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• Delphi 2010: whatever happened to TRTTIConstructor?

  - by conciliator

  I've got two questions (of which at least one is regarding RTTI in D2010 and dynamic instancing) I was reading what appears to be the foils for a conference talk by Barry Kelly, and found on p. 13 something that looked really interesting: TRTTIConstructor.Invoke. In an adjacent bullet point, on finds "Dynamically construct instances without needing virtual constructors and metaclasses". This seems like a great feature (and exactly what I need, btw)! However, when I look in the D2010 docs (ms-help://embarcadero.rs2010/vcl/Rtti.html), I can't find it. Did it get revoked? What is the minimal way of creating an instance of a class, provided the class name is stored in a string?

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• Use only some parts of Django?

  - by Hanno Fietz

  I like Django, but for a particular application I would like to use only parts of it, but I'm not familiar enough with how Django works on the inside, so maybe someone can point me into the right direction as to what I have to check out. Specifically, I want to use: The models and database abstraction The caching API, although I want to avoid database lookups by caching, not HTML generation, and since the caching framework in Django is intended for the latter, I'm not sure yet whether that's really appropriate. I would not use: Templating urlconfigs Or, more exactly, I'm neither using HTTP nor HTML. So basically, I have a different input / output chain than usual. Can this work? My personal killer feature in Django is the Object / database mapping that I can do with the models, so if there's another technology (doesn't have to be Python, I'm in the design phase and I'm pretty agnostic about languages and platforms) that gives me the same abilities, that would be great, too.

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• Loop to LINQ Conversion -

  - by Pino

  Ok I have the following, set-up and working great. These lines of code should do a conversion from DAL Entity (Subsonic) to a ViewModel. IList<ProductOptionModel> OptionsRetData = new List<ProductOptionModel>(); foreach (var CurProductOption in this.ProductOptions) { OptionsRetData.Add(CurProductOption.ToDataModel()); } returnData.Options = OptionsRetData.AsEnumerable(); I'd like to convert this to a LINQ single line statment and came up with the following. returnData.Options = this.ProductOptions.Select(o => o.ToDataModel()); and am recieving the following error. Server Error in '/' Application. Sequence contains no matching element So why does the first statment work but not the LINQ and, what steps can I take to resolve it.

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• Implements an Undo/Redo in MVC

  - by bnabilos

  Hello, I have a Java application and I want to implement an Undo/Redo option. the value that I want to stock and that I want to be able to recover is an integer. My Class Model implements the interface StateEditable and I have to redefine the 2 functions restoreState(Hashtable<?, ?> state) and storeState(Hashtable<Object, Object> state) but I don't know what to put on them. It will be really great if somebody can help me to do that. These are the first lines of my Model class, the value that I want to do an undo/redo on it is value public class Model extends Observable implements StateEditable { private int value = 5; private UndoManager undoRedo = new UndoManager(); final UndoableEditListener editListener = new UndoableEditListener() { public void undoableEditHappened(UndoableEditEvent evt) { undoRedo.addEdit(evt.getEdit()); } }; @Override public void restoreState(Hashtable<?, ?> state) { } @Override public void storeState(Hashtable<Object, Object> state) { } }

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• Code completion in NetBeans' python plugin does not work properly

  - by T.K.

  I am asking on StackOverflow because surely I am doing something completely silly and I hope S.O. might provide me with a quick answer. I've installed the latest stable Python-plugin for NetBeans. It works great, and I tested code completion with various packages such as sys, os and so on. It works beautifully. However, it does not seem to pick up the code completion for the code in my own project. I created a package called mypackage (it has _init_.py as well), and in it I have a module called mymodule.py. Inside mymodule I've put a class called MyClass, complete with doc-strings and all. Please refer to this screenshot to describe what happens in code-completion: As you see, it's suggesting irrelevant things, as opposed to just MyClass. (Note that if I execute mymodule.MyClass() it works 100%, it's just that I would really like code completion on my own code) Hope I'm just doing something silly here... Any ideas?

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• Redundancy algorithm for reading noisy bitstream

  - by Tedd Hansen

  I'm reading a lossy bit stream and I need a way to recover as much usable data as possible. There can be 1's in place of 0's and 0's in palce of 1's, but accuracy is probably over 80%. A bonus would be if the algorithm could compensate for missing/too many bits as well. The source I'm reading from is analogue with noise (microphone via FFT), and the read timing could vary depending on computer speed. I remember reading about algorithms used in CD-ROM's doing this in 3? layers, so I'm guessing using several layers is a good option. I don't remember the details though, so if anyone can share some ideas that would be great! :) Edit: Added sample data Best case data: in: 0000010101000010110100101101100111000000100100101101100111000000100100001100000010000101110101001101100111000101110000001001111011001100110000001001100111011110110101011100111011000100110000001000010111 out: 0010101000010110100101101100111000000100100101101100111000000100100001100000010000101110101001101100111000101110000001001111011001100110000001001100111011110110101011100111011000100110000001000010111011 Bade case (timing is off, samples are missing): out: 00101010000101101001011011001110000001001001011011001110000001001000011000000100001011101010011011001 in: 00111101001011111110010010111111011110000010010000111000011101001101111110000110111011110111111111101 Edit2: I am able to controll the data being sent. Currently attempting to implement simple XOR checking (though it won't be enough).

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• Wrap link around links in tweets with php preg_replace

  - by Ben Paton

  Hello I'm trying to display the latest tweet using the code below. This preg_replace works great for wrapping a link round twitter @usernames but doesn't work for web addresses in tweets. How do I get this code to wrap links around urls in tweets. <?php /** Script to pull in the latest tweet */ $username='fairgroceruk'; $format = 'json'; $tweet = json_decode(file_get_contents("http://api.twitter.com/1/statuses/user_timeline/{$username}.{$format}")); $latestTweet = htmlentities($tweet[0]->text, ENT_QUOTES); $latestTweet = preg_replace('/@([a-z0-9_]+)/i', '<a href="http://twitter.com/$1" target="_blank">@$1</a>', $latestTweet); $latestTweet = preg_replace('/http://([a-z0-9_]+)/i', '<a href="http://$1" target="_blank">http://$1</a>', $latestTweet); echo $latestTweet; ?> Thanks for the help, Ben

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• How do you energize yourself when working alone on a project?

  - by Stephane

  I am working in an environment with a very small team (3 developers only) and each of us have been assigned a different project, without counting support tasks. I know this is a bad business practice and that we should all work on a single project at a time, and then move on to the next one (Already explained to the management on how much it sucks). So don't answer me that we should work all together on one project at a time. Energizing the work when in a team is mostly pair programming we did that when less project were thrown at us and that was great. What I would like to know is how you energize your work when working alone on a project. Do you follow any particular practice?

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• SSIS - Update flag of selected rows from more than one table

  - by Rob Bowman

  Hi I have a SSIS package that copies data from table A to table B and sets a flag in table A so that the same data is not copied subsequently. This works great by using the following as the SQL command text on the ADO Net Source object: update transfer set ProcessDateTimeStamp = GetDate(), LastUpdatedBy = 'legacy processed' output inserted.* where LastUpdatedBy = 'legacy' and ProcessDateTimeStamp is not null The problem I have is that I need to run a similar data copy but from two sources table, joined on a primary / foreign key - select from table A join table B update flag in table A. I don't think I can use the technique above because I don't know where I'd put the join! Is there another way around this problem? Thanks Rob.

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• Changing constraints on the fly

  - by GoinOff

  Hi, I have a dijit.form.NumberTextBox input field that starts out with these parms: new dijit.form.NumberTextBox({ id: din1, style: "width:60px", constraints: { places: 0, pattern: '######' } }, din1); Everything works great..My question is I would like to change 'places' and 'pattern' parms on the fly. So I wrote this to change 'places' and 'patterns' parms: var myFldObj = dijit.byId(din1); if (myFldObj) { var myConstObj = myFldObj.attr('constraints'); if (myConstObj) { myConstObj.places = 2; myConstObj.pattern = '#####.0'; } } So, after I show the form again, I'd expect the entry field to allow 2 decimal places but the form still acts like places=0 and pattern='######'. When I check the values of 'places' and 'pattern' I get what I'd expect (2 and #####.0). My question: Can you change these values on the fly?? OR Do you have to destroy the original dijit object and recreate with new parms?? Thx!!

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• Linking IronPython to WPF

  - by DonnyD

  I just installed VS2010 and the great new IronPython Tools extension. Currently this extension doesn't yet generate event handlers in code upon double-clicking wpf visual controls. Is there anyone that can provide or point me to an example as to how to code wpf event handlers manually in python. I've had no luck finding any and I am new to visual studio. Upon generating a new ipython wpf project the auto-generated code is: import clr clr.AddReference('PresentationFramework') from System.Windows.Markup import XamlReader from System.Windows import Application from System.IO import FileStream, FileMode app = Application() app.Run(XamlReader.Load(FileStream('WpfApplication7.xaml', FileMode.Open))) and the XAML is: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WpfApplication7" Height="300" Width="300"> <Button>Click Me</Button> </Window> Any help would be appreciated.

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• Where is the default language data stored in OS 10.6

  - by George Baugh

  From a shell in 10.4 or 10.5, I was able to do this: /usr/bin/defaults read NSGlobalDomain AppleLanguages To get the list of the language preference for that particular machine. This was done so that I could restore it back to that list after changing it with the 'defaults write' command to something else (in order to help automate l10n testing). Now, along comes OS 10.6, and AppleLanguages is nowhere in any of our defaults domains. I know that I can alter it for each running application by altering their specific property lists...but at the cost of more complexity. Also, some of the apps I have under test here are installer packages...and It's a real pain to change stuff (like the .plist I'd have to change here) in those without being somewhat destructive; that's why I chose to do it globally in the first place. Anyways, it'd be great if I could find where they stashed it now...or if they deprecated it (like a zillion other things in OS 10.6) completely.

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• Where does Visual Studio stores the default browser to use in debug?

  - by Fabian Vilers

  Hi all, I'm using Firefox as my default browser but when working in Visual Studio, I'd like to fire up IE when I go in debug. We all know that in MVC application, there's no way to choose the default browser unless you add a web form file, right click it, select browse with and then force a browser to be the default one. Great. My simple question is: where does VS stores the browser I just tell him to use (registry? project file? some xml config file?) I'm asking because VS loose this preference several times a month. I'm fed up with making the brower trick again and again. Thanks in advance, Fabian

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• VSTO: Attach meta-data to a cell in Excel?

  - by Gustav

  Hi! I'm using VSTO to create an Excel Add-on. This add-on retrieves and display alot of data from a sql-server. This works great, but later on I plan to access some of the data inside excel and modify it in some ways. My problem is that I need a way of classify cells that I want to modify. Is there any way to add meta-data to a cell to know if it is a cell that should be modified? E.g. add a attribute to the cell, e.g. "editable_cell", and do something like Excel.FindCellsWithAttribute("editable_cell") to find the sought after cells? Thanks! /Gustav

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• R6034: An application has made an attempt to load the C runtime library incorrectly.

  - by mattias

  I am getting this R6034 error when running program that I just updated (and cleaned) from VS2003 - VS2008. To be more exact: "R6034: An application has made an attempt to load the C runtime library incorrectly." It seems to happed almost at the same place all the time when running. I have no really idea why but I tried some suggestions I found when googleing this. For example adding the msvc dlls, but that didn't work. Any help on why this error occurs would be great. Thanks

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• Android - Connectivity Questions

  - by Donal Rafferty

  I have a couple of questions about connectivity on Android, if anyone has any insight it would be great. What is the default when an application wants to wirelessly connect? Is it wlan? And if wlan is switched off or there is no access points around is it 3g or gprs? Is a device always ip connected? Or when its disabled from wlan or 3g does it lose its ip address? Is an application, for example the browser only ever connected to one ip address? Or can it be connected to multiple addresses for each radio such as gprs or wifi (wlan)? Can an application decide which connection to open a socket to? For example can I create an application and decide whether to connect the socket to the wlan or gprs? Or does the OS decide? Finally how do native applications handle connectivity? In the same manner?

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• Fade effect onclick (jQuery)

  - by Nimbuz

  I have this very basic tabbed block: $('.tabbed-section .panel').hide(); $('.tabbed-section .panel:first').show(); $('.tabbed-section .tabs li:first').addClass('active'); $('.tabbed-section .tabs li a').click(function () { $('.tabbed-section .tabs li').removeClass('active'); $(this).parent().addClass('active'); var currentTab = $(this).attr('href'); var tab_id = $(this).attr('href'); $(this).closest('#hero').attr('class', 'clear ' + tab_id.replace('#', '')); $('.tabbed-section .panel').hide(); $(currentTab).show(); return false; }); .. it works great, but can I add fade effect when the active tab changes? I think there's a plugin (innerfade) for it but I want to avoid using another plugin if possible. Also, can the jQuery above be compacted further? Thanks for your help!

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• Refresh backend in GWT development

  - by T.K.

  I am developing a GWT application that uses EJB and other Java EE 6 technology as the backend. I am currently using the GWT 2.0 plugin for Safari. When I change my GWT client side code and save in my IDE (NetBeans), all that's required is a simple reload in the browser for the changes to become active. That works great! However, often I work on the server-side (the EJBs, GWT server code, etc) and then something in on the GWT client side. Any changes done to the server-side do not appear to incrementally deploy to the Glassfish V3 server. Currently I close the GWT Development Mode application, and then recompile the EJBs, and then go back into GWT Development mode. That is tedious. Any better way of doing this? I tried the "deploy on save" option in NetBeans but it does not seem to do the trick.

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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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• How do I pass a reference type to Control.Invoke / display a form centered on the main form

  - by Rubio

  I'm on a thread other than the UI thread and need to display a modal form that's centered on the application's main form. What I usually do is use the width and height of the main form and the modal form to calculate the location, then use the PointToScreen method of the main form to get the location of the modal form. Since I'm on another thread I need to use Control.Invoke to call this method. I just can't figure out how to pass a parameter of type Point to Control.Invoke (params object[]). Value types and String works fine. Or, if someone can find a better way to display a form centered on the main form regardless of thread, that would be great. MessageBox seems to be able to do this (although not modally).

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• Fake "user initiated" <audio> tag on iPad

  - by Alex Ford

  I know that Apple's docs say that an mp3 within an <audio tag on iPhone OS can't be played without user intervention (they cite bandwidth concerns, totally reasonable). However, has anyone succeeded in faking a user action to play the audio? Perhaps faking events to off screen native audio controls with JavaScript? I'm using jPlayer right now which works great on desktop Safari, but is silent on my iPad. I'm prototyping a touch interface using WebKit on the iPad, and audio is an integral part of the experience, so yes, I do have a good reason to want to override this convention. I'd appreciate any help. Thanks.

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• microsoft windows driver kit pure C try catch syntax ?

  - by clyfe

  In the Windows Driver Kit (WDK) there are some driver code samples written in pure C, but sprinkled with some try-catch-finally constructs. Does someone know their semantics ? Thank you microsoft for your great tools and standards compliance. Code extract from some_file.c: try { ... if (!NT_SUCCESS( status )) { leave; // ??? } ... } finally { ... } try { ... } except( EXCEPTION_EXECUTE_HANDLER ) { ... }

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• Is there anJoomla extensions that works like Yahoo! Groups??

  - by Dion

  Hello all, Can anybody suggests me any extensions for Joomla that works like Yahoo!Groups?? I needed an extensions that : 1. If i post a new subject, everybody on the subscription list get that new subject/article/post on their e-mail. 2. The subscriber/receiver of that mail, can reply it directly from their e-mail (yahoo, gmail, outlook, etc)...and, their reply shows on the website front end. Basically, like Yahoo! Groups did... I've tried "Acajoom", and "Ultimate Mailing List"....both worked great for creating a newsletter, subscription, and sending mail to all the subscriber. But i cannot reply the e-mail and showed the reply on the website, and the other receiver didn;t receive it too...so there is absolutely no interaction within the mailing list. If anyone can suggest me something, i will be very grateful Thanx!!

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• Implementing OFX specification with javascript

  - by John Langston

  Hey all, I am working on a personal project and need to retrieve financial data. After looking around how this is normally done it seems you can pay lots of money and license a service like Yodlee to get this data for you or you can implement a OFX client like wesabe has to communicate with financial institutions. Seeing as I don't have lots of money and wouldn't mind the challenge I decided to try to implement the ofx spec (unless one of you can suggest a cheap/free alternative!). I looked around for some ofx libraries other people have already written for use but didn't find anything that looked too great. I was wondering if anyone knew if it would be a bad idea to attempt this in Javascript (using XMLSocket from actionscript to handle the actual socket communication). If there is some really bad reason why I shouldn't do this please bring it up. If there is I'll just do it in Java but I think it would be neat to have it completely in javascript so it runs client-side. Anyways I was hoping for some helpful input, thanks.

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• Jquery DateJs, is there validation for full date?

  - by Cesar Lopez

  Hi all, I just find out about the power of date js, And its great!!! As I am a newbie I was wondering if there is any kind of general validitation for different types of full dates. eg. var d1 = Date.parse('2000-10-18, 10:06 AM'); alert(d1.toString('HH:mm')); If date is ('200-10-18, 10:06 AM'), of course it doesn't like it. So my question is if there is any quick way to validate the full date, rather than having to validate one by one. Thanks.

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