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• software engineer self improvment [closed]

  - by radi

  hi all , i am a 4th year student at software engineering department , at my faculty we study software engineering basics (unified process , uml , design patterns ) , so : what about these technics ? do i need to learn another (or new such as agile) ? what about programming languages (frameworks) ? what i need to learn ? why ? thanks

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• Associated models in Rails?

  - by dannymcc

  Hi Everyone, In my rails application I have two models called Kases and Notes. They work in the same way comments do with blog posts, I.e. each Kase entry can have multiple notes attached to it. I have got everything working, but for some reason I cannot get the destroy link to work for the Notes. I think I am overlooking something that is different with associated models to standard models. Notes Controller class NotesController < ApplicationController # POST /notes # POST /notes.xml def create @kase = Kase.find(params[:kase_id]) @note = @kase.notes.create!(params[:note]) respond_to do |format| format.html { redirect_to @kase } format.js end end end Kase Model class Kase < ActiveRecord::Base validates_presence_of :jobno has_many :notes Note Model class Note < ActiveRecord::Base belongs_to :kase end In the Kase show view I call a partial within /notes called _notes.html.erb: Kase Show View <div id="notes"> <h2>Notes</h2> <%= render :partial => @kase.notes %> <% form_for [@kase, Note.new] do |f| %> <p> <h3>Add a new note</h3> <%= f.text_field :body %><%= f.submit "Add Note" %> </p> <% end %> </div> /notes/_note.html.erb <% div_for note do %> <div id="sub-notes"> <p> <%= h(note.body) %><br /> <span style="font-size:smaller">Created <%= time_ago_in_words(note.created_at) %> ago on <%= note.created_at %></span> </p> <%= link_to "Remove Note", kase_path(@kase), :confirm => 'Are you sure?', :method => :delete, :class => 'important' %> </div> <% end %> As you can see, I have a Remove Note destroy link, but that destroys the entire Kase the note is associated with. How do I make the destroy link remove only the note? <%= link_to "Remove Note", kase_path(@kase), :confirm => 'Are you sure?', :method => :delete, :class => 'important' %> Any help would, as always, be greatly appreciated! Thanks, Danny

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• Recursion with an Array; can't get the right value to return

  - by Matt

  Recursive Solution: Not working! Explanation: An integer, time, is passed into the function. It's then used to provide an end to the FOR statement (counter<time). The IF section (time == 0) provides a base case where the recursion should terminate, returning 0. The ELSE section is where the recursive call occurs: total is a private variable defined in the header file, elsewhere. It's initialized to 0 in a constructor, elsewhere. The function calls itself, recursively, adding productsAndSales[time-1][0] to total, again, and again, until the base call. Then the total is returned, and printed out later. Well, that's what I hoped for anyway. What I imagined would happen is that I would add up all the values in this one column of the array and the value would get returned, and printed out. Instead if returns 0. If I set the IF section to "return 1", I noticed that it returns powers of 2, for whatever value time is. EG: Time = 3, it returns 2*2 + 1. If time = 5, it returns 2*2*2*2 + 1. I don't understand why it's not returning the value I'm expecting. int CompanySales::calcTotals( int time ) { cout << setw( 4 ); if ( time == 0 ) { return 0; } else { return total += calcTotals( productsAndSales[ time-1 ][ 0 ]); } } Iterative Solution: Working! Explanation: An integer, time, is passed into the function. It's then used to provide an end to the FOR statement (counter<time). The FOR statement cycles through an array, adding all of the values in one column together. The value is then returned (and elsewhere in the program, printed out). Works perfectly. int CompanySales::calcTotals( int time ) { int total = 0; cout << setw( 4 ); for ( int counter = 0; counter < time; counter++ ) { total += productsAndSales[counter][0]; } return total0; }

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• Literature and Tutorials for Writing a Ray Tracer

  - by grrussel

  I am interested in finding recommendations on books on writing a raytracer, simple and clear implementations of ray tracing that can be seen on the web, and online resources on introductory raytracing. Ideally, the approach would be incremental and tutorial in style, and explain both the programming techniques and underyling mathematics, starting from the basics.

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• App dies on startup but not crash report

  - by brettr

  I've given an ad hoc version of my app to some users. Two of them have the app die on start up while one user has no issues. I can also install the ad hoc without issue...but that is always the case for me. One user sent the info below from the Xcode Organizer Console. They didn't find any crash logs. I don't know what to make of the info below. The one thing that stands out is "Permission denied". I place the provisioning and myapp.app files in a dropbox folder. The user then retrieves the files from the same location. I've run codesign against the .app file in the dropbox and get valid output: codesign -vvvv myapp.app myapp.app: valid on disk myapp.app: satisfies its Designated Requirement Any one have some ideas how I can figure out why the app doesn't work for this user? Here is the Console output from one user. They couldn't find any associated crash logs: Stats totalMLSITDBPostProcessing=5.31s commands=0.01 misc=0.45s icuSort=4.41s (MLS_icu_data=0.23s, MLS_icu_sec_data=0.13, dropIdx=0.04, normalize=0.13, update_orders=1.31, tStatsICUOther1=0.02, createIndex=2.50) Sun Dec 13 12:35:04 unknown com.apple.launchd[1] <Error>: (UIKitApplication:com.cygen.myapp[0x8cb6]) posix_spawn("/var/mobile/Applications/4B036396-3294-4E0A-BBCC-4118E72846D4/myapp.app/myapp", ...): Permission denied Sun Dec 13 12:35:04 unknown com.apple.launchd[1] <Warning>: (UIKitApplication:com.cygen.myapp[0x8cb6]) Exited with exit code: 1 Sun Dec 13 12:35:04 unknown SpringBoard[24] <Warning>: Failed to spawn myapp. Unable to obtain a task name port right for pid 179: (os/kern) failure Sun Dec 13 12:35:04 unknown com.apple.launchd[1] <Warning>: (UIKitApplication:com.cygen.myapp[0x8cb6]) Throttling respawn: Will start in 2147483647 seconds Sun Dec 13 12:35:04 unknown SpringBoard[24] <Warning>: Application 'myapp' exited abnormally with exit status 1 Sun Dec 13 12:35:10 unknown springboardservicesrelay[155] <Warning>: Unable to parse property list data of length: 0 Sun Dec 13 12:35:13 unknown com.apple.launchd[1] <Error>: (UIKitApplication:com.cygen.myapp[0x3ce5]) posix_spawn("/var/mobile/Applications/4B036396-3294-4E0A-BBCC-4118E72846D4/myapp.app/myapp", ...): Permission denied Sun Dec 13 12:35:13 unknown com.apple.launchd[1] <Warning>: (UIKitApplication:com.cygen.myapp[0x3ce5]) Exited with exit code: 1 Sun Dec 13 12:35:13 unknown SpringBoard[24] <Warning>: Failed to spawn myapp. Unable to obtain a task name port right for pid 182: (os/kern) failure Sun Dec 13 12:35:13 unknown com.apple.launchd[1] <Warning>: (UIKitApplication:com.cygen.myapp[0x3ce5]) Throttling respawn: Will start in 2147483647 seconds Sun Dec 13 12:35:13 unknown SpringBoard[24] <Warning>: Application 'myapp' exited abnormally with exit status 1

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• Implementing dynamic scope when using CPS as intermediate language

  - by asandroq

  I am currently studying the implementation of programming languages and became interested in using Continuation-Passing Style as the intermediate language of the compiler. I also want to implement limited dynamic scope (for exception-handling or Scheme parameter objects) but I cannot find the relevant literature. I think it can be done with a separate environment passed as a variable to every closure, but this solution seems ugly to me. Could anyone point me to the relevant literature, or give me an idea of how this can be done?

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• Encode mail as quoted-printable before sending in Rails

  - by macek

  I saw this question and couldn't make use of it: http://stackoverflow.com/questions/1034135/ruby-email-encoding-and-quoted-printable-content My email is going out as unencoded text/html. Any help? class UserMailer < ActionMailer::Base def welcome_mail(user) recipients user.email from "[email protected]" subject "Thanks for registering" body :user => user end end

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• starting with android

  - by Woland

  I am considering to start writing apps for android. Could some-one post list with all tools needed to start coding. My programming skills by language are C# - excellent Java - moderate c/c++ - beginner I have heard something about Mono for android, whats the status of it? is it any good? Also it would be helpful to hear how Java performs on android. Any other points and issues regarding the android platform are also welcomed.

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• Most valuable course in the CS degree.

  - by danielrutledge

  I was a math major and I took OOP and Algorithms & Data Structures from the CS department while in school, but didn't continue to any upper-division courses. What were the most valuable courses to your programming career (Operating systems, Compiler Design, Computer architecture, etc) in your CS degree? Alternatively, if you're like me and don't have one, are there any courses you wish you had taken? What would be the best way to fill in the gaps in my knowledge outside of school?

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• How to change the class of an object dynamically in C#?

  - by codemonkie

  Suppose I have a base class named Visitor, and it has 2 subclass Subscriber and NonSubscriber. At first a visitor is start off from a NonSubscriber, i.e. NonSubscriber mary = new NonSubscriber(); Then later on this "mary" subscribed to some services, and I want to change the type of "mary" to Subscriber. What is the conventional way to do that?

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• a good smart phone for java development?

  - by pstanton

  Hi all, I'd like to do some development of smart phone apps and my native programming language is java. The first application I'd like to write will need to be able to (attempt to) connect to a network (LAN or WiFi) automatically in the background (on a schedule). would an android phone be the best path or are there competitive purer java options?

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• How to register file types/extensions with a WiX installer?

  - by OregonGhost

  I didn't find an explicit answer to this question in the WiX Documentation (or Google, for that matter). Of course I could just write the appropriate registry keys in HKCR, but it makes me feel dirty and I'd expect this to be a standard task which should have a nice default solution. For bonus points, I'd like to know how to make it "safe", i.e. don't overwrite existing registrations for the file type and remove the registration on uninstall only if it has been registered during installation and is unchanged.

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• arduino emacs development

  - by aaa

  hi. I would like to use emacs as a development environment for arduino programming. If you use emacs to program arduino, can you share some tips or links which you find useful. Is there official (or de facto) emacs mode? Also, am I going to miss something which is in arduino IDE if I use emacs exclusively? thank you .

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• Can I disable the cursor change to hour glass when invoke TTaskDialog.Execute?

  - by Chau Chee Yang

  Hi, I am using Dialog 2010 and Windows 7. When I invoke TTaskDialog.Execute method, there is a short flash of screen cursor change to hour glass. Is there any way to get rid of it? As it doesn't have much meaning for a simple task dialog but causing some delay to wait for the dialog prompt out.

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• Java code for disabling the usb drive

  - by Navin

  I Want to know how to disable the usb drives through java programming,Can any one give the code for this or tell me the exact way to do this.............

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• siftware to manage applications within business.

  - by Richard Friend

  Hi I have been tasked to either find an off the shelf solution or to build inhouse some software that can maintain a list of all of the applications within our business, assign them to the different business areas that use them and list all the servers, documents, knowledge base etc that relate to the app in question. Does anyone know of any existing software that can do this ? Regards

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• Telelogic Synergy equivalent of svn blame?

  - by Dan Vinton

  Is there an equivalent in Synergy to the blame command in Subversion? I'd like to be able to see, for a given version of a file, the originating change request or task for each line of that file. I'm using Synergy version 6.5.4105.

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• Python - create blacklist file of IP addresses that have more than 5 failed login attempts in the au

  - by oz_babe

  Basically I have an authlog/syslog file with a list of log in attempts and IP addresses - I need to make a Python program that will create a txt file with all the IP addresses that have more than 5 failed login attempts - a sort of "blacklist". So basically something like: if "uniqueipaddress" and "authentication failure" appear more than 5 times, add uniqueipaddress to txt file. Any help would be greatly appreciated - please try and make it simple as I am very, very inexperienced in programming in Python! Thanks.

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• Rails3 UJS example with unobtrusive dry flash error

  - by user142913

  Hi to everybody thislink text is a demo "done right" about rails3 and UJS, but if you add: validates :name, :presence = true to the Task model that error(500 Internal Server Error) is displayed nowhere. Do you know a correct and clean way to handle it?

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• How do I destruct data associated with an object after the object no longer exists?

  - by Phineas

  I'm creating a class (say, C) that associates data (say, D) with an object (say, O). When O is destructed, O will notify C that it soon will no longer exist :( ... Later, when C feels it is the right time, C will let go of what belonged to O, namely D. If D can be any type of object, what's the best way for C to be able to execute "delete D;"? And what if D is an array of objects? My solution is to have D derive from a base class that C has knowledge of. When the time comes, C calls delete on a pointer to the base class. I've also considered storing void pointers and calling delete, but I found out that's undefined behavior and doesn't call D's destructor. I considered that templates could be a novel solution, but I couldn't work that idea out. Here's what I have so far for C, minus some details: // This class is C in the above description. There may be many instances of C. class Context { public: // D will inherit from this class class Data { public: virtual ~Data() {} }; Context(); ~Context(); // Associates an owner (O) with its data (D) void add(const void* owner, Data* data); // O calls this when he knows its the end (O's destructor). // All instances of C are now aware that O is gone and its time to get rid // of all associated instances of D. static void purge (const void* owner); // This is called periodically in the application. It checks whether // O has called purge, and calls "delete D;" void refresh(); // Side note: sometimes O needs access to D Data *get (const void *owner); private: // Used for mapping owners (O) to data (D) std::map _data; }; // Here's an example of O class Mesh { public: ~Mesh() { Context::purge(this); } void init(Context& c) const { Data* data = new Data; // GL initialization here c.add(this, new Data); } void render(Context& c) const { Data* data = c.get(this); } private: // And here's an example of D struct Data : public Context::Data { ~Data() { glDeleteBuffers(1, &vbo); glDeleteTextures(1, &texture); } GLint vbo; GLint texture; }; }; P.S. If you're familiar with computer graphics and VR, I'm creating a class that separates an object's per-context data (e.g. OpenGL VBO IDs) from its per-application data (e.g. an array of vertices) and frees the per-context data at the appropriate time (when the matching rendering context is current).

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• tokens in visual studio: HACK, TODO... any other?

  - by b0x0rz

  what tokens do you find useful in visual studio? (visual studio 2010 ? environment ? task list ? tokens) currently i have only: HACK - low REVIEW - high TODO - normal WTF - high (only these - deleted some default ones) are you using any others? are you covering any other important thing with comment tokens? any best practices? thnx

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• a page that show as showModalDialog don't return value.

  - by Navid Farhadi

  I have a page that i want to show it modally by returnval = window.showModalDialog(pagename, winArgs, winSettings); When page postback internet explorer opens a new page so i use below code in page's HEAD <base target=_self> and now it don't return value. It work in firefox and don't work in ie and chrome.

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• Hidden features of Ruby

  - by squadette

  Continuing the "Hidden features of ..." meme, let's share the lesser-known but useful features of Ruby programming language. Try to limit this discussion with core Ruby, without any Ruby on Rails stuff. See also: Hidden features of C# Hidden features of Java Hidden features of JavaScript Hidden features of Ruby on Rails (Please, just one hidden feature per answer.) Thank you

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• how to write MPEG4 video files from stream in vc++ directshow

  - by maxy

  hai all... Am writing simple application for capturing video from camera and save in .WMV files using vc++ Directshow.i done this task.bt i need to write file as MPEG4 file type. can anyone help me. CAMERA---->SAMPLEGRABBER---->getting streams from sample graaper.. i get stream from camera like this. kndly help me thanks

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• long vs. short branches in version control

  - by Vincenzo

  I wonder whether anyone knows some research done with the question "What is good/bad in long/short branches in version control?" I'm specifically interested in academic researches performed in this field. My questions are: What problems (or conflicts) long branches may produce and how to deal with them How to split a big task onto smaller branches/sub-tasks How to coordinate the changes in multiple short branches, related to the same code Thanks in advance for links and suggestions!

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