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• Why not expose a primary key

  - by Angelo Neuschitzer

  In my education I have been told that it is a flawed idea to expose actual primary keys (not only DB keys, but all primary accessors) to the user. I always thought it to be a security problem (because an attacker could attempt to read stuff not their own). Now I have to check if the user is allowed to access anyway, so is there a different reason behind it? Also, as my users have to access the data anyway I will need to have a public key for the outside world somewhere in between. Now that public key has the same problems as the primary key, doesn't it?

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• How would you practice concurrency and multi-threading?

  - by Xavier Nodet

  I've been reading about concurrency, multi-threading, and how "the free lunch is over". But I've not yet had the possibility to use MT in my job. I'm thus looking for suggestions about what I could do to get some practice of CPU heavy MT through exercises or participation in some open-source projects. Thanks. Edit: I'm more interested in open-source projects that use MT for CPU-bound tasks, or simply algorithms that are interesting to implement using MT, rather than books or papers about the tools like threads, mutexes and locks...

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• Authentication for users on a Single Page App?

  - by John H

  I have developed a single page app prototype that is using Backbone on the front end and going to consume from a thin RESTful API on the server for it's data. Coming from heavy server side application development (php and python), I have really enjoyed the new different design approach with a thick client side MVC but am confused on how best to restrict the app to authenticated users who log in. I prefer to have the app itself behind a login and would also like to implement other types of logins eventually (openid, fb connect, etc) in addition to the site's native login. I am unclear how this is done and have been searching - but unsuccessful in finding information that made it clear to me. In the big picture, what is the current best practice for registering users and requiring them to login to use your single page app? Once a user is logged in, how are the api requests authenticated? Can I store a session but how do I detect for this session in the API calls? Any answers to this would be much appreciated!

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• Exposing API through a DLL

  - by MageNewbie

  I have a C++ application; I would like to expose an API from that application allowing me to control the C++ app from a VB6 app. I want to expose the API through a DLL file. Is this a viable option (is it possible) ? I haven’t been able to find any literature on using DLLs in this way. In fact from what I have read it seems like this is not possible because DLLs create their own new instance for every application they are linked in. If you have meet theses requirements in an application you built or if your knowledgeable on the subject, please give me a push in the right direction.

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• How to handle mutiple API calls using javascript/jquery

  - by James Privett

  I need to build a service that will call multiple API's at the same time and then output the results on the page (Think of how a price comparison site works for example). The idea being that as each API call completes the results are sent to the browser immediately and the page would get progressively bigger until all process are complete. Because these API calls may take several seconds each to return I would like to do this via javascript/jquery in order to create a better user experience. I have never done anything like this before using javascript/jquery so I was wondering if there was any frameworks/advice that anyone would be willing to share.

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• Why are there no package management systems for C and C++?

  - by m0nhawk

  There are some programming languages for which exist their own package management systems: CTAN for TeX CPAN for Perl Pip & Eggs for Python Maven for Java cabal for Haskell Gems for Ruby Is there any other languages with such systems? What about C and C++? (that's the main question!) Why there are no such systems for them? And isn't creating packages for yum, apt-get or other general package management systems better?

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• Application Development: Python or Java (or PHP)

  - by luckysmack

  I'm looking to get into application development, such as Facebook or Android apps and games. I am doing this for fun and to learn. Once my skills are to par I would like to have some side income from the apps, but I'm not banking on living off that (just so you know where I'm coming from and know what my end goals are). Currently I know and am familiar with PHP and frameworks such as cakephp and yii. However, I have been wanting to learn another language to broaden my horizons and to become a better developer. So I have narrowed it down to 2 languages. Python, and Java (I can already hear people cringing at the difference in the languages I have chosen, but I have some reasons). Python: closer to PHP that Java. Cross platformability. Also great as a general scripting language and has many file system level benefits that PHP does not. Cleaner syntax, readability, blah blah and the list goed on. Python will work great for cross platform apps and can be run on many OS's and is supported by Facebook for app development. But there is no support on Android (for full fledged apps). Java: a much stronger typed language, very robust community and corporate backing. Knowing Java is also good for personal marketability for enterprises, if you're into that. The main benefit here is that Java can write apps natively for Android and the apps can be ported for web versions to play on Facebook. So while I have seen many developers prefer Java over the two, Java has this significant advantage, where I can market my apps in both markets and in the future build more potential income. But like I said it is for fun. While money isn't the goal, it would still be nice. PHP: I'm putting this here because I know it already, and I'm sure a case could be made for it. It obviously works great for Facebook but like Python does not do so well on android. While it's mostly the realm of 'application development' that appeals to me, I do find Android apps fairly interesting and something that has a ton of potential to. But then again Facebook has a ton more users and the apps can also potentially be more immersive (desktop vs. mobile). So this is why I'm kinda stuck on what route to choose. Python for Facebook and web apps, with likely faster development to production times, or Java which can be developed for any of the platforms to make apps. Side note: I'm not really trying to get into 3D development, mostly 2D. And I also want to make an app with real-time play (websockets, etc). Someone mentioned node, js to me for that but Python seems to be more globally versatile for my goals. So, to anyone that does Facebook or Android development in either language: what do you suggest? Any input is valuable and I do appreciate it. And sorry for being long winded. EDIT: as mentioned in one of the answers, my primary goal is gaming. Although I do have some plans for non gaming apps such as general web based and desktop based ones. But gaming is my main goal with the possibility of income. EDIT: Another consideration could be Jython. Writing Python code which is converted into Java bytecode. This would allow the ability to do Android apps using Python. I could be wrong though, I'm still looking into it. Update 1-26-11: I recently acquired a new job which required I learn .NET using C#. Im sure some of you are cringing already but I really like the whole system and how it all works together between desktop and web development. But, as I am still interested in Python very much, and after some research I have decided I will learn Python as well as the IronPython implementation for .NET. But (again: I know...) since .NET is mostly a Windows thing and not as cross-compatible as I like, I will be learning Mono which is a cross platform implementation of .NET where I can use what I learn at work using C# and what I want to learn, Python/IronPython. So while learning and writing C#/.NET @ work I will be learning Python - Mono - Iron Python for what I want to do personally. And the benefit of them all being very closely related will help me out a lot, I think. What do you guys think? I almost feel like that should be another question, but there's not much of a question. Either way, you guys gave very helpful input.

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• Project Idea - Android

  - by Darren Young

  Hi, I am trying to come up with some project ideas for my final year at University, and I think that I have one that would offer be a (massive) challenge, and something I could potentially make money from. I just want to check something. Is it possible(from a photograph), to be able to determine somebodys face and the individual parts of that face - eyes, ears, nose, etc? This will probably be via Android. Thanks.

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• What should I learn that I missed by not going to school?

  - by BinaryMuse

  I'm a software engineer at a local university, and I feel I'm able to competently do my job, but recently I've been interested in "filling in" the gaps in my knowledge. I suspect I would have learned some of this in school; for example, I don't have a lot of knowledge of sorting algorithms (something I feel is pretty common in college). So, what knowledge am I likely missing by not going to college that I could study on my own? Bonus points for listing resources that might put me on the right track! Some background: I've programmed in PHP, Java, and Ruby (more seriously in Java and Ruby than PHP); I have some experience with C/C++, though my workload doesn't really lend itself to those languages; I work mostly (recently) with the web, using frameworks such as CakePHP and Rails. I'm familiar with SQL (though probably not with some of the theory). Note: The university I work for has no technical classes, so taking courses on the university's dime is a great idea but not possible for me. :)

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• How should I update Ajax Control Toolkit in VS 2010?

  - by Soham

  Suppose if there is a new version available of Ajax Control Toolkit then how should I install/update it in my visual studio 2010 which has already install older version of same toolkit? I would like to install new one while older toolkit would totally uninstalled, because mostly new toolkit always has all controls that were in the old toolkit & also some new controls. Then 1) Should I've to remove .dll file in my toolkit installation folder and place new .dll file there? If I do so then will VS 2010 automatically delete older entries of toolkit controls in .NET Components list and place new control there? Or 2) Should I've to uninstall old toolkit manually i.e delete .dll file and uncheck all entries in .NET Components list & after that install new one from scratch?

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• Release build vs nightly build

  - by Tuomas Hietanen

  Hi! A typical solution is to have a CI (Continuous Integration) build running on a build server: It will analyze the source code, make build (in debug) and run tests, measure test coverage, etc. Now, another build type usually known is "Nightly build": do slow stuff like create code documents, make a setup package, deploy to test environment, and run automatic (smoke or acceptance) tests against the test environment, etc. Now, the question: Is it better to have a third separate "Release build" as release build? Or do "Nightly build" in release mode and use it as a release? What are you using in your company? (The release build should also add some kind of tag to source control of potential product version.)

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• sending credential to linkedIn website and get oauth_verifier without sign in again

  - by akash kumar

  i am facing problem regarding sending credentials to other website and after login(automatically not clicked on sign in here) and get oauth_verifier value Detail is bellow.... I want to send emailaddress and password through form(submit button)from my website(i.e liferay portal) to another website(suppose linkedIn) it should automatically authorize and return oauth_verifier to my website. that mean i dont want my website user to submit emailaddress and password to linkedIn again. actually i want to take emailaddress and password in my website and show the user LinkedIn connection,message,job posting in my website it self,i dont want to redirect user to LinkedIn website and sign in there and again come back to my website. I have taken consumer key and secret key from LinkedIn for my aplication. i am using linkedIn api and getting oauth_verifier for access token but for that i have to take user to LinkedIn for signIn, actually it should happen in backend

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• Humor in Documentation

  - by Lex Fridman

  Is a small amount of lighthearted wording or humor acceptable in source code documentation? For example, I have an algorithm that has a message hop around a graph (network) until its path forms a cycle. When this happens it is removed from the queue of the node it last resided on which removes it from memory. I write that in a comment, and finish the comment with "Rest in peace, little guy". That serves very little documenting purpose, but it cheers me up a bit, and I imagine it might cheer up other people I'm working with as they read through the code. Is this an acceptable practice, or should my in-code documentation resemble as much as possible the speeches of 2004 United States presidential candidate John Kerry? ;-)

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• Looking software for making an animated cartoon to present a new application/scenario idea

  - by Skarab

  I have an idea for an application (+usage scenario) and I would like to create an animated cartoon that shows a use case for this application and its novelty. My company is a rather big so I am looking for an interesting way to get people know my idea to get feedback/get a green light to further develop it. Therefore I am looking for an application (free or commercial) that I could use to realize such an animated cartoon. I have posted this quesion before on stackoverflow, but I think this might be a better community to ask such a question.

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• Design pattern for logging changes in parent/child objects saved to database

  - by andrew

  I’ve got a 2 database tables in parent/child relationship as one-many. I’ve got three classes representing the data in these two tables: Parent Class { Public int ID {get; set;} .. other properties } Child Class { Public int ID {get;set;} Public int ParentID {get; set;} .. other properties } TogetherClass { Public Parent Parent; Public List<Child> ChildList; } Lastly I’ve got a client and server application – I’m in control of both ends so can make changes to both programs as I need to. Client makes a request for ParentID and receives a Together Class for the matching parent, and all of the child records. The client app may make changes to the children – add new children, remove or modify existing ones. Client app then sends the Together Class back to the server app. Server app needs to update the parent and child records in the database. In addition I would like to be able to log the changes – I’m doing this by having 2 separate tables one for Parent, one for child; each containing the same columns as the original plus date time modified, by whom and a list of the changes. I’m unsure as to the best approach to detect the changes in records – new records, records to be deleted, records with no fields changed, records with some fields changed. I figure I need to read the parent & children records and compare those to the ones in the Together Class. Strategy A: If Together class’s child record has an ID of say 0, that indicates a new record; insert. Any deleted child records are no longer in the Together Class; see if any of the comparison child records are not found in the Together class and delete if not found (Compare using ID). Check each child record for changes and if changed log. Strategy B: Make a new Updated TogetherClass UpdatedClass { Public Parent Parent {get; set} Public List<Child> ListNewChild {get;set;} Public List<Child> DeletedChild {get;set;} Public List<Child> ExistingChild {get;set;} // used for no changes and modified rows } And then process as per the list. The reason why I’m asking for ideas is that both of these solutions don’t seem optimal to me and I suspect this problem has been solved already – some kind of design pattern ? I am aware of one potential problem in this general approach – that where Client App A requests a record; App B requests same record; A then saves changes; B then saves changes which may overwrite changes A made. This is a separate locking issue which I’ll raise a separate question for if I’ve got trouble implementing. The actual implementation is c#, SQL Server and WCF between client and server - sharing a library containing the class implementations. Apologies if this is a duplicate post – I tried searching various terms without finding a match though.

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• HTML Canvas: Should my app x, y values be global?

  - by Joe

  I have a large file of functions. Each of these functions is responsible for drawing a particular part of the application. My app has x and y parameters that I use in the setup function to move the whole app around in order to try different placements. So, naturally, I need to use these x and y values to anchor each function's component rendering so that everything moves in unison if the global x,y values ever change. My question is, is it bad practice/architecture to have these x,y values in the global namespace and having the each function directly access them like so? function renderFace() { var x = App.x; var y = App.y; // drawing here } is there a better way i'm missing?

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• Process arbitrarily large lists without explicit recursion or abstract list functions?

  - by Erica Xu

  This is one of the bonus questions in my assignment. The specific questions is to see the input list as a set and output all subsets of it in a list. We can only use cons, first, rest, empty?, empty, lambda, and cond. And we can only define exactly once. But after a night's thinking I don't see it possible to go through the arbitrarily long list without map or foldr. Is there a way to perform recursion or alternative of recursion with only these functions?

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• PowerShell programming conventions

  - by Tahir Hassan

  Do you follow any any conventions when programming in PowerShell? For example, in scripts which are to be maintained long-term do you: Use the real cmdlet name or alias? Specify the cmdlet parameter name in full or only partially (dir -Recurse versus dir -r) When specifying string arguments for cmdlets do you enclose them in quotes (New-Object 'System.Int32' versus New-Object System.Int32 When writing functions and filters do you specify the types of parameters? Do you write cmdlets in the (official) correct case? For keywords like BEGIN...PROCESS...END do you write them in uppercase only? Thanks for any replies.

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• LINQ Style preference

  - by Erin

  I have come to use LINQ in my every day programming a lot. In fact, I rarely, if ever, use an explicit loop. I have, however, found that I don't use the SQL like syntax anymore. I just use the extension functions. So rather then saying: from x in y select datatransform where filter I use: x.Where(c => filter).Select(c => datatransform) Which style of LINQ do you prefer and what are others on your team are comfortable with?

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• Learning the GO programming language and its prospects [closed]

  - by SHOUBHIK BOSE

  Possible Duplicate: What are the chances of Google's Go becoming a mainstream language? Recently I've started experimenting with The GO programming language by Google. Its a programmer-friendly language having the simplicity of Python. I was wondering whether companies other than Google would also start using Go for development, and if they do , what would be the prospects of being a Go programmer?

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• Prefer algorithms to hand-written loops?

  - by FredOverflow

  Which of the following to you find more readable? The hand-written loop: for (std::vector<Foo>::const_iterator it = vec.begin(); it != vec.end(); ++it) { bar.process(*it); } Or the algorithm invocation: #include <algorithm> #include <functional> std::for_each(vec.begin(), vec.end(), std::bind1st(std::mem_fun_ref(&Bar::process), bar)); I wonder if std::for_each is really worth it, given such a simple example already requires so much code. What are your thoughts on this matter?

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• Is verification and validation part of testing process?

  - by user970696

  Based on many sources I do not believe the simple definition that aim of testing is to find as many bugs as possible - we test to ensure that it works or that it does not. E.g. followint are goals of testing form ISTQB: Determine that (software products) satisfy specified requirements ( I think its verificication) Demonstrate that (software products) are fit for purpose (I think that is validation) Detect defects I would agree that testing is verification, validation and defect detection. Is that correct?

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• Which is more valuable in product development: an action-oriented or visionary bent?

  - by Marc

  As a software development professional in a fairly conservative large-firm, I always had a much more action-oriented bent, as my job was fairly stable and all that mattered was doing as I was told and completing tasks that were germane to the career of a benevolent dictator (i.e., my boss' boss). Now that I'm no longer working for "the Man", I find it just as important to use the left side of my brain and wrap my head around this whole "vision thing". Which do you think is more important for software product development in a small, yet feisty start-up: Knowing the path or walking (or running) it?

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• I need advice on how to best handle an e-commerce situation

  - by Mohamad

  I recently moved to Brazil and started a small subscription based service company. The payment gateway market is under-developed in Brazil, and implementing a local solution is too expensive for me. My requirements are a payment gateway that will automatically process monthly recurrent billing, and that will allow me to manually charge my customers when needed. They would also have to deal with storage and security. I'm leaning towards manually processing payments myself as a restaurant would do, for example, using small swipe machines. Unfortunately, this would require me to store credit card information and I would rather not, but I feel it's my only option. Can anyone give me advice on how to tackle this problem? Do I have other options? If I decide to store credit card information, what should I keep in mind and how should I go about it? I have moderate skills in programming, and through tenacity I can get most things done. I'm afraid that this might be out of my league, however.

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• Is there a SUPPORTED way to run .NET 4.0 applications natively on a Mac?

  - by Dan

  What, if any, are the Microsoft supported options for running C#/.NET 4.0 code natively on the Mac? Yes, I know about Mono, but among other things, it lags Microsoft. And Silverlight only works in a web browser. A VMWare-type solution won't cut it either. Here's the subjective part (and might get this closed): is there any semi-authoritative answer to why Microsoft just doesn't support .NET on the Mac itself? It would seem like they could Silverlight and/or buy Mono and quickly be there. No need for native Visual Studio; cross-compiling and remote debugging is fine. The reason is that where I work there is a growing amount of Uncertainty about the future which is causing a lot more development to be done in C++ instead of C#; brand new projects are chosing to use C++. Nobody wants to tell management 18–24 months from now "sorry" should the Mac (or iPad) become a requirement. C++ is seen as the safer option, even if it (arguably) means a loss in productivity today.

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