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• Using Accelerometer in Wiimote for Physics Practicals

  - by Omar

  I have to develop some software in my school to utilize the accelerometer in the Wiimote for recording data from experiments, for example finding the acceleration and velocity of a moving object. I understand how the accelerometer values will be used but I am sort of stuck on the programming front. There is a set of things that I would like to do: Live streaming of data from the Wiimote via bluetooth Use the accelerometer values to find velocity and displacment via integration Plot a set of results Avoid the use of the infrared sensor on the Wiimote Please can anyone give me their thoughts on how to go about this. Also it would be great if people could direct me to existing projects that utizlise the wiimote. Also can someone suggest what would be the best programming language to use for this. My current bet is on using Visual basic. Any sort of help is greatly appretiated.

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• sqL table is sorted by default

  - by Pramodtech

  I have simple SSIS package where I import data from flat file into sql table(MS sql 2005). File contains 70k rows and table has no primary key. Importing is sucessful but when I open sql table the order of rwos is different from the that of file. After observing closely I see that data in table is sorted by default by first column. Why this is happening? and how I can avoid default sort? Thanks.

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• Using an EJB inside a JAX-RS resource class in RestEasy?

  - by Laird Nelson

  I would like to have the following kind of resource class work when deployed under RestEasy in JBoss 6: @Path("Something") public class Foo { @EJB private SomeService service @GET public Object frobnicate() { assert service != null; // JBoss blows up here return result; } } Two questions: It is a limitation of RestEasy, not of the Java EE specification, right, that RestEasy can't inject anything annotated with @EJB? What have people done to work around this limitation? My developers are about to surge forward with hard-coded JNDI lookups (e.g. context.lookup(someHardCodedNameHere)) because no one can find a workaround to this specification violation at the present time. I really want to avoid this. Lastly, I've looked at using CDI, but the story here isn't much better as RestEasy and CDI still aren't talking to each other. Thanks in advance for any pointers.

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• Custom roles in ASP.NET

  - by MainMa

  Hi, I am working on an ASP.NET website which uses forms authentication with a custom authentication mechanism (which sets e.Authenticated programmatically on protected void Login_Authenticate(object sender, AuthenticateEventArgs e)). I have an ASP.NET sitemap. Some elements must be displayed only to logged in users. Others must be displayed only to one, unique user (ie. administrator, identified by a user name which will never change). What I want to avoid: Set a custom role provider: too much code to write for a such basic thing, Transform the existing code, for example by removing sitemap and replacing it by a code-behind solution. What I want to do: A pure code-behind solution which will let me assign roles on authenticate event. Is it possible? How? If not, is there an easy-to-do workaround?

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• Easily switching ConnectionStrings on publish to Azure

  - by David Pfeffer

  I'm currently building an Azure Web Role. I am testing this project against a local database server on localhost. Then, when confident that the project is working, I publish it to Staging on Windows Azure. However, I also have to remember to change the connection string to point to the live SQL server on SQL Azure before deploying, and then change it back to localhost afterwards. Is there any nice way to automate this, or perhaps a different process to take to avoid the issue altogether? For example is there a way to have a configuration file for Azure that isn't updated with every deploy?

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• a full-screen UIImagePickerController with the right scale?

  - by Kay

  Hi, I'm customizing my image picker controller and I want to have a full-screen viewfinder. I think this might be pretty an old topic and I found an answer here: http://www.gorbster.net/blog/archives/144 But what I want to know is if there's a way to achieve this without distorting the scale of the image. If I scale that clipped preview image, I'm distorting its original x-y ratio, and I want to avoid it. Is there a way to prevent the preview image from being clipped so that I could retain the original 1200x1600 ratio? Thanks!

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• Adding HTML to the DOM through the client.

  - by Mantorok

  Hi all Just wanted your views on the most efficient way to render content on demand, the reason this has come to light is that I'm maintaining a AA compliant website and we recently added video to it, and one of the techniques to avoid invalidation was to add the HTML for the video to the DOM after the page has loaded - which is fine and working ok. However, I found 2 possible techniques and I would appreciate some views, the one I'm currently using is an AJAX call that returns the HTML, the other technique is a hidden field that contains the HTML - I'm presently using the former. The main reason I'm asking the question is because there may be times when this particular control is also requested via an AJAX call, so I would end up with back-to-back AJAX calls, which seems a bit inefficient to me. I hope this makes sense, are there any better techniques to achieve this? Am I worrying too much over the consecutive AJAX calls? Thanks

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• YII Mail Generate unwanted ascii character in HTML mail

  - by CedSha

  I use YII-Mail just by copying the sample but I always get some ascii charcters in my generated links Where they come from and how to avoid them ? $message = new YiiMailMessage; $message->view = 'mail'; $message->setBody(array('model'=>$model), 'text/html'); $message->subject = Yii::t('tr','my subject'); $message->addTo('[email protected]'); $message->from = '[email protected]'; Yii::app()->mail->send($message); and in view file 'mail' <h1><?php echo(Yii::t('tr','This is HTML mail')); ?></h1> <?php echo CHtml::link('Mylink', array('controller/view', 'id'=>$model->id)); ?> The resulted email source looks like this <h1>This is HTML mail</h1> <a href=3D"/testdrive/index.php?r=3D ....

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• What are some of best Javascript memory detecting tools?

  - by Philip Fourie

  Our team is faced with slow but serious Javascript memory leak. We have read up on the normal causes for memory leaks in Javascript (eg. closures and circular references). We tried to avoid those pitfalls in the code but it likely we still have unknown mistakes left in our code. I started my search for available tools but would like input from people with actual experience with these tools. Some of the tools I found so far (but have no idea how good and useful they would be for our problem): Sieve Drip JavaScript Memory Leak Detector Our search is not limited to free tools, it will be a bonus, but more importantly something that will get the job done. We do the following in our Javascript code: AJAX calls to a .NET WCF back-end that send back JSON data Manipulate the DOM Keep a fairly sized object model in the Javascript to store current state

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• How do I apply css for textboxes only but not for all the <input> types like CheckBoxes, etc.?

  - by George

  If all browsers supported attribute selectors, we could easily do the following: input[type='text'] { font:bold 0.8em 'courier new',courier,monospace; } input[type='radio'] { margin:0 20px; } input[type='checkbox'] { border:2px solid red; But I don't think all IE versions of ^ and greater support this. I think I'd like to avoid skins. Not sure why, other than I tried them and I recall having a negative experience. It was probably my lack of knowledge. Are there any issues in using and CSS, external or otherwise? What's the best way to handle this? Currently I am assigning separate classes to each control type.

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• Visual Studio 2008 adding incorrect working folders to TFS Workspace

  - by Bryan Rowe

  I am using Visual Studio 2008 with TFS. I have one workspace set up with one working folder. I map the root source control folder $/ to C:\TFS and get all code. When working on any project under the root, Visual Studio will randomly add incorrectly mapped working folders to my workspace. For example, it might map $/WebProject/ to C:\TFS\WebProject\DataAccess -- where the real files exist at C:\TFS\WebProject. Once it incorrectly adds these working folders, I can no longer open the solution. I am forced to remove the working folders that Visual Studio added and get latest from TFS. Has anyone experienced this? Is there something I can do to avoid running into this?

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• memory alignment issues with union

  - by confucius

  Hi all, Is there guarantee, that memory for this object will be properly aligned if we create this object of this type in stack? union my_union { int value; char bytes[4]; }; If we create char bytes[4] in stack and then try to cast it to integer there might be alignment problem. We can avoid that problem by creating it in heap, however, is there such guarantee for union objects? Logically there should be, but I would like to confirm. Thanks.

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• Actionscript 3 : XML cached in local testing

  - by Boun

  Hi, My question is about XML loading. I need to avoid xml caching. On a web server, the technique is adding a random param to reload each time the XML file. But on local testing (in Flash CS4 IDE, CTRL + Enter), the following lines are not possible : var my_date : Date; path = "toto.xml?time="+my_date.getSeconds()+my_date.getMilliseconds(); Is there any trick to bypass this issue ? I've read on different forum about the "delete" method, we delete the xml object and then recreate one new. In my case, I put : myXML = null; myXML = new XML ( loadedData ); But it doesn't work at all. I spent many hours on that problem, if anyone has a good solution... Thank you.

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• Inherit static properties in subclass without redeclaration?

  - by David

  Hi, I'm having the same problem as this guy with the application I'm writing right now. The problem is that static properties are not being inherited in subclasses, and so if I use the static:: keyword in my main class, it sets the variable in my main class as well. It works if I redeclare the static variables in my subclass, but I expect to have a large number of static properties and subclasses and wish to avoid code duplication. The top-rated response on the page I linked has a link to a few "workarounds", but it seems to have 404'd. Can anyone lend me some help or perhaps point me in the direction of said workarounds?

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• Need alternative field names for these reserved words

  - by MattSlay

  “type” and “class” are likely reserved or problematic words in C# and/or Ruby, two languages I may use to program against my new database schema in the future. So, in order to avoid potential conflicts with those languages, I’m looking for alternative names for these field names in my tables. In this case, it is from my Machines table, where I have: “class” field (values would be something like “manual” or “computerized”) and “type” field (values would be “lathe” or “mill”) I could call the fields “machineclass” and “machinetype”, but that is inconsistent with naming scheme in the rest of my schema (meaning, I do not re-use the table name in the field… For instance, I use Machine.name, not Machine.machinename) Any thought on this madness?

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• Need a list of all countries in the world, with a longitude and latitude coordinate

  - by ptrn

  I need a list of all the countries in the world, with one lat/long coordinate for the country. I had a look at GeoNames, but all I can seem to find are lists that have the countries as well as cities in the same list. I guess I can just parse it and filter out the countries, but I was hoping to avoid that. Basically, what I need; Country name - Lat/long coordinate (some sort of center of the country) It doesn't need to say anything about continent, but I wouldn't mind if it did. _L

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• Removing a result from Queryset

  - by Enrico

  Is there a simple way to discard/remove the last result in a queryset without affecting the db? I am trying to paginate results in Django, but don't know the total number of objects for a given query. I was planning on using next/previous or older/newer links, so I only need to know if this is the first and/or last page. First is easy to check. To check for the last page I can compare the number of results with the pagesize or make a second query. The first method fails to detect the last page when the number of results in the last set equals the pagesize (ie 100 records get broken into 10 pages with the last page containing exactly 10 results) and I would like to avoid making a second query. My current thought is that I should fetch pagesize + 1 results from the db. If the queryset length equals 11, I know this is not the last page and I want to discard the last result in the queryset before passing the queryset to the template.

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• Virtual StringTree's hint windows are left out on the screen

  - by Edwin

  Hi, See this screenshot, in the middle it's the small hint windows that are generated by a TVirtualStringTree control and were left out on the screen, these hint windows will remain there until the application exits. the problem happens when the treeview's hint is shown and the mouse leaves quickly to the window next to it. Any idea about how to avoid this or how to clear those un-erased hint windows if it's difficult to avid this? Few days ago I asked a similar question, while the hint windows in the screenshots look the same, the are not the same problem. That problem, the hint text never shows and only that kind of uncompleted hint windows are shown; This problem, the hint text shows but the hint windows are not completely erased in a case (as I described above). Hope it's clear.

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• simple photo viewer

  - by Blaise

  Hi, I am fairly new to all this. I am trying to make a simple photo viewer with javascript or anything easy to alter. I just want a next and prev. button to take you between photos. Click next and next photo shows. Just that simple. I have a flash version but I would like to avoid using flash. I've been doing it the long way by making multiple pages, one for each photo and a button that repeats. I know there must be a better way but I just can't seem to figure it out. Please help

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• Changing RubyGems Install Path

  - by kmurph79

  I'm using RVM. I recently updated RubyGems and it seems to have changed my install path. Currently RubyGems looks in /Users/kmurph79/.rvm/gems/ruby-1.9.1-p376 for gems, yet installs them in /Users/kmurph79/.rvm/rubies/ruby-1.9.1-p376/lib/ruby/gems/1.9.1/gems. Currently I have them all symlinked, but I'd like to avoid doing that everytime I install a gem. I tried editing .gemrc to have RubyGems look in the latter directory, but that didn't work (maybe I didn't do that correctly? Here is my current .gemrc file). Ideally I'd like to change the install path to the former directory -- is there an easy way to do this? Thanks for any help!

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• GWT application throws an exception when run on Google Chrome with compiler output style set to 'OBF

  - by Elifarley

  I'd like to know if you guys have faced the same problem I'm facing, and how you are dealing with it. Sometimes, a small and harmless change in a Java class ensues strange errors at runtime. These errors only happen if BOTH conditions below are true: 2) the application is run on Google Chrome, and 1) the GWT JavaScript compiler output style is set to 'OBF'. So, running the application on Firefox or IE always works. Running with the output style set to 'pretty' or 'detailed' always works, even on Google Chrome. Here's an example of error message that I got: "((TypeError): Property 'top' of object [object DOMWindow] is not a function stack" And here's what I have: - GWT 1.5.3 - GXT 1.2.4 - Google Chrome 4 and 5 - Windows XP In order to get rid of this Heisenbug, I have to either deploy my application without obfuscation or endure a time-consuming trial-and-error process in which I re-implement the change in slightly different ways and re-run the application, until the GWT compiler is happy with my code. Would you have a better idea on how to avoid this?

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• How to find good looking font color if background color is known?

  - by Mecki

  There seem to be so many color wheel, color picker, and color matcher web apps out there, where you give one color and the they'll find a couple of other colors that will create a harmonic layout when being used in combination. However most of them focus on background colors only and any text printed on each background color (if text is printed at all in the preview) is either black or white. My problem is different. I know the background color I want to use for a text area. What I need help with is choosing a couple of colors (the more, the merrier) I can use as font colors on this background. Most important is that the color will make sure the font is readable (contrast not being too low, also maybe not being too high to avoid that eyes are stressed) and of course that the combination of foreground and background just looks good. Anyone being aware of such an application? I'd prefer a web application to anything I have to download. Thanks.

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• Why Switch/Case and not If/Else If?

  - by OB OB

  This question in mainly pointed at C/C++, but I guess other languages are relevant as well. I can't understand why is switch/case still being used instead of if/else if. It seems to me much like using goto's, and results in the same sort of messy code, while the same results could be acheived with if/else if's in a much more organized manner. Still, I see these blocks around quite often. A common place to find them is near a message-loop (WndProc...), whereas these are among the places when they raise the heaviest havoc: variables are shared along the entire block, even when not propriate (and can't be initialized inside it). Extra attention has to be put on not dropping break's, and so on... Personally, I avoid using them, and I wonder wether I'm missing something? Are they more efficient than if/else's? Are they carried on by tradition?

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• How can I access IEnumerable<T> extension methods on my custom subclass of BindingList<T>?

  - by Dan

  I have a custom subclass of BindingList<T> that I want to execute a LINQ query over using the handy extension methods. For example: public int GetSum(MyList<T> list) { return list.Sum(x => x.Value); } But the compiler complains that it can't resolve Sum because it doesn't recognize list as an IEnumerable<T>, which it obviously is, because this works: public int GetSum(MyList<T> list) { return ((IEnumerable<T>)list).Sum(x => x.Value); } Anyone have a clever way I can avoid the ugly and unecessary cast?

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• How do I override ToString in C# enums?

  - by scraimer

  In the post Enum ToString, a method is described to use the custom attribute DescriptionAttribute like this: Enum HowNice { [Description("Really Nice")] ReallyNice, [Description("Kinda Nice")] SortOfNice, [Description("Not Nice At All")] NotNice } And then, you call a function GetDescription, using syntax like: GetDescription<HowNice>(NotNice); // Returns "Not Nice At All" But that doesn't really help me when I want to simply populate a ComboBox with the values of an enum, since I cannot force the ComboBox to call GetDescription. What I want has the following requirements: Reading (HowNice)myComboBox.selectedItem will return the selected value as the enum value. The user should see the user-friendly display strings, and not just the name of the enumeration values. So instead of seeing "NotNice", the user would see "Not Nice At All". Hopefully, the solution will require minimal code changes to existing enumerations. Obviously, I could implement a new class for each enum that I create, and override its ToString(), but that's a lot of work for each enum, and I'd rather avoid that. Any ideas? Heck, I'll even throw in a hug as a bounty :-)

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