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• Property and Encapsulation

  - by Lijo

  Hi Team, Following is a question regarding using Properties in class. I am software engineer with 3 years of experience. I have been using public properties instead of exposing member variables publically. Many a people told that this approach helps in encapsulation. I don’t realize any encapsulation advantage by making it a property. While discussions, I came to know that not many people knows about the real reason for going for Property. They just do it as part of coding standard. Can someone clearly explain how Property is better than public member variable? How it improves encapsulation? Thanks Lijo

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• Select_related() backwards relation - auto model population

  - by Nick

  Hi. If I have the following model: class Contact(models.Model) name = models.CharField(max_length=100) ... class ContactAddress(models.Model) line1 = models.CharField(max_length=100) line2 = models.CharField(max_length=100) ... contact = models.ForeignKey(Contact) I now want to grab all Contacts and for the address to be auto populated. What would be the best way to do this? The only way I have found so far is to filter out the Contacts I want and loop around each contact and assign this to Contact.addresses. I then use this for outputting each Contacts address within a template. Is there a better way of doing this? Select_related() almost does what I want, but doesn't seem to be able to work in the opposite direction. Thanks in advance for your help on this one!

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• should a student be diversifying or mastering programming languages?

  - by Max Link

  As the question states, is it better if a student diversifies or explores when learning programming languages or should they focus only on 2-3 languages and really get to know them well? Example of what I mean by diversifying: Functional -> Scheme Procedural -> C Object Oriented -> Java Dynamic or scripting -> Python Other -> C++ I have a few breaks in between semesters sometimes (up to 3 months) and I'm thinking of either learning a new language or "master" those that I know right now. Which would benefit me in the future? I know some(about 3 months of self studying each) Java, C, and C++ already . If I'm not mistaken, where I live, the industry is heavy on Java, C++, and C#.

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• How to make socket.recv(500) not stop a while loop.

  - by ImTooStupidForThis

  I made an IRC bot which uses a while true loop to receive whatever is said. To receive I use recv(500), but that stops the loop if there isn't anything to receive, but i need the loop to continue even if there isn't anything to receive. I need a makeshift timer to continue running. Example code: /A lot of stuff/ timer=0 while 1: timer=timer+1 line=s.recv(500) #If there is nothing to receive, the loop and thus the timer stop. /A lot of stuff/ So either I need a way to stop it stopping the loop, or I need a better timer.

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• SQLite Queries for dates

  - by user2909616

  I have a SQLite data base which I am pulling data for a specific set of dates (lets say 01-01-2011 to 01-01-2011). What is the best way to implement this query into SQL. Ideally I would like the following line to run: SELECT * FROM database where start_date < date_stamp and end_date date_stamp This obviously does not work when I store the dates as strings. My solution (which I think is messy and I am hoping for another one) is to convert the dates into integers in the following format: YYYYMMDD Which makes the above line able to run (theoretically). IS there a better method? Using python sqlite3 Would the answer be any different if I were using SQL not SQLite

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• As2 loading swf instance

  - by user1748474

  I have a .swf which loads an external .swf: this.createEmptyMovieClip("container_mc", this.getNextHighestDepth()); var my_listener:Object = new Object(); my_listener.onLoadComplete = function(target_mc:MovieClip) { target_mc._x = 50; target_mc._y = 50; addChild(my_loader); var blocker = my_loader.content.test blocker._visible = false; } my_listener.onLoadProgress = function(target_mc:MovieClip) { trace(target_mc.getBytesLoaded() + " out of " + target_mc.getBytesTotal()); } var my_loader:MovieClipLoader = new MovieClipLoader(); my_loader.addListener(my_listener); my_loader.loadClip("child_as2.swf", container_mc); I want to acces the external swf and make the movieclip with instance name test visible = false; but it won't work. I have tried a lot of codes and right now it throws me this error: Scene=Escena 1, layer=Capa 1, frame=1, Line 9 There is no property with the name 'content'. Any idea? If you have a better code i will thank you so much.

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• Calculating number of online visitors?

  - by Syom

  i need to show the number of online visitors, but there is a problem with selecting algoritm to do it! maybe i must create a table in DB, where i'll store ip addresses of visitors and time of visit! by so i can show the count of ip addresses, which's time = NOW() - 10 minutes, for example...("now()-10 minutes" is just to show the logic, i know that this is not a function:) is this goog way to go? or maybe it's better to use AJAX methods to store the data? please give me an idea. Thanks

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• Is it easier to create a chat client using java or PHP?

  - by Mendy

  first off, my goal: Create a chat client that requires the user to log in with a password. Would it be easier to create it with just HTML an PHP or java? EDIT: Sorry, I didn't mention. I have some experience in javascript. I'm afraid that is all. I could and would learn another language. So I want to know which language would be better to learn for this project? also, for the username and password login I'm guessing I would need some mySQL knowledge? Thanks.

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• Best way to get the values of a hash ordered by their respective keys? (Ruby)

  - by they changed my name

  Here's what I'm doing atm: test = { 'd' => 20, 'b' => 40, 'c' => 30, 'a' => 10, 'e' => 50 } f = [] test.to_a.each do |e| f << e[1] end puts f.sort.join(' ') Outputs: 10 20 30 40 50 Is there a more efficient/concise/better way to do this? And before someone says so, no, I can't use an array. :p

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• How do submit an object to a struts2 action using jQuery?

  - by James Drinkard

  I have an object that I'm populating from a selection off a table row that a user selects. I have a jQuery function that captures the click event and a hidden form field populates an id I need. However, I'm not sure as to the proper way to send off that object to a struts2 action? I tried using this: $(function() { $('#tbl tr').click(function() { var id = $(this).closest('tr').find('input:hidden').val(); var page = "<s:url action='update/deleteInfo.action'/>?model.isDelete=true&model.info.id=id"; console.log(page); window.location.href=(page); }); }); The model object has an isDelete boolean variable and the model has a nested info object that has an id variable with getter/setters. However, when I send this across, the model object isn't populated with these entries. Is there a way to do this or a better way than the url tag?

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• Should I include locally or remotely?

  - by Rob

  Just something I wonder about when including files: Say I want to include a file, or link to it. Should I just for example: include("../localfile.php"); or should I instead use include("http://sameserver.com/but/adirect/linkto/localfile.php"); Is one better than the other? Or more secure? Or is it just personal preference? Clearly it would be a necessity if you had a file that you would include into files in multiple directories, and THAT file includes a different file, or is there some other way of doing that?

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• Is it faster to count down that it is to count up?

  - by Bob

  Our computer science teacher once said that for some reason it is more efficient to count down that count up. For example if you need to use a FOR loop and the loop index is not used somewhere (like printing a line of N * to the screen) I mean that code like this : for (i=N; i>=0; i--) putchar('*'); is better than: for (i=0; i<N; i++) putchar('*'); Is it really true? and if so does anyone know why?

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• How to determinate file in Perl

  - by rodnower

  Hello, I use File::Find - find(\&f, $directory) for find some file with some content. Relevant part of my delegate looks like: sub f { my $file = $File::Find::name; return unless -f $file; return unless $file =~ /$file_pattern/; etc... but the problem is that, that this code returns every time where $file not exist in current directory. For example for file ./test it fine, but for file ./dir/test this return... Is there some better way to know if $file is file?

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• Saving variables (not sessions)

  - by james.bcn

  This may be a silly question, but how do I save variables that are not specific to a particular session. An simple example of why you might want to do this would be a visitor counter - a number that increases by one each time someone visits a web page (note - I'm not actually doing that, my application is different, but that is the functionality I need). The only ways I can think of doing this are either writing the variables to a file, or putting the variables into a database. Both seem a bit inelegant. Is there a better way to to this kind of thing?

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• Select photo while keep the order

  - by wong2

  I have a list of photo on the page, each have an unique id, user can click on them to toggle select the photo, when they click the submit button, I need to send the array of selected photo ids to the back end, in the order that the photo was selected. I think that the fastest way to track if a photo is selected is to use an object that use photo id as key, like: var selected = { "6272861": true, "6272888": true } when the user unselect a photo, I just need to delete selected["6272861"]. But this will ignore the order, if I use an array to keep the selected photos: var selected = ["6272861", "6272888"]; then when I need to unselect a photo, I have to loop through the array and delete the item. Is there better ways? thanks.

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• WCF: Is there a way to return an object that is able to execute on the server?

  - by mafutrct

  Coming from a Java background, this is the way I'm thinking: The server provides an object to the client. This object should be able to execute on the server. Server: private string _S = "A"; public interface IFoo { void Bar(); } private class Foo : IFoo { void Bar() { _S = "B";} } public IFoo GetFoo() { return new Foo(); } Client: IFoo foo = serverChannel.GetFoo(); foo.Bar(); Is this possible? Or is my understanding wrong and this is not how it works in WCF? What would be a better design?

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• Desired features for C++

  - by bytepusher

  I am a full time C++ developer, and I really like the language. I think it is suited for almost any kind of application. Some people claim Java and C# are better suited for high level programming, but I'm not so sure about this. I have worked with all three languages, and when using C++, it happens only now and then I come across something that might be improved. What features would you like to see added to C++? I'm talking about big improvements, not details like typesafe enums.

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• C# Improved algorithm

  - by generixs

  I have been asked at interview (C# 3.0) to provide a logic to remove a list of items from a list. I responded int[] items={1,2,3,4}; List<int> newList = new List<int>() { 1, 2, 3, 4, 5, 56, 788, 9 }; newList.RemoveAll((int i) => { return items.Contains(i); }); 1) The interviewer replied that the algorithm i had employed will gradually take time if the items grow and asked me to give even better and faster one.What would be the efficient algorithm ? 2) How can i achieve the same using LINQ? 3) He asked me to provide an example for Two-Way-Closure? (General I am aware of closure, what is Two-Way-Closure?, I replied there is no such term exists,but he did not satisfy).

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• Windows Search in Taskbar with my own results

  - by masterchris_99

  Hello, I want to provide a custom Search Connector for Windows Search without accessing a php or aspx website. Is this possible? I don't find anything. It is not possible to create tmp files because of the amount of files. I want to do a db query. Target: .net (C#) Here are 2 pics for a better explanation. What I have What I want the 3 source of information come from a external source via database query. regards Chris

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• C#: Using as bool? instead of object something = ViewState["hi"]

  - by Programmin Tool

  So I'm going through old code (2.0) and I came across this: object isReviewingValue = ViewState["IsReviewing"]; if (isReviewingValue is bool) { return (bool)isReviewingValue; } My first thought was to us the "as" keyword to avoid the unneeded (bool)isReviewingValue; But "as" only works with non value types. No problem, I just went ahead and did this: bool? isReviewingValue= ViewState["IsReviewing"] as bool?; if (isReviewingValue.HasValue) { return isReviewingValue.Value; } Question is: Besides looking a bit more readable, is this in fact better?

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• What code commenting style should I use for both C++ and C# ?

  - by ereOn

  Hi, I was recently hired in a company. They have a lot of C++ and C# code source files and almost one different commenting style per file. (Well this is exagerated, but you have the picture) This morning, I show my new collegues how my personnal code was commented and how easy it was to generate a documentation from it (I use Doxygen). I somehow convinced them to use a coherent commenting style. I would suggest using Doxygen for C++ source files and native C# style commenting style for C# files. However, I'm not sure that's the best solution here. Are you aware of a commenting style that would work for both C++ and C# allowing us to generate a documentation from it ? If so, what software/tool should we use ? Having a solution that would work on Linux platforms as well would be even better. Thank you very much.

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• Removing control / special characters from log file

  - by digitalsky

  I have a log file captured by tclsh which captures all the backspace characters (ctrl-H, shows up as "^H") and color-setting sequences (eg. ^[[32m .... ^[[0m ). What is an efficient way to remove them? ^[...m This one is easy since, I can just do "sed -i /^[.*m//g" to remove them ^H Right now I have "sed -i s/.^H//", which "applies" a backspace, but I have to keep looping this until there are no more backspaces. while [ logfile == `grep -l ^H logfile` ]; do sed -i s/.^H// logfile ; done; "sed -i s/.^H//g" doesn't work because it would match consecutive backspaces. This process takes 11 mins for my log file with ~6k lines, which is too long. Any better ways to remove the backspace?

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• Is it possible in Java to implement something similar to Object.clone() ?

  - by devoured elysium

  The Object.clone() method in Java is pretty special, as instead of returning a copy of the object that is to be cloned with the Object type, it returns the correct Object type. This can be better described with the following code: class A extends Object { public A clone() { return super.clone(); //although Object.clone() is from the Object class //this super.clone() will return an A object! } } class B extends A { } public static void main(String[] args) { B = new B(); B.clone();//here, although we haven't defined a clone() method, the cloned //object return is of type B! } So, could anyone explain if possible if is there anyway to replicate what happens inside Object.clone()'s method?

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• C# design question (Connections)

  - by David

  Hello, I would like to hear your suggestions on kind of design problem which I have in c#. So, I am making a program where people can meet and draw in the same window over the internet or LAN. I am drawing into a bitmap and than I set it to a pictureBox component. I have a hard time to decide how to send updates to each user, what is the best way to do it. Should I send coordinates of mouse and than do the drawing on each users screen or stream the image to each. Maybe you know better solution to keep it synchronized and efficient. Thank you.

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• Example code of select display area images

  - by Sarawut Positwinyu

  Trying to make a better question There are a lot of images on different width and height, what i want to do is to resize those image to a certain size and shop image on the croppea area to have every image on the same size. is there any way to archived this. This website his the example of select display images area by jquery here but i can't find the example code of how to do this. what is the example code to display only selected area of images on javascript. http://odyniec.net/projects/imgareaselect/

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