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Articles indexed in December 2010

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• using jQuery .live with .bind

  - by Aninemity

  okay, I understand the basics of jQuery, and I know that in some instances I've had to use .live('click',function(){...}); instead of .click(function(){...}); to get the method to fire correctly. the method I'm currently looking at is: $('#title').bind('keyup', function(){...}); This works great, except because it's in a bit of code that isn't called until another action is preformed, I'd need to use .live() as described above. Problem is, I don't know how to format this one to work using the .live() method instead of .bind() as shown above. Can someone please help? Thanks in advance!

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• subdomain/virtualhost problem on unix + apache

  - by Aaron

  Hello, I'm having a strangely difficult time setting up a subdomain (x.example.com). The main site works fine, but I get 404 errors attempting to hit x.example.com no matter how I set up the VirtualHost config. NameVirtualHost *:80 <VirtualHost *:80> ServerName www.example.com DocumentRoot /var/www/example.com/htdocs ServerAlias example.com </VirtualHost> <VirtualHost *:80> ServerName x.example.com ErrorLog /var/logs/x-error-log CustomLog /var/logs/x-access-log common DocumentRoot /var/www/x/htdocs </VirtualHost> As far as I can tell, this is a vanilla set up. Any suggestions would be appreciated.

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• I need a relatively cheap host, which will be able to handle sudden peaks in traffic?

  - by Morten K

  Hello, We're launching a product in a few months, which will obviously have a website. Judging from our current traffic, we believe that overall traffic will probably not be that much, but we are aiming at promoting the site heavily using social media. This has the typical problem, that IF we get suddenly get picked up by a large tech blog, we will see a sudden burst: A very heavy increase in traffic all of the sudden. If we use a cheap charlie host as our current host is (www.unoeuro.com) or something similar like GoDaddy, I'm afraid that the site will go down under the load. If that happens, then we might as well have thrown our social media marketing dollars out of the window. Our site will be relatively lightweight, all videos hosted at Youtube or Vimeo and other than that mainly just a standard webpage (ie nothing too heavy). I am hoping for recommendations for a good hosting company, which has some form of scalable hosting, so if / when a traffic surge hits, the site will not go down.

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• How to fix choppy video with VLC player?

  - by Brian Ojeda

  When playing most movies in VLC player, the video feed is choppy. Furthermore, the sound is near perfect. Another catch is, this video issue wasn't always an issue. I use to play movies with no problem with video or sound. I can not pin point what has changed between the it use to work fine and the time it started being choppy though. I have an ASUS G73JW-A1. This system should be more than enough to handle the demand of playing HD videos. Movies that are normally effected are HD videos. These video range from 4 to 9 gigs. In addition, the videos are in MKV, MP4 (or M4V), and AVCHD (or M2TS) formats. I get the same results when playing move directly off my hard drive or off an external. Finally, all the drivers have been recently checked and updated if needed.

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• How to run wireshark on the background without the GUI?

  - by user60968

  Hello everybody, I am trying to run Wireshark on Mac OS X, on the background. I did install the command line utilities, and so I am able to start wireshark and capture packet using the command line. The only thing I want now is to run it on the background, without even having the X11 icon on the task bar and see the window of wireshark. I believe it is possible but can't find anything on the doc of Wireshark. Maybe another way would be to find a trick to hide an icon on Mac OS X... If anybody already did that or have an idea... Thank you Please excuse my English which is not perfect at all

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• How to calculate RAM value on performance per dollar spent

  - by Stucko

  Hi, I'm trying to make decisions on buying a new PC. I have most specifications (processor/graphic card/hard disk) pin-downed except for RAM. I am wondering what is the best RAM configuration for the amount of money I'm spending. As the question of best is subjective, I'd like to know how would I calculate the value of RAM sticks sold. 1.(sample)The value of amount of memory: 1) CORSAIR PC1333 D3 2GB = costs $80 2) CORSAIR PC1333 D3 4GB = costs $190 would it be better to buy 2 of item 1) instead of 1 of item 2) ?? Although I would normally choose to have 1 of 2) as the difference is only (190-(80*2)) = 30 as I would save 1 DIMM slot, What I need is the value per amount: 1) 80/ 2 = $40 per 1GB 2) 190/ 4 = $47.5 per 1GB 2. The value of frequency: 1) CORSAIR PC1333 4GB = costs 190 2) CORSAIR PC1600C7 4GB = costs 325 Im not even sure of the denominator ... $ per 1 ghz speed? 3. The value of latency: 1) CORSAIR CMP1600C8 8-8-8-24 2GBx3 (triple channel) = costs 589 2) CORSAIR CMP1600C7D 7-7-7-20 2GBx3 (triple channel) = costs 880 Im not even sure of the denominator ... $ per 1 ghz speed? Just for your information i'd like to get the best out of the money im going to spend to put on a 6 DIMM slot i7core motherboard.

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• What RSS Reader can handle item-updating (JIRA search) feeds?

  - by Stephen

  Thunderbird is a good rss reader in terms of being able to connect successfully to jira authenticated search feeds (where evolution-rss and Liferea can't), but really sucks when it comes to updating. A Jira search feed will give a link id to http://jira/browse/[ticket no], and if that ticket/feed-item is updated, thunderbird refuses to update it - it already has it! (even though the item date does not match). Also, if you delete the ticket update, it will never show up again for that news account. Has anybody found an RSS reader that can work with JIRA/updating RSS items? Note: this is not the same as Jira activity feeds - those work great, as each update has a unique item id To replicate: Grab a search (any search) Get it into your rss reader Read an item, modify the linked ticket Update rss and see if the ticket bumps to most recent and unread or, generically: Get an rss feed (from your hard drive?) Modify an item in the middle changing the content, the date, and moving it to the top Update rss and see if the ticket bumps to most recent and unread

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• SQLAuthority News – Community Service and Public Speaking Engagements

  - by pinaldave

  Today is the last day of the year and I was going over my memories for year 2010. Almost all of them are good and I feel for sure better person in terms of knowledge, nature and overall human being. Looking back at the year, it is very satisfying as I was able to go out in public and help community out at various capacity. Thought, most of the time my contribution was as speaker, many times, I have reached out and helped organized event and worked at any capacity to get the event out. I have taken parts in many TechEds, PASS events, Virtual Tech Days, Various Community Events around the Globe and my contribution is not limited to my country only. Overall – I feel good to be part of this wonderful and supportive community. SQLAuthority News – A Successful Community TechDays at Ahmedabad – December 11, 2010 SQLAuthority News – A Successful Performance Tuning Seminar at Pune – Dec 4-5, 2010 SQL SERVER – A Successful Performance Tuning Seminar – Hyderabad – Nov 27-28, 2010 – Next Pune SQLAuthority News – SQLPASS Nov 8-11, 2010-Seattle – An Alternative Look at Experience SQLAuthority News – Statistics and Best Practices – Virtual Tech Days – Nov 22, 2010 SQLAuthority News – SQL Server Performance Optimizations Seminar – Grand Success – Colombo, Sri Lanka – Oct 4 – 5, 2010 SQL SERVER – Visiting Alma Mater – Delivering Session on Database Performance and Career – Nirma Institute of Technology SQLAuthority News – Feedback Received for Virtual Tech Days Sessions on Spatial Database SQLAuthority News – Community Tech Days, Ahmedabad – July 24, 2010 SQLAuthority News – SQL Data Camp, Chennai, July 17, 2010 – A Huge Success SQLAuthority News – 2 Sessions at TechInsight 2010 – June 29 – July 1, 2010 SQLAuthority News – Author Visit – SQL Server 2008 R2 Launch SQLAuthority News – Professional Development and Community SQLAuthority News – TechEd India – April 12-14, 2010 Bangalore – An Unforgettable Experience – An Opportunity of A Lifetime SQLAuthority News – Speaking Sessions at TechEd India – 3 Sessions – 1 Panel Discussion SQLAuthority News – Meeting with Allen Bailochan Tuladhar – An Unlimited Experience SQLAuthority News – Author Visit Review – TechMela Nepal – March 29-30, 2010 SQLAuthority News – Excellent Event – TechEd Sri Lanka – Feb 8, 2010 SQLAuthority News – Hyderabad Techies February Fever Feb 11, 2010 – Indexing for Performance SQLAuthority News – MUGH – Microsoft User Group Hyderabad – Feb 2, 2010 Session Review SQLAuthority News – Ahmedabad Community Tech Days – Jan 30, 2010 – Huge Success For earlier year’s contribution you can check my webpage over here. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: About Me, Pinal Dave, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Book Review, SQLAuthority News, T SQL, Technology

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• Declarative programming vs. Imperative programming

  - by EpsilonVector

  I feel very comfortable with Imperative programming. I never have trouble expressing algorithmically what I want the computer to do once I figured out what is it that I want it to do. But when it comes to languages like SQL or Relational Algebra I often get stuck because my head is too used to Imperative programming. For example, suppose you have the relations band(bandName, bandCountry), venue(venueName, venueCountry), plays(bandName, venueName), and I want to write a query that says: all venueNames such that for every bandCountry there's a band from that country that plays in venue of that name. In my mind I immediately go "for each venueName iterate over all the bandCountries and for each bandCountry get the list of bands that come from it. If none of them play in venueName, go to next venueName. Else, at the end of the bandCountries iteration add venueName to the set of good venueNames". ...but you can't talk like that in SQL and I actually need to think about how to formulate this, with the intuitive Imperative solution constantly nagging in the back of my head. Did anybody else had this problem? How did you overcome this? Did you figured out a paradigm shift? Made a map from Imperative concepts to SQL concepts to translate Imperative solutions into Declarative ones? Read a good book? PS I'm not looking for a solution to the above query, I did solve it.

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• Emacs: methods for debugging python

  - by Tom Willis

  I use emacs for all my code edit needs. Typically, I will use M-x compile to run my test runner which I would say gets me about 70% of what I need to do to keep the code on track however lately I've been wondering how it might be possible to use M-x pdb on occasions where it would be nice to hit a breakpoint and inspect things. In my googling I've found some things that suggest that this is useful/possible. However I have not managed to get it working in a way that I fully understand. I don't know if it's the combination of buildout + appengine that might be making it more difficult but when I try to do something like M-x pdb Run pdb (like this): /Users/twillis/projects/hydrant/bin/python /Users/twillis/bin/pdb /Users/twillis/projects/hydrant/bin/devappserver /Users/twillis/projects/hydrant/parts/hydrant-app/ Where .../bin/python is the interpreter buildout makes with the path set for all the eggs. ~/bin/pdb is a simple script to call into pdb.main using the current python interpreter HellooKitty:hydrant twillis$ cat ~/bin/pdb #! /usr/bin/env python if __name__ == "__main__": import sys sys.version_info import pdb pdb.main() HellooKitty:hydrant twillis$ .../bin/devappserver is the dev_appserver script that the buildout recipe makes for gae project and .../parts/hydrant-app is the path to the app.yaml I am first presented with a prompt Current directory is /Users/twillis/bin/ C-c C-f Nothing happens but HellooKitty:hydrant twillis$ ps aux | grep pdb twillis 469 100.0 1.6 168488 67188 s002 Rs+ 1:03PM 0:52.19 /usr/local/bin/python2.5 /Users/twillis/projects/hydrant/bin/python /Users/twillis/bin/pdb /Users/twillis/projects/hydrant/bin/devappserver /Users/twillis/projects/hydrant/parts/hydrant-app/ twillis 477 0.0 0.0 2435120 420 s000 R+ 1:05PM 0:00.00 grep pdb HellooKitty:hydrant twillis$ something is happening C-x [space] will report that a breakpoint has been set. But I can't manage to get get things going. It feels like I am missing something obvious here. Am I? So, is interactive debugging in emacs worthwhile? is interactive debugging a google appengine app possible? Any suggestions on how I might get this working?

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• Alternative to pyGame ?

  - by stighy

  Hi, i'm learning something about game programming from a book about "pyGame". pyGame is simple, but... python is a little complex and different from my previous knoweledge about programming. I know "classical" language: C# (also C/C++), Java ... I know a lot of people love Python but for me is a little harder to learn! So i'm looking something like "pyGame" but for java or for c# ... A library with which i can do almost the same thing i can do with pygame (so .. do more with less code ... and headhace). Thank you Ps: excuse my "poor" english!

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• How to get readable classname and title from HWND handle? in WinApi c++

  - by Marko29

  I am using the following enumchild proc to get hwnd of each window, the problem is that i am unable to somehow detect any info from each hwnd so i can do what i want with the ones that are detected as the ones i need. For example, how could i get window class name and the title of each window in the enum bellow? I tried something like.. BOOL CALLBACK EnumChildProc(HWND hwnd, LPARAM lParam) { TCHAR className[MAX_PATH]; GetClassName(hwnd, cName, _countof(cName)); cout << cName; return TRUE; } It just returns the hexadec handle info and every single time it is same, shouldnt the GetClassName func change the cName into new handle each time? Also GetClassName function returns number of chars written to cName, i dont really see how this is useful to me? I need to get my cName in some readable format so i can do something like if(cName == TEXT("classnameiamlookingfor" && hwndtitle = TEXT("thetitlethatinterestsme") DOSOMETHINGWITHIT(); But all i get here is hexadec mess.

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• Checkbox gets reset in WPF Datagrid when sorting

  - by user464420

  I have a WPF application with DataGrid The DataGrid contains 4 columns with a checkbox template column on the first column the problem is when i check some of the checkbox on the items, the checkbox would got reset when i sort a certain column. For example i check the checkbox on the row 2 it gets unchecked when i sort the datagrid. been searching for similar case like this for a while but haven't seen one Thanks,

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• CSS div rounded corners

  - by Ulkmun

  I'm attempting to do the following... Here's what I've got right now.. but it's not rendering correctly. Does anyone have any idea as to how I'd fix this? CSS /* Curved Corners */ .bl { background: url(bl.gif) 0 100% no-repeat; /*background-color:#EFFBEF;*/ width: 700px; margin-left: auto ; margin-right: auto ;} .br { background: url(br.gif) 100% 100% no-repeat; } .tl { background: url(tl.gif) 0 0 no-repeat; } .tr { background: url(tr.gif) 100% 0 no-repeat; } .clear {font-size: 1px; height: 1px} HTML <div class="bl"><div class="br"><div class="tl"><div class="tr"> <div id="header"> </div> <div id="footer"> </div> </div></div></div></div>

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• pthread_create followed by pthread_detach still results in possibly lost error in Valgrind.

  - by alesplin

  I'm having a problem with Valgrind telling me I have some memory possible lost: ==23205== 544 bytes in 2 blocks are possibly lost in loss record 156 of 265 ==23205== at 0x6022879: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==23205== by 0x540E209: allocate_dtv (in /lib/ld-2.12.1.so) ==23205== by 0x540E91D: _dl_allocate_tls (in /lib/ld-2.12.1.so) ==23205== by 0x623068D: pthread_create@@GLIBC_2.2.5 (in /lib/libpthread-2.12.1.so) ==23205== by 0x758D66: MTPCreateThreadPool (MTP.c:290) ==23205== by 0x405787: main (MServer.c:317) The code that creates these threads (MTPCreateThreadPool) basically gets an index into a block of waiting pthread_t slots, and creates a thread with that. TI becomes a pointer to a struct that has a thread index and a pthread_t. (simplified/sanitized): for (tindex = 0; tindex < NumThreads; tindex++) { int rc; TI = &TP->ThreadInfo[tindex]; TI->ThreadID = tindex; rc = pthread_create(&TI->ThreadHandle,NULL,MTPHandleRequestsLoop,TI); /* check for non-success that I've omitted */ pthread_detach(&TI->ThreadHandle); } Then we have a function MTPDestroyThreadPool that loops through all the threads we created and cancels them (since the MTPHandleRequestsLoop doesn't exit). for (tindex = 0; tindex < NumThreads; tindex++) { pthread_cancel(TP->ThreadInfo[tindex].ThreadHandle); } I've read elsewhere (including other questions here on SO) that detaching a thread explicitly would prevent this possibly lost error, but it clearly isn't. Any thoughts?

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• Error in PHP with Mysql

  - by maltad

  Hello, Im starting to learn PHP. When I run the script it had an error that said: "Assigned Employee:resource(6) of type (mysql result)" . Please help me and sorry for my bad English Here is the code: include_once 'rnheader.php'; include_once 'rnfunctions.php'; echo ''; echo ' Assigned Employee:'; $query = "SELECT UserName FROM employee where Classification_ClassificationID = '2'"; $result = queryMysql($query); if (!queryMysql($query)) { echo "Query fail: $query" . mysql_error() . ""; } else { var_dump($result); exit; echo ''; // or name="toinsert[]" while ($row = mysqli_fetch_array($result)) { echo '' . htmlspecialchars($row['UserName']) . ''; } } echo ''; ?

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• how do I get the IP of incoming ICMP due to UDP-send to dead client in Ruby?

  - by banister

  so.. I'm doing a small multiplayer game with blocking UDP and IO.select. To my problem.. (In the server) reading from a UDP socket (packet, sender = @socket.recvfrom(1000)) which have just sent a packet to a dead client results in a ICMP unreachable (and exception Errno::ECONNRESET in ruby). The problem is that I can't find any way whatsoever to extract the IP of that ICMP.. so I can clean out that dead client. Anyone know how to achieve this? thanks

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• Understanding an interesting array update/replace function

  - by dave

  I'm a PHP amateur. This array function is an adaption of a function I noticed while reading this article. I thought this was an interesting type of array function, but I have a question about the way it works. my_func( array( 'sky' => 'blue' ) ); function my_func( array $settings = array() ) { $settings = $settings + array( 'grass'=>'green','sky'=>'dark' ); print_r( $settings ) ; // outputs: Array ( [sky] => blue [grass] => green ) } but..................... my_func( array( 'sky' => 'blue' ) ); function my_func( array $settings = array() ) { $settings = array( 'clock'=>'time' ) ; $settings = $settings + array( 'grass'=>'green','sky'=>'dark' ); print_r( $settings ) ; // outputs: Array ( [clock] => time [grass] => green [sky] => dark ) } Why does [sky] not equal 'blue' in the second instance? Thanks.

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• javascript---click copy the content to the clipboard

  - by runeveryday

  the following is the code. but it doesn't work. what's wrong with it? thank you. <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>no title</title> <script type="text/javascript"> function copyToClipBoard(content){ var clipBoardContent = ''; clipBoardContent = content; window.clipboardData.setData("Text",clipBoardContent); alert('have copied to the clipboard'); } <body> <textarea rows="4" cols="60" id="url">www.example.com</textarea> <input type="button" value="click me" onclick="copyToClibBoard (document.getElementById ('url').value);" /> </body>

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• How do I create a graph from this datastructure?

  - by Shawn Mclean

  I took this data structure from this A* tutorial: public interface IHasNeighbours<N> { IEnumerable<N> Neighbours { get; } } public class Path<TNode> : IEnumerable<TNode> { public TNode LastStep { get; private set; } public Path<TNode> PreviousSteps { get; private set; } public double TotalCost { get; private set; } private Path(TNode lastStep, Path<TNode> previousSteps, double totalCost) { LastStep = lastStep; PreviousSteps = previousSteps; TotalCost = totalCost; } public Path(TNode start) : this(start, null, 0) { } public Path<TNode> AddStep(TNode step, double stepCost) { return new Path<TNode>(step, this, TotalCost + stepCost); } public IEnumerator<TNode> GetEnumerator() { for (Path<TNode> p = this; p != null; p = p.PreviousSteps) yield return p.LastStep; } IEnumerator IEnumerable.GetEnumerator() { return this.GetEnumerator(); } } I have no idea how to create a simple graph with. How do I add something like the following undirected graph using C#: Basically I'd like to know how to connect nodes. I have my own datastructures that I can already determine the neighbors and the distance. I'd now like to convert that into this posted datastructure so I can run it through the AStar algorithm. I was seeking something more like: Path<EdgeNode> startGraphNode = new Path<EdgeNode>(tempStartNode); startGraphNode.AddNeighbor(someOtherNode, distance);

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• PHP DOMDocument Error Handling Problem

  - by Jon

  I'm having trouble trying to write an if statement for DOM that will check if $html is blank. However whenever the html page does end up blank, it just removes everything that would be below DOM (including what I had to check if it was blank). $html = file_get_contents("http://example.com/"); $dom = new DOMDocument; @$dom->loadHTML($html); $links = $dom->getElementById('dividhere')->getElementsByTagName('img'); foreach ($links as $link) { echo $link->getAttribute('src'); } All this does is grab an image url in the specified div, which works perfectly until the page is a blank html page. I've tried using SimpleHTMLDOM, which didn't work either (it didn't even fetch the image on working pages). Did I happen to miss something with this one or am I just missing something in both? include_once('simple_html_dom.php') $html = file_get_html("http://example.com/"); foreach($html->find('div[id="dividhere"]') as $div) { if(empty($div->src)) { continue; } echo $div->src; }

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• Is tertiary operator possible here?

  - by silow

  I'm trying to set $value1, $value2, $value3 entirely using tertiary operators. This is what it looks like without tertiary if ($chk1 == 20) { $value1 = true; if ($chk2 == 40) { $value2 = 100 ; $value3 = 300; } else { $value2 = 200 ; $value3 = 400; } } else { $value1 = false; } I can set $value2 and $value3, but not sure how to set $value1. Can it be done? if ($chk1 == 20) { $value1 = true; $value2 = ($chk2 == 40) ? 100 : 200; $value3 = ($chk2 == 40) ? 300 : 400; } else { $value1 = false; }

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• How does this ruby custom accessor work

  - by ennuikiller

  So the method below in class_eval dynamically creates accessors for attributes defined at runtime. It can be used, for example, to create configuration objects with attributes read from a config file (and unknown until runtime). I understanding all of it except for the else branch. If I am correct the else branch returns the attribute value (val[0]) if there is one value passed in *val. However the way its written I would expect it to return an array (val) if there is more then one value passed in *var. In particular, if I have something like the following: value = 5 then from reading the code I would expect "#{@value}" to be [=,5]. However "#{@value}" returns 5 and not the array [=,5]. How is this possible? class Module def dsl_accessor(*symbols) symbols.each do |sym| class_eval %{ def #{sym}(*val) if val.empty? @#{sym} else @#{sym} = val.size == 1 ? val[0] : val end end } end end end

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• How can I write javascript that will load and print a web page to an image file and put that file in a specified location

  - by Rben

  Here's what I want to do: Load a web page from a specific location Print that web page into a jpeg, png, or other graphic file format Upload that image to another site, or save it to a location on my local network I know about window.print(), but that always seems to open up a print window, and I'd like to do as much of this operation silently as possible. Essentially, I want to be able to take a snap shot of the web page so it can be put in a directory that is accessed by one of those electronic picture frames. They can either access a web-based service, or a directory on the local network. Thanks in advance for your help, Rben

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• How necessary is using PHP filters?

  - by Jamie

  I'm a relatively newbie to PHP and just making my way through the W3Schools tut. The tut makes a big point of saying you must always filter external data (i.e. cookies, form data etc). I'm writing a fairly simple system that talks with a third party Joomla extension. It's at a prototype stage where I'm just wanting to demonstrate the functionality in a minimum viable product. Basically, I'd like to know... what's the worst that could happen in I don't filter content. Are we talking 'I might get a bunch of spam', or 'a good hacker could get root server access'? Have hunted around online, but would love any of your experience / insight on the matter!

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