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• Question regarding the ExtJS License

  - by stephemurdoch

  Let's say I create a CMS that uses ExtJS. I want to avoid the license fee, so I open-source the CMS on github. Now let's imagine that I make your friend Dave a website that uses my CMS. I spend three hundred hours designing a logo and designing the layout. Can I charge a fee for this, and would I be obliged to open-source Dave's website too or is it enough to just open-source the CMS? I find this LPGL license a little confusing. Say hi to Dave for me.

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• Windows Phone 7, MVVM, Silverlight and navigation best practice / patterns and strategies

  - by Matt F

  Whilst building a Windows Phone 7 app. using the MVVM pattern we've struggled to get to grips with a pattern or technique to centralise navigation logic that will fit with MVVM. To give an example, everytime the app. calls our web service we check that the logon token we've assigned the app. earlier hasn't expired. We always return some status to the phone from the web service and one of those might be Enum.AuthenticationExpired. If we receive that I'd imagine we'd alert the user and navigate back to the login screen. (this is one of many examples of status we might receive) Now, wanting to keep things DRY, that sort of logic feels like it should be in one place. Therein lies my question. How should I go about modelling navigation that relies on (essentially) switch or if statements to tell us where to navigate to next without repeating that in every view. Are there recognised patterns or techniques that someone could recommend? Thanks

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• Future proof Primary Key design in postgresql

  - by John P

  I've always used either auto_generated or Sequences in the past for my primary keys. With the current system I'm working on there is the possibility of having to eventually partition the data which has never been a requirement in the past. Knowing that I may need to partition the data in the future, is there any advantage of using UUIDs for PKs instead of the database's built-in sequences? If so, is there a design pattern that can safely generate relatively short keys (say 6 characters instead of the usual long one e6709870-5cbc-11df-a08a-0800200c9a66)? 36^6 keys per-table is more than sufficient for any table I could imagine. I will be using the keys in URLs so conciseness is important.

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• Creating a data driven web front end quickly

  - by Ilya

  Over the last few years, I can't count how many web front ends I've had to create over a relatively simple database schema to fasciliate data entry. I have to imagine that someone out there has written a framework I can use to simplify the creation of these kind of simple GUIs. Doing a quick google, the following look like the key players in .net: ASP.Net dynamic data framework SubSonic NakedObjects for .net Has anyone worked with any of these and have any preferences? More importantly, are there other frameworks that would be good to evaluate in this space?

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• C - how to get fscanf() to determine whether what it read is only digits, and no characters

  - by hatorade

  Imagine I have a csv with and each value is an integer. so the first value is the INTEGER 100. I want fscanf() to read this line, and either tell me it's an integer ONLY, or not. So, it would pass 100 but fail on 100t. What i've been trying to get work is "%d," where the comma is the delimiter of my CSV. so the whole function is fscanf(fp, "%d,", &count) Unfortunately, this fails to fail on '100t,' works on '100' and works on 't'. so it just isn't distinguishing between 100 and 100t (all of these numbers are followed by commas, of course

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• How to Create a Generic Method and Create Instance of The Type

  - by DaveDev

  Hi Guys I want to create a helper method that I can imagine has a signature similar to this: public static MyHtmlTag GenerateTag<T>(this HtmlHelper htmlHelper, object obj) { // how do I create an instance of MyAnchor? // this returns MyAnchor, which has a MyHtmlTag base } When I invoke the method, I want to specify a type of MyHtmlTag, such as MyAnchor, e.g.: <%= Html.GenerateTag<MyAnchor>(obj) %> or <%= Html.GenerateTag<MySpan>(obj) %> Can someone show me how to create this method? Also, what's involved in creating an instance of the type I specified? Activator.CreateInstance()? Thanks Dave

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• Wicket : Can a Panel or Component react on a form submit without any boilerplate code?

  - by MRalwasser

  I am currently evaluating Wicket and I am trying to figure out how things work. I have a question regarding form submit and panels (or other components). Imagine a custom wicket panel which contains a text field, doing as-you-type validation using ajax. This panel is added to a form. How can the Panel react a form submit (let's say because javascript/ajax is unavailable)? I am currently only aware of one solution: calling a panel's method inside the Form onSubmit() method. But this seems not like a "reusable" approach here, because I have to add boilerplate code to every form's onSubmit() which contains the panel (and every developer which use the panel must know this). So here comes my question: Is there any way that a Panel/Component can "detect" a form submit in some way? Or is there any other solution beside this? Thank you.

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• What methods are used to visualize a 4-dimensional Array?

  - by Atomiton

  An Array ( a row of elements ): [ ][ ][ ][ ][ ][ ] A 2-D Array ( a table ): [ ][ ][ ][ ][ ][ ] [ ][ ][ ][ ][ ][ ] [ ][ ][ ][ ][ ][ ] [ ][ ][ ][ ][ ][ ] A 3-D Array: //Imagine the above table as a cube ( a table with depth ) How does one visualize a 4-D array? The closest I can come is multiple cubes, so for int[,,,] [5,10,2,7] would be cube 5, row 10, column 2, layer(depth) 7. I'm not sure if this is the best way to visualize a 4-D array, though... and I'm not sure it's the best way to teach it... however it does have the advantage of being extensible ( a row cubes, a table of cubes, a cube of cubes ( 6-d array ) Cubes through time is another way that I can think of it. Am I on the right track here?

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• My javascript to jQuery translation has a bug

  - by donpal

  My guess is that this javascript just finds the div called divid and then uses it with the sendit function. var somevalue = 19; if (navigator.appName.indexOf("Microsoft") != -1) { thediv = window["divid"]; } else { thediv = document["divid"]; } thediv.sendit(somevalue); I would imagine in jQuery it would look something as simple as this: var somevalue = 19; $('divid').sendit(somevalue); But it's not working!! What could I be missing? I should say that it's in the middle of other javascript code, could that be a problem?

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• How to implement buffering with timeout in RX

  - by Gaspar Nagy

  I need to implement an event processing, that is done delayed when there are no new events arriving for a certain period. (I have to queue up a parsing task when the text buffer changed, but I don't want to start the parsing when the user is still typing.) I'm new in RX, but as far as I see, I would need a combination of BufferWithTime and the Timeout methods. I imagine this to be working like this: it buffers the events until they are received regularly within a specified time period between the subsequent events. If there is a gap in the event flow (longer than the timespan) it should return propagate the events buffered so far. Having a look at how Buffer and Timeout is implemented, I could probably implement my BufferWithTimeout method (if everyone have one, please share with me), but I wonder if this can be achieved just by combining the existing methods. Any ideas?

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• How would I access the Windows Login (Authentication) API from a C++ Service Application?

  - by Gabriel

  Let us imagine for a moment that I have a piece of hardware that can act as an authentication for a user on a given system. I want to write an application in C++ to run as a service, look for this device and if found log the appropriate user in. I believe I have found the API's I would need to use to perform the hardware and service portions of the application but am having a hard time nailing down a way to create a "real" user login. Is this possible? If so where would I look to find resources on accomplishing this? I think of it as being an analog to fingerprint scanner login type devices.

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• simile exhibit ie7 bug

  - by two7s_clash

  'm using to Exhibit to, pretty simply, display some data on historical events and book publication dates: http://f1shw1ck.com/timeline3/exhibit.html Everything works fine, and I have been able to get the timeline running as wanted, until I try to take control of the timeline with a timelineConfig script. After I add this, my timeline continues to work as expected on all browsers, except for IE. Curiously enough, band 0 initializes and is rendered correctly, but band 1 shows no events and does not sync to the band above. But it is picking up the width: 10%", intervalUnit: Timeline.DateTime.DECADE, intervalPixels: 60 specifications, as they are rendered correctly. Since everything works until I call ex:configuration="timelineConfig", since everything works in the other browsers, and since everything almost works in IE, up to the event painting, I have to imagine this is a javascript coding error on my part, but I just can't see it. All I get in my console is Failed to create view View As Timeline." Incidentally, having or not having the gotoYear function seemingly does nothing to change... Thanks for any tips.

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• How to set a reference from one object to another?

  - by Tzur Gazit

  Hi, Imagine the obvious model of employees and departments, where each employee must refer to a single department, and each department may have none to many employees. For Employee I have a pointer to Department, and I set its value to the address of the object of the relevant Department. When I try to save the Employee I get an error: 2010-04-07 10:05:22.491 CoreData2[1112:207] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[NSCFDictionary setObject:forKey:]: attempt to insert nil value (key: Department)' I tried, just for testing, to make the reference from Employee to Department optional, but I get the same result. I'm having my first steps in CoreData so please be as clear and simple as you can. Thanks, Tzur.

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• Good conventions for embedding schema of a flat file

  - by Ville Koskinen

  We receive lots of data as flat files: delimitted or just fixed length records. It's sometimes hard to find out what the files actually contain. Are there any well established practices for embedding the schema of the file to the beginning or the end of a file to make the file self-explanatory? Just to get an idea, imagine something like this: <data name=test records=2 type=fixed> <field name=foo start=0 length=2 type=numeric> <field name=bar start=2 length=4 type=text> </data> 11test 12ing We would parse the xml in the beginning and use it for reading the records.

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• v8 is too slow for my purpose

  - by Scott

  I'm working on a music visualization plugin for libvisual. It's an AVS clone -- AVS being from Winamp. Right now I have a superscope plugin. This element has 4 scripts, and "point" is run at every pixel. You can imagine that it has to be rather fast. The original libvisual avs clone had a JIT compiler that was really fast, but it had some bugs and wasn't fully implemented, so I decided to try v8. Well, v8 is too slow running the compiled script at every pixel. Is there any other script engine that would be pretty fast for this purpose?

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• Is programming in PHP easy?

  - by nik

  PHP is considered as an easy language of all, Why? Being an php developer, I haven't use any other language that much. And I know with php we gotta learn so much other things also like javascript ajax xml database jquery + all the cms like joomla, drupal, phpbb etc etc. And in web worls u always had to learn injecting maps, calendars, payment gatewaysetc Do learning other languages have these much dependencies? And if php easy than isn't it good thing to have easy language. I can't imagine to built a website in assembly language(Is it possible?)

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• 3D effect to distort paper

  - by donpal

  This may be a little hard to describe since I don't have a sample. I'm trying to find a math function or full 3d function in php or a similar language that can help me with the following effect: imagine if you were to take a flat sheet or paper and glue it on a glass of water. It wouldn't be flat any more. It would have a curve, and one of its sides might end up being slightly hidden. Anyone can refer me to a good library or resource on the web where such functions can be found?

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• Enumerate Class Properties in C#

  - by user275561

  I have a class Similar to this public class Model { public TimeSpan Time1 {get; set;} public TimeSpan Time2 { get; set; } public TimeSpan Time3 { get; set; } public TimeSpan Time4 { get; set; } } Now Let's Imagine I have to populate the times during runtime and then Figure out the time remaining between Time 1 and Time 2, then when that passes Find the time remaining between Time2 and Time3 and so on. However, I need to take into account what the time is right now. For Example: Now it is 1:00 PM Time1=5:00 AM Time 2 = 12:00 PM Time 3= 4:00 PM Time 4 = 6:00 PM So since the time is 1:00PM, I need to find the difference between Time 2 and Time 3 Now is there a smarter way other than reflection to determine this? Should i add something in my class

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• How to create a custom ADO Multi Demensional Catalog with no database

  - by Alan Clark

  Does anyone know of an example of how to dynamically define and build ADO MD (ActiveX Data Objects Multidimensional) catalogs and cube definitions with a set of data other than a database? Background: we have a huge amount of data in our application that we export to a database and then query using the usual SQL joins, groups, sums etc to produce reports. The data in the application is originally in objects and arrays. The problem is the amount of data is so large the export can take 2 hours. So I am trying to figure out a good way of querying the objects in memory, either by a custom OLAP algorithm or library, or ADO MD. But I haven't been able to find an example of using ADO MD without a database behind it. We are using Delphi 2010 so would use ADO ActiveX but I imagine the ADO.NET MD is similar. I realize that if the application data was already stored in a database the problem would solve itself. Also if Delphi had LINQ capability I could query the objects and arrays that way.

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• What are the precise rules/PHP function for encoding strings into POST arrays?

  - by AlexeyMK

  Greetings, Just getting into PHP web development. I've got an HTML form where a user checks some series of dynamically-generated checkboxes, and submits via POST. On the PHP side, I want to check which of the check-boxes were clicked. I have an array $full_list, and am doing something like $selected_checkboxes = array_filter($full_list, function($item) { array_key_exists($item, $_POST); } I run into problems when a list item is named, for example "Peanut Butter", since in the POST array it is named "Peanut_Butter". I could certainly just str_replace " " with "_" before checking array_key_exists, but I imagine that there is a more fundamental encoding problem here; specifically, I'm not sure of exactly what layer transforms normal strings in HTML Forms (value="Peanut Butter") into "Peanut_Butter". So: what layer is responsible for this conversion? Is it the browser? what are the exact conversion rules, and is there a PHP function out there that will replicate that exact conversion? Thanks!

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• Size of Objects in Java Heap w/ Regards to Methods

  - by Eric

  I know about primitives and objects living on the heap, but how does the number of methods effect heap size of the object? For example: public class A { int x; public getX() { return x; } } public class B { int x; public getX() { return x; } public getXString() { return String.valueOf(x); } public doMoreInterestingStuff() { return x * 42; } //etc } When instantiated, both objects live on the heap, both have memory allocated to their primitive x, but is B allocated more heap space due to having more method signatures? Or are those ONLY on the classLoader? In this example its trivial, but when there are 100,000+ of these objects in memory at any given time I imagine it could add up.

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• Capturing USB Plug/Unplug events in Firemonkey

  - by radsdau

  [RAD Studio XE3 / C++] I have a FMX project running in Windows only at this stage, but I need to detect events when USB devices are connected and disconnected. I have a similar VCL app that can do this fine, but the Application-HookMainWindow is not exposed in FMX (only VCL). Is there an elegant way to handle this? Or do I have to hack some VCL stuff into my FMX app to make that work? I'd imagine I have to abstract it so I can support other platforms down the track. For the meantime though I need to get the Windows solution working. If the 'VCL hack' thing is required, how would I reference the vcl::Forms::Application from within my Fmx app? Cheers.

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• Protect files from svn commit.

  - by chrsk

  Hey, imagine a plain webapp with a log4j.properties which is under version control. I can't add it to svn:ignore because its a mandatory file. If i make custom changes for development and i don't want to commit them, i have to watch out for accidently commits. For one file it's easy to handle, with 3 or more files it becomes creepy. Is there a way to disable these files temporary from svn commit? So its easiert to commit? I'm working with svn and subclipse.

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• clickable div with img in it?

  - by acidzombie24

  I have a div i would like to make clickable. I know i need to make the div (and?) the link have a fixed width and height + display: block. I have an imagine inside of the div. It seems like the 'clickable' div is actually a large transparent link and this click does not play well with images as it doesnt share space. I need to right click the image and hit save as. So how do i make the div clickable. I tried setting the img width and height but it made the img stretch.

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• Linux periodically "losing" ability to connect to server via SSH?

  - by gct

  I know this isn't exactly a programming question, but it popped up in my use of git for programming projects at least. I've got a web server that I use to host my git repos on, but my ubuntu box seems to "lose" the ability to connect to it via SSH. I'll get a "connection refused" error when I try to ssh or use git. Rebooting my local machine will fix the problem, but only temporarily. I can still connect to the web interface just fine, and the problem manifests with other servers as well. I've been working around it by pulling my changes over to my laptop and pushing from there, but that's sub-optimal as you can imagine. Has anyone seen something like this? I'd be tempted to say it's some kind of IP caching problem, but I can't connect even using the IP address of the server directly... Running Ubuntu 9.04

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