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• Learning about the low level

  - by Anoners

  I'm interested in learning more about the PC from a lower (machine) level. I graduated from a school which taught us concepts using the Java language which abstracted out that level almost completely. As a result I only learned a bit from the one required assembly language course. In order to cram in ASM and quite a few details about architecture, it was hard to get a very deep picture of what is going on there. At work I focus on unix socket programming in C, so i'm much closer to the hardware now, but I feel I should learn a bit more about what streams really are, how memory management and paging works, what goes on when you call "paint()" on a graphics buffer, etc. I missed out on a lot of this and i'm looking for a good resource to get me started. I've heard a lot about the "Pink Book" by Peter Norton (Programmer's Guide to the IBM PC, Programmer's Guide to inside the PC, etc). It seems like this is on the right track, however the original is quite out dated and the newer ones have had conflicting reviews, with many people saying to stay away from it. I'm not sure what the SO crowd thinks about this book or if they have some suggestions for similar books, online resources, etc that may be good primers for this sort of thing. Any suggestions would be appreciated.

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• Which book should I pick to improve my program designs/design patterns?

  - by zxcvbnm

  I want to learn about design patterns and from what I've seen the most recommended ones are the Gang of Four's Design Patterns and Head First Design Patterns. There are also language specific books, but I never see them recommended. I suppose it ties you to whatever strengths/weaknesses are inherent to each language, so not a good idea to learn design patterns in general. The Gang of Four's book is kinda old, so I'm wondering if there isn't a better alternative out today? I've heard the Heard First one isn't quite as good. But I'm not sure why, so it's really hard to pick either one. I've see some answers on this very site recommending both, but if I can only read one, which should I pick? I've been coding for 3+ years, though I've never had a good class on this subject. Also, would a book like Code Complete help me with this? One more thing: how often are these techniques supposed to be useful? For example, this question has me wondering if this stuff is worth the trouble. And please, tell me more than just "read x". I'd like to know why you're suggesting x.

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• Looking for a book which teaches how to write applications (as opposed to writng code)

  - by rumtscho

  I am not a developer. I have coded for fun and for university projects in several languages, and during an internship, I have written code which is still in use by a department of Fortune Global 500 company. I also have extensive theoretical knowledge of software engineering - process models, architecture, project management, UI construction using Lauesen's virtual windows... you get the picture. But I am not involved with software development in my job. I recently decided to start coding for fun again, and now I have some free days to do it. But this time, I want to do it right. I want to write a real, useful application, install it on my devices and use it myself. Also I want to publish it for others to use, should they want to do so. I am vaguely aware that there is more to writing an application than to writing code. There is stuff like version control software, decision for the right IDE, having a suite of unit tests, producing an installation package - and probably lots of other things I never thought of but which must be taken care of in a proper application, as opposed to a bunch of classes I am running from my IDE. All this is stuff I should know before I start, but I have not learned it. Coding books touch on some of the subjects like IDE choice, but don't go into detail, and are not exhaustive. Theoretical software engineering textbooks are even less helpful. So is there a book which teaches exactly that? I know that I can find information on each of these topics on the Internet, but I'd rather have a systematic book exhaustively listing all the things I should take care of if I want to create a good application, and offering the currently accepted solutions for them. In the best case, it will be language- and platform independent, but if you know of a good book focusing on a specific platform, I would like to know about it too. I know I want a lot, but given how important such knowledge is and how many people need it, surely somebody must have written such a book?

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• WCF RIA Services DomainContext Abstraction Strategies–Say That 10 Times!

  - by dwahlin

  The DomainContext available with WCF RIA Services provides a lot of functionality that can help track object state and handle making calls from a Silverlight client to a DomainService. One of the questions I get quite often in our Silverlight training classes (and see often in various forums and other areas) is how the DomainContext can be abstracted out of ViewModel classes when using the MVVM pattern in Silverlight applications. It’s not something that’s super obvious at first especially if you don’t work with delegates a lot, but it can definitely be done. There are various techniques and strategies that can be used but I thought I’d share some of the core techniques I find useful. To start, let’s assume you have the following ViewModel class (this is from my Silverlight Firestarter talk available to watch online here if you’re interested in getting started with WCF RIA Services): public class AdminViewModel : ViewModelBase { BookClubContext _Context = new BookClubContext(); public AdminViewModel() { if (!DesignerProperties.IsInDesignTool) { LoadBooks(); } } private void LoadBooks() { _Context.Load(_Context.GetBooksQuery(), LoadBooksCallback, null); } private void LoadBooksCallback(LoadOperation<Book> books) { Books = new ObservableCollection<Book>(books.Entities); } } Notice that BookClubContext is being used directly in the ViewModel class. There’s nothing wrong with that of course, but if other ViewModel objects need to load books then code would be duplicated across classes. Plus, the ViewModel has direct knowledge of how to load data and I like to make it more loosely-coupled. To do this I create what I call a “Service Agent” class. This class is responsible for getting data from the DomainService and returning it to a ViewModel. It only knows how to get and return data but doesn’t know how data should be stored and isn’t used with data binding operations. An example of a simple ServiceAgent class is shown next. Notice that I’m using the Action<T> delegate to handle callbacks from the ServiceAgent to the ViewModel object. Because LoadBooks accepts an Action<ObservableCollection<Book>>, the callback method in the ViewModel must accept ObservableCollection<Book> as a parameter. The callback is initiated by calling the Invoke method exposed by Action<T>: public class ServiceAgent { BookClubContext _Context = new BookClubContext(); public void LoadBooks(Action<ObservableCollection<Book>> callback) { _Context.Load(_Context.GetBooksQuery(), LoadBooksCallback, callback); } public void LoadBooksCallback(LoadOperation<Book> lo) { //Check for errors of course...keeping this brief var books = new ObservableCollection<Book>(lo.Entities); var action = (Action<ObservableCollection<Book>>)lo.UserState; action.Invoke(books); } } This can be simplified by taking advantage of lambda expressions. Notice that in the following code I don’t have a separate callback method and don’t have to worry about passing any user state or casting any user state (the user state is the 3rd parameter in the _Context.Load method call shown above). public class ServiceAgent { BookClubContext _Context = new BookClubContext(); public void LoadBooks(Action<ObservableCollection<Book>> callback) { _Context.Load(_Context.GetBooksQuery(), (lo) => { var books = new ObservableCollection<Book>(lo.Entities); callback.Invoke(books); }, null); } } A ViewModel class can then call into the ServiceAgent to retrieve books yet never know anything about the DomainContext object or even know how data is loaded behind the scenes: public class AdminViewModel : ViewModelBase { ServiceAgent _ServiceAgent = new ServiceAgent(); public AdminViewModel() { if (!DesignerProperties.IsInDesignTool) { LoadBooks(); } } private void LoadBooks() { _ServiceAgent.LoadBooks(LoadBooksCallback); } private void LoadBooksCallback(ObservableCollection<Book> books) { Books = books } } You could also handle the LoadBooksCallback method using a lambda if you wanted to minimize code just like I did earlier with the LoadBooks method in the ServiceAgent class.  If you’re into Dependency Injection (DI), you could create an interface for the ServiceAgent type, reference it in the ViewModel and then inject in the object to use at runtime. There are certainly other techniques and strategies that can be used, but the code shown here provides an introductory look at the topic that should help get you started abstracting the DomainContext out of your ViewModel classes when using WCF RIA Services in Silverlight applications.

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• base for setQueueXmlPath

  - by antony.trupe

  I can't figure out how to point unit tests at the queue config file. Unit Test snippet // TaskQueue setup LocalTaskQueueTestConfig tqConfig = new LocalTaskQueueTestConfig(); tqConfig.setQueueXmlPath("/war/WEB_INF/queue.xml"); Stack Trace java.lang.IllegalStateException: The specified queue is unknown : zip-fetch at com.google.appengine.api.labs.taskqueue.QueueApiHelper.translateError(QueueApiHelper.java:56) at com.google.appengine.api.labs.taskqueue.QueueApiHelper.translateError(QueueApiHelper.java:111) at com.google.appengine.api.labs.taskqueue.QueueApiHelper.makeSyncCall(QueueApiHelper.java:32) at com.google.appengine.api.labs.taskqueue.QueueImpl.add(QueueImpl.java:310) at com.google.appengine.api.labs.taskqueue.QueueImpl.add(QueueImpl.java:282) at com.google.appengine.api.labs.taskqueue.QueueImpl.add(QueueImpl.java:267) at ...

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• Geocoding autocomplete bias not working

  - by chris

  I'm using the following code to get the autocomplete functionality for an address input box using Google Maps API v3: function initializeAutocomplete() { var defaultBounds = new google.maps.LatLngBounds( new google.maps.LatLng(1.484016,103.575212), new google.maps.LatLng(1.233592,104.033618)); var input = document.getElementById('destStreet'); var myOptions = {bounds: defaultBounds, types: ['geocode']}; autocomplete = new google.maps.places.Autocomplete(input, myOptions); } The problem is that biasing doesn't seem to work as the first results are usually not relevant to the defined bounds (a country). I've seen a few apps working fine, so I'm wondering where the problem is. I came across the JQuery autocomplete plugin (http://code.google.com/p/geo-autocomplete/) which would seem like a good alternative since it has a region filter, but I'm unable to "install it" or use it because of my very limited knowledge (I learn by example). Could you please help me getting more relevant results with the above code or guide me through the implementation of the JQuery alternative? Of course I'm very open to other suggestions as well.

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• How do I prove to a client/advertiser that my site's analytics numbers are what I say they are?

  - by Bryson

  I have been asked to provide recommendations on "Verified Analytics" for the next iteration of my company's site. Verified to mean that when we sell ad space, it's based on a number of page-views, and the people who buy that space want a way to verify that the numbers we give them are the actual numbers we're delivering. I have turned to The Google and the only services I can find for this sort of thing revolve around Google Analytics and the sale of a domain name. I export my analytics numbers to a PDF, have Google email the PDF to my auctioneer, and they look for signs of tampering. If no signs of tampering are found they put a little "Verified" badge on the domain auction. (Here) Other than this, and something similar on another domain sales site, I haven't found anything like what I've been asked to find. Currently we are using Google Analytics, however I've been also asked to recommend a replacement for that based on the ability to be verified. I'd rather just stick with Google Analytics since we also use Google for advertising.

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• Cannot set focus on input field in infoWindow

  - by thomas

  Hi Why is focus not set to noteTitle? I am using google maps API V3. The getNoteForm() returns a input field "noteTitle". The $("#noteTitle").focus() works fine when executed in firebug. I call this function when clicking on the map: function setNewNoteInfowindow(latlng) { if (geocoder) { geocoder.geocode({'latLng': latlng}, function(results, status) { var address = ""; if (status == google.maps.GeocoderStatus.OK) { if (results[1]) { address = results[1].formatted_address; } } newNoteInfowindow = new google.maps.InfoWindow({ content: getNoteForm(latlng, address), size: new google.maps.Size(40,50) }); newNoteInfowindow.open(map, newNoteMarker); google.maps.event.addListener(newNoteInfowindow, 'domready', function() { $("#noteTitle").focus(); }); google.maps.event.addListener(newNoteInfowindow, 'closeclick', function() { newNoteMarker.setVisible(false); }); }); } }

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• KindError: Property r must be an instance of SecondModel, why ?

  - by zjm1126

  class FirstModel(db.Model): p = db.StringProperty() r=db.ReferenceProperty(SecondModel) class SecondModel(db.Model): r = db.ReferenceProperty(FirstModel) class sss(webapp.RequestHandler): def get(self): a=FirstModel() a.p='sss' a.put() b=SecondModel() b.r=a b.put() a.r=b a.put() self.response.out.write(str(b.r.p)) the error is : Traceback (most recent call last): File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 511, in __call__ handler.get(*groups) File "D:\zjm_code\helloworld\a.py", line 158, in get a.r=b File "D:\Program Files\Google\google_appengine\google\appengine\ext\db\__init__.py", line 3009, in __set__ value = self.validate(value) File "D:\Program Files\Google\google_appengine\google\appengine\ext\db\__init__.py", line 3048, in validate (self.name, self.reference_class.kind())) KindError: Property r must be an instance of SecondModel thanks

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• Friday Fun: Favorite Games to Play in Chrome

  - by Asian Angel

  Online games can provide a perfect break while you are working and being able to choose from a multitude of games makes it even better. If you are a game addict then you will definitely want to have a look at the Game Button extension for Chrome. Game Button in Action Once the extension has finished installing you are ready to enjoy all that gaming goodness. To get started just click on the “Toolbar Button” and choose a game category. For our example we chose “Shooting Games”. Once you select a game category a new window will open. Towards the lower right corner you will be able to access a scrollable drop-down menu and choose the game that you would like to play. Note: Some of these games come with sounds that can not be turned off so you may want to have the volume lowered all the way or your speakers temporarily turned off if you are at work. For our first game we chose “Snowball Throw”. Notice that there is a nice variety such as “DinoKids – Archery” to games like “Secret Agent”. You can see that our game was nicely sized…not too small and not too large. Go go snowballs! This is definitely a fun one to try…the best approach for this one is to use one hand for clicking the mouse and the other hand for moving it at the same time. If desired you can post your score and see other high scores afterwards. For our second game we decided to try “Target Shooter Firing Range”. This one is definitely a little harder because you have to be extremely precise while moving as quickly as possible. Not too bad for the score but that is ok. You will certainly be able to have fun finding the games that will become your favorites while enjoying the nice variety. Conclusion If you love online games and want a good variety to choose from then the Game Button extension will make a nice addition to your browser. Links Download the Game Button extension (Google Chrome Extensions) Similar Articles Productive Geek Tips Play a New Random Game Each Day in ChromeFriday Fun: Get Your Mario OnFriday Fun: Go Retro with PacmanFriday Fun: Play Air Hockey in Google ChromeFriday Fun: Five More Time Wasting Online Games TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Recycle ! Find That Elusive Icon with FindIcons Looking for Good Windows Media Player 12 Plug-ins? Find Out the Celebrity You Resemble With FaceDouble Whoa ! Use Printflush to Solve Printing Problems

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• Interesting links week #24 and #25

  - by erwin21

  Below a list of interesting links that I found this week: Interaction: Design Usability and All About It Frontend: CSS Lint – CSS Cleaning Tool 10 HTML Entity Crimes You Really Shouldn’t Commit Development: OWASP Top 10 for .NET developers part 7: Insecure Cryptographic Storage C#/.NET Fundamentals: Choosing the Right Collection Class Mobile: Tips to Design a Website for Mobile Marketing: 30 (New) Google Ranking Factors You May Over- or Underestimate Other: 5 Little-Known Web Files That Can Enhance Your Website Interested in more interesting links follow me at twitter http://twitter.com/erwingriekspoor

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• What exactly is an SEO badge and how does it help my SEO?

  - by ben geit

  Hi everyone! I'm using attracta.com as an SEO tool to try and improve my SEO. They say that I should use an SEO badge to improve my ranking but I don't really understand what it is or what it does (a quick Google search didn't provide too much information). I was just wondering if any of you guys here at stackoverflow had any information they would be able to impart to me. Thanks for your help!

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• [Video] Android Gingerbread Features Walkthrough

  - by Kavitha

  Google recently released Android 2.3 (aka Gingerbread) smartphone OS. Guys at Phone Arena released a video demo of the new features and enhancements of Gingerbread OS.Check and enjoy the Android Gingerbread walk trough video. This article titled,[Video] Android Gingerbread Features Walkthrough, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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• Managing 404 error pages with noindex and url rewrite

  - by ZenMaster

  Currently I use custom 404 error pages, having the following meta on them : <meta content="noindex" name="robots"> My guess is this way Google will remove deleted pages faster from the index, anyone has experienced a case where it does ? Also, is it better to have the url path rewritten to the actual error page, like the url pattern: http://{mysite}/{404_error_page} or is it best to keep the old deleted page's url when serving a 404 error ?

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• How to suppress PHPSESSID in URL for Googlebot?

  - by Roque Santa Cruz

  I use cookie based sessions, and they work for normal interaction with our site. However, when Googlebot comes crawling out PHP framework, Yii, needs to append ?PHPSESSID to each URL, which doesn't look that good in SERP. Any ways to suppress this behavior? PS. I tried to utilize ini_set('session.use_only_cookies', '1');, but it does not work. PPS. To get an impression of the SERP, they look like this: http://www.google.com/search?q=site:wwwdup.uni-leipzig.de+inurl:jobportal

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• How do I check user's unlocked achievement and leaderboard scores via GPG plugin

  - by noob

  I need to load user's achievement and their scores from leaderboard in my game. But the Social.LoadScore() and Social.LoadAchievements() both returns a 0 size array in callback. When I checked the implementation in Google Play Gaming's PlayGamePlatform.cs, both the method has this summary - Not implemented yet. Calls the callback with an empty list. So my question is How do I get this data in Unity? Has anyone tried any other method to get the data?

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• Using SEO to hide a website in a specific location?

  - by mickburkejnr

  Hi everyone, A friend of mine wants to build a website, but doesn't want people in the West Midlands area of the UK to be able to see it, but wants areas outside of the West Midlands to be able to see it. Is this possible? I know SEO can be used to target specific countries to improve search results, but could it be used to target specific areas inside a country and to basically remove the website from Google listings for a specific area? Cheers!

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• Suddenly I have started getting 404 wordpress errors

  - by rikki

  Suddenly I have started getting 404 error on Google Webmaster. The backend is wordpress. 404 link is http://digitalanalog.in/2011/07/05/augmented-reality-interior-designer-kinect-hack/1345295070000/1345781600000 and it is pointing from this page http://digitalanalog.in/2011/07/05/augmented-reality-interior-designer-kinect-hack/1345295070000/ (this url has been automatically generated. Have no clue how this url exist) I am getting 404 errors of the similar pattern on all the pages

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• Does GNC mean the death of Internet Explorer?

  - by Monika Michael

  From the wikipedia - Google Native Client (NaCl) is a sandboxing technology for running a subset of Intel x86 or ARM native code using software-based fault isolation. It is proposed for safely running native code from a web browser, allowing web-based applications to run at near-native speeds. (Emphasis mine) (Source) Compiled C++ code running in a browser? Are other companies working on a similar offering? What would it mean for the browser landscape?

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• Can someone help with indexing issues

  - by user631249

  Hi all I am on the first page of google for keywords concerned with MOVING, however i cant seem to break the carpet cleaning rankings. I have made changes and additions which havent been indexed yet. Should i wait for the run or please please can someone give me pointers on the carpet cleaning indexing. Also i have 53pages submitted and only 38 indexed, where could the problem be. Is there software to check indexing hiccups . Thanks.

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• YAHOO and BING support for Index, Image and Mobile sitemaps

  - by kishore

  I know Google webmaster supports submitting Image, mobile, video and other types of sitemaps. YAHOO also mentions about mobile site map here. But does it support Image and video sitemaps. I could not find if BING supports any of these types other than XML sitemaps. Can someone please point me to any documentation on submitting Index, Image and Mobile sitemaps. Also does YAHOO and Bing support index sitemap files?

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• Will ranking be affected with a mobile XML sitemap for a mobile site with canonical URLs?

  - by Emil Rasmussen

  We have a site with both a desktop version and a mobile version. Most of the content are the same and both versions have the same URL, but the HTML generated is device specific. Looking at Google's recommendations for smartphone-optimized sites, one could get the impression that the mobile xml sitemap is only for sites with different URLs. Will ranking be affected - negatively or positively - if we add a mobile xml sitemap that effectively will be a duplicate of the desktop sitemap?

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• % new visitor vs. % returning visitor

  - by Torben Gundtofte-Bruun

  I'm not sure how to interpret the results in Google Analytics. I understand that some metrics should be high, and some should be low. But this one I don't get: % new visitor vs. % returning visitor: It's good that users are returning, but surely it's also good to get new, fresh visitors. How do I evaluate this %-vs-% ratio? The higher the better: visits unique visitors pageviews pages per visit avg. visit duration The lower the better: bounce rate drop-offs

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• Will ranking be affected with a mobile XML sitemap for a mobile site with the same URLs as the desktop site?

  - by Emil Rasmussen

  We have a site with both a desktop version and a mobile version. Most of the content are the same and both versions have the same URL, but the HTML generated is device specific. Looking at Google's recommendations for smartphone-optimized sites, one could get the impression that the mobile xml sitemap is only for sites with different URLs. Will ranking be affected - negatively or positively - if we add a mobile xml sitemap that effectively will be a duplicate of the desktop sitemap?

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• Stop YouTube Videos from Automatically Playing in Chrome

  - by The Geek

  If you’ve actually used the internet before, you’ve probably come across a page with an auto-playing YouTube clip, and chances are good it was a rather annoying one. Here’s how to stop them from starting automatically in Chrome. We’ve already told you how to stop them from automatically playing if you’re a Firefox user (best answer: use Flashblock!), but now it’s time for Chrome users to get their turn. Use the Stop Autoplay for YouTube Extension The great thing about this extension is that it stops the video from playing, but it allows it to continue buffering, so when you do feel like playing the video, it’ll already be downloaded—really useful for people with slower internet connections. There’s no UI or anything fancy, just head to the extension page and click the Install button. If you want to get rid of it later, use the Tools –> Extensions menu (or you can type chrome://extensions/ into your address bar), and then click the Uninstall link for that add-on.   Download Stop Autoplay for YouTube [Google Chrome Extensions] Using FlashBlock for Chrome If you really wanted to, you could just disable Flash across the board using FlashBlock for Chrome. Once you’ve installed the extension, you won’t see any Flash elements anywhere, and you’ll have to move your mouse over them and click to enable them each time. When I installed the extension the first time, I noticed that YouTube was already in the allow list. I’m not sure if that’s the default setting or not, but you can use the icon in the address bar, or the Options from the Extensions panel to get to the settings page, and from there you can remove anything from the White List that you wouldn’t want. Another nice feature about Flash Block is that it can also block Silverlight, or you could simply uninstall or remove unnecessary Chrome plug-ins. Download FlashBlock for Chrome Similar Articles Productive Geek Tips Stop YouTube Videos from Automatically Playing in FirefoxDisable YouTube Comments while using ChromeApologies About An Awful Audio AdvertisementImprove YouTube Video Viewing in Google ChromeWatch YouTube Videos in Cinema Style in Firefox TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Follow Finder Finds You Twitter Users To Follow Combine MP3 Files Easily QuicklyCode Provides Cheatsheets & Other Programming Stuff Download Free MP3s from Amazon Awe inspiring, inter-galactic theme (Win 7) Case Study – How to Optimize Popular Wordpress Sites

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