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• Access Control Lists basics

  - by vtortola

  Hi, I'm gonna add authorization, user and groups management to my application, basically... you will can define a set of permissions for a concrete user or group. For example, you could specify whom can use a concrete resource. So I want to ensure that my assumptions about ACLs are right: A basic rule could be "Grant", "Deny", "NoSet". User permissions have priority over group permissions. "Deny" statement has priority over "Grant". For example, user "u1" belongs to group "A", the resource "X" has this ACL "u1:grant,A:deny" user "u1" should be able to access the resource, shouldn't it? If a resource has no ACL set... does it means that anyone can access it? should I provide a default ACL? Any document about ACL in a general way? Cheers.

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• Is it possible to share a C struct in shared memory between apps compiled with different compilers?

  - by Joseph Garvin

  I realize that in general the C and C++ standards gives compiler writers a lot of latitude. But in particular it guarantees that POD types like C struct members have to be laid out in memory the same order that they're listed in the structs definition, and most compilers provide extensions letting you fix the alignment of members. So if you had a header that defined a struct and manually specified the alignment of its members, then compiled two apps with different compilers using the header, shouldn't one app be able to write an instance of the struct into shared memory and the other app be able to read it without errors? I am assuming though that the size of the types contained is consistent across two compilers on the same architecture (it has to be the same platform already since we're talking about shared memory). I realize that this is not always true for some types (e.g. long vs. long long in GCC and MSVC 64-bit) but nowadays there are uint16_t, uint32_t, etc. types, and float and double are specified by IEEE standards.

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• File upload iis7

  - by maxwell

  Hi, I have a website and my users can browse the website for general information. If user wants to post any data, they need to register in the website. At the time of registration (in registration form) they can upload their photo. Once registration process is completed they can even modify the previously uploaded photo. My users are facing problem while they uploading their photo at the time of registration. I have given write permission to uploading files folder. But it is giving "Access denied" error. There should be a provision to upload files with or without logging into application. How can we achieve this?

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• C# Speech Recognition

  - by fonix232

  I am making a Smart House Control System right now, and I have a little problem. I was thinking on using Cosmos for a base system, and adding the needed namespace libraries to it, but as the usual System.Speech.Recognition namespace depends too much on Windows Speech API, I have to forget about using it. So my question is, is there any (free if possible) voice recognition and/or speech speech synthesizer library for C#, what has the following: support for multi-language speaking extracting text content from speech sample synthesizing speech with selectable (or user-written) speech pattern (voice) A general usage, non-windows dependent library would be the best, and of course, if it was free too.

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• AJAX: how to get progress feedback in web apps, and to avoid timeouts on long requests?

  - by David Dombrowsky

  This is a general design question about how to make a web application that will receive a large amount of uploaded data, process it, and return a result, all without the dreaded spinning beach-ball for 5 minutes or a possible HTTP timeout. Here's the requirements: make a web form where you can upload a CSV file containing a list of URLs when the user clicks "submit", the server fetches the file, and checks each URL to see if its alive, and what the title tag of the page is. the result is a downloadable CSV file containing the URL, and the result HTTP code the input CSV can be very large ( 100000 rows), so the fetch process might take 5-30 minutes. My solution so far is to have a spinning javascript loop on the client site, which queries the server every second to determine the overall progress of the job. This seems kludgy to me, and I'm hesitant to accept this as the best solution. I'm using perl, template toolkit, and jquery, but any solution using any web technology would be acceptable.

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• Is it possible to find the KNN for a node that is *IN* the KD-tree?

  - by Stephen

  Hi there, Trying to create a KNN search using a KD-tree. I can form the KD-tree fine (or at least, I believe I can!). My problem is that I am searching to find the closest 2 neighbours to every point in a list of points. So, is there a method to find the K nearest neighbours to a point using a KD tree even if the point is actually IN the tree, or do I need to construct a seperate KD tree for each point, leaving out the point that I wish to search for? My implementation language is C++, but I am more looking for either an algorithm or general help, thanks! Thanks, Stephen

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• Formatting an indented list in CSS

  - by Colen

  Hi, Let's say I have a list, with an arbitrary number of indentation levels, like so: Item Item Item Item Item Item Item Item Item Item Item If I'm displaying this list in an HTML document, how can I use CSS to handle the indentation? There might be an arbitrary number of indentation levels (although in practice there isn't going to be more than 5 or so). I don't want to create an "indent1" class that indents 10 pixels, an "indent2" class that indents 20 pixels, etc - that's clumsy. Is it possible to create a general rule that will indent by a certain distance based on an attribute value, or the position of an element in the hierarchy?

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• Is it possible to make the AntiForgeryToken value in ASP.NET MVC change after each verification?

  - by jmcd

  We've just had some Penetration Testing carried out on an application we've built using ASP.NET MVC, and one of the recommendations that came back was that the value of the AntiForgeryToken in the Form could be resubmitted multiple times and did not expire after a single use. According to the OWASP recommendations around the Synchronizer Token Pattern: "In general, developers need only generate this token once for the current session." Which is how I think the ASP.NET MVC AntiForgeryToken works. In case we have to fight the battle, is it possible to cause the AntiForgeryToken to regenerate a new value after each validation?

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• Parsing SGF files in C#

  - by mafutrct

  The text-based Smart Game Format has become the sole file format for exchanging Go game records by now. I stared with disbelieve that there are almost no parsers available. Google yielded a few results in antique Java and Python, but no modern implementations. I am curious if I have to write my own parser. Do you know of a modern implementation in C# or Java? In case there really are no parsers available, how should I implement one? Are there general guidelines or tools (in a C# environment) I should know of? This is an example file: (;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2] RU[Japanese]SZ[19]KM[6.50] PW[White]PB[Black] ;B[pd] ;W[dc] ;B[dq] ;W[pp] ;B[ce] (;W[ed] ;B[ci] ;W[kc]) (;W[do] ;B[dl] ;W[gp] ;B[eo] ;W[en] ;B[fo]))

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• django-rest-framework: api versioning

  - by w--

  so googling around it appears that the general consensus is that embedding version numbers in REST URIs is a bad practice and a bad idea. even on SO there are strong proponents supporting this. e.g. Best practices for API versioning? My question is about how to accomplish the proposed solution of using the accept header / content negotiation in the django-rest-framework to accomplish this. It looks like content negotiation in the framework, http://django-rest-framework.org/api-guide/content-negotiation.html is already configured to automatically return intended values based on accepted MIME types. If I start using the Accept header for custom types, I'll lose this benefit of the framework. Is there a better way to accomplish this in the framework?

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• Best Practices - Data Annotations vs OnChanging in Entity Framework 4

  - by jptacek

  I was wondering what the general recommendation is for Entity Framework in terms of data validation. I am relatively new to EF, but it appears there are two main approaches to data validation. The first is to create a partial class for the model, and then perform data validations and update a rule violation collection of some sort. This is outlined at http://msdn.microsoft.com/en-us/library/cc716747.aspx The other is to use data annotations and then have the annotations perform data validation. Scott Guthrie explains this on his blog at http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx. I was wondering what the benefits are of one over the other. It seems the data annotations would be the preferred mechanism, especially as you move to RIA Services, but I want to ensure I am not missing something. Of course, nothing precludes using both of them together. Thanks John

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• Best Practices for Source Control Dependencies

  - by VirtuosiMedia

  How do you handle source control setup of a project that has dependency on a separate framework or library? For example, Project A uses Framework B. Should Project A also include the code from Framework B in its repository? Is there a way for it to be included automatically from a different repository or would I have to updated it manually? What are the general approaches are usually taken for this scenario? Assume that I control the repositories for both Project A and Framework B and that the source code for both is not compiled. Any resources or suggestions would be greatly appreciated. I'm currently using Subversion (on a very basic level), but I would like to switch to Mercurial so that I can try out Kiln with Fogbugz. Edit: In Mercurial, would you use parent repositories for this function?

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• Learn MacRuby or Objective-C?

  - by MaxD

  Well, my fisrt question was a bit too general so i ll try again and hope this one is better. The way i see it is: Ruby-MacRuby or IronRuby or Rails Obj-c-Mac Development So Ruby has clearly more potential in desktop and web platforms and now with MacRuby, OSX native (and commercial) apps are on the way. If i get it wrong please correct me. For me that i will do a fresh start should i go with the modern Ruby or start learning c+obj-c? Will a newcomer benefit much (in learning & coding time, frustration, complexity) by learning/using macruby for osx apps rather objective-c? Or its pretty much the same? I hope some day to hang around here and help others.

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• WCF Data Services implementation strategies.

  - by Nix

  Microsoft has done a savvy job of not outlining the actual place for data services in the wonderful world of SOA/Web dev. So my question is simple, are WCF Data Services designed to be used via clients? Or has anyone ever heard of someone using them on the server side? Simple scenario a general layered architecture using BO business objects (parenthesis indicate what is being passed between layers) (XML) WCF Service - (BO)Business Logic - (BO) Dao - Entity Framework or using data services it would be where DS BO are modeled business entities to be used in data service. (XML) WCF Service -(BO) Business Logic - (BO) WCF Data Service - (DS BO)Server I can't see a use for the later, unless there are going to be a lot of cases people would be accessing your data via your Data Service Layer vs the Service layer? Thoughts anyone? I have not seen any mention of using DS from within a Service Layer....

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• Logic / Probability Question: Picking from a bag

  - by Rosarch

  I'm coding a board game where there is a bag of possible pieces. Each turn, players remove randomly selected pieces from the bag according to certain rules. For my implementation, it may be easier to divide up the bag initially into pools for one or more players. These pools would be randomly selected, but now different players would be picking from different bags. Is this any different? If one player's bag ran out, more would be randomly shuffled into it from the general stockpile.

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• How to create a Clob in JPA in an implementation agnostic way

  - by kazanaki

  Hello I am using Ejb3 and JPA (based on Hibernate and Oracle 10g at the moment) I have an entity that contains a clob @Entity @Table(name = "My_TAB") public class ExampleEntity implements java.io.Serializable { private Clob someText; public void setSomeText(Clob someText) { this.someText= someText; } @Column(name = "COLUMN_NAME") public Clob getSomeText() { return this.someText; } Then I want to save an entity of this type. At the moment I am doing the following which works perfectly ExampleEntity exampleEntity = new ExampleEntity(); exampleEntity.setSomeText(Hibernate.createClob(aStringValue)); someOtherDao.save(exampleEntity); However this ties my code to Hibernate! I have specifically avoided so far Hibernate extensions and used only JPA annotations. The code works because indeed Hibernate is my current implementation. Is there some sort of JPA API that allows me to create a clob in a generic way? So if later I decide to switch to Toplink/EclipseLink or something else I won't have to change a thing?

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• Writing an Iron Python debugger

  - by Kragen

  As a learning exercise I'm writing myself a simple extension / plugin / macro framework using IronPython - I've gotten the basics working but I'd like to add some basic debugging support to make my script editor easier to work with. I've been hunting around on the internet a bit and I've found a couple of good resources on writing managed debuggers (including Mike Stall's excellent .Net Debugging blog and the MSDN documentaiton on the CLR Debugging API) - I understand that IronPython is essentially IL however apart from that I'm a tad lost on how to get started, in particular: Are there any significant differences between debugging a dynamic language (such as IronPython) to a static one (such as C#)? Do I need to execute my script in a special way to get IronPython to output suitable debugging information? Is debugging a script running inside the current process going to cause deadlocks, or does IronPython execute my script in a child process? Am I better off looking into how to produce a simple C# debugger first to get the general idea? (I'm not interested in the GUI aspect of making a debugger for now - I've already got a pretty good idea of how this might work)

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• Dependency Injection book recommendation(s)

  - by Portman

  It seems like there are very few books (yes, I read books) on Dependency Injection. The Amazon tag for "dependency injection" lists only a few titles, and all of them are specifically about Spring for Java. Are there any books out there that cover DI/IoC in general? Or any that include a survey of multiple DI frameworks? Or any that cover .NET in lieu of or in addition to Java? Or do we have to rely on this newfangled interweb instead of dead trees...

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• Getting error while invoking java weblogic.WLST from C drive

  - by user3718817

  I am getting an error message when I try to invoke java weblogic.WLST monitor.py weblogic weblogic1 t3://localhost:7001 from below mentioned path. C:\Users\satish>java weblogic.WLST monitor.py weblogic weblogic1 t3://127.0.0.1:7001 error Error: Could not find or load main class weblogic.WLST But when I invoke the same command from weblogic home I am not getting any issues. Requesting you to help regarding this. Please find the below class path: C:\Oracle\Middleware\wlserver_10.3\server\bin>setWLSEnv.cmd Error: Could not find or load main class weblogic.WLST Note: I already set class path. Kindly advise where I am getting wrong. Or is there any way that I can invoke my Python script from anywhere?

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• GUI to add a .props file to a VS 2010 project?

  - by jwfearn

  Visual Studio 2010 has no longer uses .vsprops files and instead uses .props files. To add a .vsprops file to a Visual Studio 2008 project, one could right-click the project icon in the Solution Explorer panel, choose Properties, go to the Configuration Properties | General section, and modify the Inherited Project Property Sheets property to contain a list of .vsprops paths. One could also modify the Visual Studio 2008 project file directly. Is there a way in the Visual Studio 2010 GUI to add .props files to a project? The Inherited Project Property Sheets property seems to have been removed. If manual editing of the project file is the only way to include .props files, where can one find documentation on doing it?

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• Python class design - Splitting up big classes into multiple ones to group functionality

  - by Ivo Wetzel

  OK I've got 2 really big classes 1k lines each that I currently have split up into multiple ones. They then get recombined using multiple inheritance. Now I'm wondering, if there is any cleaner/better more pythonic way of doing this. Completely factoring them out would result in endless amounts of self.otherself.do_something calls, which I don't think is the way it should be done. To make things clear here's what it currently looks like: from gui_events import GUIEvents # event handlers from gui_helpers import GUIHelpers # helper methods that don't directly modify the GUI # GUI.py class GUI(gtk.Window, GUIEvents, GUIHelpers): # general stuff here stuff here One problem that is result of this is Pylint complaining giving me trillions of "init not called" / "undefined attribute" / "attribute accessed before definition" warnings.

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• HTTP 404 Error manifests itself as EndPointNotFoundException on a WCF client

  - by dudia

  How can I make my client treat 404 Error correctly? Right now it catches a general exception... My WCF Server uses WebOperationContext.Current.OutgoingResponse.SetStatusAsNotFound(); To return a 404 Error code however my WCF client interperts it as an EndPointNotFoundException There was no endpoint listening at http://myUrl that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details. The inner exception is WebException "The remote server returned an error: (404) Not Found.

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• linear interpolation on 8bit microcontroller

  - by JB

  I need to do a linear interpolation over time between two values on an 8 bit PIC microcontroller (Specifically 16F627A but that shouldn't matter) using PIC assembly language. Although I'm looking for an algorithm here as much as actual code. I need to take an 8 bit starting value, an 8 bit ending value and a position between the two (Currently represented as an 8 bit number 0-255 where 0 means the output should be the starting value and 255 means it should be the final value but that can change if there is a better way to represent this) and calculate the interpolated value. Now PIC doesn't have a divide instruction so I could code up a general purpose divide routine and effectivly calculate (B-A)/(x/255)+A at each step but I feel there is probably a much better way to do this on a microcontroller than the way I'd do it on a PC in c++ Has anyone got any suggestions for implementing this efficiently on this hardware?

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• How to create playable FLV video from part of FLV file using FFMPEG?

  - by Ole Jak

  So we had real FLV video file. we had devided it into 3 parts (more or less equal, not looking into structure orcontext). We have taken second part and forgot about first 2. Video contained audio and video track. mp3 and on vp6. Is it any how possible to play thsat second part after sending to ffmpeg some command? So how to (using any FFMPEG API (in general in any programming language) or using command line) turn bytearray into playable video? (knowing what format video was created in and some other data like used codecs )

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• Asynchronous PHP request (not AJAX)

  - by Renjith R

  Hi I am developing an eshop application. I am using webservice to create Order in Oracle database and websvc will give a response (OrderNumber) and I will inform customer that his Order (OrderNumber) is generated My problem The creation of order is taking too much time in backend system and user is keeping refreshing the page, On each refresh user is coming back to Order create Page, so user is able to click on create Order button again In such cases multiple orders are creating for same orderlines.I can restrict user to create only one order per session in case I got order number in websvc response and I can give ordernumber to customer in next page But real problem come when I didn't get response(Ordernumber) and user is refreshing page. request is already went to Backend system and it will create order and my applicaion will not get response Is there any method in PHP where we can asyncronously check the status of order if first request is initiated by user and it doesn't matter the furthur page navigation Please help me out.. Thanks in advance

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