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  • Defining - and dealing with - Evil

    - by Chris Becke
    As a software developer one sometimes gets feature requests that seem to be in some kind of morally grey area. Sometimes one can deflect them, or implement them in a way that feels less 'evil' - sometimes - on reflection - while the feature request 'feels' wrong theres no identifiable part of it that actually causes harm. Sometimes one feels a feature is totally innocent but various anti virus products start tagging one as malware. For example - I personally consider EULAs to (a) hopefully be unenforceable and (b) a means by which rights are REMOVED from consumers. However Anti Virus scanners frequently mark as malware any kind of download agent that does not display a EULA. Which to me is the result of a curious kind of double think. What I want to know is - are there any online (or offline) resources that cover evil software development practices? How can I know if a software practice that I consider dodgy is in fact evil enough to consider fighting?

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  • how to get entire document in scrapy using hxs.select

    - by Chris Smith
    I've been at this for 12hrs and I'm hoping someone can give me a leg up. Here is my code all I want is to get the anchor and url of every link on a page as it crawls along. from scrapy.contrib.spiders import CrawlSpider, Rule from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor from scrapy.selector import HtmlXPathSelector from scrapy.utils.url import urljoin_rfc from scrapy.utils.response import get_base_url from urlparse import urljoin #from scrapy.item import Item from tutorial.items import DmozItem class HopitaloneSpider(CrawlSpider): name = 'dmoz' allowed_domains = ['domain.co.uk'] start_urls = [ 'http://www.domain.co.uk' ] rules = ( #Rule(SgmlLinkExtractor(allow='>example\.org', )), Rule(SgmlLinkExtractor(allow=('\w+$', )), callback='parse_item', follow=True), ) user_agent = 'Mozilla/5.0 (Windows; U; MSIE 9.0; WIndows NT 9.0; en-US))' def parse_item(self, response): #self.log('Hi, this is an item page! %s' % response.url) hxs = HtmlXPathSelector(response) #print response.url sites = hxs.select('//html') #item = DmozItem() items = [] for site in sites: item = DmozItem() item['title'] = site.select('a/text()').extract() item['link'] = site.select('a/@href').extract() items.append(item) return items What I'm doing wrong... my eyes hurt now.

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  • testing .mobile mime format with capybara / rspec

    - by Chris Beck
    For detecting and responding to mobile user agents, I'm using Mime::Type.register_alias "text/html", :mobile and the approach I'm wondering what is the best approach to test with capybara. This article suggests setting up an iphone driver with Capybara.register_driver :iphone do |app| http://blog.plataformatec.com.br/2011/03/configuring-user-agents-with-capybara-selenium-webdriver/ but I'd like a more flexible approach where the mime type is set via the url extension localhost/index.mobile and where I can do this visit user_path( format: :mobile) Rails understands the extension and sets the format in the params hash, but how do I get the url helper methods to add that to all urls as a file extension?

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  • jquery hover propagation

    - by Chris
    I'm using this on an hover image : $('.img-style').hover (function(e) { var prixPlus = $(this).closest('a').attr('data-prix'); prixPlus = parseFloat(prixPlus); var prixNew = prix + prixPlus; $('#chgePrix').html(prixNew.toFixed(2)); $('#txtapart').fadeTo('fast', 0.1); }, function(e) { $('#chgePrix').html(prix.toFixed(2)); $('#txtapart').fadeTo('fast', 1); }); But if I pass quickly the mouse 2 or more times over the image, $('#txtapart') fade in and out 2 or more times ! How can I stop the fade propagation ? Thanks for your help...

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  • WebSphere MQ Low Latency Messaging - Does it have a JMS (or JMS like) API?

    - by Chris Kimpton
    We are currently using IBM MQ via JMS, but seem to be pushing through more messages than it can handle - strangely, the problem seems to be intermittent. The messages are prices and thus dont need to be guaranteed, just need to be sent quickly. As IBM have a Low Latency product, I am wondering if that is perhaps the better solution - but it does not seem to have a JMS api, or at least not easily visible. Anyone know if there is a JMS api into the Low Latency product, or if the "unique" API it does have is JMS-like... Alternatively, pointers for MQ tuning would also be appreciated... :)

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  • How do I pass the currently logged in user's credentials to a web service using Integrated Windows A

    - by Chris Smith
    I am having a frustrating time trying to do something with Perl that would take a couple of lines of code in C#, namely to call a web service on a Windows server that requires Integrated Windows Authentication. The most likely candidate I've found for success is a module called LWP::Authen::Ntlm, but all the examples I've googled require you to explicitly supply username, password and domain. I don't want to do that - I just want the request to use the credentials of the currently logged in user, a la CredentialCache.DefaultCredentials in .NET. Have any of you Perl gurus out there ever had to do this? Thanks.

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  • Combine hash values in C#

    - by Chris
    I'm creating a generic object collection class and need to implement a Hash function. I can obviously (and easily!) get the hash values for each object but was looking for the 'correct' way to combine them to avoid any issues. Does just adding, xoring or any basic operation harm the quality of the hash or am I going to have to do something like getting the objects as bytes, combining them and then hashing that? Cheers in advance

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  • Django: How to dynamically add tag field to third party apps without touching app's source code

    - by Chris Lawlor
    Scenario: large project with many third party apps. Want to add tagging to those apps without having to modify the apps' source. My first thought was to first specify a list of models in settings.py (like ['appname.modelname',], and call django-tagging's register function on each of them. The register function adds a TagField and a custom manager to the specified model. The problem with that approach is that the function needs to run BEFORE the DB schema is generated. I tried running the register function directly in settings.py, but I need django.db.models.get_model to get the actual model reference from only a string, and I can't seem to import that from settings.py - no matter what I try I get an ImportError. The tagging.register function imports OK however. So I changed tactics and wrote a custom management command in an otherwise empty app. The problem there is that the only signal which hooks into syncdb is post_syncdb which is useless to me since it fires after the DB schema has been generated. The only other approach I can think of at the moment is to generate and run a 'south' like database schema migration. This seems more like a hack than a solution. This seems like it should be a pretty common need, but I haven't been able to find a clean solution. So my question is: Is it possible to dynamically add fields to a model BEFORE the schema is generated, but more specifically, is it possible to add tagging to a third party model without editing it's source. To clarify, I know it is possible to create and store Tags without having a TagField on the model, but there is a major flaw in that approach in that it is difficult to simultaneously create and tag a new model.

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  • Which Stroustrup book should I use?

    - by Chris Simmons
    I'm a C# programmer that is looking to branch out. I'm bored of writing business software and want to start getting into graphics programming and games/simulators. So I figured, although writing that stuff isn't impossible in managed code, the "right" way to do that would be to look to C++, of course focussing on the language first, then getting into OpenGL or DirectX (or whatever). Way way back ('98? '99?) I had tried and failed to really grasp Stroustrup's The C++ Programming Language. I know that this book is often not recommended for the beginner. Anyway, I picked it back up (in a much more recent printing) and I'm actually getting it and enjoying it. I also have a copy of his textbook, Programming: Principles and Practice Using C++, which, as I understand it, is really geared toward teaching programming, not necessarily C++. I'm certainly not arrogant enough to claim I don't have anything more to learn about programming, data structures, algoriths, etc., however I'm not a novice there either. So my question is, with the goal of gaining the broader and more real-world-useful understanding of C++ and given my background, on which should I focus? The denser (as I perceive it) TCPPPL or the gentler Programming? EDIT: I thank everyone for the responses. However, I've got a personal choice here to make between these two books. Granted there are other very good books out there, but I'm already a good length into both of the books I mention and I'd like to finish one. So, can anyone respond on which would be the better and why? Time is not an issue; I'm not looking (at this point) at an "accelerated" read.

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  • XPath - get parent node

    - by chris.shi
    //* [ local-name()='component' and namespace-uri()='urn:hl7-org:v3' ] using thispath ,I can get a node like this: <component xmlns="urn:hl7-org:v3"> <structuredBody> <component> <section> <code code="10164-2" codeSystem="2.16.840.1.113883.6.1" codeSystemName="LOINC"/> <title>History of Present Illness</title> <text> </text> </section> </component> <component> ...... </component> <component> ...... </component> <structuredBody/> <component/> in order to get the node as below: <component> <section> <code code="10164-2" codeSystem="2.16.840.1.113883.6.1" codeSystemName="LOINC"/> <title>History of Present Illness</title> <text> </text> </section> </component> I change the path to : //* [ local-name()='component' and namespace-uri()='urn:hl7-org:v3' and position()=1] but ,how can I get the same result by using [code="10164-2"] as a qualification. ( I do not know how to describe this question ,as a result ,the title of this question is a little simple ,sorry .) thanks

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  • How can I create a FreeBSD package using EPM that has the ORIGIN @comment?

    - by Chris R
    I'm building packages of our internal software products using EPM, and over time these packages (of which we have a large number) clutter up the output of pkg_delete and pkg_add with the following general kind of messages: err: pkg_add: package MYPACKAGE has no origin recorded I can see from some old FreeBSD lists that the +CONTENTS file in the package must have a line like this: @comment ORIGIN:some_source_path What I don't see is a way to get this line in place using EPM. Can somebody tell me how to do this?

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  • Delete Stored Proc Deadlock in Sql Server

    - by Chris
    I am having the following deadlock in SQL Server 2005 with a specific delete stored proc and I can't figure out what I need to do to remedy it. <deadlock-list> <deadlock victim="processf3a868"> <process-list> <process id="processcae718" taskpriority="0" logused="0" waitresource="KEY: 7:72057594340311040 (b50041b389fe)" waittime="62" ownerId="1678098" transactionguid="0x950057256032d14db6a2c553a39a8279" transactionname="user_transaction" lasttranstarted="2010-05-26T13:45:23.517" XDES="0x8306c370" lockMode="RangeS-U" schedulerid="1" kpid="2432" status="suspended" spid="59" sbid="0" ecid="0" priority="0" transcount="2" lastbatchstarted="2010-05-26T13:45:23.717" lastbatchcompleted="2010-05-26T13:45:23.717" clientapp=".Net SqlClient Data Provider" hostname="DEVELOPER01" hostpid="28104" loginname="DEVELOPER01\ServiceUser" isolationlevel="serializable (4)" xactid="1678098" currentdb="7" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056"> <executionStack> <frame procname="DB.dbo.sp_DeleteSecuritiesRecords" line="13" stmtstart="708" stmtend="918" sqlhandle="0x030007008b6b662229b10c014f9d00000100000000000000"> DELETE FROM tSecuritiesRecords WHERE [FilingID] = @filingID AND [AccountID] = @accountID </frame> </executionStack> <inputbuf> Proc [Database Id = 7 Object Id = 577137547] </inputbuf> </process> <process id="processf3a868" taskpriority="0" logused="0" waitresource="KEY: 7:72057594340311040 (4f00409af90f)" waittime="93" ownerId="1678019" transactionguid="0xb716547a8f7fdd40b342e5db6b3699fb" transactionname="user_transaction" lasttranstarted="2010-05-26T13:45:21.543" XDES="0x92617130" lockMode="X" schedulerid="3" kpid="13108" status="suspended" spid="57" sbid="0" ecid="0" priority="0" transcount="2" lastbatchstarted="2010-05-26T13:45:23.717" lastbatchcompleted="2010-05-26T13:45:23.717" clientapp=".Net SqlClient Data Provider" hostname="DEVELOPER01" hostpid="28104" loginname="DEVELOPER01\ServiceUser" isolationlevel="serializable (4)" xactid="1678019" currentdb="7" lockTimeout="4294967295" clientoption1="673185824" clientoption2="128056"> <executionStack> <frame procname="DB.dbo.sp_DeleteSecuritiesRecords" line="13" stmtstart="708" stmtend="918" sqlhandle="0x030007008b6b662229b10c014f9d00000100000000000000"> DELETE FROM tSecuritiesRecords WHERE [FilingID] = @filingID AND [AccountID] = @accountID </frame> </executionStack> <inputbuf> Proc [Database Id = 7 Object Id = 577137547] </inputbuf> </process> </process-list> <resource-list> <keylock hobtid="72057594340311040" dbid="7" objectname="DB.dbo.tSecuritiesRecords" indexname="PK_tTransactions" id="lock82416380" mode="RangeS-U" associatedObjectId="72057594340311040"> <owner-list> <owner id="processf3a868" mode="RangeS-U"/> </owner-list> <waiter-list> <waiter id="processcae718" mode="RangeS-U" requestType="convert"/> </waiter-list> </keylock> <keylock hobtid="72057594340311040" dbid="7" objectname="DB.dbo.tSecuritiesRecords" indexname="PK_tTransactions" id="lock825fd380" mode="RangeS-U" associatedObjectId="72057594340311040"> <owner-list> <owner id="processcae718" mode="RangeS-S"/> </owner-list> <waiter-list> <waiter id="processf3a868" mode="X" requestType="convert"/> </waiter-list> </keylock> </resource-list> </deadlock> </deadlock-list>

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  • Jquery set defaults for all instances of a plugin

    - by Chris
    Given the following plugin how would you set defaults for all the instances? I would like it to work the same as $.datepicker.setDefaults(). (function ($) { $.fn.borderSwitcher = function (options) { defaults = { borderColor: 'Black', borderWidth: '1px', borderStyle: 'solid' }; return this.each(function () { var settings = $.extend(defaults, options); $(this).focus(function () { //find a better way to set border properties var props = settings.borderStyle + ' ' + settings.borderWidth + ' ' + settings.borderColor; $(this).css('border', props); }); $(this).blur(function () { $(this).css('border', ''); }); }); }; })(jQuery);

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  • .Net Entity Framework & POCO ... querying full table problem

    - by Chris Klepeis
    I'm attempting to implement a repository pattern with my poco objects auto generated from my edmx. In my repository class, I have: IObjectSet<E> _objectSet; private IObjectSet<E> objectSet { get { if (_objectSet == null) { _objectSet = this._context.CreateObjectSet<E>(); } return _objectSet; } } public IQueryable<E> GetQuery(Func<E, bool> where) { return objectSet.Where(where).AsQueryable<E>(); } public IList<E> SelectAll(Func<E, bool> where) { return GetQuery(where).ToList(); } Where E is the one of my POCO classes. When I trace the database and run this: IList<Contact> c = contactRepository.SelectAll(r => r.emailAddress == "[email protected]"); It shows up in the sql trace as a select for everything in my Contact table. Where am I going wrong here? Is there a better way to do this? Does an objectset not lazy load... so it omitted the where clause? This is the article I read which said to use objectSet's... since with POCO, I do not have EntityObject's to pass into "E" http://devtalk.dk/CommentView,guid,b5d9cad2-e155-423b-b66f-7ec287c5cb06.aspx

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  • Any reason not to always log stack traces?

    - by Chris Knight
    Encountered a frustrating problem in our application today which came down to an ArrayIndexOutOfBounds exception being thrown. The exception's type was just about all that was logged which is fairly useless (but, oh dear legacy app, we still love you, mostly). I've redeployed the application with a change which logs the stack trace on exception handling (and immediately found the root cause of the problem) and wondered why no one else did this before. Do you generally log the stack trace and is there any reason you wouldn't do this? Bonus points if you can explain (why, not how) the rationale behind having to jump hoops in java to get a string representation of a stack trace!

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  • Appengine BulkExport via Batch File

    - by Chris M
    I've created a batch file to run a bulk export on appengine to a dated file @echo off FOR /F "TOKENS=1* DELIMS= " %%A IN ('DATE/T') DO SET CDATE=%%B FOR /F "TOKENS=1,2 eol=/ DELIMS=/ " %%A IN ('DATE/T') DO SET mm=%%B FOR /F "TOKENS=1,2 DELIMS=/ eol=/" %%A IN ('echo %CDATE%') DO SET dd=%%B FOR /F "TOKENS=2,3 DELIMS=/ " %%A IN ('echo %CDATE%') DO SET yyyy=%%B SET date=%yyyy%%mm%%dd% FOR /f "tokens=1" %%u IN ('TIME /t') DO SET t=%%u IF "%t:~1,1%"==":" SET t=0%t% @REM set timestr=%d:~6,4%%d:~3,2%%d:~0,2%%t:~0,2%%t:~3,2% set time=%t:~0,2%%t:~3,2% @echo on "c:\Program Files\Google\google_appengine\appcfg.py" download_data --config_file=E:\FEEDSYSTEMS\TRACKER\TRACKER\tracker-export.py --filename=%date%data_archive.csv --batch_size=100 --kind="SearchRec" ./TRACKER I cant work out how to get it to authenticate with google automatically; at the moment I get asked the user/pass everytime which means I have to run it manually. Any Ideas?

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  • Using IOperationBehavior to supply a WCF parameter

    - by Chris Kemp
    This is my first step into the world of stackoverflow, so apologies if I cock anything up. I'm trying to create a WCF Operation which has a parameter that is not exposed to the outside world, but is instead automatically passed into the function. So the world sees this: int Add(int a, int b) But it is implemented as: int Add(object context, int a, int b) Then, the context gets supplied by the system at run-time. The example I'm working with is completely artificial, but mimics something that I'm looking into in a real-world scenario. I'm able to get close, but not quite the whole way there. First off, I created a simple method and wrote an application to confirm it works. It does. It returns a + b and writes the context as a string to my debug. Yay. [OperationContract] int Add(object context, int a, int b); I then wrote the following code: public class SupplyContextAttribute : Attribute, IOperationBehavior { public void Validate(OperationDescription operationDescription) { if (!operationDescription.Messages.Any(m => m.Body.Parts.First().Name == "context")) throw new FaultException("Parameter 'context' is missing."); } public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation) { dispatchOperation.Invoker = new SupplyContextInvoker(dispatchOperation.Invoker); } public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation) { } public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters) { // Remove the 'context' parameter from the inbound message operationDescription.Messages[0].Body.Parts.RemoveAt(0); } } public class SupplyContextInvoker : IOperationInvoker { readonly IOperationInvoker _invoker; public SupplyContextInvoker(IOperationInvoker invoker) { _invoker = invoker; } public object[] AllocateInputs() { return _invoker.AllocateInputs().Skip(1).ToArray(); } private object[] IntroduceContext(object[] inputs) { return new[] { "MyContext" }.Concat(inputs).ToArray(); } public object Invoke(object instance, object[] inputs, out object[] outputs) { return _invoker.Invoke(instance, IntroduceContext(inputs), out outputs); } public IAsyncResult InvokeBegin(object instance, object[] inputs, AsyncCallback callback, object state) { return _invoker.InvokeBegin(instance, IntroduceContext(inputs), callback, state); } public object InvokeEnd(object instance, out object[] outputs, IAsyncResult result) { return _invoker.InvokeEnd(instance, out outputs, result); } public bool IsSynchronous { get { return _invoker.IsSynchronous; } } } And my WCF operation now looks like this: [OperationContract, SupplyContext] int Amend(object context, int a, int b); My updated references no longer show the 'context' parameter, which is exactly what I want. The trouble is that whenver I run the code, it gets past the AllocateInputs and then throws an Index was outside the bounds of the Array. error somewhere in the WCF guts. I've tried other things, and I find that I can successfully change the type of the parameter and rename it and have my code work. But the moment I remove the parameter it falls over. Can anyone give me some idea of how to get this to work (or if it can be done at all).

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  • Returning a C++ reference in a const member functionasses

    - by Chris Kaminski
    A have a class hierarchy that looks somethign like this: class AbstractDataType { public: virtual int getInfo() = 0; }; class DataType: public AbstractDataType { public: virtual int getInfo() { }; } class Accessor { DataType data; public: const AbstractDataType& getData() const { return(data); } } Well, GCC 4.4 reports: In member function ‘const AbstractDataType& Accessor::getData() const’: error: invalid initialization of reference of type ‘const AbstractDataType&’ from expression of type ‘const DataType’ Where am I going wrong - is this a case where I MUST use a pointer?

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  • Pointers, am I doing them correctly? Objective-c/cocoa

    - by Chris
    I have this in my @interface struct track currentTrack; struct track previousTrack; int anInt; Since these are not objects, I do not have to have them like int* anInt right? And if setting non-object values like ints, boolean, etc, I do not have to release the old value right (assuming non-GC environment)? The struct contains objects: typedef struct track { NSString* theId; NSString* title; } *track; Am I doing that correctly? Lastly, I access the struct like this: [currentTrack.title ...]; currentTrack.theId = @"asdf"; //LINE 1 I'm also manually managing the memory (from a setter) for the struct like this: [currentTrack.title autorelease]; currentTrack.title = [newTitle retain]; If I'm understanding the garbage collection correctly, I should be able to ditch that and just set it like LINE 1 (above)? Also with garbage collection, I don't need a dealloc method right? If I use garbage collection does this mean it only runs on OS 10.5+? And any other thing I should know before I switch to garbage collected code? Sorry there are so many questions. Very new to objective-c and desktop programming. Thanks

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  • Using C++, how to call a base class method from a derived class method and apply this to an object passed as an argument?

    - by Chris
    I can't figure out how to call a base class method from a derived class method but concurrently applying this method call at an object passed as argument. What I mean is this: class Animal { virtual void eat(Animal& to_be_eaten) = 0; }; class Carnivores: public Animal { virtual void eat(Animal& to_be_eaten) { /*implementation here*/} }; class Wolf : public Carnivores { virtual void eat(Animal& to_be_eaten) { /*call eat method(of Base class) of Base to_be_eaten here*/ } } I thought of something like this dynamic_cast<Carnivores&>(to_be_eaten).eat(*this) //and got a segmentation fault Is there any way for this to be done? Thank you! New edit:: Updated the code

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