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  • What books help one to learn to read code?

    - by Daniel
    Lion's Commentary on Unix Sixth Edition with Source Code is a wonderful book to learn how to read code. Reading code is important -- how does one learn how to write excellent code without having read excellent code? But, sadly, while great writers, of fiction and non-fiction, all spend a great deal of time reading stuff, we, programmers, seem to avoid it like the plague. Worse still, programming books usually go the same way. They might show a pattern or a style, but they often avoid showing good, complex code, and helping one go through it. There are exceptions, of course. I hope. So, with that in mind, what books are to be found which help one learn how to read code?

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  • Can the lock function be used to implement thread-safe enumeration?

    - by Daniel
    I'm working on a thread-safe collection that uses Dictionary as a backing store. In C# you can do the following: private IEnumerable<KeyValuePair<K, V>> Enumerate() { if (_synchronize) { lock (_locker) { foreach (var entry in _dict) yield return entry; } } else { foreach (var entry in _dict) yield return entry; } } The only way I've found to do this in F# is using Monitor, e.g.: let enumerate() = if synchronize then seq { System.Threading.Monitor.Enter(locker) try for entry in dict -> entry finally System.Threading.Monitor.Exit(locker) } else seq { for entry in dict -> entry } Can this be done using the lock function? Or, is there a better way to do this in general? I don't think returning a copy of the collection for iteration will work because I need absolute synchronization.

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  • Android dev time vs iPhone dev time

    - by Daniel Benedykt
    Hi IF someone has to develop the same application for Android and iPhone, is it more difficult to develop in one platform than on the other? Does it take more time? Lets think about the average app. Lists, text , buttons, fetch information from the internet. Thanks

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  • Can I ReRender the entire tree of a component?

    - by Ben
    Hi, I have a JSF application with several major components and a component tree under each. On a certain event (Value change) I would like to reRender the entire component tree for one of those components. For example: can I rerender components 1,2 and 3 in one shot here: <h:panelgroup id="1"> <h:panelgroup id="2"> <h:panelgroup id="3"> <h:panelgroup/> <h:panelgroup/> <h:panelgroup/> <h:commandButton rerender="1*"> <--- Made up code. Is that possible? Another Idea - Can I reRender with wildcards? (I.E - ReRender all components who's ID's begin or contain: "UpdateMe") Thanks!

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  • Loop not working when I try to traverse a Simple XML Object

    - by Ben Shelock
    I'm trying to loop through the results from the Last.fm API but it's not working. function get_url($url){ $ch = curl_init(); curl_setopt($ch,CURLOPT_URL,$url); curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,5); $content = curl_exec($ch); curl_close($ch); return $content; } $xml = get_url('http://ws.audioscrobbler.com/2.0/?method=album.search&album=kid%20a&api_key=b25b959554ed76058ac220b7b2e0a026'); $doc = new SimpleXMLElement($xml); $albums = $doc->results->albummatches; foreach($albums as $album){ echo $album->album->name; } This just shows the first album. If I change the code within the foreach loop to echo $album->name; it shows nothing at all. What am I doing wrong?

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  • How would I find voluntary programming work?

    - by Ben
    While I look for a job, I'd like to do something useful with my time. I have a feeling there must be schools or charities or other worthy organisations that could use some of my time, but I've no idea how to go about finding them. Is there a marketplace for this kind of thing? I live in the UK.

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  • If Key Value pair exists in multidimensional array.. How to?

    - by Daniel White
    I have a codeigniter shopping cart going and its "cart" array is the following: Array ( [a87ff679a2f3e71d9181a67b7542122c] => Array ( [rowid] => a87ff679a2f3e71d9181a67b7542122c [id] => 4 [qty] => 1 [price] => 12.95 [name] => Maroon Choir Stole [image] => 2353463627maroon_3.jpg [custprod] => 0 [subtotal] => 12.95 ) [8f14e45fceea167a5a36dedd4bea2543] => Array ( [rowid] => 8f14e45fceea167a5a36dedd4bea2543 [id] => 7 [qty] => 1 [price] => 12.95 [name] => Shiny Red Choir Stole [image] => 2899638984red_vstole_1.jpg [custprod] => 0 [subtotal] => 12.95 ) [eccbc87e4b5ce2fe28308fd9f2a7baf3] => Array ( [rowid] => eccbc87e4b5ce2fe28308fd9f2a7baf3 [id] => 3 [qty] => 1 [price] => 14.95 [name] => Royal Blue Choir Stole [image] => 1270984005royal_vstole.jpg [custprod] => 1 [subtotal] => 14.95 ) ) My goal is to loop through this multidimensional array some how and if ANY product with the key value pair "custprod == 1" exists, then my checkout page will display one thing, and if no custom products are in the cart it displays another thing. Any help is appreciated. Thanks.

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  • Brief Explanation of C Supersets?

    - by Ben Hooper
    I'm getting more and more confused in regards to C's supersets the further I venture into the programming world. There's just so many versions.. C, C++, C#, Objective-C, Objective-C++ and God knows what else. I only know tidbits about these languages (some are object-oriented, some are procedural, C was originally developed for UNIX, C++ started as an extension and is used primarily on the Windows OS, Objective-C is primarily used on Linux and Mac OS/iOS, etc), but I'm not even sure that what I know is correct. I would just like someone to shed some light on what I "know" - a little bit more information about which are successive versions, which platforms each are generally used on, which are the best versions to learn, etc if anyone is feeling generous. :) Thanks. :)

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  • Using nsIZipWriter or other to compress a string as a string?

    - by Daniel
    I need to be able to take a javascript string, compress it using any fast and available means and get back a binary string/blob. Background: The extension I'm developing needs to send various large content to my server. It does this conveniently by dynamically creating a form, adding fields to the form and posting it. Some of these fields are just too big bandwidth wise for multiple use. I'd like to be able to compress them before adding them and then maybe base64'ing them if the characters cause a problem in the message. Any ideas? I could use nsiZipWriter with temporary files on disk but that is quite ugly and probably sluggish.

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  • How can I write a file on an sftp-server with PHP?

    - by Daniel
    Hi, I hope someone here could help me, because I couldn't find any solution with Google. What I have to do is to generate a XML-string (that works) an save that directly into a file on an sftp-server. So far, so good... I used the following code with ftp and it works to, but not with ftps. So I either need another options-configuration for the stream or a different way to solve that task. Here my current code: $host = 'ftp.example.com'; $port = 22; $user = 'xxxxxx'; $pass = 'xxxxxx'; $file = 'test_' . time() . '.txt'; $ftpPath = sprintf('ftp://%s:%s@%s:%d/%s', $user, $pass, $host, $port, $file); $context = stream_context_create(array('ftp' = array('overwrite' = true))); file_put_contents($ftpPath, 'test', 0, $context);

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  • javasrcipt asyncronous function

    - by Ben
    Hi there, i have a problem understanding how this could/should be solved. I have two functions. In the first function ( I call it loadData() ) I'm doing an asyncronous request to the server to load some data. In the second function ( saveData() ) I'm also doing an asyn request to the server to write some data. In the callback of this request I'm callin loadData() to refresh the data. Now the problem: In the saveData() function I want to wait for loadData() to be finished bevore I show a dialog (like alert('Data saved')) I guess this is a common problem, but I couldn't find the solution for it (if there is one..) A solution would be to make the requests syncronous, but the framework I'm using doesn't offer that and I hope there's a better solution.. Thanks to all!

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  • Examining a lambda expression at runtime in C#

    - by Ben Aston
    I have a method Get on a type MyType1 accepting a Func<MyType2, bool> as a parameter. An example of its use: mytype1Instance.Get(x => x.Guid == guid)); I would like create a stub implementation of the method Get that examines the incoming lambda expression and determines what the value of guid is. Clearly the lambda could be "anything", but I'm happy for the stub to make an assumption about the lambda, that it is trying to match on the Guid property. How can I do this? I suspect it involves the use of the built-in Expression type?

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  • What is necessary to run JavaScript files from MS Server 2003?

    - by Daniel
    I have created some JavaScript files and they run well from my Mac OS X Server. Now I have put the same JavaScript files on my MS Server 2003. But they don't work. Do I have to install something on the server in order to get them work? EDIT: (Sorry, I'm new and English is not my native language, so its hard for me to describe the situation well) I have downloaded this free Ajax Chat app. After enabling PHP on my Mac, it worked. But on my MS Windows 2003 Server it doesn't work. I installed PHP and Apache on Windows. PHP and Apache work well. But everything that uses JavaScript (such as drop down menus or pop-up windows) doesn't work. Thanks!

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  • activerecord search conditions - looking for null or false

    - by Daniel
    When doing a search in active record I'm looking for record's that do not have an archived bit set to true. Some of the archived bits are null (which are not archived) others have archived set to false. Obviously, Project.all(:conditions => {:archived => false}) misses the projects with the archived bits with null values. How can all non-archived projects be selected wtih active record?

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  • I have a serious problem to use 'happle' in xcode project.

    - by Daniel K
    Hello. I am a korean student, and I'm trying to develop a iphone application. I want to make the application which will shows contents of Web board, which is belong to some website. I will use 'UITableViewController", and the names of contents have to be displayed on table view. I heard that if I want to scrap the text on webpage, I have to use 'parser'. However, Iphone SDKs provide only the parser for xml webpage, NSXmlParser. In my acknowledges, NSXmlParser is not for HTML webpage, so it doesn't provide HTML parsing. If there is any way to parse HTML page with NSXmlParser, I want to know how to use that. Anyway, I found a simple and good HTML parser, 'happle', through searching on google. I tried to add the sources of happle on my xcode project, and I also add the libxml2.2.dylib, and I even set up 'Header search paths' and 'Other Linker Flags'. However It doesn't work. The Compiler show a error message : "No such file in dictionary". In my opinion, there is no frameworks file in my computer, so I tried to set up 'libxml2 frameworks' many times, but I coundn't success. please help me how to parse HTML page and how to set up libxml2... It really urgent. p.s. please forgive my ugly English

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  • Refresh Div with Jquery at fixed time

    - by Ben C
    I've got a php script that tells me when the next bus is due, and at the moment I'm refreshing this into a div, using jquery, every minute or so. Now, because I know the time at which the data will change (after the bus has come), I want it to refresh the div at this time (or just after, doesn't really matter). I should point out that I'm fairly new to js, but this is what I've got so far: var nextbustime = $('#bus').contents(); var nextbustime = new Date(nextbustime); var now = new Date(); var t = nextbustime.getTime() - now.getTime(); var refreshId = setTimeout(function() { $('#bus').fadeOut("slow").load('modules/bus.php?randval='+ Math.random()).fadeIn("slow"); }, t); The div is loaded originally with a php include. Naturally, what I've done doesn't work at all. Do I need some loops going on? Do I need to refresh the time calculator? Please please help! Thanks in advance...

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  • Xcode Unit Testing - Accessing Resources from the application's bundle?

    - by Ben Scheirman
    I'm running into an issue and I wanted to confirm that I'm doing things the correct way. I can test simple things with my SenTestingKit tests, and that works okay. I've set up a Unit Test Bundle and set it as a dependency on the main application target. It successfully runs all tests whenever I press cmd+B. Here's where I'm running into issues. I have some XML files that I need to load from the resources folder as part of the application. Being a good unit tester, I want to write unit tests around this to make sure that they are loading properly. So I have some code that looks like this: NSString *filePath = [[NSBundle mainBundle] pathForResource:@"foo" ofType:@"xml"]; This works when the application runs, but during a unit test, mainBundle points to the wrong bundle, so this line of code returns nil. So I changed it up to utilize a known class like this: NSString *filePath = [[NSBundle bundleForClass:[Config class]] pathForResource:@"foo" ofType:@"xml"]; This doesn't work either, because in order for the test to even compile code like this, it Config needs to be part of the Unit Test Target. If I add that, then the bundle for that class becomes the Unit Test bundle. (Ugh!) Am I approaching this the wrong way?

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  • Create an Edit view similar to Contacts App

    - by Daniel Granger
    I have an edit view in my app which is a instance of UITableViewController and contains one cell with a textfield in a grouped table. At the moment this cell is at the top of the screen and is firstResponder so they keyboard is visible as well. But in all the Apples apps like the Contacts App when you edit a piece of information like an Email it buts both of its rows in the middle between the Nav Bar and the Keyboard not at the top of the screen. How do I achieve this effect? Many Thanks

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  • Count number of empty input boxes in table row

    - by Daniel Brink
    How do you calculate the number of input boxes with no value in a table row using jquery? example: <table id="table1"> <tr class="data" id="row5"> <td><input type="text" value="20%" /></td> <td><input type="text" value="10%" /></td> <td><input type="text" value="" /></td> <td><input type="text" /></td> </tr> <table> I'm looking for answer = 2

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  • jQuery code not executing when DOM is ready

    - by Ben
    I have written a simple jQuery script that changes the hash tag of a link. I do this because I am using IntenseDebate comments in Wordpress but the comment link still links replaced id of the old comments. I'm using jQuery so that if javascript is enabled, the user can click on the comments link and it will take them to the IntenseDebate comments. If its not enabled it will take them to the traditional comments (because IntenseDebate requires javascript to function). The issue I'm having lies in this script to change the hash tag at the end of the link. Currently the URL "someurl.com/#respond" but I need the script to change it to "someurl.com/#comments". What is happening is that the script doesn't work, however I believe my syntax is correct so I decided to try copying and pasting the code into Firebug's console and the code executed perfectly. I could see that the link I was trying to change was now correct, and I could click on it and it worked as I desired. So what I don't understand is why the code is not executing when it is supposed to. I am using $(document).ready() and I have other jQuery on the page that executes just fine. I even tested it on a simple HTML page away from all the problems that might be caused by Wordpress and I received the same result. Does anyone know why this might be happening? Here is my code (I am using noConflict because Wordpress makes use of other frameworks): jQuery.noConflict(); jQuery(document).ready(function($) { $("a[href$='respond']").each(function() { this.href = this.href.replace("respond", "comments"); }); })(jQuery); Thanks very much for your help!

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