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• What features are important in a programming language for beginners?

  - by NoMoreZealots

  I was talking with some of the mentors in a local robotics competition for 7th and 8th level kids. The robot was using PBASIC and the parallax Basic Stamp. One of the major issues was this was short term project that required building the robot, teaching them to program in PBASIC and having them program the robot. All in only 2 hours or so a week over a couple months. PBASIC is kinda nice in that it has built in features to do everything, but information overload is possible to due this. My thought are simplicity is key. When you have kids struggling to grasp: if X10 then There is not much point in throwing "proper" object oriented programming at them. What are the essentials needed to foster an interest in programming?

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• Using views as a data interface between modules in a database

  - by Stefan

  Hello, I am working on the database layout of a straighforward small database in Mysql. We want to modularize this system in order to have more flexiblity for different implementations we are going to make. Now, the idea was to have one module in the database (simple a group of tables with constraints between them) pass its data to the next module via views. In this way, changes in one module would not affect the other ones, as we can make sure in the view that the right data is present there at any time, although the underlying structure of tables might be different. The structure of the App handling the database would likewise be modularized. Is this something that is sometimes done? On a technical side, as I understand views can't have primary keys - how would I then adress such a view? What other issues should be considered?

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• Unit Testing Model Classes that inherit from NSManagedObject

  - by Matt Baker

  So...I'm trying to get unit tests set up in my iPhone App but I'm having some issues. I'm trying to test my model classes but they inherit directly from NSManagedObject. I'm sure this is a problem but I don't know how to get around it. Everything is building and running as expected but I get this error when calling any method on the class I'm testing: Unknown.m:0:0 unrecognized selector sent to instance 0xc2b120 If I follow this structure (http://chanson.livejournal.com/115621.html) to create my object in my tests I end up with another error entirely but it still doesn't help me. Basically my question is this: how can I test a class that inherits from NSManagedObject?

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• ILClone on Windows 2000

  - by 00010000

  Does anyone know of any issues with the ILClone() function on Windows 2000? Is it fully supported? MSDN says it runs on Windows 2000 but I have a user reporting that my program will not run on Windows 2000 because of that function. EDIT: I was able to get a hold of a Win2K system and I can confirm the issue. Shell32.dll version installed is 5.0.3700.6705. The error message shown when running the program is: The procedure entry point ILClone could not be located in the dynamic link library SHELL32.DLL

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• turning open source software into a consulting business ?

  - by sofreakinghigh

  just some general and specific questions about running a business which uses open source software and sells training, services, and other value added solutions utilizing the open source asset(s). 1) how much modification do you need to make to an existing open source software/framework to give a new brand ? open source (GPLv3) branding issues here.... for ex) Mambo and Joomla, i think they are pretty much same ? but they have different labels. 2) Is there a disadvantage of promoting open source software/framework/suite in hopes of selling value added services and solutions on top of the Open source asset ? 3) can Open source assets be marketing point for lowered Total Ownership Cost and transparency ? meaning, clients will not be using some mysterious, opaque proprietary asset ? 4) is competition fierce? cost of developing software is non existing because you are using an open source asset. barrier to entry is minimal ??

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• Is frameworks really necessary for this problem?

  - by The Elite Gentleman

  Hi Guys I'm creating an online music store application (in Java) for signed and unsigned artist for my client. I'm currently using Struts 1.3.10 (I was recommended Spring but Spring setup is sort of similar to Struts) for my Web application. My Database is currently a MySQL 5 (or higher) and I'm using a DAO pattern to talk to it. There are limitations to using Struts and DAO's (e.g. Multiple File upload in Struts is not implemented the same way as multiple String parameters, and for DAO's, there lacks a Publish-Subscribe feature). Is what I'm doing the best way forward or should I go straight Hibernate (or similar) and move out of Struts? What are the performance implications or technical issues that you've experienced with the same setup I have? The client doesn't care how I do it as long as it is done.

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• What are the alternative ways to export excel file

  - by fealin

  i m trying to generate an excel file from my web page but i have some issues with Turkish chars such as "I" "g" when i open the file some chars are incorrect (I seems Ä°) here is my code gvExpRequests.DataSource = dsExpRequests; gvExpRequests.DataBind(); gvExpRequests.GridLines = GridLines.Both; Page.EnableViewState = false; Response.Clear(); Response.AddHeader("content-disposition", "attachment;filename=export.xls"); Response.ContentType = "application/ms-excel"; Response.ContentEncoding = Encoding.UTF8; Response.BinaryWrite(Encoding.UTF8.GetPreamble()); StringWriter yaz = new StringWriter(); HtmlTextWriter htw = new HtmlTextWriter(yaz); gvExpRequests.RenderControl(htw); i don't know what's wrong with here i tried a lot of encoding but i got same results every time i want to try something different to do this are there any another way to export a excel file from a gridview

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• SharePoint - DIP problem on local copies downloaded from the portal

  - by user255234

  Our users have issues where the Document Information Panel(DIP) appears on Word, Excel, PPT documents. Here is the scenario: User downloads a copy of a template from the portal to his/her local hard drive. User edits that template and renames the file, again saving it to his/her local drive. User continues to edit and update that new document, and it continues to prompt him/her for document information as if the user was saving it on the portal. User clicks the “X” to remove this DIP bar, the next time he/she opens the local file it comes back. Is there anything I can do to make the DIP NOT SHOW on the local copies? Thanks!

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• Read/Write protected memory?

  - by PenguinBoy

  I'm trying to learn C++ currently, but I'm having issues with the code below. class Vector2 { public: double X; double Y; Vector2(double X, double Y) { this->X = X; this->Y = Y; }; SDL_Rect * getSdlOffset() { SDL_Rect * offset = new SDL_Rect(); offset->x = this->X; offset->y = this->Y; return offset; }; }; Visual studio throws throw the following error when calling getSdlOffset() An unhandled exception of type 'System.AccessViolationException' occurred in crossEchoTest.exe Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. I've got a C#/java background, and I'm lost... Any help would be much appreciated.

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• LINQ expression precedence with Skip(), Take() and OrderBy()

  - by Robert Koritnik

  I'm using LINQ to Entities and display paged results. But I'm having issues with the combination of Skip(), Take() and OrderBy() calls. Everything works fine, except that OrderBy() is assigned too late. It's executed after result set has been cut down by Skip() and Take(). So each page of results has items in order. But ordering is done on a page handful of data instead of ordering of the whole set and then limiting those records with Skip() and Take(). How do I set precedence with these statements? My example (simplified) var query = ctx.EntitySet.Where(/* filter */).OrderBy(/* expression */); int total = query.Count(); var result = query.Skip(n).Take(x).ToList();

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• .Net Logger (Write your own vs log4net/enterprise logger/nlog etc.)

  - by Jack

  I work for an IT department with about 50+ developers. It used to be about 100+ developers but was cut because of the recession. When our department was bigger there was an ambitious effort made to set up a special architecture group. One thing this group decided to do was create our own internal logger. They thought it was such a simple task that we could spend recources and do it ourselves. Now we are having issues with performance and difficulty viewing the logs generated and some employees are frustrated that we are spending recources on infrastructure stuff like this instead of focusing on serving our business and using stuff that already exists like log4net or Enterprise Logger. Can you assist me in listing up reasons why you should not create your own .net logger. Also reasons for why you should are welcome to get a fair point of view :)

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• Loading all files in a directory in a Java applet

  - by WarrenB

  How would one go about programatically loading all the resource files in a given directory in a JAR file for an applet? The resources will probably change several times over the lifetime of the program so I don't want to hardcode names in. Normally I would just traverse the directory structure using File.list(), but I get permission issues when trying to do that within an applet. I also looked at using an enumeration with something line ClassLoader.getResources() but it only finds files of the same name within the JAR file. Essentially what I want to do is (something like) this: ClassLoader imagesURL = this.getClass().getClassLoader(); MediaTracker tracker = new MediaTracker(this); Enumeration<URL> images = imagesURL.getResources("resources/images/image*.gif"); while (images.hasMoreElements()){ tracker.add(getImage(images.nextElement(), i); i++; } I know I'm probably missing some obvious function, but I've spent hours searching through tutorials and documentation for a simple way to do this within an unsigned applet.

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• blackberry phonegape with eclipse configuration

  - by kailash

  I have been trying to run my simple hello world project in blacberry. While installing the package from "BlackBerry Update Site - http://www.blackberry.com/go/eclipseUpdate/3.6/web" i got following issues. Some sites could not be found. See the error log for more detail. No repository found at download.eclipse.org/rt/rap/1.3/runtime. No repository found at download.eclipse.org/modeling/emft/eef/updates/0.7.1/. No repository found at download.eclipse.org/stp/updates/. Unable to read repository at file:/C:/Eclipse1/p2/org.eclipse.equinox.p2.repository No repository found at download.eclipse.org/modeling/mdt/papyrus/updates/releases/. HTTP Server 'Internal Error': dev.eclipse.org/svnroot/dsdp/org.eclipse.tm.tcf Till i download this and install this, i will not be able to do anything. I am using Eclipse 2.0 Blackberry sdk 7.0 Please help me

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• Popup extender "frozen" on code-behind exception.

  - by davandries

  Hi, In a C#/ASP.NET project, we're using an ajax modalpopupextender to display a "Processing..." message to the users. We're displaying it using a Javascript call in the code of the ASP.NET page. Then, in the code behind, we're doing some database operation, and hide again the popup using "popup.hide();" The problem is that when an exception occurs in the code behind, the popup is still displayed and the application does not handle errors as per the "customErrors" tag of the web.config. Any idea on how to deal with this kind of issues? Thanks, David

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• iOS4.2: TouchBegan does not draw more then one circle per sensed touch

  - by Christian

  Hi all, quick question (which might be a no-brainer for most here) :) My code below should draw a circle for every time touch that is recognised but although more than ones touches are sensed only one circle will drawn up at a time. Can anyone see any obvious issues? This method sits in the XYZViewControler.m class. TouchPoint.m is the class that defines the circle. Thanks a bundle for your help and redirects. Chris - (void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *)event { NSSet * allTouches = [event allTouches]; // get all events for (UITouch * touch in touches) { TouchPoint * touchPoint = [[TouchPoint alloc] initWithFrame:CGRectMake(0, 0, circleWidth, circleWidth)]; touchPoint.center = [touch locationInView:[self view]]; touchPoint.color = [UIColor redColor]; touchPoint.backgroundColor = [UIColor whiteColor]; [[self view] addSubview: touchPoint]; [touchPoint release]; CFDictionarySetValue(touchMap, touch , touchPoint); } [[self view] setNeedsDisplay]; }

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• Attaching events in JavaScript

  - by R0MANARMY

  As comment to one of the questions here a commenter wrote (emphasis mine): ... By using an inline "onclick" you are doing a similar thing, but it is harder to maintain and more prone to issues. The JavaScript community as a whole has been moving away from inline JavaScript for a while now. This was referring to attaching events to HTML elements using $("#someID").click(function(){ do something here...; }); rather than <a id="someID" onclick="someFunction();"> Has there really been a shift away from the old school way of declaring events inline, and if so, what are the benefits of one of the other?

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• Trying to make E-commerce android application like E-bay

  - by kaibuki

  Hi All!! I am newbie to android development, and I have got assignment, of creating an android based shopping application something like bestbuy or ebay. so far the challenges I see in it are : 1) how to connect to SQL Server and get the data from there and show it on device. 2) how to do the ordering and other transactions kind of stuff. 3) really is it possible to make such application, as I am alone working on this assignment. looking forward for help from you guys and also any issues which might pop up while developing such application. Thanks regards KAI

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• SQLite multi process access

  - by Nicolas

  Hello, We are using SQLite in a multi processes and multi threaded application. The SQLite database files are encrypted using the embedded SQLite encryption. The FAQ states that SQLite should be able to manage multi process accesses using locks mechanism. We are experiencing a strange problem: When many threads are accessing the same database file, sometime constrains violations occur, more specifically - a field with a unique constrain is getting duplicate values after calling "insert or replace" statement. It happens quite often now, that we are using the encryption. Before we started using SQLite encryption we did not notice such a behavior. Are there any specific known issues with this?

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• What HTTP redirect status should I use to link offsite?

  - by Matthew Scharley

  While randomly browsing my website via Google, I noticed that it was showing up remote redirects as local files. Now this can be both good and bad, but I'm wondering how can I fix this so it doesn't happen? I'm currently using PHP and header('Location: ... which sends a 302 redirect. Looking over the list of HTTP status codes, I'd take a guess that I should be using 303 redirects to redirect offsite. Is anyone able to help me here, and either confirm/deny this, or tell me what I should be doing instead? Obviously, due to me not being able to tell Google to reindex my site on command, there's issues with being able to test this myself...

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• application authentication design ideas

  - by Berryl

  Hello I am working with on an app that uses wpf / silverlight on the front end and nhibernate on the back end, and looking for some design ideas to address authentication; I was looking at Rhino Security which I think is pretty slick and certainly useful, but doesn't in and of itself seem to address authentication. That said, I am looking for something of a technology agnostic overview of authentication design issues at this point. Does anyone have any links and / or experiences with an authentication design that is relatively easy to adapt to different common technologies. Cheers, Berryl

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• ASP.NET Dates Deployment Issue

  - by Jonathan Stowell

  Hi guys, I recently bought some webspace with dailyrazor.com. I have deployed an application I have been working on to the server and am currently trying to workout the bugs but I can't seem to solve this one. I have set up my database in Visual Studio to use the one I have create with dailyrazor the same db the deployed version will use. I am using British Dates and on my localhost datetime is displayed: 27/05/2010 09:00 However on the dailyrazor host it is displayed: 5/27/2010 9:00 AM Short Dates e.g. 27/04/2010 display the same on both servers. This is causing some issues when entering data as errors occur on date fields. Any help would be appreciated. Thanks, Jon

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• django templating system inheritance issue

  - by Suhail

  hi, i am having issues with my django templating system, i have a base.html file, which contains the content which will be common on all the web pages of the web site, the base.html file fetches some dynamic content, like the categories and the archives, which are passed to it by a python file, which fetches the categories and the archives data from a mysql database. the issue when i inherit this base.html file in other html files like index.html: {% extends "base.html" %} and when when i call the main index URL for ex: http://mywebsite.com/index/ the index page gets loaded, but the categories and the archives data that should get loaded from the base.html file does not. what am i doing wrong, please help.

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• DSACryptoServiceProvider constructor throws CryptographicException

  - by Rick

  This code below thows the following error: System.Security.Cryptography.CryptographicException "The handle is invalid" CspParameters CSPParam = new System.Security.Cryptography.CspParameters(13, null, null); CSPParam.Flags = CspProviderFlags.UseMachineKeyStore; CSPParam.KeyContainerName = "MyKeys"; System.Security.Cryptography.DSACryptoServiceProvider r = new System.Security.Cryptography.DSACryptoServiceProvider(CSPParam); //Error occurs here This code had been working with no issues then it started throwing this error. I can't think of anything that I have changed that relates to this. Has nayone seen this error? Any ideas of what to try?

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• Building elf within Eclipse within Windows

  - by BSchlinker

  Hey guys, I'm having trouble building an Elf file within Eclipse within Windows. It seems that everytime I build, a PE / portable executable for windows is created. I've gone into the Binary Parser section and checked Elf Parser while making sure that everything else is unchecked. However, I continue to end up with a PE which I cannot run on Linux. For clarification, I'm using the Linux GCC toolchain within Eclipse. I've attempted a reinstall of Cygwin -- still experiencing the same issues. Any ideas? Thanks

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• .NET Decimal = what in SQL?

  - by dmose

  What's the best data type in SQL to represent Decimal in .NET? We want to store decimal numbers with up to 9 decimal place precision and want to avoid rounding errors etc on the front end. Reading about data types, it appears using Decimal in .NET is the best option because you will not get rounding errors, although it is a bit slower than a Double. We want to carry this through down to the DB and want minimum conversion issues when moving data through the layers. Any suggestions?

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