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  • How to start on programming?

    - by Stustu
    At an old age I decided to start programming. I'm fascinated with graphics and web development. I understand general concepts of programming, like loops, functions etc. Which is the language to learn? How to start?

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  • Compiling linux sources in Windows enviroment

    - by Betamoo
    I got a source for console program written in c++ for linux I have got no experience with linux, and have no intend to install it. Is there a (automated) way to compile this source to run in windows? and what about linux functions and libraries called in this file? Thanks

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  • Python - How to pickle yourself?

    - by Mark
    I want my class to implement Save and Load functions which simply do a pickle of the class. But apparently you cannot use 'self' in the fashion below. How can you do this? self = cPickle.load(f) cPickle.dump(self,f,2)

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  • How to auto-generate externs for the Google Closure Compiler

    - by ivo
    Suppose you are working in a javascript project with several external library dependencies, and want to compile your sources using the Google Closure Compiler in ADVANCED_OPTIMIZATIONS mode. Since in this mode the compiler will rename your code calls to the external libraries objects and functions, you must provide externs, to prevent this renaming from happening. But, it is a lot of work to produce the externs by hand, so, what is the best way to auto-generate the appropriate extern from a given javascript lib?

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  • Gridview - Is it necessary to grab data from database every time a filter, sort, or paging event occ

    - by hamlin11
    Regarding gridviews that are not bound to a Data Source Control: In most GridView tutorials that I have seen, when just about any GridView event occurs, the end of the event handler will include BindDataGrid(). In some form, these BindDataGrid() functions 1) Grab data from the database 2) Assign any Filter or Sort expressions to the data, and 3) Bind the gridview to that data source (usually a DataView or DataTable. Is there a better way to provide filterable & sortable data to a GridView without having to hit the database so often? Thanks

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  • Algorithm To Select Most Popular Places from Database

    - by Russell C.
    We have a website that contains a database of places. For each place our users are able to take one of the follow actions which we record: VIEW - View it's profile RATING - Rate it on a scale of 1-5 stars REVIEW - Review it COMPLETED - Mark that they've been there WISH LIST - Mark that they want to go there FAVORITE - Mark that it's one of their favorites In our database table of places each place contains a count of the number of times each action above was taken as well as the average rating given by users. views ratings avg_rating completed wishlist favorite What we want to be able to do is generate lists of the top places using the above information. Ideally, we would want to be able to generate this list using a relatively simple SQL query without needing to do any legwork to calculate additional fields or stack rank places against one another. That being said, since we only have about 50,000 places we could run a nightly cron job to calculate some fields such as rankings on different categories if it would make a meaningful difference in the overall results of our top places. I'd appreciate if you could make some suggestions on how we should think about bubbling the best places to the top, which criteria we should weight more heavily, and given that information - suggest what the MySQL query would need to look like in order to select the top 10 places. One thing to note is that at this time we are less concerned with the recency of a place being popular - meaning that looking at the aggregate information is fine and that more recent data doesn't need to be weighted more heavily. Thanks in advance for your help & advice!

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  • Threading in python: retrieve return value when using target=

    - by Philipp Keller
    I want to get the "free memory" of a bunch of servers like this: def get_mem(servername): res = os.popen('ssh %s "grep MemFree /proc/meminfo | sed \'s/[^0-9]//g\'"' % servername) return res.read().strip() since this can be threaded I want to do something like that: import threading thread1 = threading.Thread(target=get_mem, args=("server01", )) thread1.start() But now: how can I access the return value(s) of the get_mem functions? Do I really need to go the full fledged way creating a class MemThread(threading.Thread) and overwriting __init__ and __run__?

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  • Can one use polygon() or equivalent in lattice and ggplot2 plots?

    - by Alex Reynolds
    Is it possible to annotate lattice (or ggplot2) figures with elements created with polygon() (or elements created with a similar function) from the graphics library? I'm not too familiar with either library beyond examples of simple graphs posted on the web and printed in Deepayan Sarkar's book. Therefore, while I have code for what I've been doing in R with the graphics library, pointing me to relevant, equivalent functions and usage examples for lattice or ggplot2 specifically would be appreciated. Thanks.

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  • Reading Resource Files from my own APK in Android Native Environment

    - by Kyle
    I'm porting to Android. My existing project has a ton of resource files that I'm porting into my Android project. I have them all in /res/raw/, and I would like to access those resources in my native library with functions such as fopen() and such. Can this be done, or do I have to go through JNI for this as well? I would really prefer not to, for ease of porting and possible speed and memory reasons.

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  • Basic social network functionality

    - by Dimitar Vouldjeff
    Hi, I'm going to develop a social like network using Ruby on Rails. For this app I need basic social functionality like friends, activities, authentication, user profile, facebook connect, comments. I searched for rails plugins with social functions and i found - tog and community engine. So which is better and more easier to extend? Thanks

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  • How web browser works ?

    - by Anil Namde
    I have tired to find good documentation of browsers using google but failed to get what i am looking for. Can some one guide me to location where i can actually see how browser functions. The whole purpose of the exercise is to get answers for following queries and more like these.... How images, css and js files are downloaded How js is executed How Ajax request is executed and many more like these..... Thanks all,

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  • jquery block UI malfunction on ajax loading event

    - by Ygam
    problem: trigger errored when block UI is called on this code (function($){ function preloader() { $('a#preloader').click(function(e){ e.preventDefault(); var url = base_url + 'runtest/preloader'; $('div#content').load(url, preloaderCallback); }); } function remotePreload() { $('a#remotepreload').click(function(e){ e.preventDefault(); var object = $(this); object.data('clicked', 'yes'); var url = base_url + 'runtest/remote_preloader'; $('div#content').load(url); }); } /* * callback functions */ function preloaderCallback() { $('div.imageholder img').hide(); $('div.imageholder img').each(function(){ var img = new Image(); var sursa = $(this).attr('src'); var parent = $(this).parent(); var preloaderSource = '<img src="' + base_url + 'media/images/preloader.gif' + '" alt="loader"/>'; parent.append(preloaderSource); $(img).load(function(){ parent.append($(this)); $(this).hide().fadeIn(500); $(this).siblings().remove(); }).attr('src', sursa); }); } function blocker() { $('#content').block(); } function handlePageLoad() { $('a#remotepreload').ajaxStart(function(e){ var elem = $(e.target); if (elem.data('clicked') == 'yes') { // error when blocker() function is called here alert('Started'); } }); $('a#remotepreload').ajaxComplete(function(e){ var elem = $(e.target); if (elem.data('clicked') == 'yes') { elem.removeData('clicked'); alert('Ended'); } }); } // call onready functions $(function(){ preloader(); remotePreload();handlePageLoad(); }); })(jQuery); // here's the error from firefox's debugger uncaught exception: [Exception... "Could not convert JavaScript argument arg 0" nsresult: "0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)" location: "JS frame :: http://localhost/testsuite/media/js/jquery.min.js :: anonymous :: line 115" data: no] here's the html markup <div id="wrap"> <div id="header"> <?= $header ?> </div> <div id="content"> <?= $content ?> </div> <div id="sidebar"> <?= $sidebar ?> </div> <div id="footer"> <?= $footer ?> </div> </div> EDIT I was using Jquery 1.4.1 when this happened. Switched back to 1.3 and everything went back to normal.

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  • Overloading assignment operator in C++

    - by jasonline
    As I've understand, when overloading operator=, the return value should should be a non-const reference. A& A::operator=( const A& ) { // check for self-assignment, do assignment return *this; } It is non-const to allow non-const member functions to be called in cases like: ( a = b ).f(); But why should it return a reference? In what instance will it give a problem if the return value is not declared a reference, let's say return by value?

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  • How do I stop jetty server in clojure?

    - by Mad Wombat
    I am writing a web application using ring and clojure. I am using the jetty adapter for the development server and emacs/SLIME for IDE. While wrap-reload does help, run-jetty blocks my slime session and I would like to be able to start/stop it at will without having to run it in a separate terminal session. Ideally, I would like to define a server agent and functions start-server and stop-server that would start/stop the server inside the agent. Is this possible?

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  • jQuery Adding DOM Elements

    - by Aren B
    This may be a simple answer, but I'm trying to add a dom-created element (i.e. document.createElement(...)) to a jQuery Selector. jQuery has a great assortment of functions for adding html .html(htmlString) .append(htmlString) .prepend(htmlString) But what i want to do is add a dom OBJECT var myFancyDiv = document.createElement("div"); myFancyDiv.setAttribute("id", "FancyDiv"); // This is the theoretical function im looking for. $("#SomeOtherDiv").htmlDom(myFancyDiv);

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  • dynamically load PHP code from external file

    - by jera
    code is in a static class in an external file eg. /home/test/public_html/fg2/templatecode/RecordMOD/photoslide.mod how do I load this into my script on demand, and be able to call its functions ? I am a novice at php , so please explain your code. help is appreciated. Jer

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  • Expression Tree with Property Inheritance causes an argument exception

    - by Adam Driscoll
    Following this post: link text I'm trying to create an expression tree that references the property of a property. My code looks like this: public interface IFoo { void X {get;set;} } public interface IBar : IFoo { void Y {get;set;} } public interface IFooBarContainer { IBar Bar {get;set;} } public class Filterer { //Where T = "IFooBarContainer" public IQueryable<T> Filter<T>(IEnumerable<T> collection) { var argument = Expression.Parameter(typeof (T), "item"); //... //where propertyName = "IBar.X"; PropertyOfProperty(argument, propertyName); } private static MemberExpression PropertyOfProperty(Expression expr, string propertyName) { return propertyName.Split('.').Aggregate<string, MemberExpression>(null, (current, property) => Expression.Property(current ?? expr, property)); } } I receive the exception: System.ArgumentException: Instance property 'X' is not defined for type 'IBar' ReSharper turned the code in the link above into the condensed statement in my example. Both forms of the method returned the same error. If I reference IBar.Y the method does not fail.

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  • Debugging site written mainly in JScript with AJAX code injection

    - by blumidoo
    Hello, I have a legacy code to maintain and while trying to understand the logic behind the code, I have run into lots of annoying issues. The application is written mainly in Java Script, with extensive usage of jQuery + different plugins, especially Accordion. It creates a wizard-like flow, where client code for the next step is downloaded in the background by injecting a result of a remote AJAX request. It also uses callbacks a lot and pretty complicated "by convention" programming style (lots of events handlers are created on the fly based on certain object names - e.g. current page name, current step name). Adding to that, the code is very messy and there is no obvious inner structure - the functions are scattered in the code, file names do not reflect the business role of the code, lots of functions and code snippets are most likely not used at all etc. PROBLEM: How to approach this code base, so that the inner flow of the code can be sort-of "reverse engineered" using a suite of smart debugging tools. Ideally, I would like to be able to attach to the running application and step through the code, breaking on each new function call. Also, it would be nice to be able to create a "diagram of calls" in the application (i.e. in order to run a particular page logic, this particular flow of function calls was executed in a particular order). Not to mention to be able to run a coverage analysis, identifying potentially orphaned code fragments. I would like to stress out once more, that it is impossible to understand the inner logic of the application just by looking at the code itself, unless you have LOTS of spare time and beer crates, which I unfortunately do not have :/ (shame...) An IDE of some sort that would aid in extending that code would be also great, but I am currently looking into possibility to use Visual Studio 2010 to do the job, as the site itself is a mix of Classic ASP and ASP.NET (I'd say - 70% Java Script with jQuery, 30% ASP). I have obviously tried FireBug, but I was unable to find a way to define a breakpoint or step into the code, which is "injected" into the client JS using AJAX calls (i.e. the application retrieves the code by invoking an URL and injects it to the client local code). Venkman debugger had similar issues. Any hints would be welcome. Feel free to ask additional questions.

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