Make bootable USB of Windows Server 2012, 2016 or Technical Preview edition.

Making bootable USB of Microsoft Windows Server 2016, 2012 or technical preview edition is not so easy as making as other versions of OSs, what I have faced till now. It give error like "Windows cannot open the required file D:\Sources\install.wim. Make sure all file required for installation are available and restart the installation. Error code: 0x80070026" during the installation.

Let see how can get rid of this problem.

Requirements :- 

• ISO file of OS.
• USB pen drive (at least 8 GB).
• WinRar or 7zip extraction tool.

Caution: The following commands will completely erase your disk without any warning, so be sure that you select proper disk. Disconnect other external drives and keep back up of all your data 

1. Now keep ready your Windows ISO file.
2. Insert your USB disk in computer system (Should not be less than 8 GB).
3. Now open command prompt in elevated mode means "Run as administrator" (Right click on command prompt and select "Run as administrator").

4. Now type diskpart on command prompt. It will open diskpart utility.

5. Now type list disk. It will show all drives attached with your system.

6. Now type select disk ? (at ? put disk id like 0 or 1, you can identify your USB drive here by size). In  my case the complete command is select disk 1.

7. Again run list disk command to check  whether you have selected proper disk or not. Selected disk will be pointed by * mark.

8. Now run clean command (it will erase every thing on USB disk).

9. Now create partition primary

10. Then select partition 1

11. Make it active by typing active

12. Then format this disk using command

       format fs=ntfs quick label="2016server"

      label could be anything.

13. Now exit from DISKPART utility by typing exit.

After exit from DISKPART you will be again on command prompt. 

Now extract your Windows ISO image on USB drive by the help of WinRAR or any other tool.

(Right click on ISO then select Open with and select WinRAR. After that click on Extract to then select your pen drive path.)

After extracting ISO on USB Drive.

1. Go to USB drive by typing drive letter (in my case drive letter is F).

     F:

2. Now type cd boot

3. Then type bootsect /nt60 e:

output of this command should be look like "Bootcode was successfully updated on all targeted volumes".

4. Now run command xcopy F:\*.* D:\/E/H/G (F:\*.* - F is my USB drive letter, you put yours here).

Copy of install.wim file will take a long time. Please wait here, it is too large file.

After finishing copy, you will be able to install Windows server 2016.

Compiled from:- http://itproguru.com/expert/2016/05/create-bootable-windows-server-2016-usb-thumb-drive-for-installing-os/

Expand and Collepse Div on Mouse Click

Expanding and Collapsing Div is a very cool effect in HTML using CSS and JavaScript. If we want to don't show any information on first look, but on click then we can use it, or you can use it on your relevancy and suitability. Let see, how it can be implemented.

CSS for design the div :-

<style>
.exp_div_wrapper    
{
        
}

#exp_div_wrap 
{
    margin-top: 0px;  
    margin-bottom: 30px; 
    background: green;
    width: 90%; height: 50px;
kit-border-bottom-right-radius: 15px;
    -webkit-border-bottom-left-radius: 15px;
    -moz-border-radius-bottomright: 15px;
    -moz-border-radius-bottomleft: 15px;
    border-bottom-right-radius: 15px;
    border-bottom-left-radius: 15px;
}

#exp_div_wrap_toggle 
{
    display: block;
    width: 100%;
    height: 35px;
    line-height: 35px;
    background:#9999FF;
    text-align: center;
    color: white;
    font-weight: bold;
    font-variant: small-caps;
    box-shadow: 2px 2px 3px #888888;
    text-decoration:none;
}

#exp_div_wrap_toggle:hover 
{
    text-decoration:none;
    border-top: 1px groove white;
    border-left: 1px groove white;
    border-bottom: 1px solid #7B7B78;
    border-right: 1px solid #7B7B78;
    color: #663200;
    background:#FF66FF;
    box-shadow: 1px 1px 2px #888888;
}
</style>

You can change the div design by making change in above CSS.

Now the HTML used for creating div is :-

<div class="exp_div_toggle_wrapper">
  <a href="#0" id="exp_div_wrap_toggle">Expand Div</a>
</div> 
<center><div  id="exp_div_wrap" style="display: none;">
</div></center>

and below this HTML, use JQuery/JavaScript

<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript">
jQuery(document).ready(function($)
{
  
  $("#exp_div_wrap_toggle").click(function()
  {
    
    $("#exp_div_wrap").slideToggle( "slow");
    
  if ($("#exp_div_wrap_toggle").text() == "Expand Div")
      {
        $("#exp_div_wrap_toggle").html("Hide Div")
      }
  else 
      {
        $("#exp_div_wrap_toggle").text("Expand Div")
      }
    
  });  
  
});
</script>

Screenshot is given below:-

How to authenticate a user and create session in PHP ?

User authentication is very essential part of any web application. There may be many kind of user authentication are available in web technology, but form based user authentication is very common and secure.

Now here I am telling about form based user authentication in PHP and session creation. Here I pre- assume that you all are aware of database, and pre-requisite is a user table with user data. it may be like this -

Now I also assume that you know that how to create login form and perform a action on it. But again I am giving screen shot of login page code and its output.

output looks looks like -

Above is database design and form design.

Now come to the PHP programming, how would you authenticate the user and create a session for him?

Here is the full code to authenticate user and create his session.

<?php

session_start();

// Connect to server and select databse.

  $host="localhost";// Host name

  $username="root";// Mysql username

  $password="aarvindd";// Mysql password

  $db_name="e-cert";// Database name

  $con=mysqli_connect("$host", "$username", "$password")or die("cannot connect");

  mysqli_select_db($con,"$db_name")or die(mysqli_error());

// To protect MySQL injection(<a href="http://us.php.net/mysql_real_escape_string">more detail about MySQL injection</a>)

   $myusername = mysqli_real_escape_string($con,$myusername);

  $mypassword = mysqli_real_escape_string($con,$mypassword);

if (isset($_POST['Submit'])) {

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";

  $result=mysqli_query($con,$sql);

  

// Mysql_num_row is counting table row

  $count=mysqli_num_rows($result);

    

  // If result matched $myusername and $mypassword, table row must be 1 row

if($count==1){

// create session

 $_SESSION['user'] =$myusername;

//redirect user to his page

  header("location:adminhome.php");

}

  else {

  header("location:index.php?ll=Invalid Credentials, please try again.");

  }

  }

  

  ?>

> Manifest merger failed: uses-sdkminSdkVersion 9 cannot be smaller than version 14 declared in library [com.android.support.apcompat-v7:26.0.0-alpha1] Android Studio

This kind of error you get when you select lower SDK version and you are using library which required higher version. This is the very basic error which occurs when you start a new project.

When you select very low minimum SDK requirement on "target android device window" of Android Studio, such kind of error occurs. You may resolve this in two ways -

1. Since these problem occurs during the start a new project, so you can restart a new project with some higher minimum SDK. See the screen shot -

2. But if you don't want to restart a new project and you want to resolve it in existing project, then open the build.gradle(Module app) file of your project and find the following value-

minSdkVersion 9

then change it to -

minSdkVersion 14

And then sync the project. screen shot is below-

Resolve java.lang.StringIndexOutOfBoundsException while getting substring in Java

Getting substring in Java is very easy. But when we don't  know the size of string or string size is variable, then it becomes difficult.

When I was working a project and I had to get the substring of 10 char long to display on page and this string was coming from database and I didn't know the length of this string and some times this string was less than 10 character.

So it was obvious to get the exception like "java.lang.StringIndexOutOfBoundsException: String index out of range: 10"

Then I started to search the solution for this. After a long search I could not find the simple one line solution to fix this. Every or many solution was based on to first find the null and then get the substring.

But I found the one line solution on stackoverflow by a user linqu.

Solution is given below :-

Suppose I have a string arvind and I want to get a substring of 10 character

class SubStr
{
public static void main(String ar[])
{
String s="arvind";
System.out.println(s.substring(0,10));
}
}

then it will give error like -

So one line solution is -

System.out.println(s.substring(0,Math.min(10, s.length())));

Create dropdown menu in navigation bar in HTML and CSS

Creating navigation bar on web page which looks like drop down menu on mouse over is an essential part of web development. It can be developed by using CSS and HTML.

Here is the example code of this :-

Following CSS has used  for style and design, You may change the colour and font according to you. 

nav {
  background-color:;
  height:30px;
}

nav ul {
  font-family: Arial, Verdana;
  font-size: 15px;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav ul li {
  display: block;
  position: relative;
  float: left;
}

nav li ul {
  display: none;
}

nav ul li a {
  display: block;
  text-decoration: none;
  padding: 7px 15px 3px 15px;
  background:;
  color: ; 
  margin-left: 1px;
  white-space: nowrap;
  height:20px; /* Width and height of top-level nav items */
  width:auto;
  text-align:center;
 }

nav ul li a:hover {
  background:#FBEFEF;
}

nav li:hover ul {
  display: block;
  position: absolute;
  height:20px;
}

nav li:hover li {
  float: none;
  font-size: 11px;
}

nav li:hover a {
  background:#E0F8F7 ;
  height:20px; /* Height of lower-level nav items is shorter than main level */
}

nav li:hover li a:hover {
  background: #95A9B1;
}

nav ul li ul li a {
    text-align:left; /* Top-level items are centered, but nested list items are left-aligned */
}

/* END NAV MENU */

Now here is the HTML code to create navigation bar.

<nav>
    <ul>
      <li><a href="adminhome.php">Home</a></li>
      <li><a href="">Event &dtrif; </a>
        <ul>
            <li><a href="stregister.php">New Registration</a></li>
     <li><a href="viewreg.php">View Registration</a></li>
            <li><a href="">Update Registration</a></li>
            <li><a href="">Delete Registration</a></li>
<li><a href="searchreg.php">Search Registration</a></li>
<li><a href="addevent.php">Add Event</a></li>
<li><a href="">Edit Event</a></li>
<li><a href="">Delete Event</a></li>
<li><a href="">Search Event</a></li>
        </ul>
      </li>
 
  <li><a href="/services">Project &dtrif; </a>
        <ul>
<li><a href="proj_reg.php">New Registration (Project)</a></li>
             
        </ul>
      </li> 
      <li><a href="/products">E-Certificate &dtrif; </a>
        <ul>
            <li><a href="get-cert1.php">Generate e-certificate</a></li>
<li><a href="get-cert-proj.php">Generate e-certificate (Project)</a></li>
            <li><a href="">View e-certificate</a></li>
<li><a href="checkstatus.php">Check Status</a></li>
        </ul>
      </li>
      <li><a href="/services">Reports &dtrif; </a>
        <ul>
            <li><a href="report-dept.php">Department-wise</a></li>
<li><a href="">Event-wise</a></li>
<li><a href="">Year-wise</a></li>
<li><a href="">Course-wise</a></li>
<li><a href="">Sem.-wise</a></li>
<li><a href="">All</a></li>
         
        </ul>
      </li>         
 
<li><a href="/services">Data &dtrif; </a>
        <ul>
            <li><a href="uploadexcel.php">Upload Data From Excel Sheet</a></li>
<li><a href="">Delete Data</a></li>
<li><a href="">View Data</a></li>
<li><a href="">Search Data</a></li>
       
        </ul>
      </li>         
      <li><a href="/contact">Profile &dtrif; </a>
        <ul>
            <li><a href="/email">Reports</a></li>
         
        </ul>
      </li>
   <li><a href="/contact">Site Map</a>
        <ul>
                   
        </ul>
      </li>
    <li><a href="/contact">FAQ</a>
        <ul>
                 
        </ul>
      </li>
    </ul>
</nav>

How to take screen shot of a system and save it to database in Java ?

To view any user's desktop in network or any organisation, there are many paid or may be free software is available. But if you want to develop your own software, you can develop into Java.

Here is the example code in which I have used MYSQL database to save screen shot. This example will save new image to database of given system and if image already exists of given system then it will update the table.

If you are familiar with database connectivity in JAVA, you know that we require database driver- i.e. also known as mysql_connector.jar file to make database connectivity.

You can download this jar file from here.


import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.*;
import java.sql.*;
import javax.imageio.ImageIO;

public class TakeShot {
    
    public void shot()
    {
      try {

//To capture image
            Robot robot = new Robot();
// put the desired filename and file extension
            String format = "png";
            String fileName = "fscshot." + format;
  // get the screen size and image of screen           
            Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
            BufferedImage screenFullImage = robot.createScreenCapture(screenRect);
            ImageIO.write(screenFullImage, format, new File(fileName));
 //Save file to disk          
            File file=new File("fscshot.png");
            FileInputStream fis=new FileInputStream(file);
  //         
            System.out.println("A full screenshot saved!");
 //get ip address  of system
            InetAddress IP=InetAddress.getLocalHost();
            String ipadd=IP.getHostAddress();
System.out.println("IP of my system is := "+ipadd);
//Database connectivity
            PreparedStatement ps=null;
            Class.forName("com.mysql.jdbc.Driver");
            Connection con=DriverManager.getConnection("jdbc:mysql://localhost/lenser","root","");
            Statement stm=con.createStatement();
// check image is already saved in database then update image

            String sql="select ip from scshot where ip='"+ipadd+"'";
            ResultSet rs=stm.executeQuery(sql);
            if(rs.next())
            {
String ipp=rs.getString("ip");
System.out.println(ipp);
if(ipp.equals(ipadd)==true)
{
System.out.println("ipfound");
                                         ps=con.prepareStatement("update scshot set shot=? where ip='"+ipadd+"'"); 
                                       // ps.setString(1,ipadd);
                                        ps.setBinaryStream(1,fis,(int)file.length());
                                        ps.executeUpdate();
}
}
//if there is no image exist of IP address the insert new image
else
{
System.out.println("ipnotfound");
        ps=con.prepareStatement("insert into scshot (ip,shot) values(?,?)"); 
ps.setString(1,ipadd);
ps.setBinaryStream(2,fis,(int)file.length());
ps.executeUpdate();
}

            rs.close();
            ps.close();
            fis.close();
            con.close();
        } catch (Exception ex) {
            System.out.println(ex);
        }
    }
    
}