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• How can I try a new language or framework without installing it?

  - by flamingLogos

  With so many languages and frameworks that exist, and with new ones appearing all the time, I don't have the time to download, install, and configure each one to evaluate it. In the past I've run across webapps that allow one to write or paste code into a window, and see the results in realtime in the browser, usually in a tutorial setting. What are your favorite sandbox sites for a given technology? Edit: @fretj provided the link to the excellent Google Code Playground (+1 upvote), but I thought that it was just for experimenting with Google's own apps (Search, Maps, Earth, Language, etc). But it turns out that it contains a few hidden gems: In addition to their apps, you can try out the many Javascript libraries that they host including jQuery, jQuery UI, MooTools, Dojo, and Prototype Scriptaculous. They're all hidden under the Libraries category in the "Pick an API" box. I overlooked the category because I thought it was for an app called Google Libraries. There's also a Javascript category for Javascript itself.

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• How do I make a class whose interface matches double, but upon which templates can be specialized?

  - by Neil G

  How do I make a class whose interface matches double, but whose templated types do not dynamic cast to double? The reason is that I have a run-time type system, and I want to be able to have a type that works just like double: template<int min_value, int max_value> class BoundedDouble: public double {}; And then inherit use template specialization to get run-time information about that type: template<typename T> class Type { etc. } template<int min_value, int max_value> class Type<BoundedDouble<min_value, max_value>> { int min() const { return min_value; } etc. } But, you can't inherit from double...

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• Reinstalling Debian Package -manager?

  - by hhh

  I have had this problem for too long time: package-manager not working or very unstable, examples here. Now suppose my laptop has very little precious stuff. Is there some easy way to reinstall Debian -package-manager? I don't really have time to fix this problem so I am considering reinstallation of the OS, I have no idea what is causing this repetitive errors with the installers such as aptitude, pip and apt-get. How can I reinstall the package-managers? Perhaps related rebuilding packages and the package manager on debian

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• Keeping DB Table sorted using multi-field formula (Microsoft SQL)

  - by user298167

  Hello Everybody. I have a Job Table which has two interesting columns: Creation Date and Importance (high - 3, medium 2, low - 1). Job's priority calculated like this: Priority = Importance * (time passed since creation). The problem is, Every time I would like to pick 200 jobs with highest priority, I dont want to resort the table. Is there a way to keep rows sorted? I was also thinking about having three tables one for High, Medium and Low and then sort those by Creation Date. Thanks

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• Apache 2.2 / Win7 - slow or not responsive

  - by joey

  My configuration - Windows 7 x64, Php 5.3, Apache 2.2.15, latest Mysql. When loading pages from localhost, the response time shown by firebug is more 530ms for the main 'index.php' file, sometimes the connection is reset. It's painfully slow. I googled the problem and found a workaround - switch off and on again a win service called BFE - base filtering engine. Then everything works like a lightning but xdebug doesn't work in netbeans. Why is this response time so long? Can you think of any other solution than BFE toggling? joey33

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• Where are the function literals in c++?

  - by academicRobot

  First of all, maybe literals is not the right term for this concept, but its the closest I could think of (not literals in the sense of functions as first class citizens). The idea is that when you make a conventional function call, it compiles to something like this: callq <immediate address> But if you make a function call using a function pointer, it compiles to something like this: mov <memory location>,%rax callq *%rax Which is all well and good. However, what if I'm writing a template library that requires a callback of some sort with a specified argument list and the user of the library is expected to know what function they want to call at compile time? Then I would like to write my template to accept a function literal as a template parameter. So, similar to template <int int_literal> struct my_template {...};` I'd like to write template <func_literal_t func_literal> struct my_template {...}; and have calls to func_literal within my_template compile to callq <immediate address>. Is there a facility in C++ for this, or a work around to achieve the same effect? If not, why not (e.g. some cataclysmic side effects)? How about C++0x or another language? Solutions that are not portable are fine. Solutions that include the use of member function pointers would be ideal. I'm not particularly interested in being told "You are a <socially unacceptable term for a person of low IQ>, just use function pointers/functors." This is a curiosity based question, and it seems that it might be useful in some (albeit limited) applications. It seems like this should be possible since function names are just placeholders for a (relative) memory address, so why not allow more liberal use (e.g. aliasing) of this placeholder. p.s. I use function pointers and functions objects all the the time and they are great. But this post got me thinking about the don't pay for what you don't use principle in relation to function calls, and it seems like forcing the use of function pointers or similar facility when the function is known at compile time is a violation of this principle, though a small one.

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• Mac OS X 10.5+ and POSIX

  - by Phil

  Hello, I need to program an authentication module that has to work with Mac OS X 10.6 Snow Leopard and at the same time needs to be POSIX-compliant. I read here: developer.apple.com/leopard/overview/osfoundations.html that since Mac OS X 10.5 Leopard, Mac OS X is POSIX-compliant (to POSIX 1003.1), but working under MAC OS X 10.5 Leopard myself, I can't find any trace of my user name neither in /etc/passwd nor in its successor /etc/master.passwd, which is mentioned here: developer.apple.com/mac/library/DOCUMENTATION/Darwin/Reference/ManPages/man5/passwd.5.html Instead it says in both files OpenDirectory Service is used, which should be OpenLDAP according to the OpenDirectoryService man-page. Is this still POSIX-compliant ? I guess not. I wonder how Mac OS X would handle my 100% POSIX-compliant code which depends on /etc/passwd ? I would be gratefull if someone could explain the way this works to me. Thank you for your time and trouble. Best regards Phil.

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• Sometimes, scaling down a bitmap generates a bigger file. Why?

  - by Matías

  Hello, I'm trying to write a method to reduce the size of any image 50% each time is called but I've found a problem. Sometimes, I end up with a bigger filesize while the image is really just half of what it was. I'm taking care of DPI and PixelFormat. What else am I missing? Thank you for your time. public Bitmap ResizeBitmap(Bitmap origBitmap, int nWidth, int nHeight) { Bitmap newBitmap = new Bitmap(nWidth, nHeight, origBitmap.PixelFormat); newBitmap.SetResolution(origBitmap.HorizontalResolution, origBitmap.VerticalResolution); using (Graphics g = Graphics.FromImage((Image)newBitmap)) { g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(origBitmap, 0, 0, nWidth, nHeight); } return newBitmap; }

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• C#:multicolumn sorting of datagrid view

  - by Bi

  I have a datagridview in a windows form with 3 columns: Serial number, Name and Date-Time. The Name column will always have either of the two values: "name1" or "name2". I need to sort these columns such that the grid displays all the rows with name values in a specific order (first display all the "name1" rows and then all the "name2" rows). Within the "name1" rows, I want the rows to be sorted by the Date-Time. Please note programmatically, all the 3 columns are strings. For example, if I have the rows: 01 |Name1 | 2010-05-05 10:00 PM 02 |Name2 | 2010-05-02 08:00 AM 03 |Name2 | 2010-05-01 08:00 AM 04 |Name1 | 2010-05-01 11:00 AM 05 |Name1 | 2010-05-04 07:00 AM needs to be sorted as 04 |Name1 | 2010-05-01 11:00 AM 05 |Name1 | 2010-05-04 07:00 AM 01 |Name1 | 2010-05-05 10:00 PM 03 |Name2 | 2010-05-01 08:00 AM 02 |Name2 | 2010-05-02 08:00 AM I am not sure how to go about using the below: myGrid.Sort(.....,ListSortDirection.Ascending)

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• Is ReaderWriterLockSlim.EnterUpgradeableReadLock() essentially the same as Monitor.Enter()?

  - by Neil Barnwell

  So I have a situation where I may have many, many reads and only the occasional write to a resource shared between multiple threads. A long time ago I read about ReaderWriterLock, and have read about ReaderWriterGate which attempts to mitigate the issue where many writes coming in trump reads and hurt performance. However, now I've become aware of ReaderWriterLockSlim... From the docs, I believe that there can only be one thread in "upgradeable mode" at any one time. In a situation where the only access I'm using is EnterUpgradeableReadLock() (which is appropriate for my scenario) then is there much difference to just sticking with lock(){}? Here's the excerpt: A thread that tries to enter upgradeable mode blocks if there is already a thread in upgradeable mode, if there are threads waiting to enter write mode, or if there is a single thread in write mode. Or, does the recursion policy make any difference to this?

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• Why does java have an interpreter? and not a compiler?

  - by Galaxin

  Iam a newbie to java and was wondering why java have a interpreter and not a compiler? While shifting from c++ to java we come across the differences between these two Compilation process being one of them. 1.A major difference between a compiler and interpreter is that compiler compiles the whole code at once and displays all the errors at a time whereas an interpreter interprets line by line. 2.Also a compiler takes a less time to compile a code when compared to an interpreter. When java was developed for more advanced and easy features and implementations why has it been restricted to a interpreter based on above facts? Is there any special reason why this is so? If yes what is it?

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• Ruby and Rails Async

  - by Edijs Petersons

  I need to perform long-running operation in ruby/rails asynchronously. Googling around one of the options I find is Sidekiq. class WeeklyReportWorker include Sidekiq::Worker def perform(user, product, year = Time.now.year, week = Date.today.cweek) report = WeeklyReport.build(user, product, year, week) report.save end end # call WeeklyReportWorker.perform_async('user', 'product') Everything works great! But there is a problem. If I keep calling this async method every few seconds, but the actual time heavy operation performs is one minute things won't work. Let me put it in example. 5.times { WeeklyReportWorker.perform_async('user', 'product') } Now my heavy operation will be performed 5 times. Optimally it should have performed only once or twice depending on whether execution of first operaton started before 5th async call was made. Do you have tips how to solve it?

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• iphone: repeating a transformation

  - by gonso

  Hi I'm trying to represent a view that rotates on the iphone screen. I have a button and when you press it, the view rotates 180 degrees. My problem is that this only works the first time. Here is the code: -(IBAction) flip:(id)sender{ CGAffineTransform transform; //the transform matrix to be used below //BEGIN ANIMATIONS [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:2.0]; //animate if (flag){ transform = CGAffineTransformMakeRotation( RADIANS(180) ); } else { transform = CGAffineTransformMakeRotation( RADIANS(-180) ); } flag = !flag; transform = CGAffineTransformTranslate(transform, 0, 0); self.mySuview.transform = transform; //COMMIT ANIMATIONS [UIView commitAnimations]; } The first time you click, the view spins alright, but when you click again NOTHING happens. No errors, no changes on the view. What am I missing? Thanks Gonso

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• ContextSwitchDeadlock Was Detected error in C#

  - by assassin

  Hi, I am running a C# application, and during run-time I get the following error: The CLR has been unable to transition from COM context 0x20e480 to COM context 0x20e5f0 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations. Can anyone please help me out with the problem here? Thanks a lot.

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• Updating a session variable on a page that uses enablesessionstate=readonly attribute doesn't fail f

  - by chandmk

  Asp.Net allows you you set the session state to readonly at individual page level or in the web.config for all pages. But it doesn't prevent you from creating a brand new session variable on that page or modify an existing session variable. But when you try to use that session variable it is either not available or its value is not modified. Why wouldn't the asp.net framework throw a run time error, if not compile time error, when a write attempt is made to a session on the pages where that is not allowed?

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• JQuery cookie access has stopped working for GAE app

  - by Greg

  I have a google app engine app that has been running for some time, and some javascript code that checks for a login cookie has suddenly stopped working. As far as I can tell, NO code has changed. The relevant code uses the jquery cookies plugin (jquery.cookies.2.2.0.min.js)... // control the default screen depending // if someone is logged in if( $.cookies.get('dev_appserver_login') != null || $.cookies.get('ACSID') != null ) { alert("valid cookie!") $("#inventory-container").show(); } else { alert("INvalid cookie!") $("#welcome-container").show(); } The reason for the two checks is that in the GAE SDK, the cookies are named differently. The production system uses 'ACSID'. This if statement works in the SDK and now fails 100% of the time in production. I have verified that the cookie is, in fact, present when I inspect the page. Thoughts?

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• Build Interactive Floor With Projection !?

  - by Synxmax

  Dear Guys I am somehow newbie and sometimes guru , but at this moment i don't have enough time to research My nightmare is , my boss ask me to create an interactive floor ( he just saw in an exhibition ) , he ask me to create one of them instead of buying , i am an actionscript crawler and developer with some skills in java and c# programming , i just made some track motion with a simple web cam , and this idea came to my mind if i can use an infrared or thermographic camera instead of simple camera so i can get better positioning if camera place at top of floor ! Now i just came here to ask you guys is there any resource , tip , help i can know before getting into this deal !? is there any lib or api out to deal with this ?! EVEN, if there is any resource , article from another language c++ , c , .... could help i just didn't have enough time to test lot of ways If you search interactive floors , or interactive floor projection you can find some companies who provide such a thing Thanks in advance ( and sorry for my damn poor english , français could be better :D )

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• Either .each do or .all isn't working how I think it should

  - by user1299656

  So whenever someone rates a shop, I want the Shop model to calculate its new average rating and store that in the database (instead of calculating the average every time someone looks at it). So I wrote the segment of code that follows, and it doesn't work. The loop always iterates exactly once, no matter how many shop_ratings in the database exist that have the shop's id as their shop_id. I played around with it a bit and found that every time a new rating is submitted the function is called successfully, but it only runs the loop once and sets the average to what the first rating was. I don't know if the "query" that sets the ratings variable is wrong or if it's the loop that's wrong. class Shop < ActiveRecord::Base has_many :shop_ratings attr_accessible :name, :latitude, :longitude validates_presence_of :name validates_presence_of :latitude validates_presence_of :longitude def distance_to(lat, long) return (self.longitude - long) + (self.latitude - lat) end def find_average total = 0 count = 0 ratings = ShopRating.all(:conditions => {:shop_id => id}) ratings.each do |submission| total = total + submission.rating count = count + 1 end update_attribute :average_rating, total/count end end

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• What good timesheet should and shouldn't have for a small (non programming) 50 people company?

  - by MadBoy

  I'm sure most people here had to fill at least one time sheet in their life that made their life miserable, hell it's even the worst time taker ever especially after you have to fill it in hurry. I will be developing some simple TimeSheet application for a small company of 50 people (non programming related, it's actually 4 companies working together) and would like it to be user friendly and as less disturbing as possible. So what in your opinion makes it a good timesheet (lack of it doesn't count :p), what data it should store? Should be only hours per day with possibility to choose project, company and simple overview what you have worked on like: Day 1, 3:00, 'Company 1', 'Project5', 'Name', Short Overview Day 1, 5:00, 'Company 2', 'Project6', 'Name', Short Overview Or should it gather more data? Would it be realy bad if it were an WinForms application considering that I don't know ASP.NET or any other web based language? I would be deploying it using ClickOnce or so.

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• urlopen error [errno 111] connection refused

  - by Ui-Gyun Jeong

  I am doing python exercise with a book 'headfirst python' and making android app by using python and sl4a my code is import android import json import time from urllib import urlencode from urllib2 import urlopen hello_msg = "Welcome to Coach Kelly's Timing App" list_title = 'Here is your list of athletes:' quit_msg = "Quitting Coach Kelly's App." web_server = 'http://127.0.0.1:8080' get_names_cgi = '/cgi-bin/generate_name.py' def send_to_server(url, post_data=None): if post_data: page = urlopen(url, urlencode(post_data)) else: page = urlopen(url) return(page.read().decode("utf8")) app = android.Android() def status_update(msg, how_long=2): app.makeToast(msg) time.sleep(how_long) status_update(hello_msg) athlete_names = sorted(json.loads(send_to_server(web_server + get_names_cgi))) app.dialogCreateAlert(list_title) app.dialogSetSingleChoiceItems(athlete_names) app.dialogSetPositiveButtonText('Select') app.dialogSetNegativeButtonText('Quit') app.dialogShow() resp = app.dialogGetResponse().result status_update(quit_msg) this is my code and the result is what is the problem??? I can not figure out what the problem is...

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• Learning to think in the Object Oriented Way

  - by SpikETidE

  Hi Everyone.... I am a programmer trying to learn to code in the object oriented paradigm... I mainly work with PHP and i thought of learning the zend framework... So, felt I need to learn to code in OO PHP.... The problem is, having done code using functions for quite a long time, i just can't get my head to think in the OO way.... Also felt that probably I am not the only one facing this problem since the beginning of time... So, how did you people learn object oriented programming... especially how did you succeed in "unlearning" to code using functions... and learn to see you code as objects...? Is there any good resource books or sites where one could find help...?? Thanks for sharing your knowledge and experiences...

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• Modify .resx file at runtime

  - by Gerry Whitworth

  Building a ASP.NET MVC site and I would like to add some values to my .resx file at run time. I have tried: IResourceWriter writer = new ResourceWriter("myResources.resources"); writer.AddResource("String 3", "Third String"); writer.Close(); This code compiles and executes fine but after I close the website and look at the .resx file it is corrupt and I must re-create the .resx file again. Note that I have two values in this .resx file I added at design time. Thanks Gerry

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• Batch file writing to log then ending process

  - by Andrew Service

  I have a batch file that calls a process and in that process I have: IF %ERRORLEVEL% NEQ 0 EXIT /B %ERRORLEVEL% Now I wanted to upgrade this a bit and give some meaningful message to an output log when if the process fails, also I do not want the main batch to continue processing because the next processes are dependent on data from previous calls; I wonder if this would be correct but not sure: CALL Process 1 IF %ERRORLEVEL% NEQ 0 GOTO ErrorInfirstProcess /B %ERRORLEVEL% :ErrorInfirstProcess ECHO Process 1 Failed on %Date% at %Time%. >>C:\Log.txt" CALL Process 2 IF %ERRORLEVEL% NEQ 0 GOTO ErrorInSecondProcess /B %ERRORLEVEL% :ErrorInSecondProcess ECHO Process 2 Failed on %Date% at %Time%. >>C:\Log.txt" I also want to know if I still need the /B or do I need to put an EXIT command after the echo? Thanks A

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• Does it make a difference in performance if I use self.fooBar instead of fooBar?

  - by mystify

  Note: I know exactly what a property is. This question is about performance. Using self.fooBar for READ access seems a waste of time for me. Unnecessary Objective-C messaging is going on. The getters typically simply pass along the ivar, so as long as it's pretty sure there will be no reasonable getter method written, I think it's perfectly fine to bypass this heavy guy. Objective-C messaging is about 20 times slower than direct calls. So if there is some high-performance-high-frequency code with hundreds of properties in use, maybe it does help a lot to avoid unnessessary objective-c messaging? Or am I wasting my time thinking about this?

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• Publish failed in Web Application Project (MVC)

  - by Stuck

  I usually use the "Publish" feature in VS 2008 to get the correct files and so on that I can publish to my website. But from time to time publish fails without any good error message at all. I know that it can be a couple of different reasons but I am starting to grow really tired with this now. Can anyone teach me how to build the website from the command line? As I said it is a MVC project. Can I use the aspnet_compiler for this? What parameters should I use to simulate the same behavior as a "Publish"?

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