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• Is the valid state domain of a program a regular language?

  - by BCS

  If you look at the call stack of a program and treat each return pointer as a token, what kind of automata is needed to build a recognizer for the valid states of the program? As a corollary, what kind of automata is needed to build a recognizer for a specific bug state? My thought is that if these form regular languages than some interesting tools could be built around that. E.g. given a set of crash/failure dumps, automatically group them and generate a recognizer to identify new instances of know bugs.

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• Global "ajax call" notification with asp.net mvc/jquery

  - by Joel Martinez

  I need to be notified any time a largeish asp.net mvc web application makes an ajax call to the server. We're using both jquery, and the built-in Ajax.* methods to do the remote calls, and I would like a global way of knowing when we make a call without having to manually inject some sort of "IsMakingCall" method to every request. The root problem we're trying to solve is session timeout. If the user leaves a page up and goes to lunch (for example), they get errors when they get back because the ajax call is returning the login page instead of the expected json or partial html result. My idea was to have a js timer which would be reset any time we make an ajax call. That way, if the timer runs out (ie. their session has now timed out) I can just auto-log them out. This is how sites like bank of america and mint.com work. Thanks!

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• Using GridSplitter in a Xaml file for both Silverlight and WPF

  - by Daniel Plaisted

  I have a Xaml file which is used in a project which can be built for both Silverlight and WPF. I want to use the GridSplitter control. However, this control is in different Xaml namespaces on Silverlight and desktop WPF. In WPF, the namespace is: http://schemas.microsoft.com/winfx/2006/xaml/presentation On Silverlight, it is: http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk So if the xaml code is <GridSplitter/>, it will work on WPF but not Silverlight, and if the code is <sdk:GridSplitter/>, it will work on Silverlight but not WPF. Is there a way to write this so that it works on both platforms?

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• Library to parse ERB files

  - by Douglas Sellers

  I am attempting to parse, not evaluate, rails ERB files in a Hpricot/Nokogiri type manner. The files I am attempting to parse contain HTML fragments intermixed with dynamic content generated using ERB (standard rails view files) I am looking for a library that will not only parse the surrounding content, much the way that Hpricot or Nokogiri will but will also treat the ERB symbols, <%, <%= etc, as though they were html/xml tags. Ideally I would get back a DOM like structure where the <%, <%= etc symbols would be included as their own node types. I know that it is possible to hack something together using regular expressions but I was looking for something a bit more reliable as I am developing a tool that I need to run on a very large view code base where both the html content and the erb content are important. For example, content such as: blah blah blah <divMy Great Text <%= my_dynamic_expression %</div Would return a tree structure like: root - text_node (blah blah blah) - element (div) - text_node (My Great Text ) - erb_node (<%=)

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• Visual Studio 2008 - The breakpoint cannot be hit

  - by Josh

  I know that many people have had this problem... but I am now having it and cannot solve the issue. VS 2008 is randomly giving me an error after working on a project for weeks. When I set a debug point, I get a warning: The breakpoint will not currently be hit. No symbols have been loaded for this document. I have re-built the solution with no debug points and re-tried. I have also tried to Load Symbols from path and that has not worked either... Can someone please help walk me through the necessary steps to getting my debug function working again. Thanks.

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• Universal iPhone/iPad application debug compilation error for iPhone testing

  - by andybee

  I have written an iPhone and iPad universal app which runs fine in the iPad simulator on Xcode, but I would now like to test the iPhone functionality. I seem unable to run the iPhone simulator with this code as it always defaults to the iPad? Instead I tried to run on the device and as it begins to run I get the following error: dyld: Symbol not found: _OBJC_CLASS_$_UISplitViewController Referenced from: /var/mobile/Applications/9770ACFA-0B88-41D4-AF56-77B66B324640/Test.app/Test Expected in: /System/Library/Frameworks/UIKit.framework/UIKit in /var/mobile/Applications/9770ACFA-0B88-41D4-AF56-77B66B324640/Test.app/TEST As the App is built programmatically rather than using XIB's, I've split the 2 device logics using the following lines in the main.m method: if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { retVal = UIApplicationMain(argc, argv, nil, @"AppDelegate_Pad"); } else { retVal = UIApplicationMain(argc, argv, nil, @"AppDelegate_Phone"); } From that point forth they use different AppDelegates and I've checked my headers to ensure the UISplitView is never used nor imported via the Phone logic. How do I avoid this error and is there a better way to split the universal logic paths in this programmatically-created app?

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• Large file upload into WSS v3

  - by Rubens Farias

  I'd built an WSSv3 application which upload files in small chunks; when every data piece arrives, I temporarly keep it into a SQL 2005 image data type field for performance reasons**. Problem come when upload ends; I need to move data from my SQL Server to Sharepoint Document Library through WSSv3 object model. Right now, I can think two approaches: SPFileCollection.Add(string, (byte[])reader[0]); // OutOfMemoryException and SPFile file = folder.Files.Add("filename", new byte[]{ }); using(Stream stream = file.OpenBinaryStream()) { // ... init vars and stuff ... while ((bytes = reader.GetBytes(0, offset, buffer, 0, BUFFER_SIZE)) 0) { stream.Write(buffer, 0, (int)bytes); // Timeout issues } file.SaveBinary(stream); } Are there any other way to complete successfully this task? ** Performance reasons: if you tries to write every chunk directly at Sharepoint, you'll note a performance degradation as file grows up (100Mb).

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• What are the Build Settings for a Universal iPhone and iPad Application

  - by McPragma

  What would be the settings to build and have accepted an universal app for both the iPad and iPhone? That is, what would be the settings in Project X Info Build for Architectures [ARCHS] ("Standard(armv6)" or "Optimized(armv6 armv7)" or other) Valid Architectures [VALID_ARCHS] ("armv6 armv7" or other) Build Active Architecture Only (checked or unchecked) and what would we select in the dropdown (Device - 3.2|Distribution|armv?) ? We're either getting warnings at build time that we haven't built for armv7, or the app upload is rejected on account of "The binary you uploaded was invalid. When supporting iPhone, the executable must include support for the armv6 architecture". Thank you for your help.

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• Should I use WPF or ASP.NET for my next Web Application development?

  - by gap

  We have a web application that has been built using MySQL / PHP / Javascript+JQuery, with server-side HTML generation. The problem is that of the 10 software developers that work for the company, none are PHP experts (we're all .NET / C# developers). I need to make a recommendation to my management team on which technologies to use as the platform for the next generation of web application products. I want to leverage the .NET / C# expertise which the company has and is otherwise building, and so am inclined to recommend some Microsoft technologies. We don't want a client-side plugin, and we don't need flashy animations/multimedia, so I'm ruling out Silverlight. Is WPF ready for primetime? Is ASP.NET deprecated by WPF? How do I choose between these two technologies? Big Question, I know... I can refine it based on your comments if necessary. Thanks for taking the time.

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• operator not defined for System.Data.SqlClient.SqlConnection and System.Data.SqlClient.SqlConnection

  - by Beta033

  i hope i'm just doing something wrong here. Ideally i'm trying to open the connection, open a transaction execute a ton of prebuilt sqlstatements (with parameters) against this connection then close the connection. ideally all in the same batch. It's easy enough to wrap this all in a for loop, however i'd like to use the forEach function of the list generic to set the connection as it'll probably be faster than my implementation of calling List.Item(i) in the loop but i get some strange errors. Dim sqlStatements As List(Of SqlCommand) = New List(Of SqlCommand) Dim conn As SqlClient.SqlConnection = New SqlConnection("...") sqlStatements.Item(0).Connection = conn 'Works sqlStatements.ForEach(Function(ByRef cmd As SqlCommand) cmd.Connection = conn) 'ERROR: Operator '=' is not defined for types 'System.Data.SqlClient.SqlConnection' 'and 'System.Data.SqlClient.SqlConnection What does this error really mean?

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• Eclipse + PDT hides files extensions

  - by pzearfoss

  Eclipse is now hiding file extensions in PDT, in the PHP Explorer. They show up on tabs when the file is opened. This applies to files of all types. While annoying, it didn't become problematic until I started including the .htaccess files in the list. They now show up with no filename at all. I've scoured the prefs and the web looking for a resolution. Anyone had this happen or have an idea of how to fix it? Running Eclipse 3.5.2 PDT 2.1 on MacOS 10.5

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• Korn Shell code to send attachments with mailx and uuencode?

  - by Nano Taboada

  I need to attach a file with mailx but at the moment I'm not having a lot of success. Here's my code: subject="Something happened" to="[email protected]" body="Attachment Test" attachment=/path/to/somefile.csv uuencode $attachment | mailx -s "$subject" "$to" << EOF The message is ready to be sent with the following file or link attachments: somefile.csv Note: To protect against computer viruses, e-mail programs may prevent sending or receiving certain types of file attachments. Check your e-mail security settings to determine how attachments are handled. EOF Any feedback would be highly appreciated. Update I've added the attachment var to avoid having to use the path every time.

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• Installing a COM object without privileged access for use in Microsoft Office

  - by bmargulies

  Start with a series of MS Office extensions built in C++ as COM objects. Add a user who really badly wants to avoid the requirement of an installer with the necessary privileges to write to HKEY_CLASSES_ROOT. I've seem bits of evidence that MS has created some sort of trick for shadowing HKEY_CLASSES_ROOT from HKCU. Is this, in fact, possible? If so, can this be installed as a non-privileged MSI, or does it have to be arranged otherwise? And, finally, what's the minimum version of Windows required?

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• Unicode issue in Django

  - by Kave

  I seem to have a unicode problem with the deal_instance_name in the Deal model. It says: coercing to Unicode: need string or buffer, __proxy__ found The exception happens on this line: return smart_unicode(self.deal_type.deal_name) + _(u' - Set No.') + str(self.set) The line works if I remove smart_unicode(self.deal_type.deal_name) but why? Back then in Django 1.1 someone had the same problem on Stackoverflow I have tried both the unicode() as well as the new smart_unicode() without any joy. What could I be missing please? class Deal(models.Model): def __init__(self, *args, **kwargs): super(Deal, self).__init__(*args, **kwargs) self.deal_instance_name = self.__unicode__() deal_type = models.ForeignKey(DealType) deal_instance_name = models.CharField(_(u'Deal Name'), max_length=100) set = models.IntegerField(_(u'Set Number')) def __unicode__(self): return smart_unicode(self.deal_type.deal_name) + _(u' - Set No.') + str(self.set) class Meta: verbose_name = _(u'Deal') verbose_name_plural = _(u'Deals') Dealtype: class DealType(models.Model): deal_name = models.CharField(_(u'Deal Name'), max_length=40) deal_description = models.TextField(_(u'Deal Description'), blank=True) def __unicode__(self): return smart_unicode(self.deal_name) class Meta: verbose_name = _(u'Deal Type') verbose_name_plural = _(u'Deal Types')

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• External XMPP component - Anyone know a Tutorial or Open Source Example please?

  - by gav

  Hi All, I want to run an XMPP server (Openfire) and register an external component to handle the messages it will recieve (using the Whack library). The external component will run my game logic and I will be using XMPP to send player moves to the server and status updates in the other direction. The bonus with XMPP is that we get built in chat for free. The trouble is, although Ignite look fairly established, I can't find a tutorial on how to write, register and debug an External XMPP component written with Whack, there are very few in general for that matter. I am not invested in either the server implementation or the External Component library, java is just my language of choice. If I was to move to Erlang or Scala or something it would have to be a very simple in that language. A single tutorial or example would go a long way here, I just need an basic External XMPP component pretty please! Kind regards, Gavin

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• Implementing IComparable<NotSelf>

  - by Luc Touraille

  This might be a trivial question, but I didn't find any information about this: is it "harmful" or considered bad practice to make a type T implement IComparable<S> (T and S being two different types)? Example: class Foo : IComparable<int> { public int CompareTo(int other) { if (other < i) return -1; if (other > i) return 1; return 0; } private int i; } Should this kind of code be avoided, and if yes, why?

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• Are document-oriented databases meant to replace relational databases?

  - by evolve

  Recently I've been working a little with MongoDB and I have to say I really like it. However it is a completely different type of database then I am used. I've noticed that it is most definitely better for certain types of data, however for heavily normalized databases it might not be the best choice. It appears to me however that it can completely take the place of just about any relational database you may have and in most cases perform better, which is mind boggling. This leads me to ask a few questions: Are document-oriented databases have been developed to be the next generation of databases and basically replace relational databases completely? Is it possible that projects would be better off using both a document-oriented database and a relational database side by side for various data which is better suited for one or the other? If document-oriented databases are not meant to replace relational databases, then does anyone have an example of a database structure which would absolutely be better off in a relational database (or vice-versa)?

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• java-COM interop: Implement COM interface in Java

  - by mdma

  How can I implement a vtable COM interface in java? In the old days, I'd use the Microsft JVM, which had built in java-COM interop. What's the equivalent for a modern JRE? Answers to a similar SO question proposed JACOB. I've looked at JACOB, but that is based on IDispatch, and is aimed at controlling Automation serers. The COM interfaces I need are custom vtable (extend IUnknown), e.g. IPersistStream, IOleWindow, IContextMenu etc. For my use case, I could implement all the COM specifics in JNI, and have the JNI layer call corresponding interfaces in java. But I'm hoping for a less painful solution. It's for an open source project, so open source alternatives are preferred.

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• VS2008 Setup Project for C# Project

  - by xopht

  I've built app using wmp.dll which is Windows System File in my XP machine. If I tried add outputs of above project to my Setup Project, VS warned that ''wmp.dll' should be excluded because its source file 'C:\WINDOWS\system32\wmp.dll' is under Windows System File Protection'. There're three things under 'Detected Dependencies' folder. Microsoft .NET Framework, Interop.WMPLib.dll and wmp.dll. The app works okay in my machine, of course. But if I install this into Windows Server 2003 machine, the app does not be launched. I think this is because different version of OS use different version of wmp.dll. Anyway, how can I fix this? ps. I've even excluded wmp.dll from the Setup Project.

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• What technical skills needed for algorithmic trading, HFT, etc?

  - by alchemical

  I'm interested in getting into developing trading systems, black box, HFT, etc. My primary experience is with C# and .Net (7 years). I've also done some sockets programming. I have some experience in finance working on analysis applications (2 years). My goal is to move into developing automated trading systems for a hedge fund, bank, etc. Is there any way to learn the skills needed for this without somehow getting the job first? I've looked at the open source tradelink, IB interactive brokerage, etc. I'm playing around with this framework, and may hook it up and do some paper trading. However, I'm not sure if this has much relationship with how a well-funded entity would be conducting a high-level automated trading operation. I.e. would the tools and frameworks they prefer be a totally different skill-set? Also wondering if I need to learn C++ and/or Java for these types of apps.

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• Does there exist a jQuery plugin or JavaScript library that allows Venn Diagram presentation?

  - by knowncitizen

  I'm writing a jQuery application to allow analysis of data with the help of visual cues. My data is retrieved via XMLHttpRequest in the form of JSON. The visual cues include histograms, spark lines, and various other graph types. The idea is that the user is able to narrow their data via these various visual views. My question is thus - aside from the Google Charts API, does there exist a JavaScript way of presenting a Venn Diagram? Requirement: no Flash. Canvas is acceptable.

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• Django Admin interface with pickled set

  - by Rosarch

  I have a model that has a pickled set of strings. (It has to be pickled, because Django has no built in set field, right?) class Foo(models.Model): __bar = models.TextField(default=lambda: cPickle.dumps(set()), primary_key=True) def get_bar(self): return cPickle.loads(str(self.__bar)) def set_bar(self, values): self.__bar = cPickle.dumps(values) bar = property(get_bar, set_bar) I would like the set to be editable in the admin interface. Obviously the user won't be working with the pickled string directly. Also, the interface would need a widget for adding/removing strings from a set. What is the best way to go about doing this? I'm not super familiar with Django's admin system. Do I need to build a custom admin widget or something? Update: If I do need a custom widget, this looks helpful: http://www.fictitiousnonsense.com/archives/22

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• Animation on the iPhone - use image sequence or rotation?

  - by user157733

  I am creating a basic animation for my iPhone app. I have a choice to make between 2 different types of animation. I can use this... NSArray *myImages = [NSArray arrayWithObjects: [UIImage imageNamed:@"myImage1.png"], [UIImage imageNamed:@"myImage2.png"], [UIImage imageNamed:@"myImage3.png"], [UIImage imageNamed:@"myImage4.gif"], nil]; UIImageView *myAnimatedView = [UIImageView alloc]; [myAnimatedView initWithFrame:[self bounds]]; myAnimatedView.animationImages = myImages; myAnimatedView.animationDuration = 0.25; [self addSubview:myAnimatedView]; [myAnimatedView release]; or something like this... [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:1.5]; // other animations goes here myImage.transform = CGAffineTransformMakeRotation(M_PI*0.5); // other animations goes here [UIView commitAnimations]; I have quite a few of these parts to animate so I want to choose an option which uses the least amount of memory and runds the quickest. Any advice would be great, thanks

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• InvalidCastException when creating an instance using assembly.CreateInstance

  - by Yossi Dahan

  I'm looking for an explanation for the following - I have an assembly I'm loading using Assembly assembly = Assembly.LoadFrom(filename); I then loop on all the types in the assembly, and wish to try and find out if a type implements a particular interface and if so I want an instance of that type, I've tried several things which did not work, but when I fell back to the most basic (and probably inefficient) way, I realised there's something more fundamental I don't understand - foreach (Type t in assembly.GetTypes()) { foreach (Type i in t.GetInterfaces()) { if (i.FullName == pluginInterfaceType.FullName) { object o = assembly.CreateInstance(t.ToString()); IInterface plugin = (IInterface)o; That last line causes an InvalidCastException, despite the fact that the type created definitely implements that interface. Further more - if I use Activator.CreateInstance instead of Assembly.CreateInstance (which I don't want to do), casting to the interface works just fine.

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• Best practices for fixed-width processing in .NET

  - by jmgant

  I'm working a .NET web service that will be processing a text file with a relatively long, multilevel record format. Each record in the file represents a different entity; the record contains multiple sub-types. (The same record format is currently being processed by a COBOL job, if that gives you a better picture of what we're looking at). I've created a class structure (a DATA DIVISION if you will) to hold the input data. My question is, what best practices have you found for processing large, complex fixed-width files in .NET? My general approach will be to read the entire line into a string and then parse the data from the string into the classes I've created. But I'm not sure whether I'll get better results working with the characters in the string as an array, or with the string itself. I guess that's the specific question, string vs. char[], but I would appreciate any other pointers anyone has. Thanks.

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