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• Metalanguage like BNF or XML-Schema to validate a tree-instance against a tree-model

  - by Stefan

  Hi! I'm implementing a new machine learning algorithm in Java that extracts a prototype datastructure from a set of structured datasets (tree-structure). As im developing a generic library for that purpose, i kept my design independent from concrete data-representations like XML. My problem now is that I need a way to define a data model, which is basically a ruleset describing valid trees, against which a set of trees is being matched. I thought of using BNF or a similar dialect. Basically I need a way to iterate through the space of all valid TreeNodes defined by the ModelTree (Like a search through the search space for algorithms like A*) so that i can compare my set of concrete trees with the model. I know that I'll have to deal with infinite spaces there but first things first. I know, it's rather tricky (and my sentences are pretty bumpy) but I would appreciate any clues. Thanks in advance, Stefan

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• HTTP Headers for Unknown Content-Length

  - by jocull

  I am currently trying to stream content out to the web after a trans-coding process. This usually works fine by writing binary out to my web stream, but some browsers (specifically IE7, IE8) do not like not having the Content-Length defined in the HTTP header. I believe that "valid" headers are supposed to have this set. What is the proper way to stream content to the web when you have an unknown Content-Length? The trans-coding process can take awhile, so I want to start streaming it out as it completes.

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• C# - closures over class fields inside an initializer?

  - by Richard Berg

  Consider the following code: using System; namespace ConsoleApplication2 { class Program { static void Main(string[] args) { var square = new Square(4); Console.WriteLine(square.Calculate()); } } class MathOp { protected MathOp(Func<int> calc) { _calc = calc; } public int Calculate() { return _calc(); } private Func<int> _calc; } class Square : MathOp { public Square(int operand) : base(() => _operand * _operand) // runtime exception { _operand = operand; } private int _operand; } } (ignore the class design; I'm not actually writing a calculator! this code merely represents a minimal repro for a much bigger problem that took awhile to narrow down) I would expect it to either: print "16", OR throw a compile time error if closing over a member field is not allowed in this scenario Instead I get a nonsensical exception thrown at the indicated line. On the 3.0 CLR it's a NullReferenceException; on the Silverlight CLR it's the infamous Operation could destabilize the runtime.

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• cannot declare instance members in a static class in C#

  - by acadia

  Hello, I have a Public Static Class and I am trying to access appsettings from my app.config file in C# and I get the above error public static class employee { NameValueCollection appSetting = ConfigurationManager.AppSettings; } How do I get this to work? PS: I pasted just a few lines of code. thanks

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• How to set access-control-allow-origin in webrick under rails?

  - by brad

  I have written a small rails app to serve up content to another site via xmlhttprequests that will be operating from another domain (it will not be possible to get them running on the same server). I understand I will need to set access-control-allow-origin on my rails server to allow the requesting web page to access this material. It seems fairly well documented how to do this with Apache and this is probably the server I will use once I deploy the site. While I am developing though I hope to just use webrick as I am used to doing with rails. Is there a way of configuring webrick to provide the appropriate http header within rails?

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• django-admin formfield_for_* change default value per/depending on instance

  - by Nick Ma.

  Hi, I'm trying to change the default value of a foreignkey-formfield to set a Value of an other model depending on the logged in user. But I'm racking my brain on it... This: Changing ForeignKey’s defaults in admin site would an option to change the empty_label, but I need the default_value. #Now I tried the following without errors but it didn't had the desired effect: class EmployeeAdmin(admin.ModelAdmin): ... def formfield_for_foreignkey(self, db_field, request=None, **kwargs): formfields= super(EmployeeAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs) if request.user.is_superuser: return formfields if db_field.name == "company": #This is the RELEVANT LINE kwargs["initial"] = request.user.default_company return db_field.formfield(**kwargs) admin.site.register(Employee, EmployeeAdmin) ################################################################## # REMAINING Setups if someone would like to know it but i think # irrelevant concerning the problem ################################################################## from django.contrib.auth.models import User, UserManager class CompanyUser(User): ... objects = UserManager() company = models.ManyToManyField(Company) default_company= models.ForeignKey(Company, related_name='default_company') #I registered the CompanyUser instead of the standard User, # thats all up and working ... class Employee(models.Model): company = models.ForeignKey(Company) ... Hint: kwargs["default"] ... doesn't exist. Thanks in advance, Nick

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• Forcing fputcsv to Use Enclosure For *all* Fields

  - by Alan Storm

  When I use fputcsv to write out a line to an open file handle, PHP will add an enclosing character to any column that it believes needs it, but will leave other columns without the enclosures. For example, you might end up with a line like this 11,"Bob ",Jenkins,"200 main st. USA ",etc Short of appending a bogus space to the end of every field, is there any way to force fputcsv to always enclose columns with the enclosure (defaults to a ") character?

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• django admin - adding fields on the fly

  - by Thomas

  Basically I am writing a simple shopping cart. Each item can have multiple prices. (i.e. shirts where each size is priced differently). I would like to have a single price field in my admin panel, where when the first price is entered, an additional price field pops up. However I am kind of at a loss as to how to do this. What would be the best way to do this?

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• Tokenizing a string with unequal number of spaces between fields

  - by gatechgrad

  I am tryint to tokenize entries from a file. However I am not able to use the line.split("") option because of unequal number of spaces between files. I am copying a few lines from my file below: "08-09-2010 21:21:46 00:22:7f:a6:9b:69 -79" "08-09-2010 21:21:46 04:4f:aa:b4:49:49 -79" "08-09-2010 21:21:46 04:4f:aa:31:4e:59 tikona 18002090044 -83" "08-09-2010 21:21:46 00:22:7f:26:9b:69 tikona 18002090044 -74" "08-09-2010 21:21:46 04:4f:aa:34:0d:c9 tikona 18002090044 -82" "08-09-2010 21:21:46 04:4f:aa:71:4e:59 -85" "08-09-2010 21:21:46 04:4f:aa:34:21:89 tikona 18002090044 -75" "08-09-2010 21:21:46 04:4f:aa:34:49:49 tikona 18002090044 -77" "08-09-2010 21:21:46 04:4f:aa:74:0d:c9 -85" "08-09-2010 21:22:47 18 APs were seen " I need to access the first column (which is a datetime object) the second column (00:22...) and the last column (-79 etc.). I have no trouble accessing the first and second columns, but not the last column. When I do a info=line.spilt(""), since the third column might or might no entries, I am not able to determine the token number. How do i access the 4th column? Is there a way i can use info[i].contains(" -")?

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• Unresponsive form instance when instantiating form gets minimized

  - by sjlewis

  There's form A is the main form that gets hidden and is accessible via NotifyIcon's context menu. Form A instantiates form B via NotifyIcon's context menu also. Form B reacts to mouse events, etc. No problem there. Form B instantiates form C. Form C reacts to mouse events, etc. No problem here as well, but when form B gets minimized, form C no longer reacts to mouse events (eg. can no longer move, button clicks do not respond). Any idea why form C behaves like this in relation to form B getting minimized. I also tried to instantiate form C through form A (eg. form B calling a method in form A to instantiate form C) but the same thing happens. Is there any way to make form C respond even w/ form B (initiator) minimized?

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• Pylons, SQlite and autoincrementing fields

  - by Maxfrank

  Hey! Just started working with Pylons in conjunction with SQLAlchemy, and my model looks something like this: from sqlalchemy import Column from sqlalchemy.types import Integer, String from helloworld.model.meta import Base class Person(Base): __tablename__ = "person" id = Column(Integer, primary_key=True) name = Column(String(100)) email = Column(String(100)) def __init__(self, name='', email=''): self.name = name self.email = email def __repr__(self): return "<Person('%s')" % self.name To avoid sqlite reusing id's that might have been deleted, I want to add AUTOINCREMENT to the column "id". I've looked through the documentation for sqlalchemy and saw that the sqlite_autoincrement can be issued. An example where this attribute is given can be found here. sqlite_autoincrement seems though to be issued when creating the table itself, and I just wondered how it can be supplied when using a declarative style of the model such as mine.

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• Dynamic fields with Thinking Sphinx

  - by Ola Karlsson

  Hi! I'm building an application where I have products and categories. Category has_many properties and each property has a list of possible values. After a category is set to the product all properties show up in the form and the user can set that property to one of the properties possible values. My question is: Is it possible for Thinking Sphinx to filter the products through a property and property value ex: :with => {:property_id => property_value} If it's possible, what is the best way to implement this? If not is there any other library out there to solve this problem? Thanks / Ola

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• Specifying culture for http request/reponse

  - by Akash

  I have a ReSTful web service which needs to parse culture-sensitive data from the request. This data could either be in an XML body or part of the query string. Is there any acepted way of determining which culture the data is being sent in (and by extension the culture in which the response should be sent)? One option is simply to specify to the clients the culture in which all requests should be sent. A friendlier option seems to be to allow the client to specify the culture. I've considered: a) using the accept-language http header to encode this information. b) using the xml:lang attribute for XML POSTs, and an extra field for query strings (e.g. ...&culture=en-GB) http://www.w3.org/International/questions/qa-accept-lang-locales warns of limitations in using the accept-language header, but most of the warnings seem to center around requests originating from browsers. In my case the requests will come from other applications. All advice greatly appreciated!

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• MS Dynamics CRM 4.0 - onChange event error

  - by Brett

  Hi I have an onChange event that keeps bringing up the error below whenever I preview it. 'Object doesnt support this property or method' I have the onChange event associated with a picklist and when a specific option is selected another field is unhidden. The code is below: onLoad: //If How did you hear about us is set to event show the Source Event lookup crmForm.SourceEvent = function SourceEvent() { if (crmForm.all.gcs_howdidyouhearaboutus.DataValue == 5) { crmForm.all.gcs_sourceeventid_c.style.display = '' ; crmForm.all.gcs_sourceeventid_d.style.display = '' ; } else { crmForm.all.gcs_sourceeventid_c.style.display = 'none' ; crmForm.all.gcs_sourceeventid_d.style.display = 'none' ; } } crmForm.SourceEvent() ; onChange crmForm.SourceEvent() ; Would be great if someone could let me know why this error is showing up? Also, this has happened on a few onChange events on the form preview but once published onto the live system it does not error. Any ideas? Thank you Brett

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• PHP mySQL count number of fields not empty

  - by Pez Cuckow

  I have a database of users where they can send messages to other users (up to four) and the ID of the message they sent is in their user row. e.g. Name, Email, Msg1, Msg2, Msg3, Msg4 Pez, [email protected], 1, 55, 42, 5 //Send 4 messages Steve, [email protected], 0, 0, 0, 0 //Send 0 messages Leon, [email protected], 3, 0, 3, 5 //Send 3 messages How in a MySQL query can I get the amount of those message rows that are not empty or not equal to 0, allowing me to order by that? So it would return Pez - 4 Mesasges Leon - 3 Messages Steve - 0 Messages Im my mind something like order by count(!empty(msg1)+!empty(msg2)+!empty(msg3)+!empty(msg4)) Many thanks,

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• Changing the Messages for required Fields in IntraWeb

  - by andiw

  When setting the Required property of a IntraWeb control I get a nice little message box saying "Bezeichnung is a required field" if I leave it blank. How can I change the Text of those messages? (My application is in german language)

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• Django ModelForm for Many-to-Many fields

  - by theycallmemorty

  Consider the following models and form: class Pizza(models.Model): name = models.CharField(max_length=50) class Topping(models.Model): name = models.CharField(max_length=50) ison = models.ManyToManyField(Pizza, blank=True) class ToppingForm(forms.ModelForm): class Meta: model = Topping When you view the ToppingForm it lets you choose what pizzas the toppings go on and everything is just dandy. My questions is: How do I define a ModelForm for Pizza that lets me take advantage of the Many-to-Many relationship between Pizza and Topping and lets me choose what Toppings go on the Pizza?

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• To static or not to static

  - by Idsa

  I really like to use static methods (especially for helpers classes). But as static methods are not stubbable, eventually they are a bad practice, aren't they? So I have to choose between static methods usage convenience and testability. Is there any compromise?

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• Get HTTP header fields only on iPhone

  - by amit

  I want to get only the headers of an URL request. I have been using stringWithContentsOfURL() for all downloading so far, but now I am only interested in the headers and downloading the entire file is not feasible as it is too large. I have found solutions which show how to read the headers after the response has been receieved, but how do I specify in the request that I only wish to download headers. Skip the body! Thanks.

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• Charset and POST request

  - by jriff

  Hi All! I have a Rails 2.3.5 application that is working fine with UTF-8 and international characters. Now I have made some integration to a payment gateway where I POST some data, wait a while and get a POST back. The problem is that when I get that post back the international characters are broken. Instead of "sørensen" I get: "sørensen". If I do an iconv -fISO-8859-1 -tUTF8 it gets correctly converted to the former (I do that from a OS X command prompt). I have examined the POST request with logger.info(request.headers.inspect) in my controller and I can see that no charset parameter is given. As far as I can see the POST from the gateway must be UTF8 since one character (ø) gets translated to two (ø). So why does Rails think that the POST is ISO-8859-1? I know that one solution is to simply convert the params-hash with Iconv in the controller but I would like to know what is happening. Thanks in advance. Regards, Jacob

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• How to setup CF9 with IIS7 (multiple instance, virtual hosting by hostname)

  - by Henry

  I'm used to setting up CF9 (Dev edition) on my Windows using Apache. I would like to try using IIS7 that comes with Win7 Pro. What are the steps to set it up so that I can have: www.siteA.dev www.siteB.dev Both of these point to 127.0.0.1 via windows host file. I would like siteA.dev & siteB.dev to use 2 different CF instances. I already installed CF9 dev edition with 2nd option. What should I do next? Do I need to use IIS manager? Or the CF's Web Server Config tool is all I need? Where to enter the data to IIS like vhost in Apache? Thank you

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• Servlet Filters and the OSGi HttpService

  - by wrumsby

  I'm working on an OSGi-based application that uses org.osgi.service.http.HttpService which does not support the use of Servlet Filters. Before I realised that I wouldn't be able to use Servlet Filters I was planning to apply a couple of existing Filters. These Filters set the appropriate HTTP headers to: prevent caching of responses control rendering in IE8 with the X-UA-Compatible header What are my options here? I don't want to use meta elements to control caching since that technique is unreliable. Using a meta element to set the X-UA-Compatible header is probably acceptable, but I'd still be interested in alternative approaches.

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• How to remove date header from apache ?

  - by Dario

  hi everyone, I need to minimize Apache HTTP response headers, by now i reduced them as following HTTP/1.1 200 OK Date: Thu, 25 Mar 2010 21:57:41 GMT Server: Apache Content-Type: text/html I'd like to know if there is a way to disable Date and Server header, only for a certain virtual host. Thank you!

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• Update a field thanks to a subquery based on another field

  - by Nicolas

  Hi, I use a MySQL DB, and I would like to update a filed in a table based on another. Something like: UPDATE table1 SET field1 = table2.id WHERE field2 IN ( SELECT table2.name FROM table2 ); I know that this query wouldn't work, but here is the idea. Is that even possible to do? Cheers, Nicolas.

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• [NSCFNumber _isNaturallyRTL]: unrecognized selector sent to instance 0x605ac10

  - by Risma

  my app got crashed an showed that keyword. There is no error and warning. can some body help me?? this is stack that showed : Call stack at first throw: ( 0 CoreFoundation 0x012ccbe9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x014215c2 objc_exception_throw + 47 2 CoreFoundation 0x012ce6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x0123e366 ___forwarding___ + 966 4 CoreFoundation 0x0123df22 _CF_forwarding_prep_0 + 50 5 UIKit 0x0042d35e -[UITextField setText:] + 53 6 Koder232_risma_edited 0x0006427a -[FilePropertiesViewController viewWillAppear:] + 442 7 UIKit 0x003c4d52 -[UIView(Hierarchy) _willMoveToWindow:withAncestorView:] + 207 8 UIKit 0x003cfa2b -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 378 9 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427 10 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427 11 UIKit 0x003c6b36 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 370 12 UIKit 0x003c514f -[UIView(Hierarchy) addSubview:] + 57 13 UIKit 0x006ad8ae -[UIPopoverView presentFromRect:inView:contentSize:backgroundStyle:animated:] + 1920 14 UIKit 0x006a0a4c -[UIPopoverView presentFromRect:inView:animated:] + 236 15 UIKit 0x006d9b20 -[UIPopoverController presentPopoverFromRect:inView:permittedArrowDirections:animated:] + 1046 16 Koder232_risma_edited 0x0001f90f -[codeViewController arrangeTabWithTypeGesture:andNumtag:] + 4683 17 Koder232_risma_edited 0x0001e68f -[codeViewController setTap2:] + 99 18 UIKit 0x0061e9c7 -[UIGestureRecognizer _updateGestureWithEvent:] + 727 19 UIKit 0x0061a9d6 -[UIGestureRecognizer _delayedUpdateGesture] + 47 20 UIKit 0x00620fa5 _UIGestureRecognizerUpdateObserver + 584 21 UIKit 0x0062118a _UIGestureRecognizerUpdateGesturesFromSendEvent + 51 22 UIKit 0x003bc6b4 -[UIWindow _sendGesturesForEvent:] + 1292 23 UIKit 0x003b7f87 -[UIWindow sendEvent:] + 105 24 UIKit 0x0039b37a -[UIApplication sendEvent:] + 447 25 UIKit 0x003a0732 _UIApplicationHandleEvent + 7576 26 GraphicsServices 0x0191fa36 PurpleEventCallback + 1550 27 CoreFoundation 0x012ae064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 28 CoreFoundation 0x0120e6f7 __CFRunLoopDoSource1 + 215 29 CoreFoundation 0x0120b983 __CFRunLoopRun + 979 30 CoreFoundation 0x0120b240 CFRunLoopRunSpecific + 208 31 CoreFoundation 0x0120b161 CFRunLoopRunInMode + 97 32 GraphicsServices 0x0191e268 GSEventRunModal + 217 33 GraphicsServices 0x0191e32d GSEventRun + 115 34 UIKit 0x003a442e UIApplicationMain + 1160 35 Koder232_risma_edited 0x00002680 main + 102 36 Koder232_risma_edited 0x00002611 start + 53 37 ??? 0x00000001 0x0 + 1 )

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