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• Getting "Illegal Seek" error after calling accept()

  - by Bilthon

  Well.. it's pretty much that, I seem to be getting a "Illegal Seek" error when checking my errno variable. The problem is that I have no idea of what that can mean. I know sockets are treated like files in unix, but I can't see how can this be related to sockets. What I'm doing exactly is: int sck = ::accept(m_socket, (struct sockaddr*)&client_address, (socklen_t*)&address_len); Then I get sck = -1 and errno = ESPIPE And the weird thing is that it happens randomly. I mean, sometimes the code works fine, and sometimes it just thows an exception. I'm working with threads so that's understandable. But I just would like to know what kind of behaviour makes the accept() call to set errno as ESPIPE so I could check the paramethers for instance. Thanks Nelson R. Pérez

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• If you are forced to use an Anemic domain model, where do you put your business logic and calculated

  - by Jess

  Our current O/RM tool does not really allow for rich domain models, so we are forced to utilize anemic (DTO) entities everywhere. This has worked fine, but I continue to struggle with where to put basic object-based business logic and calculated fields. Current layers: Presentation Service Repository Data/Entity Our repository layer has most of the basic fetch/validate/save logic, although the service layer does a lot of the more complex validation & saving (since save operations also do logging, checking of permissions, etc). The problem is where to put code like this: Decimal CalculateTotal(LineItemEntity li) { return li.Quantity * li.Price; } or Decimal CalculateOrderTotal(OrderEntity order) { Decimal orderTotal = 0; foreach (LineItemEntity li in order.LineItems) { orderTotal += CalculateTotal(li); } return orderTotal; } Any thoughts?

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• Writing a simple RSpec test to check that Rake tasks are correct

  - by John Feminella

  I'm trying to be diligent about checking my rake tasks with RSpec tests, but in the process of feeling my way around I seem to have hit a wall. I've got a really simple RSpec test that looks like this: # ./test/meta_spec.rb describe "Rake tasks" do require 'rake' before(:each) do @rake = Rake::Application.new @rake.load_rakefile # => Error here! Rake.application = @rake end after(:each) do Rake.application = nil end it "should have at least one RSpec test to execute" do Rake.application["specs"].spec_files.size.should > 0 end end I have a simple task called "specs" defined in ./Rakefile.rb which has an RSpec task that includes all the *_spec.rb files. If I put the @rake.load_rakefile method in, I want that Rakefile to load. But instead it just bombs out. If I comment it out, however, the test fails because the "specs" task is (understandably) not defined. Where am I going wrong?

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• SoundPlayer causing Memory Leaks?

  - by Nick Udell

  I'm writing a basic writing app in C# and I wanted to have the program make typewriter sounds as you typed. I've hooked the KeyPress event on my RichTextBox to a function that uses a SoundPlayer to play a short wav file every time a key is pressed, however I've noticed after a while my computer slows to a crawl and checking my processes, audiodlg.exe was using 5 GIGABYTES of RAM. The code I'm using is as follows: I initialise the SoundPlayer as a global variable on program start with SoundPlayer sp = new SoundPlayer("typewriter.wav") Then on the KeyPress event I simply call sp.Play(); Does anybody know what's causing the heavy memory usage? The file is less than a second long, so it shouldn't be clogging the thing up too much.

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• Would watching a file for changes or redundantly querying that file be more efficient?

  - by badpanda

  I am wondering whether watching a file/directory for changes using the FileSystemWatcher class is extremely memory intensive. I am developing a desktop application in C# that will be running behind the scenes continuously on low-performance computers, and I need some way of checking to see if various files have changed. I can think of a few solutions: Watch the directories using FileSystemWatcher. Run a timed thread on an interval that goes through and manually checks this. Check manually every time the actionhandler thread runs (the program will occasionally do something, on an action). Any suggestions? Thanks! badPanda

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• Generic test suite for ASP.NET Membership/Role/Profile/Session Providers

  - by SztupY

  Hi! I've just created custom ASP.NET Membership, Role, Profile and Session State providers, and I was wondering whether there exists a test suite or something similar to test the implementation of the providers. I've checked some of the open source providers I could find (like the NauckIt.PostgreSQL provider), but neither of them contained unit tests, and all of the forum topics I've found mentioned only a few test cases (like checking whether creating a user works), but this is clearly not a complete test suite for a Membership provider. (And I couldn't find anything for the other three providers) Are there more or less complete test suites for the above mentioned providers, or are there custom providers out there that have at least some testing avaialable?

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• How does memory management in Java and C# differ?

  - by David Johnstone

  I was reading through 2010 CWE/SANS Top 25 Most Dangerous Programming Errors and one of the entries is for Buffer Copy without Checking Size of Input. It suggests using a language with features to prevent or mitigate this problem, and says: For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. I was not aware that Java and C# differed in any meaningful way with regard to memory management. How is it that Java is not subject to buffer overflows, while C# only protects against overflows? And how is it possible to disable this protection in C#?

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• Android HelloWorld Build Path error

  - by BahaiResearch.com

  On my Mac I installed Eclipse, the SDK and created a new project, then hit build expecting to see my first helloworld app. I got the error "the project cannot be built until build path errors are fixed". After going thru all the path-like options in Preferences, I noticed that on the tab "Java Build Path" the "Google APIs [Android 2.2]" option did not have its check box checked. Checking it made the problem go away. It works now and I can see the app in the Emulator Have I not set up my environment correctly? I used all the defaults in Eclipse and the Android SDK.

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• Subversion terminology. Difference between projects, modules and root directories

  - by aioobe

  I'm setting up a repository for me and some colleagues. I have a subversion repository at hand, and all required rights. The usual directory-skeleton has been set up for me (branches, tags and trunk). Now I'm about to create a directory for me and my colleagues to put our files in. I'm quite sure the right place to put it is in trunk. Now here and there in tutorials, I see terms like "modules" and "projects" such as in Checking Out a Project - svn checkout svn checkout http://host_name/svn_dir/repository_name/project/trunk proj Is proj in the above line some glorified directory in trunk? Should I do something else than a checkout on trunk, mkdir and then commit when creating a directory for me and my colleagues? Whats the difference between a project, a directory in trunk and a module?

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• Why do AlarmManager broadcasts get cancelled when app gets killed?

  - by skooter

  Ok so I have two BroadcastReceiver registered. When the app is closed they both fire at the appropriate times and do the appropriate things. If the app is closed then killed (say with an AppKiller), the receivers never receive their broadcasts, and nothing happens. Presumably the same thing happens if the parent app is killed due to low memory, so how do I ensure those broadcasts are fired/received. The API states that even if the app is killed it should fire, does anyone else have experience with this situation? If it helps my manifest is: <!-- receivers for AlarmManager --> <receiver android:exported="true" android:label="Shift roster updating calendar." android:name="com.skooter.shiftroster.backend.service.UpdateCalendar" > </receiver> <receiver android:exported="true" android:label="Shift roster checking alarm." android:name="com.skooter.shiftroster.backend.service.SetWakeup" > </receiver> and nothing esoteric is going on in the AlarmManager/BroadcastReceivers

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• Determine if count of related model > 0

  - by Lowgain

  I have a model called Stem. I need a 'thumbs up' feature, so I have created a second model called Thumb, which consists of stem_id and user_id. I'm also using the restful authentication plugin for user credentials. I have the 'thumbs up' button working, which adds a row to the thumbs table fine, but I'd like to be able to check if the currently logged in user has already given a thumbs up to this particular stem. I tried adding this to the Stem model: def thumbed Thumb.count_by_sql ["SELECT COUNT(*) FROM thumbs WHERE user_id = ? AND stem_id = ?", current_user.id, self.id ] end The problem here is that the stem model has no access to the current_user variable the the controllers have. Is there a way I can get access to this property, or alternatively, is there another way I could go about checking this? I was hoping to get this as a property in the model because the stems are passed over to a Flex app using RubyAMF. Thanks!

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• How do you get subversion diff summary to ignore mergeinfo properties?

  - by tolomea

  I have subversion 1.6.5 client and 1.5.4 server. And I mostly only care about diffs on fully repository paths, not working copies. When diffing branches ones that have been merged already show up as identical except for the mergeinfo properties. This is a touch annoying for a human who has to then look through the changes looking for anything that might be a real change. However it's somewhat worse in out use case as we have scripts that run around checking on the merge state of various things and the mergeinfo properties cause them to highlight a lot of things as being out of sync when they aren't. Is there a way to get the diff summary to ignore the mergeinfo properties?

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• How do you use vim's quickfix feature?

  - by hora

  I'm a pretty new Vim user and I've found that its learning curve is quite steep (at least for me). I just installed this vim script for JavaScriptLint error checking, which shows errors in vim's quickfix window once I save a buffer. However, I don't know what to do next.. How do I 'scroll' through all the errors? How do I close the quickfix 'window'? How do I get it to check for errors after I've made changes to my code? I've looked at the vim quickfix docs but the amount of commands are overwhelming and I can't seem to find what I want. Any help would be appreciated. A side question: is there any way to have javascriptlint check for js errors for code residing in a .html file? Thanks!

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• MS-Access nested DIR - check if a file exists elsewhere whilst looping through a folder

  - by David Carle

  I have used the DIR() command in Microsoft Access 2003 to loop through the files in folder A. This works fine, but I need to check if each file also exists in another location (folder B), and only process the file if it doesn't exist in folder B. The problem is that checking for the file existing in folder B also uses the DIR() function and this then resets or confuses the original one, with the result that no further files are found in folder A. Is there a way to check if a file exists without using DIR? Or, is there a way to have a separate instance of DIR? I suppose I could build a list of the files in folder A into an array and then process the entries in the array, but this seems rather 'clunky' Any suggestions for a better solution? Thanks

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• Another answer to the CAPTCHA problem?

  - by Xeoncross

  Most sites at least employ server access log checking and banning along with some kind of bot prevention measure like a CAPTCHA (those messed-up text images). The problem with CAPTCHAs is that they poss a threat to the user experience. Luckily they now come with user friendly features like refresh and audio versions. Anyway, like linux vs windows, it isn't worth the time of a spammer to customize and/or build a script to handle a custom CAPTCHA example that only pertains to one site. Therefore, I was wondering if there might be better ways to handle the whole CAPTCHA thing. In A Better CAPTCHA Peter Bromberg mentions that one way would be to convert the image to HTML and display it embedded in the page. On http://shiflett.org/ Chris simply asks users to type his name into an input. Examples like this are ways to simplifying the CAPTCHA experience while decreasing the value for spammers. Does anyone know of more good examples I could use or see any problem with the embedded image idea?

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• Problem with writing if condition

  - by Himadri

  I have two decimal numbers. I want those number to be same upto 4 decimal points without rounding. If numbers are different I want 2nd number to be replaced by 1st. What if condition should I write? Eg, 1. num1 = 0.94618976 num2 = 0.94620239 If we round these numbers upto 4 decimal then we get 0.9462 same number, but I don't want to round these numbers. 2. num1 = 0.94620239 num2 = 0.94639125 The one way I found is take absolute difference of both numbers say diff and then check the value. My problem is of checking the range of diff. I am using delphi but you can answer in any language.Thank You.

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• How to run a loop of queries in access?

  - by tksy

  Hi I have a database with a table which is full of conditions and error messages for checking another database. I want to run a loop such that each of these conditions is checked against all the tables in the second database and generae a report which gives the errors. Is this possible in ms access. For example, querycrit table id query error 1 speed<25 and speed>56 speed above limit 2 dist<56 or dist >78 dist within limit I have more than 400 queries like this of different variables. THe table against which I am running the queries is records table id speed dist accce decele aaa bbb ccc 1 33 34 44 33 33 33 33 2 45 44 55 55 55 22 23 regards ttk

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• How to check if a variable exists in a FreeMarker template?

  - by Don

  Hi, I have a Freemarker template which contains a bunch of placeholders for which values are supplied when the template is processed. I want to conditionally include part of the template if the userName variable is supplied, something like: [#if_exists userName] Hi ${userName}, How are you? [/#if_exists] However, the FreeMarker manual seems to indicate that if_exists is deprecated, but I can't find another way to achieve this. Of course, I could simple providing an additional boolean variable isUserName and use that like this: [#if isUserName] Hi ${userName}, How are you? [/#if] But if there's a way of checking whether userName exists then I can avoid adding this extra variable. Cheers, Don

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• Typescript + requirejs: How to handle circular dependencies?

  - by Aymeric Gaurat-Apelli

  I am in the process of porting my JS+requirejs code to typescript+requirejs. One scenario I haven't found how to handle is circular dependencies. Require.js returns undefined on modules that are also dependent on the current and to solve this problem you can do: MyClass.js define(["Modules/dataModel"], function(dataModel){ return function(){ dataModel = require("Modules/dataModel"); ... } }); Now in typescript, I have: MyClass.ts import dataModel = require("Modules/dataModel"); class MyClass { dataModel: any; constructor(){ this.dataModel = require("Modules/dataModel"); // <- this kind of works but I lose typechecking ... } } How to call require a second time and yet keep the type checking benefits of typescript? dataModel is a module { ... }

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• .NET Remoting Client's Problem when running on the machine with Multi NICs

  - by cui chun

  I built a .NET Remoting Client which works quite fine on the machine of single NIC, and lots of testing messages received via remoting event. But when additional NIC was added, the Client seemed to be able to connect the remoting Server, but the testing messages cannot arrive anymore. From debugging, the server end did trigger the event but the client didn't get that. Checking from google and find that a similar problem report: http://www.eggheadcafe.com/community/aspnet/2/10061570/reply.aspx I just wonder if any solutions? Thanks in advance!

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• Tag/Keyword based recommendation

  - by Hellnar

  Hello I am wondering what algorithm would be clever to use for a tag driven e-commerce enviroment: Each item has several tags. IE: Item name: "Metallica - Black Album CD", Tags: "metallica", "black-album", "rock", "music" Each user has several tags and friends(other users) bound to them. IE: Username: "testguy", Interests: "python", "rock", "metal", "computer-science" Friends: "testguy2", "testguy3" I need to generate recommendations to such users by checking their interest tags and generating recommendations in a sophisticated way. Ideas: A Hybrid recommendation algorithm can be used as each user has friends.(mixture of collaborative + context based recommendations). Maybe using user tags, similar users (peers) can be found to generate recommendations. Maybe directly matching tags between users and items via tags. Any suggestion is welcome. Any python based library is also welcome as I will be doing this experimental engine on python language.

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• How to regex match a string of alnums and hyphens, but which doesn't begin or end with a hyphen?

  - by Shahar Evron

  I have some code validating a string of 1 to 32 characters, which may contain only alpha-numerics and hyphens ('-') but may not begin or end with a hyphen. I'm using PCRE regular expressions & PHP (albeit the PHP part is not really important in this case). Right now the pseudo-code looks like this: if (match("/^[\p{L}0-9][\p{L}0-9-]{0,31}$/u", string) and not match("/-$/", string)) print "success!" That is, I'm checking first that the string is of right contents, doesn't being with a '-' and is of the right length, and then I'm running another test to see that it doesn't end with a '-'. Any suggestions on merging this into a single PCRE regular expression? I've tried using look-ahead / look-behind assertions but couldn't get it to work.

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• Checkstyle for C#?

  - by PSU_Kardi

  I'm looking to find something along the lines of Checkstyle for Visual Studio. I've recently started a new gig doing .NET work and realized that coding standards here are a bit lacking. While I'm still a young guy and far from the most experienced developer I'm trying to lead by example and get things going in the right direction. I loved the ability to use Checkstyle with Eclipse and examine code before reviews so I'd like to do the same thing with Visual Studio. Anyone have any good suggestions? Another thing I'd be somewhat interested in is a plug-in for SVN that disallows check-in until the main coding standards are met. I do not want people checking in busted code that's going to wind up in a code review. Any suggestions at this point would be great.

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• Css attribute selector for input type="button" not working on IE7

  - by Cesar Lopez

  Hi all, I am working on a big form and it contains a lot of buttons all over the form, therefore I am trying to get working input[type="button"] in my main css file so it would catch all buttons with out having to add a class to every single one, for some reason this is not working on IE7, after checking on the web it says that IE7 should be supporting this. Also it has to be type="button" and not type="submit" as not all buttons will submit the form. Could anybody give a hint what am I doing wrong? input[type="button"]{ text-align:center; } I have also tried input[type=button] Any help would be very much apreciated.

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• Algorithmic trading software safety guards

  - by Adal

  I'm working on an automatic trading system. What sorts of safe-guards should I have in place? The main idea I have is to have multiple pieces checking each other. I will have a second independent little process which will also connect to the same trading account and monitor simple things, like ensuring the total net position does not go over a certain limit, or that there are no more than N orders in 10 minutes for example, or more than M positions open simultaneously. You can also check that the actual open positions correspond to what the strategy process thinks it actually holds. As a bonus I could run this checker process on a different machine/network provider. Besides the checks in the main strategy, this will ensure that whatever weird bug occurs, nothing really bad can happen. Any other things I should monitor and be aware of?

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