");

////getting manifest file from jar file

Manifest m = jf.getManifest();

////getting all attribute from manifest file

Attributes attr = m.getMainAttributes();

////taking values from manifest file.

////existing field

String SOFTWARE_VERSION = attr.getValue(Attributes.Name.IMPLEMENTATION_VERSION); // 2.0

String SOFTWARE_VENDOR = attr.getValue(Attributes.Name.IMPLEMENTATION_VENDOR); // YuvaDevelopers Pvt.Ltd.

String SOFTWARE_VENDOR_TITLE = attr.getValue(Attributes.Name.IMPLEMENTATION_TITLE); // ManifestReader

////custom defined field

String dType = attr.getValue("RunType");

System.out.println(SOFTWARE_VERSION + "\n" + SOFTWARE_VENDOR + "\n" + SOFTWARE_VENDOR_TITLE + "\n" + dType);

}

catch(Exception e)

{

System.out.println(e);

}

Manifest file:-

Manifest-Version: 1.2

Main-Class: JarRead

Created-By: 1.4 (Sun Microsystems Inc.)

Specification-Title: build57

Specification-Version: 1.0

Specification-Vendor: Sun Microsystems, Inc.

Implementation-Title: Manifest Reader

Implementation-Version: 1.0.0

Implementation-Vendor: YuvaDevlopers Pvt.Ltd.

RunType: Customfield

Just save as manifest.mf file and add while creating jar file.

Secure your class files in JAVA

2009-03-04T13:02:00.017+05:30

Hello Friends,

As you seen in my previous post, there I had posted too many tools that re-engineer your class files.

So today's java developer most worried question is how to secure class files to become reverse Engineering.

Don't Worry friends,

There are too many tools to protect your class files.

There are many methods to protect your class files.

Obfuscator
Manglers
jar To Executer

Obfuscator:-

The technique behind Obfuscator is they encode your class files with certain encryption algorithm and while execution your application they again decoded or decrypted.

So other than obfuscator know body knows which encryption algorithm is used for encoding so you are unable to decode the class files.

I have used many of them and believe me they are very good.

1. JShrink
http://www.e-t.com/jshrink.html

2. BLOAT
http://sss.cs.purdue.edu/?

3. Dash O
http://www.preemptive.com/dasho-java-obfuscator.html?

4. JARG
http://sourceforge.net/projects/jarg/?

5. JAX
http://www.alphaworks.ibm.com/tech/JAX?

6. Jcloak

http://www.force5.com/JCloak/ProductJCloak.html?

7. JODE

http://jode.sourceforge.net/

8. Zelix Klass Master

http://www.zelix.com/klassmaster/?

9. Marvin

http://drjava.de/obfuscator/?

10. ProGuard

http://proguard.sourceforge.net/?

11. RetroGuard

http://www.retrologic.com/?

12. Shroudit

http://www.lnk.com/products.htm?#shroudit

13. Smokescreen

http://www.leesw.com/?

14. Saffeine

http://www.saffeine.com/?

15. Code Shield

http://www.codingart.com/codeshield.html?

16. Java Guard

http://sourceforge.net/projects/javaguard/?

17. yGuard

http://www.yworks.com/en/products_yguard_about.htm?

18. Jobfuscator

http://www.duckware.com/jobfuscate/index.html

19. Jasob

http://www.jasob.com/

20. Crema

Not found

21. Hashjava

Not found
22. Allatori
http://www.allatori.com/

Manglers:-

There are also some Manglers available which mangle your class

files code. It is also protect your classes but up to certain limit.

It applies the technique of mangling function, variable names, class

names, interface name etc.

Below is the list of Manglers.

1. Mangle-it
http://www.download3k.com/Software-Development/Editors-Tools/Download-Mangle-It-Java-Source-Code-Obfuscator.html

2. jmangler
http://www.elegant-software.com/software/jmangle/

Jar To Exe :-

Just make a jar file from your class files.

And make exe file from your jar file.For creating exe from jar files please refer my previous post there i had posted number of tools for that.

http://yuvadeveloper.blogspot.com/2009/03/convert-jar-files-to-exe.html

Java Decompilers (.class to .java file)

2009-03-03T16:03:00.011+05:30

Hello friends,

Its a very sensational news for all who dont know how to convert .class files to .java files or decompilation of class files.

Sometime we need to decompile our class files back to java source files.

So which are the tools available?

Don't worry friends probably i have list of all the decompilers available in market.

If i forget any tool or you have any idea other than these please share with me.

I test many of the tools and some of having certain limitation.

See below is the list of all the decompilers.

The first three are very demanded in market and they are very good too.

1. JODE

http://jode.sourceforge.net/

2. Mocha

http://www.brouhaha.com/~eric/software/mocha/

3. DJ
http://members.fortunecity.com/neshkov/dj.html

4. cavaj

http://www.bysoft.se/sureshot/cavaj/

5. JAVA Decompiler(JD)
http://java.decompiler.free.fr/

6. SourceTech

http://www.sothink.com/product/javadecompiler/?

7. HomeBrew
http://www.pdr.cx/projects/hbd/?

8. Jdec
http://jdec.sourceforge.net/

9. Dava
http://www.sable.mcgill.ca/dava/

10. JreversePro
http://jreversepro.blogspot.com/

11. class Cracker
http://mayon.actewagl.net.au/index.html

12. JADO
http://sourceforge.net/projects/dcompiler

13. Jasmine Decompiler
http://www.jreveal.org/

14. SourceAgain
http://www.ahpah.com/products.html

15. Jascii
http://www.zdnet.com.au/downloads/0,139024478,10227092s,00.htm

http://www.download.com/jAscii/3000-2213_4-10227093.html http://asia.cnet.com/downloads/pc/swinfo/0,39000587,50002586r-39063864s,00.htm

16. JADClipse

http://sourceforge.net/projects/jadclipse/?

17. bytecoding
http://sourceforge.net/projects/bytecoding/?

18. javad

http://www.bearcave.com/software/java/javad/index.html

===============================================

Online Tools

-----------------------------------------------------------------------------------

19. Online DEC
http://www.tigernt.com/tools/Java/index.shtml?

===============================================

Old Tools (May Link Broken)

------------------------------------------------------------------------------------

20. JAD
http://www.kpdus.com/jad/winnt/jadnt158.zip

21. WingDis
http://www.wingsoft.com/

22. DejaVu
23. class Spy
24. NMI

Convert JAR files to EXE

2009-03-02T12:24:00.017+05:30

Hello Everyone,

The most worried things in java world is how to save your code from decoding.

As you all know that there are certain tools which decode or convert your .class file code to .java files.

So how can you save your code.Solution is make a exe or Executable for windows user.

If you want for window OS then here i am listing all the tool for converting jar files to exe Executable.

These tools are also used for deployment purpose or setup maker.

I used many of them and they are superb.

1. Excelsior JET

http://www.excelsior-usa.com/jet.html

2. JSmooth

http://jsmooth.sourceforge.net/

3. Launch4j

http://launch4j.sourceforge.net/

4. Install4j

http://www.ej-technologies.com//products/install4j/overview.html

5. Exe4j

http://www.ej-technologies.com/products/exe4j/overview.html

6. IzPack

http://izpack.org/

7. JExecreater

http://www.ucware.com/jexec/index.htm

8. ExeJ

http://www.sureshotsoftware.com/exej/

9. Executer

http://mpowers.net/executor/

10. Jar2Exe

http://www.regexlab.com/en/jar2exe/

11. Advace Installer

http://www.advancedinstaller.com/

12. JExePack

http://www.duckware.com/jexepack/index.html

13. Xenoage

http://www.xenoage.com/jestart.html

14. NativeJ

http://www.dobysoft.com/products/nativej/

15. JNC

http://jnc.mtsystems.ch/

Layout Managers in JAVA

2009-02-28T13:11:00.008+05:30

Hi friends,

While setting Layout in JAVA application, everyone is just

thinking of some common layouts. They are...

FlowLayout
BorderLayout
GridLayout
GridBagLayout
Card Layout
Null Layout or Absolute Positioning.

But they all are belongs to Java.awt.classes

But Swing introduces some of very new and intresting types of

layouts.

They are...

BoxLayout
GroupLayout
OverlayLayout
SpringLayout
ScrollPaneLayout
ViewPortLayout

So friends here i am discussing about all.

Null Layout or Absolute Positioning in JAVA

2009-02-28T12:44:00.012+05:30

Hi freinds,

Most of the time every developer is thinking which layout is to be set.

So that all the added component (like button,Text box etc.) can not

affect while resizing the JFrame or their container.

So we that there are number of layout to do so.

And for many of the users GridBagLayout is best for their work.

But many of the user also feel that it is some difficult and takes too

much lines to code.

So my dear friend use NullLayout which kept is sort and sweet.

On this layout you can easily choose X, Y postion and also width and

height of your particular component.

See the snapshot you can also put button overlapping.

Same as other component.

It is not a Layout Manager and not need to add like others.

just setLayout(null); will add this to your component.

I am created a very simple application which implement this method.

just go through it.

For source code see below

* Program for setting null layout or absolute positioning

* you can put button over another button

* Code By:- Prashant Chandrakar

import java.awt.*;

import javax.swing.*;

import javax.swing.plaf.synth.*;

public class NullLayout extends JFrame

{

NullLayout()

{

super("Null Layout Prashant Chandrakar");

try

{

JFrame.setDefaultLookAndFeelDecorated(true);

this.getContentPane().setBackground(Color.GRAY);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel uname = new JLabel("UserName");

JLabel pword = new JLabel("Password");

JTextField utxt = new JTextField(20);

JTextField ptxt = new JTextField(20);

this.setLayout(null);

////by using this method set the x,y ,width ,height

uname.setBounds(40, 27, 100, 25);

utxt.setBounds(150, 27, 100, 25);

pword.setBounds(40, 70, 100, 25);

ptxt.setBounds(150, 70, 100, 25);

this.add(uname);

this.add(utxt);

this.add(pword);

this.add(ptxt);

JButton btsave = new JButton("SAVE");

JButton btcancel = new JButton("CANCEL");

btcancel.setBounds(120, 127, 104, 25);

btsave.setBounds(100, 107, 104, 25);

this.add(btsave);

this.add(btcancel);

}

catch (Exception e)

{

System.out.println(e);

}

this.setSize(350, 200);

this.setVisible(true);

}

public static void main(String[] args) throws Throwable

{

new NullLayout();

}

Snapshot:-

Single Instance Application in JAVA

2009-02-26T12:34:00.012+05:30

Hello Friends,

One of the most asking question in java world is how to make java

application as a single instance.

I google it and found many of the techniques.

I am posted here some of popular techniques.

Just go ahead and contact if you have problem......

1. By capturing port or through ServerSocket (short code) .

On this method we are creating a object of java.net.ServerSocket class.

And by passing a port number we are captured while first instance so

that if another instance occurred it is throwing a bind Exception and

you can tracked that any more instance is running on system.

Just see the link for code

http://yuvadevelopers.dmon.com/java_examples/Single_Instance_small.htm

2. By capturing port or through ServerSocket (Big code).

It is same as the first method but while google i got this big code with

different option just go through the code.

Just see the link for code

See the original source here get from google

http://www.rbgrn.net/blog/2008/05/java-single-application-instance.html

3. By accessing file from local file system.

This is also another method for doing the same thing.

But it is not that much preferable because sometime when JVM

crashes or due to some IO error occured then file is not deleted

from hard disk.

note:- Dont put your file (you can use any file) in C drive or where OS exist.

Just see below for code

* Program for setting single instance in JAVA

* Code By:- Prashant Chandrakar

import java.net.ServerSocket;

import javax.swing.JOptionPane;

import javax.swing.JFrame;

import java.io.IOException;

import java.net.BindException;

class SingleInstance

{

public static ServerSocket serverSocket;

public static String errortype = "Access Error";

public static String error = "Application already running.....";

public static void main(String as[])

{

try

{

//creating object of server socket and bind to some port number

serverSocket = new ServerSocket(15486);

////do not put common port number like 80 etc.

////Because they are already used by system

JFrame jf = new JFrame();

jf.setVisible(true);

jf.setSize(200, 200);

}

catch (BindException exc)

{

JOptionPane.showMessageDialog(null, error, errortype, JOptionPane.ERROR_MESSAGE);

System.exit(0);

}

catch (IOException exc)

{

JOptionPane.showMessageDialog(null, error, errortype, JOptionPane.ERROR_MESSAGE);

System.exit(0);

}

4. By using java sun.jvmstat package from tools.jar.

Just see the link for code

5. By using Launch4j application.

It is a third party tools for creating a EXE for your application.

It is giving you a facility of creating single instance application.

Just try it. It is perfect tool.

Just see the launch4j application doc

http://launch4j.sourceforge.net/