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• How can a language be interpreted by itself (like Rubinius)?

  - by japancheese

  I've been programming in Ruby for a while now with just the standard MRI implementation of Ruby, but I've always been curious about the other implementations I hear so much about. I was reading about Rubinius the other day, a Ruby interpreter written in Ruby. I tried looking it up in various places, but I was having a hard time figuring out exactly how something like this works. I've never had much experience in compilers or language writing but I'm really interested to figure it out. How exactly can a language be interpreted by itself? Is there a basic step in compiling that I don't understand where this makes sense? Can someone explain this to me like I'm an idiot (because that wouldn't be too far off base anyways)

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• How to efficiently implement a blocking call with Rails, while letting the client wait for the reply

  - by Kyle Heironimus

  We have a web service written in Rails. The API is published and we cannot change it. Our app communicates with a remote web service that sometimes hangs or takes several seconds to reply. Client -> Our Web Service -> Remote Web Service Currently, if the remote web service hangs for 5 seconds, one of our rails processes on our web service also hangs with it, which is what we need to avoid. I've seen things such as mod-x-sendfile, modporter, and delayed jobs, but the best I can tell, they all assume the client is not waiting for an answer. Since the API is already established, we cannot tell the client "I'm attempting to do what you want, check back later for the answer." The best option we have come up with so far is to add a second, non-rails web server running eventmachine to process these particular calls. Is there a better way?

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• Reload a div with jquery, but not with .load

  - by zomboble

  I need to reload a div on a page on click. So far I have this: <div id="next"><a id="nextC" href="#">NEXT TESTIMONIAL</a></div><!-- END #next --> And the js $('#nextC').click(function(){ $('#atestimonial').load('/ #atestimonial'); evt.preventDefault(); }); I am using wordpress and I have a method sorted for pulling data into the div atestimonial. All I need to do is refresh it on click, doesnt matter about loading a page in. Can this be done?

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• issue occur while implementing tabs in css

  - by user3592205

  i was implementing tabbed feature using radio button hack,here is the tutorial from where i was learning. http://tympanus.net/codrops/2012/04/12/animated-content-tabs-with-css3/ and this is the final output http://tympanus.net/Tutorials/CSS3ContentTabs/ while implementing i am stuck at this, i suppose this issue occurs because content's opacity is set to 0 when radio button is checked or clearfix issue. here is what i got so far http://jsfiddle.net/parasrochiya/F8zva/ please help me out ..I hope you'll understand what i'm trying to implement. thanks in advance for your help.

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• Uniforme distance between points

  - by Reonarudo

  Hello, How could I, having a path defined by several points that are not in a uniform distance from each other, redefine along the same path the same number of points but with a uniform distance. I'm trying to do this in Objective-C with NSArrays of CGPoints but so far I haven't had any luck with this. Thank you for any help. EDIT I was wondering if it would help to reduce the number of points, like when detecting if 3 points are collinear we could remove the middle one, but I'm not sure that would help.

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• Wrong shortcut icons on the desktop and in the programs menu

  - by Zenya

  When creating a program setup, I also put some documentation or readme files in it. However after the program is installed, I get wrong icons on the desktop and in the programs menu, as below: What I expected: I thought that for the registered file types (such as pdf, txt, doc, etc.) I don't need to set icons manually in the setup project. Am i wrong? As far as I know some other installers doesn't have such problem. Does anybody know how to fix this for Visual Studio? My environment is: Visual Studio 2005, C#, Windows XP Pro SP3

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• Intermittent/staggered loading of an object

  - by cammy

  Hi guys, I've just recently tried my hand at actionscript 3 and have come across a road block. How do I go about rendering the cubes (cube1) intermittently, ie. staggered loading. I need the cubes to load a split second from each other. Below is a snippet of what I have so far: var rows:int = 5; var cols:int = 3; var spacery:int = 100; var spacerx:int = 120; var box_count:int = 8; for(var i:int; i < box_count; i++) { cube1 = new Cube(ml,100,10,80,1,1,1); cube1.y = ((i % rows)) * (cube1.x + spacery); cube1.x = Math.floor(i/rows) * (cube1.x +spacerx); cube1.z = 0; bigBox.addChild(cube1); }

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• get data from gridview without querying database

  - by frank2009

  Hi there I am new at this so please bear with me... I have managed to get the following code to work...so when I click on the "select" link in each row of the gridview, the data is transfered to other label/textbox on the webpage. So far so good, the thing is that everytime I click on select...it goes and checks on the database for the data and there is a delay of a few seconds... I was hoping that the data, since it is already visible on the gridrows, is simply "picked up" and used on other labels/textboxes...without requerying the database. Is this possible ? Thanks in advance Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Label1.Text = GridView2.SelectedRow.Cells(8).Text Label2.Text = GridView2.SelectedRow.Cells(9).Text TextBox1.Text = GridView2.SelectedRow.Cells(7).Text End Sub

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• Android ImageButton / Custom-Button?

  - by user568306

  Hi everyone, I am new to android development. So far I could help myself in all matters by reading threads here on stackoverflow. Now I am stuck and need someones help. Unfortunately I am not allowed to post an image of a screenshot because I am a new mamber, so I try to descripe it. I have a Samsung Galasy S and the clock app that ships with it has an button called "+ Create alarm". I want to create a similar button for my app. I've been experimenting with ImageButton. I do know how to get that "+"-Icon onto an ImageButton, but only centered and without text. I guess this is a custom button. Does anyone know how to do this? Can I do it in xml or do I need to extend the view-class and make it my own view?

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• How to show, not download, images in apache?

  - by jawonlee

  I'm dynamically generating some charts using mod_python, in .png and .pdf formats. When a user points to /some/path/some_imagefile_name.png, I want to show the image within the browser, like in this url. I also want the image to be accessible from an HTML <img src=> tag. So far, whenever I point my browser to a .png address from my server, the .png and .pdf are automatically downloaded instead of being viewed. How should I fix this? I tagged this under Apache, since I figured it would be an Apache config thing. If it's not, please point me towards the right direction.

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• Recursive CTE with alternating tables

  - by SOfanatic

  I've created a SQL fiddle here. Basically, I have 3 tables BaseTable, Files, and a LinkingTable. The Files table has 3 columns: PK, BaseTableId, RecursiveId (ChildId). What I want to do is find all the children given a BaseTableId (i.e., ParentId). The tricky part is that the way the children are found works like this: Take ParentId 1 and use that to look up a FileId in the Files table, then use that FileId to look for a ChildId in the LinkingTable, if that record exists then use the RecursiveId in the LinkingTable to look for the next FileId in the Files table and so on. This is my CTE so far: with CTE as ( select lt.FileId, lt.RecursiveId, 0 as [level], bt.BaseTableId from BaseTable bt join Files f on bt.BaseTableId = f.BaseTableId join LinkingTable lt on f.FileId = lt.FileId where bt.BaseTableId = @Id UNION ALL select rlt.FileId, rlt.RecursiveId, [level] + 1 as [level], CTE.BaseTableId from CTE --??? and this is where I get lost ... ) A correct output for BaseTableId = 1, should be: FileId|RecursiveId|level|BaseTableId 1 1 0 1 3 2 1 1 4 3 2 1

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• Creating an object in javascript pointing to a table row with an "id"

  - by Matt

  I'm having trouble finding information online for creating a object in javascript and pointing it to a id in the html. Here's what I have so far for the JavaScript: function countRecords() { headRow=new Object(); //point to specific id here? var rowCount = 0; The HTML: <table id="prodTable"> <tr><th colspan="8">Digital Cameras</th></tr> <tr id="titleRow"> <th>Model</th> <th>Manufacturer</th> <th>Resolution</th> <th>Zoom</th> <th>Media</th> <th>Video</th> <th>Microphone</th> </tr>

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• How to post XML document to HTTP with VB.Net

  - by Joshua McGinnis

  I'm looking for help with posting my XML document to a url in VB.NET. Here's what I have so far ... Public Shared xml As New System.Xml.XmlDocument() Public Shared Sub Main() Dim root As XmlElement root = xml.CreateElement("root") xml.AppendChild(root) Dim username As XmlElement username = xml.CreateElement("username") username.InnerText = _username root.AppendChild(username) xml.Save(Console.Out) Dim url = "https://mydomain.com" Dim req As WebRequest = WebRequest.Create(url) req.Method = "POST" req.ContentType = "application/xml" req.Headers.Add("Custom: API_Method") Console.WriteLine(req.Headers.ToString()) This is where things go awry: I want to post the xml, and then print the results to console. Dim newStream As Stream = req.GetRequestStream() xml.Save(newStream) Dim response As WebResponse = req.GetResponse() Console.WriteLine(response.ToString()) End Sub

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• C++: FFMPEG and SDL resources

  - by advs89

  I'm looking for resources (preferably books, but websites are fine too) for using FFMPEG and/or SDL with C++. Stuff I'd like to be able to do (eventually): Decode and play videos in realtime to a QT widget (the QT part isn't a problem) Overlay text and images on the video (in realtime) Loop video Cross-fade from one video to another (in realtime) Some kind of DVD functionality LIVE sources? (i.e. webcam, stream, etc.) So far I've looked at (and consider helpful) the following resources: FFMPEG and SDL Tutorial by Dranger (extremely helpful) StackOverflow: ffmpeg C API documentation/tutorial (not a duplicate, btw) Sample code bundled with FFMPEG libraries (I'll try and update this list with anything helpful below) Thanks for any help... Also: Operating System is Windows (but maybe one day cross-platform) Also 2: Resources using alternatives are welcome too... i.e. DirectShow, VFW, etc.

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• Solving the problem of finding parts which work well with each other

  - by dotnetdev

  Hi, I have a database of items. They are for cars and similar parts (eg cam/pistons) work better than others in different combinations (eg one product will work well with another, while another combination of 2 parts may not). There are so many possible permutations, what solutions apply to this problem? So far, I feel that these are possible approaches (Where I have question marks, something tells me these are solutions but I am not 100% confident they are). Neural networks (?) Collection-based approach (selection of parts in a collection for cam, and likewise for pistons in another collection, all work well with each other) Business rules engine (?) What are good ways to tackle this sort of problem? Thanks

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• Compile Qt Project To Run On A Linux System

  - by ForgiveMeI'mAN00b

  I have a Qt project. It uses the cross platform libraries SDL, OpenGL and FLTK. I want to be able to compile the project so that it can run on a Linux computer. I'm looking at a bunch of articles I have seen so far two ways to do this. Use a cross compiler, which seems to me a rather complicated thing to setup and compile with, or, the other options, is to compile the project simply on a Linux computer, simply the Linux version of Qt creator/SDK. My question is, If I have a Qt project that uses only cross platform libraries, then is creating a Windows version easy as compiling it in Qt/Windows, and creating the Linux version as easy as doing it in Qt/Linux? PS. Please don't ask/complain about why I didn't just try to see if it works myself, I don't have any Linux OS's installed on my computer right now, and I don't want to risk going into the trouble of installing a whole new OS just to have it not work in the end.

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• jQuery hide/show div using variables

  - by user295927

  I am a nOOb to jQuery. I want to use variables in jQuery to hide/show divs. what I have so far is: $(document).ready(function(){ $('#listMenu a').click(function () { var getPage = $(this).attr("id"); var getName = $(this).attr("name"); //console.log(getPage); //console.log(getName); $("#" & getName ).show(); }); }); firebug console shows that I have the vars correctly, but I get this error next: this[H].style is undefined [Break on this error] (function(){var R=/((?:((?:([^()]+)...typeof K==="string"?K:K+"px")}})})(); any help is appreciated. sjs

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• Connection and Collection Interfaces in Java

  - by Bhupi

  Which class implements all the Connection Interfaces which are in javax.microedition.io package and how? And in the same way which class implements the some of Collection interfaces like Iterator interface. I saw a code: - Iterator it; ArrayList list = new ArrayList(); it = list.iterator(); The iterator() return type is "Iterator" which is an interface. Please tell me what this code is doing is it returning an object of type Iterator? but as far as I know, interface can't be initialized.

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• Composite primary keys in N-M relation or not?

  - by BerggreenDK

  Lets say we have 3 tables (actually I have 2 at the moment, but this example might illustrate the thought better): [Person] ID: int, primary key Name: nvarchar(xx) [Group] ID: int, primary key Name: nvarchar(xx) [Role] ID: int, primary key Name: nvarchar(xx) [PersonGroupRole] Person_ID: int, PRIMARY COMPOSITE OR NOT? Group_ID: int, PRIMARY COMPOSITE OR NOT? Role_ID: int, PRIMARY COMPOSITE OR NOT? Should any of the 3 ID's in the relation PersonGroupRole be marked as PRIMARY key or should they all 3 be combined into one composite?? whats the real benefit of doing it or not? I can join anyways as far as I know, so Person JOIN PersonGroupRole JOIN Group gives me which persons are in which Groups etc. I will be using LINQ/C#/.NET on top of SQL-express and SQL-server, so if there is any reasons regarding language/SQL that might make the choice more clear, thats the platform I ask about. Looking forward to see what answers pops up, as I have thought of these primary keys/indexes many times when making combined ones.

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• Is there a shorthand way to denullify a string in C#?

  - by Moose Factory

  Is there a shorthand way to denullify a string in C#? It would be the equivalent of (if 'x' is a string): string y = x == null ? "" : x; I guess I'm hoping there's some operator that would work something like: string y = #x; Wishful thinking, huh? The closest I've got so far is an extension method on the string class: public static string ToNotNull(this string value) { return value == null ? "" : value; } which allows me to do: string y = x.ToNotNull(); Any improvements on that, anyone?

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• C++ Boost bind value type

  - by aaa

  hello. I look in documentation and source code but cannot figure out how to get return value type of boost bind functor. I am trying to accomplish following: 35 template<typename T,size_t N, class F> 36 boost::array<typename F::value_type, N> make_array(T (&input)[N], F unary) { 37 boost::array<typename F::value_type, N> array; 38 std::transform(input, input + N, array.begin(), unary); 39 return array; 40 } where F can be bind functor. the above does not work because functor does not have value_type. for that matter, is there standard interface for unary/binary functor as far as return value. Thanks

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• Regex - how to extract number which falls on specified ID?

  - by cbros2008

  I'm trying to extract the number '1' that appears on the line with the ID I'm feeding (i.e. 12072). I've been trying for the past 2 hours to get this regex to work but I'm at a loss. So far I've got 12072.*?(\d+)(?!.*\d) but this extracts me everything from 12072 to the 1. Here's the text: <td id="12072" scope="#999999" bgcolor="#999999" style="width: 65; color:#999999" align="center" onclick="DaySelect(this)" title="">1</td> <td id="12073" scope="#999999" bgcolor="#999999" style="width: 65; color:#999999" align="center" onclick="DaySelect(this)" title="">1</td> How can I match just the number 1 from the end of the line of the specified ID, surely there's a way to do this? Help would be highly appreciated.

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• addthis sharing buttons adblocker workaround

  - by Manuel

  I just integrated the addthis sharing buttons into my website. I'd like to use the addthis buttons in reason of their tracking and reporting functionality. However they are blocked by adblock plus and other adblockers. Considering that nowaday 30% of internet users use an adblocker I thought of making a work around for those. I integrated manual sharing buttons into my website. So far so good. Do you have any idea on how to hide my manual sharing buttons if the addthis buttons are shown. Or better said, don't hide them if the addthis buttons are removed by a addblocker? Is it possible to detect an adblocker through js? thx, I really appreciate your help!

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• How to check using a script if project is opened in XCode?

  - by delirus

  Hi, I'd like to introduce build number feature for my iPhone project and increase it automatically with every commit to my git repo. I plan to do it using Apple's agvtool, which recommends that project is not opened in XCode at the time So my questions are: 1) So far I know that I need to make an executable script from .git/hooks/pre-commit.sample. How to do the scripting to check if certain project is opened in XCode? 2) pre-commit.sh will be executed upon calling git commit with no args, so whenever someone will commit with -a option, I won't have my build number updated. Is there any way to workaround this? Cheers

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• Redirecting part of URL in Nginx

  - by Maca

  Trying to move my blog to a new site and I want to redirect some urls. I use nginx. https://blogurl.com/news/2014-08-19/post-3451/mt-preview-33e2742af1eb.php The /news/2014-08-19/post-3451/mt-preview-33e2742af1eb.php part would be always moving. Redirect to below: https://blogurl.com/content/news/2014-08-19/post-3451/mt-preview-33e2742af1eb.php I basically want to insert /content/ after https://blogurl.com and so far I have rewrite ^(.*)$ /content/ break; But my issue is my CMS sits on the same directory level https://blogurl.com/mt/admin and if I simply apply the rewrite above my CMS address would move too. How could I prevent this.

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