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  • Myself throwing NullReferenceException... needs help

    - by Amit Ranjan
    I know it might be a weird question and its Title too, but i need your help. I am a .net dev , working on platform for the last 1.5 years. I am bit confused on the term usually we say " A Good Programmer ". I dont know ,what are the qualities of a good programmer ? Is the guy who writes a bug free code? or Can develop applications solely? or blah blah blah...lots of points. I dont know... But as far i am concerned , I know I am not a good programmer, still in learning phase an needs a lot to learn in coming days. So you guys are requested to please help me with this two problems of mine My first problem is regarding the proper Error Handling, which is a most debatable aspect of programming. We all know we use ` try { } catch { } finally { } ` in our code to manage exception. But even if I use try { } catch(exception ex) { throw ex } finally { } , different guys have different views. I still dont know the good way to handle errors. I can write code, use try-catch but still i feel I lacks something. When I saw the codes generated by .net fx tools even they uses throw ex or `throw new Exception("this is my exception")`.. I am just wondering what will be the best way to achieve the above. All means the same thing but why we avoid something. If it has some demerits then it must be made obselete.Anyways I still dont have one [how to handle errors efficiently?]. I generally follow the try-catch(execoption ex){throw ex}, and usually got stucked in debates with leads why you follow this why not that... 2.Converting your entire code blocks in modules using Design patterns of some OOPs concepts. How do you guys decide what architeture or pattern will be the best for my upcoming application based on its working, flow etc. I need to know what you guys can see that I can't. Since I know , I dont have that much experience but I can say, with my experience that experience doesnot comes either from degree/certificates or success you made instead it cames from failures you faced or got stucking situations. Pleas help me out.

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  • How can I reduce jQuery?

    - by Tommy
    I'm using just a few basic jQuery functions on my site. How can I remove unused jQuery code? Knowing only the basics, I looked at the code and was not sure where to start. If you could point me in the right direction, that would be appreciated. Thanks.

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  • how to make Xcode indentation from beginning of previous line?

    - by Mikkel
    ok, possibly insanely n00b question or something i have overlooked in Xcode prefs: On pressing return, in stead of Xcode's syntax-aware indentation doing smart indent from whatever brackets i've used on the previous line, how can I make it so Xcode indents just from the beginning of the previous line? From the picture below, first block of code is what i got, second block of code is what I want. Visual representation:

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  • Loading jQuery plugin defaults from the server (AJAX)

    - by Pablo
    Im working on a private jQuery plugin in the following format: (function( $ ){ var defaults = {}; $.fn.cmFlex = function(opts) { this.each(function() { //Element specific options var o = $.extend({}, defaults, opts); //Code here }); //code Here }; })( jQuery ); How will i go on loading the default options from the server before $.cmFlex() is first called?

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  • Accessing a database through Obj-c

    - by Ricardo
    Hey, I am trying to find some source code on how to access and store variables from a database to my program via obj-c(iPhone). I have look for many hours now and no one has provided a sure fire way on how to go about this. If you have any advice or recommendations please post some source code or a link to it. Thanks for the help.

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  • decent html5 offline storage and caching examples

    - by Nils
    I'm keen to test out html offline storage and caching with a view to developing a prototype to show off the offline web application capabilities of html5. I've found some webkit-specific samples, but I'm battling to find any decent code samples that even work at all in Firefox 3.6 For a sample, I'd be happy with something that works with the following: Our company uses jquery extensively so I'd prefer samples that use that library or pure javascript. It should at least work on firefox (3.6+ is fine) Can anyone point me to some links that provide some guidance and code samples?

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  • Using Kal calendar without doing the initialization (and so on) in the AppDelegate

    - by testing
    I'm using the Kal calendar. For the code shown below I'm referring to the Holiday example. In this example the allocation and initialization of Kal is done in the applicationDidFinishLaunching in the AppDelegate. The UITableViewDelegate protocol (e.g. didSelectRowAtIndexPath) is also positioned in the AppDelegate class. The AppDelegate: #import "HolidayAppDelegate.h" #import "HolidaySqliteDataSource.h" #import "HolidaysDetailViewController.h" ## Heading ###import "Kal.h" @implementation HolidayAppDelegate @synthesize window; - (void)applicationDidFinishLaunching:(UIApplication *)application { kal = [[KalViewController alloc] init]; kal.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Today" style:UIBarButtonItemStyleBordered target:self action:@selector(showAndSelectToday)] autorelease]; kal.delegate = self; dataSource = [[HolidaySqliteDataSource alloc] init]; kal.dataSource = dataSource; // Setup the navigation stack and display it. navController = [[UINavigationController alloc] initWithRootViewController:kal]; [window addSubview:navController.view]; [window makeKeyAndVisible]; } // Action handler for the navigation bar's right bar button item. - (void)showAndSelectToday { [kal showAndSelectDate:[NSDate date]]; } #pragma mark UITableViewDelegate protocol conformance // Display a details screen for the selected holiday/row. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { Holiday *holiday = [dataSource holidayAtIndexPath:indexPath]; HolidaysDetailViewController *vc = [[[HolidaysDetailViewController alloc] initWithHoliday:holiday] autorelease]; [navController pushViewController:vc animated:YES]; } #pragma mark - - (void)dealloc { [kal release]; [dataSource release]; [window release]; [navController release]; [super dealloc]; } @end I don't want to put this into the AppDelegate, because there could be some overlapping code with other views. It should be a separate "component" which I can call and put on the stack. In my navigation based project I have a main view, the RootViewController. From there I want to push the Kal view on the stack. Currently I'm pushing an additional ViewController on the stack. In the viewWillAppear method from this ViewController I do the things shown in the code above. The following problems appear: Navigation back has to be done two times (one for the Kal calendar, one for my created view) Navigation to my main view is not possible anymore In the moment I don't know where to put this code. So the question is where to put the methods for allocation/initialization as well as the methods for the UITableViewDelegate protocol.

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  • Best pageable table implementation in GWT

    - by Steve Buikhuizen
    I need to add a paging, sortable table to my GWT application. I see lots of these out there so I'm looking for your experience to save me time by choosing the best one. So far I'm looking at... http://code.google.com/p/gwt-advanced-table/ http://code.google.com/p/google-web-toolkit-incubator/wiki/PagingScrollTableOld I like the second one best. Any stories to tell?

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  • Language to learn metaprogramming

    - by Erup
    What's the best language (in terms of simplicity, readability and code elegancy) in your opinion, to learn and work with metaprogramming? I think metaprogramming is the "future of coding". Not saying that code will extinct, but we can see this scenario coming on new technologies.

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  • Can these sorts of programs exist in every Turing-complete language?

    - by I can't tell you my name.
    In every Turing-Complete language, is it possible to create a working Compiler for itself which first runs on an interpreter written in some other language and then compiles it's own source code? (Bootstrapping) Standards-Compilant C++ compiler which outputs binaries for, e.g.: Windows? Regex Parser and Evaluater? World of Warcraft clone? (Assuming the language gets the necessary API bindings as, for example, OpenGL and the WoW source code is available) (Everything here theoretical) Let's take Brainf*ck as an example language.

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  • In VB 6 debug mode, problem with dll

    - by stan
    my vb6 app is not finding a dll that is residing in the same directory as the project. What do I do to have the vb6 code see the dll? When compiled to an exe, the code sees the dll if it is in the same dir as the exe. Thanks!

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  • Can someone explain/annotate this Ruby snippet with comments?

    - by Ronnie
    Could someone please add comments to this code? Or, alternatively, what would be the pseudocode equivalent of this Ruby code? It seems simple enough but I just don't know enough Ruby to convert this to PHP. data = Hash.new({}) mysql_results.each { |r| data[r['year']][r['week']] = r['count'] } (year_low..year_high).each do |year| (1..52).each do |week| puts "#{year} #{week} #{data[year][week]}" end end Any help whatsoever would be really appreciated. Thanks!

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  • Contact form problem - I do receive messages, but no contents (blank page).

    - by nitbuntu
    I have a contact form on site which used to work, but since last few months has stopped working properly. This could have been due to some coding error that I can't figure out. What happens is that I receive the messages sent, but they are completely blank, with no contents at all. What could be the problems? I'm attaching first the front-end page, and then the back-end. Sample of contact.php the front-end code:- <div id="content"> <h2 class="newitemsxl">Contact Us</h2> <div id="contactcontent"> <form method="post" action="contactus.php"> Name:<br /> <input type="text" name="Name" /><br /> Email:<br /> <input type="text" name="replyemail" /><br /> Your message:<br /> <textarea name="comments" cols="40" rows="4"></textarea><br /><br /> <?php require("ClassMathGuard.php"); MathGuard::insertQuestion(); ?><br /> <input type="submit" name="submit" value="Send" /> * Refresh browser for a different question. :-) </form> </div> </div> Sample of contactus.php (backend code):- <?php /* first we need to require our MathGuard class */ require ("ClassMathGuard.php"); /* this condition checks the user input. Don't change the condition, just the body within the curly braces */ if (MathGuard :: checkResult($_REQUEST['mathguard_answer'], $_REQUEST['mathguard_code'])) { $mailto="[email protected]"; $pcount=0; $gcount=0; $subject = "A Stylish Goods Enquiry"; $from="[email protected]"; echo ("Great, you're message has been sent !"); //insert your code that will be executed when user enters the correct answer } else { echo ("Sorry, wrong answer, please go back and try again !"); //insert your code which tells the user he is spamming your website } while (list($key,$val)=each($HTTP_POST_VARS)) { $pstr = $pstr."$key : $val \n "; ++$pcount; } while (list($key,$val)=each($HTTP_GET_VARS)) { $gstr = $gstr."$key : $val \n "; ++$gcount; } if ($pcount > $gcount) { $comments=$pstr; mail($mailto,$subject,$comments,"From:".$from); } else { $comments=$gstr; mail($mailto,$subject,$comments,"From:".$from); } ?>

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  • Methodology to understanding JQuery plugin & API's developed by third parties

    - by Taoist
    I have a question about third party created JQuery plug ins and API's and the methodology for understanding them. Recently I downloaded the JQuery Masonry/Infinite scroll plug in and I couldn't figure out how to configure it based on the instructions. So I downloaded a fully developed demo, then manually deleted everything that wouldn't break the functionality. The code that was left allowed me to understand the plug in much greater detail than the documentation. I'm now having a similar issue with a plug in called JQuery knob. http://anthonyterrien.com/knob/ If you look at the JQuery Knob readme file it says this is working code: <input type="text" value="75" class="dial"> $(function() { $('.dial') .trigger( 'configure', { "min":10, "max":40, "fgColor":"#FF0000", "skin":"tron", "cursor":true } ); }); But as far as I can tell it isn't at all. The read me also says the Plug in uses Canvas. I am wondering if I am suppose to wrap this code in a canvas context or if this functionality is already part of the plug in. I know this kind of "question" might not fit in here but I'm a bit confused on the assumptions around reading these kinds of documentation and thought I would post the query regardless. Curious to see if this is due to my "newbi" programming experience or if this is something seasoned coders also fight with. Thank you. Edit In response to Tyanna's reply. I modified the code and it still doesn't work. I posted it below. I made sure that I checked the Google Console to insure the basics were taken care of, such as not getting a read-error on the library. <!DOCTYPE html> <meta charset="UTF-8"> <title>knob</title> <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/hot-sneaks/jquery-ui.css" type="text/css" /> <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.js" charset="utf-8"></script> <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.21/jquery-ui.min.js"></script> <script src="js/jquery.knob.js"></script> <div id="button1">test </div> <script> $(function() { $("#button1").click(function () { $('.dial').trigger( 'configure', { "min":10, "max":40, "fgColor":"#FF0000", "skin":"tron", "cursor":true } ); }); }); </script>

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  • Migrating from hand-written persistence layer to ORM

    - by Sergey Mikhanov
    Hi community, We are currently evaluating options for migrating from hand-written persistence layer to ORM. We have a bunch of legacy persistent objects (~200), that implement simple interface like this: interface JDBC { public long getId(); public void setId(long id); public void retrieve(); public void setDataSource(DataSource ds); } When retrieve() is called, object populates itself by issuing handwritten SQL queries to the connection provided using the ID it received in the setter (this usually is the only parameter to the query). It manages its statements, result sets, etc itself. Some of the objects have special flavors of retrive() method, like retrieveByName(), in this case a different SQL is issued. Queries could be quite complex, we often join several tables to populate the sets representing relations to other objects, sometimes join queries are issued on-demand in the specific getter (lazy loading). So basically, we have implemented most of the ORM's functionality manually. The reason for that was performance. We have very strong requirements for speed, and back in 2005 (when this code was written) performance tests has shown that none of mainstream ORMs were that fast as hand-written SQL. The problems we are facing now that make us think of ORM are: Most of the paths in this code are well-tested and are stable. However, some rarely-used code is prone to result set and connection leaks that are very hard to detect We are currently squeezing some additional performance by adding caching to our persistence layer and it's a huge pain to maintain the cached objects manually in this setup Support of this code when DB schema changes is a big problem. I am looking for an advice on what could be the best alternative for us. As far as I know, ORMs has advanced in last 5 years, so it might be that now there's one that offers an acceptable performance. As I see this issue, we need to address those points: Find some way to reuse at least some of the written SQL to express mappings Have the possibility to issue native SQL queries without the necessity to manually decompose their results (i.e. avoid manual rs.getInt(42) as they are very sensitive to schema changes) Add a non-intrusive caching layer Keep the performance figures. Is there any ORM framework you could recommend with regards to that?

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  • How to create an object from 2 arrays?

    - by Ole Jak
    So I hava array Links and array Params with same langth N So what I need is to create an object where for each link from Links I will be able to see param from Params And than for example to be abble to call something like for each( item in object) if (item.param == "some value") { // some code } else... How to do such thing (Code exaMple, please)

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  • stock trade app help

    - by Rajesh Kumar Chandra
    Ok my last post disapper so I ask again. Ok if you cant send me code to stock trading app, i understand its dificult for to get code from forum can you point me to techonologies to use for making stock app. i got job from online brocker copany, they need to display both bombay exchange and others java, or c . or asp maybe thanks

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  • ruby parseexecel gem - array not implemented

    - by josh
    I am trying to work with two worksheets at the same time. So I have code require 'parseexcel' #Open the excel file passed in from the commandline workbook = Spreadsheet::ParseExcel.parse(ARGV[0]) workbook2 = Spreadsheet::ParseExcel.parse(ARGV[1]) #Get the first worksheet worksheet = workbook.worksheet(0) worksheet2 = workbook2.worksheet(0) However, when I run this code I get an error: array is not implemented This error goes away when I comment out line: workbook2 = Spreadsheet::ParseExcel.parse(ARGV[1]) Why is this happeneing? Way I am running script is: ruby -rubygems traverse.rb excel.xls so.xls

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  • using jQTouch for large website

    - by totato
    I want to use jQTouch to build iPhone app for large website. When searched for it, I understood that I must edit my HTML code for website to be Suitable to my app, how I can do this without conflict with the style for my website? Also, what is the basic steps to using jQTouch ? just Add scripts and Initialize as here : http://code.google.com/p/jqtouch/wiki/GettingStarted . help me with many thanks.

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