developer notes - Page 253

How to start with NOSQL using .net programming languages?

- by Amr ElGarhy

just was reading this article http://highscalability.com/blog/2010/3/23/digg-4000-performance-increase-by-sorting-in-php-rather-than.html And found this nice article http://wiki.apache.org/cassandra/DataModel I just want to know as a .net developer how to deal with NOSQL, and somethings like cassandra. I found that cassandra is apache product, is there something like this in microsoft world? or articles to know how to deal with cassandra using .net?

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Frame load interrupted error while loading a word document in UIWebView

- by Mugunth Kumar

I want to load a word document using UIWebView. I used the code provided in http://developer.apple.com/iphone/library/qa/qa2008/qa1630.html to load the document. But not all the documents load successfully. Sometimes I get an error Error Domain=WebKitErrorDomain Code=102 UserInfo=0x145bc10 "Frame load interrupted" The error seems to be very sporadic and I get this error only for some documents. However the same document loads correctly in mail.app. What am I missing?

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Problem with jQuery in Internet Explorer 8

- by Tim Cosgriff

I am trying to get my jQuery functions to work on IE8. I am loading the library from google's servers (http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js). The $(function(){}) is never called. Instead, I get an error "Object expected". I opened the developer and ran "typeof $" in the console, and it came up as "undefined". I have tried going to other sites that I know use jQuery (jquery.com), and those all work, is there something I might be missing here?

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Drawing the call stack in a recursive method

- by Shaza

Hey, I want to draw the call stack for any recursive method, so I've created a schema like this, recursiveMethod(){ //Break recursion condition if(){ // Add value here to the return values' list- No drawing return } else{ //Draw stack with the value which will be pushed to the stack here variable <- recursiveMethod() //Clear the drawing which represents the poped value from the stack here return variable }} Notes: This schema can draw recursive methods with n recursive call by making the recursive calls in a separate return statements. returnValues list, is a list which save all the return values, just for viewing issues. What do you think of this? any suggestions are extremely welcomed.

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How to add WCF templates to Visual Studio Express?

- by Mike Kantor

I am working through the book Learning WCF by Michele Bustamante, and trying to do it using Visual Studio C# Express 2008. The instructions say to use WCF project and item templates, which are not included with VS C# Express. There are templates for these types included with Visual Studio Web Developer Express, and I've tried to copy them over into the right directories for VS C# Express to find, but the IDE doesn't find them. Is there some registration process? Or config file somewhere?

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Correct permutation cycle for Verhoeff algorithm

- by James

Hello, I'm implementing the Verhoeff algorithm for a check digit scheme, but there seems to be some disagreement in web sources as to which permutation cycle should form the basis of the permutation table. Wikipedia uses: (36)(01589427) while apparently, Numerical Recipies uses a different cycle and this book uses: (0)(14)(23)(56789), quoted from a 1990 article by Winters. It also notes that Verhoeff used the one Wikipedia quotes. Now, my number theory is a little rusty, but the Wikipedia cycle clearly will repeat after the 8th power, while the book one will take 10, despite it saying that s^8=s. Table 2.14(b) has other errors in the 2-cycles, so this is dubious anyway. Unfortunately, I don't have copies of the original articles (and am too tight to pay/disgusted that 40-year old knowledge is still being held to ransom by publishers), nor a copy of Numerical Recipes to check (and am loath to install their paranoia-induced copy protection plug-in to view online). So does any one know which is correct? Are they both correct?

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How can I use fossil (DVCS) in a home environment?

- by Mosh

I'm trying fossil as my new VCS, since I'm a lone developer working on small projects. I started testing fossil but I encountered a (probably major newbie) problem. How does one push or pull to another directory (which is easy on Hg). Fossil pull or push commands expect a URL and not a directory. When I start a server in one directory and try to push from another directory I get the "server loop" error message. Any ideas?

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Erlang "must-have" development tools

- by Jonas

I am not a professional Erlang developer (not yet), but I would like to hear what Erlang development tools are "must-have" in the industry (besides emacs and git/mercurial) ? I do know about a few tools like: rebar, dialyzer, hipe, eunit and edoc but I have no idea if they are used by professional erlang developers or if there are other tools that are "must-have". This question is inspired by Java "must-have" development tools

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Where do I start with distributed computing?

- by folone

I'm interested in learning techniques for distributed computing. As a Java developer, I'm probably willing to start with Hadoop. Could you please recommend some books/tutorials/articles to begin with?

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How to create a UserProfile form in Django with first_name, last_name modifications ?

- by Natim

If think my question is pretty obvious and almost every developer working with UserProfile should be able to answer it. However, I could not find any help on the django documentation or in the Django Book. When you want to do a UserProfile form in with Django Forms, you'd like to modify the profile fields as well as some User field. But there is no forms.UserProfileForm (yet?) ! How do you do that ?

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MVC - Calling Controller Methods

- by JT703

Hello, My application is following the MVC design pattern. The problem I keep running into is needing to call methods inside a Controller class from outside that Controller class (ex. A View class wants to call a Controller method, or a Manager class wants to call a Controller method). Is calling Controller methods in this way allowed in MVC? If it's allowed, what's the proper way to do it? According to the version of MVC that I am following (there seems to be so many different versions out there), the View knows of the Model, and the Controller knows of the View. Doing it this way, I can't access the controller. Here's the best site I've found and the one describing the version of MVC I'm following: http://leepoint.net/notes-java/GUI/structure/40mvc.html. The Main Program code block really shows how this works. Thanks for any answers.

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How to avoid clobbering files when creating a tar archive

- by Andrew Grimm

This question notes that it is possible to overwrite files when creating a tar archive, and I'm trying to see how to avoid that situation. Normally, I'd use file roller, but the version installed is playing up a bit (using 1.1 Gb of memory), and I'm not the system administrator. I looked at --confirmation and --interactive, but that only asks me if I want to add file x to the archive, not whether I want to overwrite an existing file. For example, tar --interactive -czvf innocent_text_file.txt foo* Will ask me about each file, but is perfectly happy to overwrite innocent_text_file.txt Is there any switch that acts like -i for cp? Note I am asking about creating an archive, not extracting an archive. Clarification What I'm worried about is accidentally doing something like this tar -czvf * #Don't do this! which would overwrite the first file listed in the glob. To avoid it, I want tar to complain if the first file mentioned already exists, like cp -i * #Don't do this! would check if it would cause you to overwrite an existing file.

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API to determine cell carrier?

- by Chris Lively

Is there a free API or some other way to determine what carrier a cell phone number is registered with? I'd like my application to broadcast text messages without them picking their carrier from a list. UPDATE: Interestingly, a coworker found the answer: http://developer.whitepages.com/ UPDATE2: Well the whitepages license agreement is so restrictive that you can't build an app for it. Any other ideas?

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ASP.NET MVC hosting problem, routing, handlers and modules

- by johnabs

Hi, This is one of them again, hosting with fasthosts. I recently purchased a windows developer package from them. When I tried to deploy my ASP.NET 3.5 MVC project, which was working fine with the same host on a reseller account, it is not working. The reason to move from reseller to a normal Windows Developer package is, the MS-SQL server database is too expensive in a reseller account, strange! I contact them, and they are saying they upgraded the control panel. The technical support said, I need to disable the Modules and Handlers from the web.config file. Also I need to deploy them as .dll files. I am not sure how to do that. The website is partially working now. I think the problem is now with the routing. I have not deployed any .dlls apart from the System.Web.Mvc.dll, System.Web.Routing.dll and System.Web.Abstractions.dll. I have not got a clue on how to deploy the Modules and Handlers. The code that I commented on the web.config file is as follows.  Anybody got any ideas please. Thank you for your time.

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gwt rounded panel (standards based widget akin to DecoratorPanel)

- by brad

I'm trying to write an app that uses rounded corners for framing the app. I've found a package on google code that has a RoundedLinePanel and it seems to work... kind of. I'm wondering a few things. Is this what people are using for creating divs with round corners in GWT? The release notes say it hasn't changed in almost a year. Also, I can't seem to set a fixed height of this div (setHeight sets it on the wrapper div, not the inner one). so it's not useful to me as I have a fixed height app. Finally, if anyone can suggest a better mechanism for creating rounded corner divs in GWT I'm all ears.

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Any example on how to implement the new VerificationController and the KNOWN_TRANSACTIONS_KEY constant?

- by Carles Estevadeordal

I've been looking at implementing the new VerificationController to verify in-App-Purchases: http://developer.apple.com/library/ios/#releasenotes/StoreKit/IAP_ReceiptValidation/_index.html And I wonder if there is some example anywhere en how to validate a transaction, since it seems that the - (BOOL)verifyPurchase:(SKPaymentTransaction *)transaction; is not enough and it has to be implemented internally to verify the purchase when the data form the server is received. Another question is if anyone has a clue on what the KNOWN_TRANSACTIONS_KEY is and how to fill it, is it just the product id of the purchase?

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Abstraction is for lame programmers ? [closed]

- by Zaban Khuli

Hi, there's this senior developer in my company who's (in his own opinion) a pretty good C programmer. I happen to be from functional background (ML, to be specific) and so for me composition and abstraction are the two basic elements of programming. But this MrSmartyPants has got some kind of superiority complex and he'd always argue with me that abstraction is for lame programmers and _real_ programmers do not need it. Is it a problem with this guy or all C programmers have this opinion that abstraction is for lame programmers?

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What are some viable alternatives to BizTalk Server?

- by Kilhoffer

In evaluating different systems integration strategies, I've come across some words of encouragement, but also some words of frustration over BizTalk Server. What are some pros and cons to using BizTalk Server (both from a developer standpoint and a business user), and should companies also consider open source alternatives? What viable alternatives are out there? EDIT: Jitterbit seems like an interesting choice. Open Source and seems to be nicely engineered. Anyone on here have any experience working with it?

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Pro JavaScript programmer interview questions

- by WooYek

What are good questions to determine applicant is really a pro JavaScript developer? Questions that can distinguish if someone is not an ad-hoc JavaScript programmer, but is really doing professional JavaScript development, object-oriented, reusable, and maintainable.

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scroll image using UIscrollview

- by summer

i looked at the example from the iphone dev: http://developer.apple.com/iphone/library/samplecode/Scrolling/index.html everything looks cool except that for 5 image they set the "const NSUInteger kNumImages = 5;" what happens is that what if i have 1000 images?and i wan to view it without having to change the number everytime?also if i will to set the number to 1000 and i have only 10 images then in the simulator the user can scroll "blank view" till it reaches count 1000! help please..thanks

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What does it mean to "preconcat" a matrix?

- by Brad Hein

In reviewing: http://developer.android.com/reference/android/graphics/Canvas.html I'm wondering translate(): "preconcat the current matrix with the specified translation" -- what does this mean? I can't find a good definition of "preconcat" anywhere on the internet! The only place I can find it is in the Android Source - I'm starting to wonder if they made it up? :) I'm familiar with "concat" or concatenate, which is to append to, so what is a pre-concat?

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Objective-C and its relation to C

- by Daziplqa

Hi folks, Actually, I am very new to Mobile programming, and need to take your opinions. I am a Java Developer with a C background, and I need to start Learning Objective-C with a target to do mobile app for iPhone and to refresh my knowledge in C (as I know, Objective-C is a pure superset for C, ain't it?). So, the question is, With objective C, can I achieve my two objectives which are again: Do mobile dev for iPhone refresh my refresh my knowledge with C

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ASP.NET MVC Validation of ViewState MAC failed

- by Kevin Pang

After publishing a new build of my ASP.NET MVC web application, I often see this exception thrown when browsing to the site: System.Web.Mvc.HttpAntiForgeryException: A required anti-forgery token was not supplied or was invalid. --- System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. --- System.Web.UI.ViewStateException: Invalid viewstate. This exception will continue to occur on each page I visit in my web application until I close out of Firefox. After reopening Firefox, the site works perfectly. Any idea what's going on? Additional notes: I am not using any ASP.NET web controls (there are no instances of runat="server" in my application) If I take out the <%= Html.AntiForgeryToken % from my pages, this problem seems to go away

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Hacking your own application

- by instigator

I am a web developer that is very conscious of security and try and make my web applications as secure as possible. How ever I have started writing my own windows applications in C# and when it comes testing the security of my C# application, I am really only a novice. Just wondering if anyone has any good tutorials/readme's on how to hack your own windows application and writing secure code.

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TortoiseSVN 1.6.8 missing repository browser in Branch/Tag "To URL" dialog?

- by Ash

It seems that in TortoiseSVN 1.6.8 (on Windows), when you click the "To URL..." button in the Branch/Tag dialog, it now pops up a generic "browse for folders" dialog. It used to pop up a Repository Browser. Displaying a regular folder browser isn't much use, since you can't navigate to any of the tags/branches via the file system. Does anyone know if this is a regression or a deliberate change? Any possible workarounds (other than reverting to 1.6.7, which works fine)? Notes: I am running a repository on the local file system, which may yield different results to one going across a network. I'm definitely using an FSFS repository, so changes to BDB access via file:/// shouldn't apply. The only reference I could find to this problem is here: http://groups.google.com/group/tortoisesvn/browse_thread/thread/f3406d1bad89f1d9.

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