Fun

What happened to my vacations

sonam — Wed, 22 Jul 2009 05:20:28 GMT

College is opening tommorow and I am thinking what i have done in past 1 and half months of vacations.

The only thing i can remember is bluz,my open source project.
Where is that p2p thing i decided earlier?
All the research papers about skype,overlay networks ,guntella etc are lying there on disk as it is.i have read them only once.I have read not understood..

The positive side of vacations is:
1)I learned a lot about WPF,Blend etc.
2) I am participating in win7 contest based on above experience.
3)I met shaun,my new co-developer of bluz..
4)I have got some books of ASP.Net by bill ,scott and WPF book by Mathew macdonald..

And now i have some web 2.0 ideas that i hope to implement as a way of parcticing this ASP.net stuff.Thats a business idea,So you might see something interesting on web soon.

So,If i look back that way,I think it was more rewarding than any of internship i could get.

Now ,its my last year of graduation,My targets include:
1)Enjoy it fully.I know thats hard but i'll have to make this year remeberable .
2)Implement business ideas.(I love making money in humanatic way).
3)Make final year Project.
The 3rd one is where i'll cut my efforts ,Becoz i don't think that really matters as compared to my learning.Also,I don't see potential partners for a cool. .Net team to make a cool project at the college.

cya guys,
cheers

New Open Source Project-Bluz(Next Generation Media Player)

sonam — Wed, 15 Jul 2009 20:49:56 GMT

hi guys.

I have just released a pre beta release of next generation media player bluz.

Link is here:

http://code.google.com/p/bluz/

Its based on vlc libraries and bass and a couple of others for various tasks.
Its in c#,WPF but if any of you would like to contribute through any means.
The UI is purely in XAML,I am not a good designer,Even all icons are made in XAML.
.
If any of you would like to contribute through coding various modules or helping me develop the website,it would be nice of you to make it a hit on windows OS.

Atleast,U guys can check out and report any bugs you find to me directly..

It requires .Net 3.5
Have a nice day.

Screenshots:

I got task for summers:Study p2p architectures

sonam — Sun, 03 May 2009 12:14:44 GMT

This is in continuation to my last post in which i was confused of "what to do in summers".
After a lot of thinking,I have got the answer.
I'll study/research on "p2p architectures and there use in enterprises"...Lets see how it goes,i have semester exams next week and i have downloaded a lot of books/technical papers to get started. ..

p2p will help me distinguish my music player from others in the market...

I'll also look at using the p2p library "Brunet" which is not much publicized as gnutella ...You can see the work here:.
.
http://github.com/johnynek/brunet/tree/master

Its a work by Sir ,Oscar BoyKin at UCLA(University of California)..For a weath of softwares and knowledge/he blogs at:
http://boykin.acis.ufl.edu/

I'll make my player a true web 2.0 social app..doing some homework in p2p architectures will be good for my summers...

And I'll keep posting tuts/links or any cool things that i'll encounter in my p2p research.I am really excited for it.

Have a happy coding.

What to do in summer?

sonam — Thu, 16 Apr 2009 16:24:34 GMT

I am a Computer science student and there is a big Question mark of what i'll do in summers.
Ofcourse,I have some projects to do ,But even then i would like to get some internship.A fun and learning opportunity at the same time,i can earn too..

But this recession has really affected my internship hopes..
Companies like Microsoft,Google are giving paid internships to Phd Students only and i am a pursuing undergraduate from not so famous college.
..And they require some big references which i am not having.

What may be other cooler options..?Let me think over it ..hmmm..

ListView DragDrop in WPF,multiselect

sonam — Tue, 03 Mar 2009 05:46:27 GMT

After going through the web ,I haven't got anything that i can use directly to enable drag drop between two listview controls or within same for multiple items.
The best thing available in my opinion is this one by Josh smith:
http://www.codeproject.com/KB/WPF/ListViewDragDropManager.aspx

But it is for single SelectionMode only

Another one for multiselct is this:
http://www.codeproject.com/KB/WPF/WPF_MultiSelect_DragDrop.aspx
But the second one has many limitations..
So i have done some work to extend it from there..
I don't have much time in near weeks to work on this ,So it is not that much well written.
But it will serve as the good to get u one what u want during drag drop in more graceful way....

The code is as follows:

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Text;
using System.Windows.Controls;
using System.Windows;
using System.Windows.Media;
using System.Windows.Controls.Primitives;
using System.Collections.ObjectModel;
using System.Reflection;
using System.Diagnostics;
namespace DragDropManager
{
   public class DragDropManager<T> where T:class,ICloneable
   {

        ListView listView;

       // delegate for GetPosition function of DragEventArgs and
       // MouseButtonEventArgs event argument objects. This delegate is used to reuse the code
       // for processing both types of events.
       delegate Point GetPositionDelegate(IInputElement element);

       public DragDropManager(ListView listView)
       {
           this.listView = listView;
           listView.PreviewMouseLeftButtonDown += new System.Windows.Input.MouseButtonEventHandler(listView_PreviewMouseLeftButtonDown);
           listView.Drop += new System.Windows.DragEventHandler(listView_Drop);
       }

       void listView_Drop(object sender, DragEventArgs e)
       {
           int index = this.GetCurrentIndex(e.GetPosition);

           if (index < 0)
               return;

           Dictionary<int,T> draggedItems = e.Data.GetData(typeof(Dictionary<int,T>)) as Dictionary<int,T>;

        if(sender==this.listView)

            this.listView.SelectedItems.Clear();

       int i = 0;

         ObservableCollection<T> itemsSource= this.listView.ItemsSource as ObservableCollection<T>;

           // finally insert the items into the source collection
         T dropTarget = itemsSource[index];

         if (draggedItems.ContainsValue(dropTarget)) return;


          foreach(int key in draggedItems.Keys)
          {
              T draggedItemClone = draggedItems[key].Clone() as T;
              itemsSource.Insert(index + i, draggedItemClone);


              i++;

          }


       }

       void listView_PreviewMouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
       {

           int index = this.GetCurrentIndex(e.GetPosition);

           if (index <0) return;

           // this will create the drag "rectangle"
           DragDropEffects allowedEffects = DragDropEffects.Move;

           if (this.listView.SelectedItems.Count == 0)
               return;

           Dictionary<int,T> draggedItems = new Dictionary<int, T>();



           foreach(T draggedItem in this.listView.SelectedItems)
           {
            draggedItems[this.listView.Items.IndexOf(draggedItem)] = (draggedItem as T);

           }

           T item = this.listView.Items[index] as T;

           if (!draggedItems.ContainsValue(item))
                     return;

           DragDrop.DoDragDrop(this.listView, draggedItems, allowedEffects);

       }
       ListViewItem GetListViewItem(int index)
       {
           if (this.listView.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)
               return null;

           return this.listView.ItemContainerGenerator.ContainerFromIndex(index) as ListViewItem;
       }

       // returns the index of the item in the ListView
       int GetCurrentIndex(GetPositionDelegate getPosition)
       {
           int index = -1;
           for (int i = 0; i < this.listView.Items.Count; ++i)
           {
               ListViewItem item = GetListViewItem(i);
           if (this.IsMouseOverTarget(item, getPosition))

               {
                   index = i;
                   break;
               }
           }
           return index;
       }

       bool IsMouseOverTarget(Visual target, GetPositionDelegate getPosition)
       {
           if (target == null)
               return false ;
           Rect bounds = VisualTreeHelper.GetDescendantBounds(target);

           Point mousePos= MouseUtilities.GetMousePosition(target);
           return bounds.Contains(mousePos);
       }
   }
}

..........................................................................
The code for MouseUtilities.cs is :

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Media;

namespace DragDropManager
{
    /// <summary>
    /// Provides access to the mouse location by calling unmanaged code.
    /// </summary>
    /// <remarks>
    /// This class was written by Dan Crevier (Microsoft).
    /// http://blogs.msdn.com/llobo/archive/2006/09/06/Scrolling-Scrollviewer-on-Mouse-Drag-at-the-boundaries.aspx
    /// </remarks>
    public class MouseUtilities
    {
        [StructLayout(LayoutKind.Sequential)]
        private struct Win32Point
        {
            public Int32 X;
            public Int32 Y;
        };

        [DllImport("user32.dll")]
        private static extern bool GetCursorPos(ref Win32Point pt);

        [DllImport("user32.dll")]
        private static extern bool ScreenToClient(IntPtr hwnd, ref Win32Point pt);

        /// <summary>
        /// Returns the mouse cursor location. This method is necessary during
        /// a drag-drop operation because the WPF mechanisms for retrieving the
        /// cursor coordinates are unreliable.
        /// </summary>
        /// <param name="relativeTo">The Visual to which the mouse coordinates will be relative.</param>
        public static Point GetMousePosition(Visual relativeTo)
        {
            Win32Point mouse = new Win32Point();
            GetCursorPos(ref mouse);

            // Using PointFromScreen instead of Dan Crevier's code (commented out below)
            // is a bug fix created by William J. Roberts. Read his comments about the fix
            // here: http://www.codeproject.com/useritems/ListViewDragDropManager.asp?msg=1911611#xx1911611xx
            return relativeTo.PointFromScreen(new Point((double)mouse.X, (double)mouse.Y));

            #region Commented Out
            //System.Windows.Interop.HwndSource presentationSource =
            //    (System.Windows.Interop.HwndSource)PresentationSource.FromVisual( relativeTo );
            //ScreenToClient( presentationSource.Handle, ref mouse );
            //GeneralTransform transform = relativeTo.TransformToAncestor( presentationSource.RootVisual );
            //Point offset = transform.Transform( new Point( 0, 0 ) );
            //return new Point( mouse.X - offset.X, mouse.Y - offset.Y );
            #endregion // Commented Out
        }
    }
}

-------------------------------------------------------------------------------------------------------------------------
I have tested the drag drop of nearly 10,000 items from one listview to another and it was excellent(milliseconds).
There are some things that i want to say:
1)If u want to this to work for all SelectionModes,U'll will to do some changes or better to checks before using selectedItems property.

2)The dragDrop between listviews will function when the two controls have same itemType(T) as the observableCollection type.
For any other type,U'll have do some little more coding .:P

3)The reason for ICloneable Interface is because if u drag and drop one item two or more times to another listview,And then select that item in the other listview,U'll get some annoying behaviour of selection.
To Overcome that,I have used IConeable Interface for the meanwhile..

If u have any questions regarding this code or feedback,u r most welcome.

And do let me know if u think to make it more graceful and well written code in near future,becoz I'll have time to work on this after 1-2 months only... hopefully....:)

How to Wrap hard disk in a control?Help

sonam — Fri, 28 Nov 2008 17:38:02 GMT

Well..I am trying to index my hard disk.
After making an initial Index,I want to get notified from hard disk for any change in the file system on any drive whatsoever (Removable media not into account).The hard disk will notify a background running windows service(of my app) for event like file moved,copied,deleted,created etc.
U can say,i want to make my hard disk a control like a button which fires event when clicked.Using Windows Indexing Service would be an overkill.
Any suggestions or ideas or alternates if somebody have in mind.:)
I would be very thankful to u.

algo for kth smallest no .

sonam — Mon, 24 Nov 2008 15:56:20 GMT

Well,I am trying hard to get an internship preferably from Microsoft and that too in US..
Now a days, i am trying to build an Impressive portfolio..But these end semester exams have really made my pace a little slow towards doing some creative things.
Anyways,I was reading up some Interview experiences of Interns at Microsoft..In that i got a question,:
Ques:"Finding the kth smallest element in a given unsorted sequence of nos."?
The intern answered that we can sort and then find that kth no.
Well this might be right but has flaw, when all the nos in the array are not distinct.
But the Interviewer emphasized on doing without sorting.

Well,I thought to give it   a shot.This question was already asked by my prof of DAA (Data Analysis And Algo)in Internal viva to someone but he was expecting a conventional answer of some steps of Randomised sort etc.
No one knew the steps ,neither they tried to think for some method.
I thought to give this question a shot and within few minutes i invented a nice algo.
A nice algo becoz it works for every sequence,a recursive procedure and it was invented by me in few minutes.Maybe ,someone had already knew this but atleast i didn't knew anything before(my ignorance)..

Here is the code :

class KthSmallestElement

    {
       static int highest; //Maximum Element Among all the numbers in the sequence
       static int smallest;    //Smallest number among all the numbers in sequence
       static int i = 1;        //Index which stores the Last position in sorted array

        /// <summary>
        /// The algo is :
        /// At each call to method,we find the smallest no which is not in the sorted array.
        /// Since,The sorted array is initialized with smallest number in the sequence,
        /// the method goes on finding next smaller numbers until the length of array reaches k.
        /// Finally,we have a sorted array which contains all the elements of sequence sorted upto kth position.
        /// but sorted array have all distinct numbers.
        /// </summary>
       /// <param name="sequence">unsorted "sequence" of numbers</param>
       /// <param name="sortArray">A temporary array "sortarray"</param>
       /// <param name="k">the kth position</param>
      static void KthElement(int[] sequence, int[] sortArray, int k)
        {
           int minimum=highest ;
            foreach (int number in sequence)
            {
                if (minimum > number && !sortArray.Contains(number))
                {
                    minimum = number;

                }
            }
            sortArray[i] = minimum;
            i++;
            if ((i) != k)
                KthElement(sequence, sortArray, k);               //Recursive call to find kth lement until sortarray contains k sorted elements

        }



        static void Main(string[] args)
        {

            int[] sequence = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,19,110 };
            int[] sortArray=new int[sequence.Length];
            highest = 110;
            smallest = 1;
            sortArray[0] = smallest;


            KthSmallestElement.KthElement(sequence, sortArray, 20);
            foreach(int no in sortArray)
            Console.WriteLine(no);
            Console.WriteLine("The 20th smallest No is : " + sortArray[i-1]);
        }


    }