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• How to Serialize Binary Tree

  - by Veljko Skarich

  I went to an interview today where I was asked to serialize a binary tree. I implemented an array-based approach where the children of node i (numbering in level-order traversal) were at the 2*i index for the left child and 2*i + 1 for the right child. The interviewer seemed more or less pleased, but I'm wondering what serialize means exactly? Does it specifically pertain to flattening the tree for writing to disk, or would serializing a tree also include just turning the tree into a linked list, say. Also, how would we go about flattening the tree into a (doubly) linked list, and then reconstructing it? Can you recreate the exact structure of the tree from the linked list? Thank you/

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• My Application running very slow..

  - by Atul Yadav

  Hi All.. I develop a application based on Advance data grid. In this grid every column add with help of item render and I have added check box in all the column header also.In the Grid i used xml data provider. I am creating xml as string and cast this string in to xml. When i click any cell it takes 10-13 sec and in the cell click handler i get value of System.totalMemory is 255205376. Please any one suggest me what i will do. Thanks

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• Packet Crafting on a Mac

  - by JayCrossler

  I think (based on searching the forums), that NetCat is the best option, but wanted to hear if others are preferable. Anyone have good success with a packet-crafting tool (specifically on Mac)? I've tried HPing, but had some issues. I'm looking into NetCat ('nc' on mac) now, but it's not working as I had thought. Basically, I captured some packets that a remote control sends over a wifi network to turn lights on and off (using X10 controllers), and am looking for a way to replay them by crafting a TCP packet from the command line. I used Wireshark to sniff the traffic, so I know the package is: DEVICE -sendplc-"C4 DIM 10" I'm trying: echo 'DEVICE -sendplc-"C4 DIM 10"' nc 192.168.2.196 6003 but there's no response from the receiving system. The exact bytestream is (if anyone wants to check that I got the right dataframe): 08004642f1b400260897ad6308004500004b08e240004006aaf5c0a802c1c0a802c4d8d7177399aab39 e57ff4753801880ae37ea00000101080a323353ce01b406424445564943457e73656e64706c637e2243 34204f4e220a Next step I'm going to check is to make sure the packet arrives exactly by sniffing and compare it to the original. [EDIT: Also at ServerFault now: Packet Crafting on a Mac, so this one becomes a duplicate across the two sites]

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• Jquery Accordion Close then Open

  - by Jon

  Hi Everyone, I've set up a number of accordions on a page using the jquery accordion plugin so I can implement expand all and collapse all functionality. Each ID element is it's own accordion and the code below works to close them all no matter which ones are already open: $("#contact, #address, #email, #sales, #equipment, #notes, #marketingdata") .accordion("activate", -1) ; My problem is with the expand all. When I have them all expand with this code: $("#contact, #address, #email, #sales, #equipment, #notes, #marketingdata") .accordion("activate", 0) ; Some will contract and some will expand based on whether or not they are previously open. My idea to correct this was to collapse them all and then expand them all when the expand all was clicked. This code however won't execute properly: $("#contact, #address, #email, #sales, #equipment, #notes, #marketingdata") .accordion("activate", -1) ; $("#contact, #address, #email, #sales, #equipment, #notes, #marketingdata") .accordion("activate", 0) ; It will only hit the second command and not close them all first. Any suggestions?

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• Changing Base Path In PHP

  - by Joshua

  I need to change the folder that "relative include paths" are based on. I might currently be "in" this folder: C:\ABC\XYZ\123\ZZZ And in this case, the path "../../Source/SomeCode.php" would actually be in this folder: C:\ABC\XYZ\Source And realpath('.') would = 'C:\ABC\XYZ\123\ZZZ'; If however, realpath('.') were "C:\Some\Other\Folder" Then in this case, the path "../../Source/SomeCode.php" would actually be in this folder: C:\Some\Source How do I change what folder is represented by '.' in realpath()? Like this: echo ('BEFORE = '.realpath('.')); // BEFORE = C:\ABC\XYZ\123\ZZZ // Some PHP code here... echo ('AFTER = '.realpath('.')); // AFTER = C:\Some\Other\Folder How can I change the folder represented by '.', as seen by realpath()?

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• Do I need to use C3P0 pooling library in my (grails) web application?

  - by fabien7474

  Hi, I am not familiar at all with connection pooling library. I've just discovered it through this blog article) and I am not sure that I should use one in my web application based on grails/hibernate/mysql. So my question is simple : in which situations would you suggest to integrate a connection pooling library into a grails application? Always, Never or only over some connections threshold? P.S. : If you have ever used successfully C3P0 in your web application, I will greatly appreciate to hear your feedback (in terms of visible positive effects).

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• Jquery UI accordion question - how would you approach this?

  - by E.J. Brennan

  I am using jquery UI accordion control in one of my apps asp.net apps. The data for the accordion comes from a database, and each database record has an ID, a Title Field and a content field. The title is the heading, and the content is the data that shows up when the draw is opened... I'd like to be able to call my page like this: http://www.mywebsite.com/mypage.aspx?ID=123 and have it display all the data (as it does now), but then have the default 'drawer' of the accordion open to the section that corresponds to the ID number passed in on the url...there are about 50 sections on the page. Any suggestions on how to approach this? My questions is specific to the jquery accordion function, the rest I know. So where would be the best place to 'tag' the drawer with the unique ID's, and then what is the snippet of javascript code (I assume) that I would use 'open' that drawer based on the ID passed in?? Thanks!

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• How to change *.ico for button in running mode?

  - by karikari

  I am currently doing visual c++ for an Internet Explorer toolbar button. I have a registration script file (*.rgs) that defines or maybe register the features of my button inside the Windows registry. My objective is, I want my button to change its *.ico image, based on certain conditions process from my *.cpp file. My problem is, I don't understand, how can I somehow change the *.ico file for my button in real time, during my application is running? For example, IF f = 1, ico_file = green.ico; ELSE ico_file = red.ico; Any idea, that you guys can point to me, how can I change the *.ico file for my Internet Explorer toolbar button while the IE is running.

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• Set environment variables using SSH

  - by Kunal

  Hello, I am trying to execute unix command using SSH from cygwin. My set of command would navigate to a certain directory, source a particular file. Based on the variables sourced from that file, I would try to launch application. But somehow the variables are not getting sourced as echo does not return any values. Could someone let me know what am I missing here Contents of the environment variables file (myenv) are export TEST_DATA="DATA1:DATA2" and I am executing the following command $ ssh kunal@kspace "ls; cd /disk1/kunal/env; . ./myenv; echo $TEST_DATA; "

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• Easiest way to find the correct kademlia bucket

  - by Martin

  In the Kademlia protocol node IDs are 160 bit numbers. Nodes are stored in buckets, bucket 0 stores all the nodes which have the same ID as this node except for the very last bit, bucket 1 stores all the nodes which have the same ID as this node except for the last 2 bits, and so on for all 160 buckets. What's the fastest way to find which bucket I should put a new node into? I have my buckets simply stored in an array, and need a method like so: Bucket[] buckets; //array with 160 items public Bucket GetBucket(Int160 myId, Int160 otherId) { //some stuff goes here } The obvious approach is to work down from the most significant bit, comparing bit by bit until I find a difference, I'm hoping there is a better approach based around clever bit twiddling. Practical note: My Int160 is stored in a byte array with 20 items, solutions which work well with that kind of structure will be preferred.

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• Returning a complex data type from arguments with Rhino Mocks

  - by Joseph

  I'm trying to set up a stub with Rhino Mocks which returns a value based on what the parameter of the argument that is passed in. Example: //Arrange var car = new Car(); var provider= MockRepository.GenerateStub<IDataProvider>(); provider.Stub( x => x.GetWheelsWithSize(Arg<int>.Is.Anything)) .Return(new List<IWheel> { new Wheel { Size = ?, Make = Make.Michelin }, new Wheel { Size = ?, Make = Make.Firestone } }); car.Provider = provider; //Act car.ReplaceTires(); //Assert that the right tire size was used when replacing the tires The problem is that I want Size to be whatever was passed into the method, because I'm actually asserting later that the wheels are the right size. This is not to prove that the data provider works obviously since I stubbed it, but rather to prove that the correct size was passed in. How can I do this?

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• Python subprocess: callback when cmd exits

  - by Anon

  Hi, I'm currently launching a programme using subprocess.Popen(cmd, shell=TRUE) I'm fairly new to Python, but it 'feels' like there ought to be some api that lets me do something similar to: subprocess.Popen(cmd, shell=TRUE, postexec_fn=function_to_call_on_exit) I am doing this so that function_to_call_on_exit can do something based on knowing that the cmd has exited (for example keeping count of the number of external processes currently running) I assume that I could fairly trivially wrap subprocess in a class that combined threading with the Popen.wait() method, but as I've not done threading in Python yet and it seems like this might be common enough for an API to exist, I thought I'd try and find one first. Thanks in advance :)

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• Powershell script to delete old files

  - by yantwill

  The following script will delete files in a named directory that are older than 14 days and write to a .txt with the path and the files deleted (found this script on another forum..credit to shay): dir c:\tmp -recurse | where {!$.PsIsContainer -AND $.lastWriteTime -lt (Get-Date).AddDays(-14) } | select LastWriteTime,@{n="Path";e={convert-path $_.PSPath}} | tee c:\oldFiles.txt | Remove-Item -force -whatif I have 3 questions: What is -lt and what is -le and what is -gt? When would I use each one The script above only deletes file...how can I delete folders as well? The script above is based off of LastWriteTime .. what about CreatedDate or LastAccessed time?

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• Hierarchical animations in DirectX and handling seperate animations on the same mesh?

  - by meds

  I have a hierarchical animated model in DirectX which loads and animates based on the following DirectX sample: http://msdn.microsoft.com/en-us/library/ee418677%28VS.85%29.aspx As good as the sample is it does not really go into some of the details of animation that I'd like. For example, if I have a mesh which has a running animation and a throwing animation as seperate animation sets how can I get the throwing animation to occur for bones above the hip and the walking animation to occur for bones underneath the hip? Also if I wanted to for example have the person lean left or right would I simply have to find the bone for the hip and multiplay a rotation matrix by its matrix? In this case I think the matrix is m_amxBoneOffsets?

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• Converting a JSP to a SharePoint webpart

  - by Kelly French

  We have a large number of Java based servlets/portlets running in a BEA portal that we want to convert into SharePoint 2007 webparts. Many of the portlets use user preferences but the implementations are split between preferences being handled by the portlet directly and stored in a separate database from the portal. Others are using the BEA WebLogic API for user preferences. Three questions: Has anyone gotten a Java Servlet/JSP (compiled against JRE 1.4.2 and running on Tomcat 4.1) to run as a SharePoint 2007 webpart? How large of an effort was it in general (as in, was it measured in days/weeks/months)? Would it be easier to rewrite the portlet as native webparts at least as far as user preferences are concerned?

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• SharePoint People editor control - UpdatePanel postback issue

  - by rjn

  Hi I've a people editor control inside an update panel. During postback, I need to update the value of people editor control based on some selection. Though the value is getting updated, it is not being persisted on postback. I can see the value being updated when I debug. All other controls inside the update panel are working fine and their values are updated on postback. I have read blogs that we need to set the style attribute "display:block" on postback, but that's not working for me. Any suggestions highly appreciated. Thanks

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• taskbar-free window manager

  - by 7vies

  I'm looking for a window manager that is not based on the "standard" taskbar (which I find a poor idea and I'm completely tired of). I'm aware of tiling window managers and improvements in last versions of operating systems, but I can't find what I need. I suppose that any window takes the whole screen (or can be tiled), and I imagine switching between windows like that: on a hotkey or mouse hot zone the screen becomes a task switcher where tasks are organized in a somewhat convenient manner. Well, it's a bit like a taskbar with autohide, but I think there could be some more convenient ideas than simply stacking icons and descriptions... It is also supposed to be lightweight enough, for example to run on a netbook. Any suggestions?

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• .NET Data Providers - How do I determine what they can do?

  - by rbellamy

  I have code which could be executed using a Provider that doesn't support transactions, or doesn't support nested transactions. How would I programmatically determine such support? E.g. The code below throws a System.InvalidOperationException on the final commit when using the MySQL .NET Connector, but works fine for MSSQL. I'd like to be able to alter the code to accommodate various providers, without having to hardcode tests based on the type of provider (E.g. I don't want to have to do if(typeof(connection) == "some provider name")) using (IDbConnection connection = Use.Connection(ConnectionStringName)) using (IDbTransaction transaction = connection.BeginTransaction()) { using (currentCommand = connection.CreateCommand()) { using (IDbCommand cmd = connection.CreateCommand()) { currentCommand = cmd; currentCommand.Transaction = transaction; currentCommand.ExecuteNonQuery(); } if (PipelineExecuter.HasErrors) { transaction.Rollback(); } else { transaction.Commit(); } } transaction.Commit(); }

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• In OpenRasta is it possible to Pattern match multiple key/value pairs?

  - by Scott Littlewood

  Is it possible in OpenRasta to have a Uri pattern that allows for an array of values of the same key to be submitted and mapped to a handler method accepting an array of the query parameters. Example: Return all the contacts named Dave Smith from a collection. HTTP GET /contacts?filterBy=first&filterValue=Dave&filterBy=last&filterValue=Smith With a configuration of: What syntax would be best for the Uri string pattern matching? (Suggestions welcome) ResourceSpace.Has.ResourcesOfType<List<ContactResource>>() .AtUri("/contacts") .And.AtUri("/contacts?filterBy[]={filterBy}[]&filterValue[]={fv}[]") // Option 1 .And.AtUri("/contacts?filterBy={filterBy}[]&fv={fv}[]") // Option 2 Would map to a Handler method of: public object Get(params Filter[] filters) { /* create a Linq Expression based on the filters using dynamic linq query the repository using the Linq */ return Query.All<Contact>().Where(c => c.First == "Dave" && c.Last == "Smith").ToResource() } where Filter is defined by public class Filter { public string FilterBy { get; set; } public string FilterValue { get; set; } }

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• How Do I Convert text to a WAV file With Inaudible Waveform?

  - by Scott

  I am trying to create an audio watermarking system. I figure the best solution is to create an audio file (WAV) based on a unique string of text and then combine this with the original wav. The part that makes this tricky (for me anyway) is: How do I convert the text string to a wav? How do I ensure that the resulting WAV form is inaudible (or at least barely noticeable to the listener). I would prefer this be done server side (via PHP, etc) but if the processing load isn't too much then would be ok with something in Flash or Javascript. I'd be willing to pay someone to create me a workable solution (complete source code that functions as described). Thanks, Scott!

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• How do I find hash value of a 3D vector ?

  - by brainydexter

  I am trying to perform broad-phase collision detection with a fixed-grid size approach. Thus, for each entity's position: (x,y,z) (each of type float), I need to find which cell does the entity lie in. I then intend to store all the cells in a hash-table and then iterate through to report (if any) collisions. So, here is what I am doing: Grid-cell's position: (int type) (Gx, Gy, Gz) = (x / M, y / M, z / M) where M is the size of the grid. Once, I have a cell, I'd like to add it to a hash-table with its key being a unique hash based on (Gx, Gy, Gz) and the value being the cell itself. Now, I cannot think of a good hash function and I need some help with that. Can someone please suggest me a good hash function? Thanks

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• same logged in user assigned different session ids (in different browsers)

  - by Lyon

  Hi, I've implemented a mysql-based session interface in php. I just found out that if I log in to my account using browser A (e.g. Chrome), and then I log in to the same account in another browser B (e.g. IE), each browser is assigned 2 separate session ids. How can I make it such that when I log in again using browser B, I retain the active session of the previous browser A? The issue at hand is that I'm storing certain information in the session and the data not being synchronised between the same users in different browsers and is wrecking havoc. :S Is there a way to achieve this? Thanks!

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• Can I use Catalyst to display images or graphs?

  - by Octopus

  I have simple Perl/CGI scripts based web server which is mainly used to display graphs and images. I am looking to make it more technical and come to know about Catalyst. I have installed all the required Perl modules on my test platform and created an application called myweb. Also, I am going through the Catalyst documents to reach my goal but nothing helpful yet. Is Catalyst helpful to display images/graphs on web? How can I use my existing CGI/Perl scritps with Catalyst? Any example would be really appreciated.

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• Oracle 10g - Best way to escape single quotes

  - by satynos

  I have to generate some update statements based off a table in our database. I created the following script which is generating the update statements I need. But when I try to run those scripts I am getting errors pertaining to unescaped single quotes in the content and &B, &T characters which have special meaning in oracle. I took care of the &B and &T problem by setting SET DEFINE OFF. Whats the best way to escape single quotes within the content? DECLARE CURSOR C1 IS SELECT * FROM EMPLOYEES; BEGIN FOR I IN C1 LOOP DBMS_OUTPUT.PUT_LINE('UPDATE EMPLOYEES SET FIRST_NAME= ''' || I.FIRST_NAME|| ''', LAST_NAME = ''' || I.LAST_NAME ''', DOB = ''' || I.DOB|| ''' WHERE EMPLOYEE_ID = ''' || I.EMPLOYEE_ID || ''';'); END LOOP; END; Here if the first_name or last_name contains single quotes then the generated update statements break. Whats the best way to escape those single quotes within the first_name and last_name?

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• What is a good Javascript RDFa parser implementation?

  - by tremoloqui

  I am looking to implement a client side RDFa based formatting for a web application. This would be similar to Mark Birbeck's ubiquity-rdfa project. Mark's project looks fantastic but it has at least two drawbacks: It is slow. Adding RDFa formatting to a simple page causes a noticeable delay in page loading. It is complex. The ubiquity-rdfa project makes use of the w3c fresnel specification which is complex way to add simple annotations to client markup. I am looking for a lighter weight way of adding annotations through client code and I don't mind doing some work to get it. What I would like is a fast and reliable Javascript RDFa parser. Some implementations that I have found include: W3C RDFa bookmarklet parser Elias Torres RDFa extractor I am interested to know if you would recommend one of these, or another, RDFa Javascript implementation. Thanks!

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