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• Programming terms - field, member, properties (C#)

  - by Petr

  Hi, I was trying to find meaning of this terms but especially due to language barrier I was not able to understand what they are used for. I assume that "field" is variable (object too?) in the class while "property" is just an object that returns specific value and cannot contain methods etc. By "member" I understand any object that is declared on the class level. But these are just my assumptions based on commented code samples where some careful programmers used "property region" etc. I would really appreciate if someone could explain it to me.

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• C++ struct sorting error

  - by Betamoo

  I am trying to sort a vector of custom struct in C++ struct Book{ public:int H,W,V,i; }; with a simple functor class CompareHeight { public: int operator() (Book lhs,Book rhs) { return lhs.H-rhs.H; } }; when trying : vector<Book> books(X); ..... sort(books.begin(),books.end(), CompareHeight()); it gives me exception "invalid operator <" What is the meaning of this error? Thanks

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• do people value information or aesthetic value of websites ? [closed]

  - by fwfwfw

  I'm thinking, why does the web have to be so colorful. meaning, all the information is buried deep beneath layers of flash, javascripts, html and images. Sure, a good positioning of these media files, create an aesthetic value but how important is it to the user ? moreover, aren't people looking for information after all ? why can't the internet be a uniform looking data warehouse ? now we've gotta digg through all the aesthetic junk, using shady web scraping techniques, unless RSS or API is provided. why can't we settle for just a dull grey button and framesets for navigation ? why can't all sites have navigation frame on the left and top ? why can't all sites put their damn data always in normalized table tag ?

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• Google Chrome window.open height includes URL bar

  - by andyjeffries

  When we open a window using: window.open("/calendar",'calendar','width=950,height=576,titlebar=no,statusbar=no,menubar=no,resizable=no,scrollbars=no'); Firefox 3 and IE 7 open it to have a content area height of 576 plus the browser items (URL bar, status bar, etc). Chrome however opens it to have a total height of 576 meaning a scrollbar appears to the right of the content (and then the bottom because the width is now reduced). How can I get around this? It's for a heavy layout part of a web app so it's not just a matter of "let the user scroll", the client doesn't want that. Has anyone come across this? I don't mind browser sniffing and opening the window bigger, but I know that's yucky these days.

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• is there a good reason to fear closed-source code *inside* of open-source libraries?

  - by jcollum

  Here's the situation. At work here, I hear there is resistance to using open source code (Nant in particular) because there might be copyrighted code in there. Meaning somewhere in that open source tool or library there might be a chunk of code that was directly lifted from copyrighted code. In theory, this means our company (which is quite large) get sued for big money because they used an open source library. We don't ship any software, so how this theoretical plaintiff would find this out is a mystery. I have also heard that some group of people came through a year or two ago and actually found instances of this in our codebase. That's hearsay of course, so who knows. Is this simple paranoia? Didn't something similar to this happen with Linux a while ago? Wouldn't the burden of checking for copyrighted code lie with the people who made the code, not the people who use it?

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• extracting multiple fields from a text file using php

  - by Dave

  Hi, what is the best way of extracting multiple (~40 values) from a text file using php? the data is more or less like: NAMEA valuea NAMEB valueb I'm looking for a proper* approach to extracting this data into a data-structure, because i will need to specify regexs for all of them (all 40). did i make myself clear? *meaning, the default/painful method would be for me to do: $namea = extractfunction("regexa", $textfilevalue); $nameb = extractfunction("regeb", $textfilevalue); ... 40 times!

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• Using "Go To Controller" and "Go To View" in Visual Studio 2008 when controllers are in different as

  - by ElvisLives

  The title is basically the question. We decided to move our controller classes to a separate library and reference it in our asp.net mvc 2 application. It works just fine when running the application, meaning the controllers are being referenced while the application is running. But when doing development (in Visual Studio 2008) and I am in a View and try to use the context menu "Go To Controller" it can't find our controllers in the new assembly. Same with when I am inside a controller, I don't have the Context menu to "Add View" or "Go To View" anymore. Does anyone one know how to remedy this? I searched like crazy but haven't found any solutions or even half solutions. Thanks!

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• Possibly simple PHP/MYSQL issue with retrieving and showing data

  - by envoys

  I have been racking my brains over this for a while now. Here is the data i have in the sql data base as an example: ID | TYPE | DATA 1 | TXT | TEST 2 | PHP | php 3 | JS | JAVASCRIPT That is just an example, there are multiple listing for TXT, PHP and JS throughout the table. What I want to do is retrive all the data and display it all into separate drop down/select boxes. Meaning, select box one would list all data with type TXT, select box two would list all data with type PHP and select box 3 would list all data with type JS. The only way I have came about doing this is doing individual sql queries for each different type. I know there is a way to do it all in 1 query and then display it the way I want to but I just can't seem to figure out how and I know its going to drive me nuts when someone helps and I see just how they did it. Thanks for the input.

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• Improve SQL query performance

  - by Anax

  I have three tables where I store actual person data (person), teams (team) and entries (athlete). The schema of the three tables is: In each team there might be two or more athletes. I'm trying to create a query to produce the most frequent pairs, meaning people who play in teams of two. I came up with the following query: SELECT p1.surname, p1.name, p2.surname, p2.name, COUNT(*) AS freq FROM person p1, athlete a1, person p2, athlete a2 WHERE p1.id = a1.person_id AND p2.id = a2.person_id AND a1.team_id = a2.team_id AND a1.team_id IN ( SELECT id FROM team, athlete WHERE team.id = athlete.team_id GROUP BY team.id HAVING COUNT(*) = 2 ) GROUP BY p1.id ORDER BY freq DESC Obviously this is a resource consuming query. Is there a way to improve it?

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• Question about software that tracks divs better than notepad++

  - by Jeff

  I recently got hired as a web developer, and the project that I am overseeing has a formatting issue on one of the pages because one of the divs is out of whack. It is a fairly complex page with quite a bit of php, and from what I can gather, I am missing a </div> tag somewhere, and accordingly everything is messed up. I am currently using notepad++, which is decent at lining up divs, meaning that if you click on the opening div tag, it will highlight purple and also highlight the closing one. But it seems as though if you have div tags that span several lines (hundreds) it won't work. Has anyone else run into a similar situation? Is there a better editor I could be using that would do a better job of helping me with my div issue? Or do I have to go through and line up the divs 1 by 1? (there are like over 100). Please let me know!! Thanks

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• C# String builder, displaying data nicely spaced out.

  - by Sef

  Hello, I am wondering how exactly can i order my date nicely in a stringbuilder? Meaning something equal to ("{0,2}", ....) to space the data nicely out. I do not want to use consolewrites of any kind, so the class can be re-used in a form, console code etc... Currently i am using " " for the spacing, but in overall it does not give a proper display. (it messed up when i have numbers with more then 1 digit) public override string ToString() { StringBuilder builder = new StringBuilder(); foreach (int value in tabel) { builder.Append(value); // should have something similiar to ("{0,2}", ....) builder.Append(" "); // should have something similiar to ("{0,2}", ....) } builder.Append("(top:"); builder.Append(top); builder.Append(")"); return builder.ToString(); }/*ToString*/ Regards.

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• concurrent doubly-linked list (1 writer, n-readers)

  - by Arne

  Hi guys, I am back in the field of programming for my Diploma-thesis now and stumbled over the following issue: I need to implement a thread-safe doubly-linked list for one thread writing the list at any position (delete, insert, mutate node data) and one to many threads traversing and reading the list. I am well aware that mutexes can be used to serialize access to the list, still I presume that a naive lock around any write operation will be less than optimal. I am wondering whether there are better variants. (I am well aware that 'optimal' has not much of a practical meaning as long as no exact measure/profiling are available but this is an academic thesis after all..) I am very gratefull for code-samples as well as references to academic granted these have at least a tiny bit of practical relevance. Thanks at lot

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• 3rd party applications API / Framework Q for PHP user site

  - by Ryan

  So we are defining out functional requirements for a user content site and would like to enable: 1) 3rd party developers to develop applications that users can use on their profile 2) Enable users to export content to other sites meaning share their photos on the net. So we were told we need to use APIs for this & it's merely changing data permissions. Is that the only thing we need? Is there a framekwrok we need to build out, or what is the process functioanlly to define out to make these happen? Platform is being built on MySQL and Cake php.

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• Linux How to print all the files with the same prefix after searching for them?

  - by Alyx

  I need to search through a directory which contains many sub directories, each which contain files. The files read as follows question1234_01, where 1234 are random digits and the suffix _01 is the number of messages that contain the prefix, meaning they are apart of the same continuing thread. find . -name 'quest*' | cut -d_ -f1 | awk '{print $1}' | uniq -c | sort -n example output: 1 quest1234 10 quest1523 This searches for all the files then sorts them in order. What I want to do is print all the files which end up having the most occurrences, in my example the one with 10 matches. So it should only output quest1523_01 - 11

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• click event being fired twice - jquery

  - by maxp

  I have the following simplified html: <div class="foo" style="width:200px; height:200px;"> <input type="checkbox" /> </div> <script type="text/javascript"> $('.foo').click(function(){$(this).find('input:checkbox')[0].click();}); </script> Clicking the 200x200 div 'foo' works well, and raises the click event for the checkbox inside it. However when I exactly click the checkbox itself, it fires its 'normal' event, plus the jquery bound event above, meaning the checkbox checks itself, then unchecks itself again. Is there a tidy way to prevent this from happening?

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• What is a good rule for when to prepend members with 'this' (C#)?

  - by RichAmberale

  If I am accessing a member field, property, or method, I'm never sure when I should prepend it with 'this'. I am not asking about cases where it is required, like in the case where a local variable has the same name. I am talking about cases where the meaning is exactly the same. Which is more readable? Are there any standards, best practices, or rules of thumb I should be following? Should it just be consistent throughout a class, or an entire code base?

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• Programming message boards [closed]

  - by Slayer0248

  I'm not at all meaning to seem rude or arrogant or something like that to everyone here, but why must we all be so mean when trying to answer each other's questions? I mean people have the right to pick up a skill such as programming at any point in time. It's not like we aren't encouraged to ask each other for help, but alot of people who are doing the answering seem to generally say "this is simple. why aren't you getting this?". I mean some of it may be, but isn't it really kind of an indicator that we should make the documentations for these things a little more extensive?

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• why are javascript functions like this

  - by Kajal

  I am a starter to javascript. I know to write JS userdefined functions. But recently I came across some thing that I can’t recognize. Can anyone explain to me what this is? (function( window, undefined ) { var jQuery = (function() { }); window.jQuery = window.$ = jQuery; })(window); What is the meaning of this? When I Google javascript functions I am getting only function foo(){ alert("This is an alert"); } I know to use these type of functions

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• PHP Form (post) Repeating input in a tabel

  - by Sef

  Hello, I have a form (with post method) that takes the following input: - a certain name - a number - 3 checkboxes All this input gets generated and calculated in a table.(html code within the php) Everything gets properly calculated and displayed in a table. So my question: How do i make it possible after giving all those input to give in more input? Meaning i have made a hyperlink that goes back to the form itself (where i can give the input). So i can give in new data, and after submiting that again the table now contains 2 rows of values insteed of just 1. Not really sure what exactly i need for this. Regards.

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• is NATURAL JOIN any better than SELECT FROM WHERE in terms of performance ?

  - by ashy_32bit

  Today I got into a debate with my project manager about Cartesian products. He says a 'natural join' is somehow much better than using 'select from where' because the later cause the db engine to internally perform a Cartesian product but the former uses another approach that prevents this. As far as I know, the natural join syntax is not any different in anyway than 'select from where' in terms of performance or meaning, I mean you can use either based on your taste. SELECT * FROM table1,table2 WHERE table1.id=table2.id SELECT * FROM table1 NATURAL JOIN table2 please elaborate about the first query causing a Cartesian product but the second one being somehow more smart

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• About Attributes member of LUID_AND_ATTRIBUTES used in TOKEN_PRIVILEGES structure

  - by Astaroth

  MSDN article, Enabling and Disabling Privileges in C++, provided the a code example to show how to enable or disable a privilege in an access token. I quote the part in questioned: tp.PrivilegeCount = 1; tp.Privileges[0].Luid = luid; if (bEnablePrivilege) tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; else tp.Privileges[0].Attributes = 0; What is the meaning of zero value for Attributes member? According to the documentation of TOKEN_PRIVILEGES structure, the attributes of a privilege can be a combination of the following values: SE_PRIVILEGE_ENABLED  (it is 0x00000002L in WinNT.h) SE_PRIVILEGE_ENABLED_BY_DEFAULT  (it is 0x00000001L in WinNT.h) SE_PRIVILEGE_REMOVED  (it is 0x00000004L in WinNT.h) SE_PRIVILEGE_USED_FOR_ACCESS  (it is 0x80000000L in WinNT.h) So, we don't see any valid constant with a value of zero. I guess, the zero is equal to SE_PRIVILEGE_REMOVED. Anybody here could explain what the zero value really does?

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• Getting number of days between [NSDate date] and string @"2010-11-12"

  - by grobald

  Hello i have a question. in short: i need a function which receives [NSDate date] and string @"2010-11-12" and returns the amount of days between those two dates. more explanation: I need to store a date from a server in the format @"2010-11-12" in my NSUserdefaults. The meaning of this date is the expireDate of a feature in an iPhone App. Everytime i press on a button for this feature i need to check if the difference in days between the current time-[NSDate date] and @"2010-11-12" is greater than 0. That means tahat the feature is disabled. its making me crazy mabey its to dead simple.

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• WMF image data validation?

  - by deostroll

  There is an image capturing device which gives its output in wmf. This output is stored in the database directly. We have cases where at times some of these images do not appear on a web page in IE. But if we right click on the page we are able to save the image on to the hard disk; meaning the image does exist on the page, but does not appear visible. I think this is because of some file corruption issue, but I don't know how to resolve it. We are however able to view such files using MS Picture Viewer (desktop app). Is there anyway we can detect such problematic files?

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• Setting a form field's valule during validation

  - by LaundroMat

  Hi, I read about this issue already, but I'm having trouble understanding why I can't change the value of a form's field during validation. I have a form where a user can enter a decimal value. This value has to be higher than the initial value of the item the user is changing. During clean(), the value that was entered is checked against the item's previous value. I would like to be able to re-set the form field's value to the item's initial value when a user enters a lower value. Is this possible from within the clean() method, or am I forced to do this in the view? Somehow, it doesn't feel right to do this in the view... (To make matters more complicated, the form's fields are built up dynamically, meaning I have to override the form's clean() method instead of using the clean_() method). Thanks in advance!

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• jQuery Nested Droppables

  - by John

  I have a nested set of jQuery droppables...one outer droppable that encompasses most of the page and an a set of nested inner droppables on the page. The functionality I want is: If a draggable is dropped outside of any of the inner droppables it should be accepted by the outer droppable. If a draggable is dropped onto any of the inner droppables it should NOT be accepted by the outer droppable, regardless of whether the inner droppable accepts the draggable. So that would be easy if I could guarantee 1+ inner droppables would accept the draggable, because the greedy attribute would make sure it would only get triggered once. Unfortunately the majority of the time the inner droppable will also reject the draggable, meaning the greedy option doesn't really help. Summary: The basic functionality is a set of valid/invalid inner droppables to accept the draggable, but when you toss the draggable outside any of the draggables it gets destroyed by the outer droppable. What's the best way of doing this?

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