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Articles indexed in April 2010

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  • Floating point inaccuracy examples

    - by David Rutten
    How do you explain floating point inaccuracy to fresh programmers and laymen who still think computers are infinitely wise and accurate? Do you have a favourite example or anecdote which seems to get the idea across much better than an precise, but dry, explanation? How is this taught in Computer Science classes?

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  • Webcam streaming in a WPF application

    - by Nebo
    I noticed few similar questions already, but didn't find exatly what I want. I'm trying to do the following. Have a client and server Webcam application. Server application is on a PC with a webcam connected to it and it streams the webcam output. Client application connects to a Server and shows the webcam video. What's the best and easiest way to to this? Are there any libraries or finished projects doing this?

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  • Mac font rendering on Windows

    - by Swap
    Hi, I love the way Mac OS beautifully renders fonts (not just browsers). I was wondering if we could somehow get the same rendering in browsers running on Windows? Someone recommended sIFR but I guess that's useful when I need to use non-standard fonts? -- Swap

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  • C# Custom EventArgs with no constructor?

    - by Motig
    I have a problem; I'm using an external library where one particular event has its own custom eventargs; with no constructor. If I want to throw my own event using these eventargs, how can I? I'll give more detail if asked, but I'm not sure what exactly I should be giving. :)

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  • How can I use Qt to get html code of the redirected page??

    - by Claire Huang
    I'm trying to use Qt to download the html code from the following url: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=nucleotide&cmd=search&term=AB100362 this url will re-direct to www.ncbi.nlm.nih.gov/nuccore/27884304 I try to do it by following way, but I cannot get anything. it works for some webpage such as www.google.com, but not for this NCBI page. is there any way to get this page?? QNetworkReply::NetworkError downloadURL(const QUrl &url, QByteArray &data) { QNetworkAccessManager manager; QNetworkRequest request(url); QNetworkReply *reply = manager.get(request); QEventLoop loop; QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit())); loop.exec(); if (reply->error() != QNetworkReply::NoError) { return reply->error(); } data = reply->readAll(); delete reply; return QNetworkReply::NoError; } void GetGi() { int pos; QString sGetFromURL = "http://www.ncbi.nlm.nih.gov/entrez/query.fcgi"; QUrl url(sGetFromURL); url.addQueryItem("db", "nucleotide"); url.addQueryItem("cmd", "search"); url.addQueryItem("term", "AB100362"); QByteArray InfoNCBI; int errorCode = downloadURL(url, InfoNCBI); if (errorCode != 0 ) { QMessageBox::about(0,tr("Internet Error "), tr("Internet Error %1: Failed to connect to NCBI.\t\nPlease check your internect connection.").arg(errorCode)); return "ERROR"; } }

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  • How do you use jQuery .data() to store html?

    - by Al
    Hi all - when I look up the syntax for .data(), it gives examples like this: $('body').data('foo', 52); I am doing AJAX loads and I was wondering if it is possible to store the incoming html using .data() so once the content is loaded, I would not need to do another AJAX load if the same link is clicked again - I would check to see if the .data key is empty. Would something like this work?: To load the contents of a #ajaxdiv into storage: $('body').data('storage', div#ajaxdiv.html()); To test if the data has already been loaded: if $('body').data('storage') != '' { div#ajaxdiv.html($('body').data('storage')); } Thanks in advance!! Al

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  • Switch-Case for strings in Javascript not working as expected

    - by Coltin
    So I have this problem with strings and switch-case, and I'll try to keep it as simple as possible. Here event.keyCode has the value "65", and is the result of a keydown event of 'a' (using JQuery). if (event.keyCode == "65") { alert("hmmmm"); } That works, but: switch (event.keyCode) { case '65': alert("Yay!"); break; } That doesn't. However this will work: switch ('65') { case '65': alert("Yay!"); break; } And if I do this: var t = '65'; switch (t) { case '65': alert("Yay!"); break; } It works. And then I tried this: var t = event.keyCode; switch (t) { case '65': alert("Yay!"); break; } But it fails! So why does it match in the if-block at the beginning, but not for the switch-case?

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  • Explicit script end tag always converted to self-closing

    - by Jonas
    I'm using xslt to transform xml to an aspx file. In the xslt, I have a script tag to include a jquery.js file. To get it to work with IE, the script tag must have an explicit closing tag. For some reason, this doesn't work with xslt below. <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet version="1.0" xmlns="http://www.w3.org/1999/xhtml" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:msxsl="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="msxsl" xmlns:asp="remove"> <xsl:output method="html"/> <xsl:template match="/"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>TEST</title> <script type="text/javascript" src="jquery-1.2.6.js"></script> But if I change the script tag as shown below, it works. <script type="text/javascript" src="jquery-1.2.6.js"> // <![CDATA[ // ]]> </script> I thought that the <xsl:output method="html" /> would do the trick, but it doesn't seem to work? /Jonas

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  • OpenGL bitmap text fails after drawing polygon

    - by kaykun
    Hi, I'm using Win32 and OpenGL to to draw text onto a window. I'm using the bitmap font method, with wglUseFontBitmaps. Here is my main rendering function: glClear(GL_COLOR_BUFFER_BIT); glPushMatrix(); glColor3f(1.0f, 0.0f, 1.0f); glBegin(GL_QUADS); glVertex2f(0.0f, 0.0f); glVertex2f(128.0f, 0.0f); glVertex2f(128.0f, 128.0f); glVertex2f(0.0f, 128.0f); glEnd(); glPopMatrix(); glPushMatrix(); glColor3f(1.0f, 1.0f, 1.0f); glRasterPos2i(200, 200); glListBase(fontList); glCallLists(5, GL_UNSIGNED_BYTE, "Test."); glPopMatrix(); SwapBuffers(hDC); As you can see it's very simple and the only thing that it's supposed to do is draw a quadrilateral and draw the text "Test.". But the problem is that drawing a polygon seems to mess up any text operations I try to do after it. If I place the text drawing functions before the polygon, both the text and the polygon draw fine. Is there something I'm missing here? Any help is appreciated.

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  • Python -- what is NOT in 2.7 that IS in 3.1? So many things have been back-ported, what is NOT?

    - by StuFuller
    I've been following the saga of Python 3.x and have watched the 3.x features gradually getting back-ported to the 2.x line. Most of the libraries I use haven't been ported and some (e.g. Twisted) seem covertly or overtly hostile to 3.x to varying degrees. At any rate, there has been very little movement towards compatible versions of many of them. Expecially the larger ones. So, my question is, with all the features that have been backported, what is still available in 3.x that's NOT been back-ported? It's pretty easy to find what has been backported, but not what's left. Right now, porting to 3.x just seems like all pain, and I can't see the gain; maybe an "Only in 3.x" list would let me see the light... Thanks, Stu

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  • iphone - gesture not working on animated view

    - by Mike
    I have this animated view and a gesture assigned to it... [self.view setUserInteractionEnabled:YES]; UIImageView *sequence = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"frame0.png"]]; [sequence setUserInteractionEnabled:YES]; sequence.center = CGPointMake(centroX, centroY); NSMutableArray *array = [[NSMutableArray alloc] init] ; for (int i=0; i<30; i++) { UIImage *oneImage = [UIImage imageNamed:[NSString stringWithFormat:@"frame%d.png",i]]; [array addObject:oneImage]; } sequence.animationImages = array; sequence.animationDuration = 1.0; sequence.animationRepeatCount = 1; [self.view addSubview:sequence]; [sequence release]; sequence.startAnimating; sequence.image = [UIImage imageNamed:@"frame29.png"]; // doSomething never runs when I tap the image... why? UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doSomething)]; [singleTap setDelegate:self]; [singleTap setCancelsTouchesInView:NO]; [singleTap setDelaysTouchesEnded:NO]; [sequence addGestureRecognizer:singleTap]; [singleTap release]; The gesture is never called... why? I have no other gesture associated anywhere. thanks for any help.

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  • HA Proxy and Disaster Recovery - Only access server if others are down?

    - by ben2004uk
    Why I expect this is not the best way to solve the problem, I got thinking tonight. I'm thinking about geo-locating servers. Given we have a load balancer + two servers to handle traffic in NA (North America) and one server in the EU. If the two US servers die, is it possible to get HAProxy to direct traffic automatically to the EU one. However, I don't want to use a roundrobin approach for the EU - just the two US ones. The EU should only be hit when the other two are down. Does anyone know how to configure HAProxy to do this? Thanks Ben

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  • Referencing a specific figure in Microsoft Word 2003

    - by stanigator
    Referring to the screenshot below: I want to be able to reference the figure in the body of the text properly without having to change them manually every time I add a figure label before that body of text. However, I don't know how to do it aside from adding caption labels, which won't work for cases where I have more than one reference to the figure (at least I don't know how to do that properly anyway). How would you recommend accomplishing that? Thanks in advance!

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  • XCode: Delete line hot-key

    - by Typeoneerror
    I'm looking for a way to map some hot-keys to "delete the line that my cursor is on" in Xcode. I found "delete to end of line" and "delete to beginning of line" in the text key bindings, but I am missing how to completely delete the line no matter what I have selected. TextMate has this functionality mapped to Ctrl+Shift+D and I'd like the same thing if possible. Any ideas?

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  • XML serializer filename

    - by Alexander
    I want to serialize an object into an xml and I want the filename of the xml to be random as following 636211ad-ef28-47b9-aa60-207d3fbb9580.xml fc3b491e5-59ac-4f6a-81e5-27e971b903ed.xml I am just curious on how to do such thing?

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  • Flash/Flex sending XML to Rails App

    - by bdicasa
    I'm trying to send some XML to a rails app in Flex. I'm using the URLRequest and URLLoader objects. However, I'm having trouble determining how to send the XML and _method parameter to the rails app using these flash objects. Below is how I'm currently trying to achieve this. var request:URLRequest = new URLRequest(); request.method = URLRequestMethod.POST; request.data = new Object(); request.data.xml = Blog.xml.toXMLString(); request.contentType = "text/xml"; var loader:URLLoader = new URLLoader(); loader.addEventListener(Event.COMPLETE, saveCompleteHandler); var saveUrl:String = ""; saveUrl = BASE_URL; if (Blog.isNewBlog) { // Set the rails REST method. request.data._method = "POST"; saveUrl += "blogs.xml"; } else { // Set the rails REST method. request.data._method = "PUT"; saveUrl += "blogs/" + Blog.id.toString() + ".xml"; } request.url = saveUrl; //trace(request.data.toString()); loader.load(request); However the only data that is getting sent to the server is [Object object]. If some one could let me know where I'm going wrong I'd greatly appreciate it. Thanks.

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