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  • Try/Catch or test parameters

    - by Ondra Morský
    I was recently on a job interview and I was given a task to write simple method in C# to calculate when the trains meet. The code was simple mathematical equation. What I did was that I checked all the parameters on the beginning of the method to make sure, that the code will not fail. My question is: Is it better to check the parameters, or use try/catch? Here are my thoughts: Try/catch is shorter Try/catch will work always even if you forget about some condition Catch is slow in .NET Testing parameters is probably cleaner code (Exceptions should be exceptional) Testing parameters gives you more control over return values I would prefer testing parameters in methods longer than +/- 10 lines, but what do you think about using try/catch in simple methods just like this – i.e. return (a*b)/(c+d); There are many similar questions on stackexchnage, but I am interested in this particular scenario.

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  • test coverage reality

    - by iPhoneDeveloper
    I am NOT doing test driven development and I write my test classes after the actual code is written. In my current project I have a test coverage of(Line coverage) %70 for 3000 lines of Java code.(Using JUnit, Mockito and Sonar for testing) But while I feel actually I am not covering and catching %70 of the problems that can occur. So my question is in theory is that possible to have a %100 Line coverage but in reality it is meaningless because of low quality of the test code and maybe a %40 well written test code is much better than a bad %100 coverage? or we can always say line coverage more or less gives the percentage of all covered issues?

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  • Do I have to release the code of a MIT licensed software running a GPL library?

    - by Belohlavek
    Lets say I'm using Node-Webkit, an MIT licensed app runtime. Now, let's say I decide to include a Javascript library which is GPL licensed: while I do not modify the downloaded JS file, I do write my own code making use of the library's functions. I plan to sell the final obfuscated executable and I'm wondering: what's the final license of the complete software? Do I only have to release the GPL library or does the GPL license apply for all the code I wrote? What happens to Node-Webkit's MIT license?

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  • SOA Patterns book &ndash; your opinion needed

    It has been quite awhile since I added anything new to the book. I have my reasons (some would probably say excuses :) ) mainly that finding the energy and time to write is very hard with a wife, 3 kids and a startup. Anyway, Ive been talking with Manning lately trying to figure out what to do with this project. I was quite amazed to learn that 1000 or so of you purchased the MEAP edition even though it only contains 5 chapters and havent been updated in a long time....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Ubuntu 13.04 is showing some error while opening my computer

    - by Singh
    Few months before when I was using Ubuntu 12.04 then I found some errors while starting my computer. Due to this problem I had given my CPU to a shop to repair it I don't know what he has done to my CPU but I only know that finally I got my CPU with Ubuntu 13.04. The technician was unable to make any partition and I also think that he had installed 13.04 over 12.04 and so now my computer is showing some error when I'm starting my computer the error is as follows: error: attempt to read or write outside of the disk 'hd0'. grub rescue _ Before showing this error, few times my computer was working very slow. So kindly someone tell me that is there any way by which I can start my computer. Please also tell me that what things I have to keep in mind while using Ubuntu so that in future I find no difficulties(errors) while using Ubuntu.

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  • chmod - file permission on writable

    - by user1350338
    I am running Ubuntu 12.04 x64 server on ext4 partition. I set a directory's permission to '766' as below. sudo chmod 766 /archive drwxrw-rw- 3 root root 4096 Sep 27 10:50 archive/ <BR><BR><BR> But, when I tried to create new file through vi editor, permission error has occured. vi /archive/test.txt -------- > "/archive/test.txt" [Permission Denied] I thought I had "write" permission. Could anyone help me what is the problem?

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  • Developing instincts and "subconscious debugging" [closed]

    - by ggambett
    For some time now (a couple of years, perhaps?) I've noticed something that happens when I'm writing code. I write something with a syntax error, or some other subtle error. I don't really notice it on a conscious level, but I have a weird feeling about what I just wrote. I then try to compile it and I get a warning or error on the line that provoked the feeling. Lately I've been trying to pay attention to these feelings as they happen, and more often than not, I find errors right there. It's like I'm developing a subconscious debugger (or at least subconscious syntax checking ;)) I've heard of people fixing bugs in their sleep (I did a couple of times), but I don't think I've heard this kind of thing. Does it happen to someone else?

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  • Repeater vs. ListView

    - by MoezMousavi
    I do really hate repeater. I was more a GridView lover but after 3.5 be born, I prefer ListView.  The first problem with Repeater is paging. You will need to write code to handle paging. Second common problem is empty data template. Have a look at this:             if (rptMyRepeater.Items.Count < 1)             {                 if (e.Item.ItemType == ListItemType.Footer)                 {                     Label lblFooter = (Label)e.Item.FindControl("lblEmpty");                     lblFooter.Visible = true;                 }             }   I found the above code is usefull if you need to show something like "There is no record" is your data source has no records. Although the ListView has a template.   If you combine ListView with a DataPager, you will be in heaven as it is sorting the paging for you without writing code. (http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.datapager.aspx)     Note: You have got to bind ListView in PreRender, it doesn't work properly in PageLoad   More: http://www.4guysfromrolla.com/articles/061009-1.aspx

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  • how to bind super+s to indicator applete complete? - gnome classic

    - by rrosa
    i use gnome classic, i'm not a mouse fan. when i get an email while i'm writing code, i i would super+s to get to the indicator-applet-complete and read it. also to write emails, or check unread instant messages. upgrading from 12.04 to 14.04 made super+s bind to applications menu rather than the indicator applet complete. i removed the binding from the applications using dconf-editor, navigating to: org-gnome-desktop-wm-keybindings and disabling (['disabled']) the panel-main-menu key. now, how do i bind super+s to the indicator applet complete? it seems to be some how binded, since if if press super+s and then move the cursor over the applet it'll open the drop down menus (and it won't if i hover without pressing super+s) but i don't want to have to use the mouse...

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  • process monitoring in c under linux

    - by poly
    I'm trying to write a multi threaded/processes application and it need to know how to monitor a process from another process all the time. So here is what I have, I have a 2 processes, each with multiple threads that handle the network part, then another 2 process also with multiple threads that interact with DB and with the network processes, what I need to do is that if for example one of the network processes goes down the DB process start sending to the live network process until the second one is up again. I'm using fifo between the DB and the network process. I was thinking of sending messages with message passing all the time but not sure whether this is a good idea or I need to use some other IPC for this issue, or probably neither is good and I need to use entirely something else? Thanks,

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  • Is someone aware of any multi threaded unrar program?

    - by rsz
    I was searching in the past (past few weeks) for a program/software which is multithreaded and it is able to extract rarparts using multi threading. What software's i've already tried? unrar, unrar-nonfree, rar, 7zip It seemed to me that none of them is multi threaded and therefore they are all slow. The solution would be needed in cli format so if not necessary the no gui. Is someone aware of something like this? I asked on other irc's for suggestions and they told me, that the best is to write one myself. I may be agree with them, but i don't have these type of knowledge to achieve this task.

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  • Coming back from (blog) retirement

    - by leo.pasta
    So, it has been more than 3 years without a single blog post. I wished I could have a decent excuse for it, but in the end, I guess it boils down to laziness and procrastination. :-) Even though I learned a lot in that period (and added a feel tricks to my bag), I couldn’t find the will to sit down and write. I hope all my readers (yes mom and dad, I’m talking to you) have not been disappointed. I will try really hard not to let routine take over. I don’t expect I will be the most active blogger in the community, but hopefully a couple of posts per month is a good target to aim.

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  • Detect Subscribers To Event In Real Time

    - by xyz247
    I'm using C++ in the QT framework to write an application that detects an application running in memory. I can use the FindWindow method, but that requires that I know the windows title before hand. What would be the best method for identifying behavior of the application in memory to match it to a title? For example, if I know (before scanning) that a given application subscribes to the OnKeyPress event, is it possible to hook to it that method, detect all of the subscribers and enumerate them to find the application i'm looking for? If so, how would I go about doing that without integrating into the kernel? Thanks in advance for all the responses.

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  • Writing a spell checker similar to "did you mean"

    - by user888734
    I'm hoping to write a spellchecker for search queries in a web application - not unlike Google's "Did you mean?" The algorithm will be loosely based on this: http://catalog.ldc.upenn.edu/LDC2006T13 In short, it generates correction candidates and scores them on how often they appear (along with adjacent words in the search query) in an enormous dataset of known n-grams - Google Web 1T - which contains well over 1 billion 5-grams. I'm not using the Web 1T dataset, but building my n-gram sets from my own documents - about 200k docs, and I'm estimating tens or hundreds of millions of n-grams will be generated. This kind of process is pushing the limits of my understanding of basic computing performance - can I simply load my n-grams into memory in a hashtable or dictionary when the app starts? Is the only limiting factor the amount of memory on the machine? Or am I barking up the wrong tree? Perhaps putting all my n-grams in a graph database with some sort of tree query optimisation? Could that ever be fast enough?

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  • Quickly close all Word and Excel instances?

    - by dyenatha
    Suppose I open 10 Word files and 10 Excel files and make no changes, how do I quickly taskkill all at once? Because I must repeat several attempts to replicate race, I'm hoping for a command-line solution. I'm willing to try PowerShell and cygwin (1.5) if necessary. The OS is Windows XP SP3 with current patches (still IE7). I tried "taskkill /pid 1 /pid 2 /t" where 1 is PID of EXCEL.EXE and 2 is PID of WINWORD.EXE, but it closed only 1 window of each program. I'm trying to replicate a race where an add-in for Microsoft Office 2007 fails to exclusive-lock one of its own files, which caused the 2nd Office program to stop exiting with a warning: System.IO.IOException: The process cannot access the file 'C:\Documents and Settings\me\Application Data\ExpensiveProduct\Add-InForMicrosoftOffice\4.2\egcred' because it is being used by another process. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options) at System.IO.StreamWriter.CreateFile(String path, Boolean append) at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize) at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding) at System.IO.File.WriteAllText(String path, String contents, Encoding encoding) at ExpensiveProduct.EG.DataAccess.Credentials.CredentialManager.SaveUserTable() at ExpensiveProduct.OfficeAddin.OfficeAddinBase.Dispose(Boolean disposing) at ExpensiveProduct.OfficeAddin.WordAddin.Dispose(Boolean disposing) at ExpensiveProduct.OfficeAddin.OfficeAddinBase.OnHostShutdown() at ExpensiveProduct.OfficeAddin.OfficeAddinBase.Unload(ext_DisconnectMode mode)

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  • SEO Benefits of adding a Tumblr feed to site

    - by Paul
    A client of ours has a CMS driven Blog in his hotel site - he would like to use the blog to add depth top his site and add seo benefits relating to the blogs content. The current blog is a basic header / text field and doesn't contain any tagging / meta features. Unfortunately we dont have a .net developer in our team to alter the existing blog and add meta / tagging and there isn't budget to hire one - so I considered using a Tumblr blog - setting it up externally - giving it a blog.hotelname.com address and feeding it into the existing page via tumblrs js - which basically does a document.write into the page - which we can style. I understand from a previous post (Poor CMS blog vs Tumblr embed as a general rule most search engines ignore JS created content - but will the above approach act as an improvement on the existing system for now - as the blog will be setup externally with its own url and also feed into the existing site? Cheers Paul

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  • Avoiding null in a controller

    - by Kevin Burke
    I'm trying to work through how to write this code. def get(params): """ Fetch a user's details, or 404 """ user = User.fetch_by_id(params['id']) if not user: abort(404) # Render some template for the user... What's the best way to handle the case where the lookup fails? One principle says you should avoid returning null values from functions. These lead to mistakes and AttributeErrors etc. later on in the file. Another idea is to have fetch_by_id raise a ValueError or similar if no user exists with that id. However there's a general principle that you shouldn't use exceptions for control flow, either, which doesn't help much. What could be done better in this case?

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  • writing an autopilot for a 2d game with newtonian physics

    - by Jargo
    The subject says it all. I am making a 2d space game with newtonian physics and I need pointers on how to write an autopilot for it. The requirements are best explained by an example. There is a target object which has speed- and position-vectors and there a spaceship that is controlled by the autopilot. This spaceship also have speed, position and maximum acceleration. The autopilot needs to control the ship that it either collides with the target, Or intercepts the target so that the ship has matching speed and position with the target. Could someone give me some pointers how to achieve this behavior or perhaps even an ready implementation? I am sure someone has written something like this before and there is no point in reinventing the wheel.

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  • Problem with Using chntpw in Ubuntu to reset Windows 7 Password

    - by sandesh yadav
    I tried resetting the password of windows 7 Using 'chntpw' command in Ubuntu . It showed success . But when I try to login from Windows it does not seem to be changed. I first used live USB of ubuntu 11.10 and did ''Try Ubuntu''. Then I did sudo apt-get install chntpw and then cd /media/Vista/Windows/System32/config sudo chntpw -u username sam . I did according to this link . http://www.psychocats.net/ubuntucat/resetwindowspasswordold/ and got success like this. Hives that have changed: Name 0 Write hive files? (y/n) [n] : y 0 – OK . But when I try to login to windows with blank password , I could not login. I also tried changing the password and showed success but I could not login with that password . Thank you . Any help is very much appreciated.

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  • Unity3D or UDK or OPENGL from scratch?

    - by Legolas
    I am just very confused which I should choose in terms of high end game development. The application that I am designing is pretty simple, requires some 3D, and some effects. I am looking at a game similar to ping pong, but with high textures and graphics. I will just need web services to submit high scores. From my description, you can see that its pretty straight forward and I am confused whether I should use Unity3D or UDK or write the entire application myself with openGL (which will take a lot of time though). If you had faced this dilemma before, and chose for a particular graphics engine, please provide your suggestions and reasons as to why that was better. It would be helpful. Also, how can this affect in terms of investment and revenue ?

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  • How to make Evolution mail work with my work email address?

    - by Fady
    this is the 1st time to write here and the 1st time to use a mail client other than outlook. I tried to add my enterprise email address to evolution mail, I tried both server types exchange mapi and microsoft exchange. With exchange mapi i get this error message "Authentication failed. MapiLogonProvider: Failed to login into the server" With Microsoft Exchange I get this error "Could not connect to server . Make sure the URL is correct and try again." Although I'm sure of all the steps Server: ip address of the mail server Username: Domainname\Username Domain: domain name My system is Ubuntu Release 11.04 (natty) Kernel Linux 2.6.38-15-generic Genome 2.32.1 Evolution 2.32.2 Any kind of help is appreciated and thanks in advance

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  • Enabling and Disabling Colliders Unity

    - by Blue
    I'm trying to make the collider appear every 1 second. But I can't get the code write. I tried enabling the collider under a boolean and putting a yield to make it every second or so. But it's not working(gives me an error: Update() can not be a coroutine.). How would I fix this? Would I need a timer system and set the collider to be enabled every 'x' seconds and disabled every 'y' seconds? var waitTime : float = 1; var trigger : boolean = false; function Update () { if(!trigger){ collider.enabled = false; yield WaitForSeconds(waitTime); } if(trigger){ collider.enabled = true; yield WaitForSeconds(waitTime); } } }

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  • How often should saving to disk occur in an automatically saving text editor?

    - by lelandmiller
    I am developing a simple text editor and would like the application to save the text automatically. In other words, the user would never have to press a save button. I have seen other applications that do this, and was wondering how often is it safe to write files to disk? From a user experience standpoint, it seems that the more frequently this happens the better, but I am worried about performance and possible disk wear (especially on writes to SSDs). It seems like the operating system disk caching might help avoid these problems, but I also don't know if its safe to rely on that for an application like this. I was planning on writing the whole document to disk at each save, but this just seems terribly inefficient if the OS ends up writing it to disk to frequently, but relying on program unload may lose data in the case of a crash. Does anyone have any experience dealing with this that might be able to help?

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  • Finish long directory name with tab problem

    - by user1880405
    I have simple problem that I have to long directories which I want to cd into, but I would like to know easy way. mosquito@mosquito-K56CB:~/Downloads$ ls | grep Guns Guns n' Roses - Appetite for Destruction (Japanese Edition) 1987 Guns n' Roses - Use Your Illusion I 1991 Of course I can just copy the name and put it like this: cd "Guns n' Roses - Appetite for Destruction (Japanese Edition) 1987" But why when I write cd Guns then tab, it finishes line into: cd Guns\ n\'\ Roses\ -\ then by my understanding I should just start writing App.. with tab and it should finish whole name, but it does not. And hitting tab twice does not show me anything either. What I am missing here?

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  • What are the differences between Bigloo and ECL from an embedding standpoint? [migrated]

    - by Pubby
    I've been looking to embed Lisp in some C++ code. Two options I'm interested in is Bigloo Scheme and ECL (Common Lisp). Reading through the docs they seem to support a very similar feature set. Obviously Bigloo is Scheme and ECL is CLisp, but what other differences do they have? In particular I'm interested in the following criteria: Ease of embedding (for C++, not just C). I don't want to write a bunch of boilerplate. Performance. Bigloo is performance based and has many compiler optimization options, although I can't find anything comparable for ECL. Style of coding. This one is more for Bigloo - is it more functional than ECL? I'm targeting this question towards someone who has used both.

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