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• My OpenGL game switches Aero DWM Glass off.

  - by marc40000

  Hi ! I wrote a free game a few years ago: http://www.walkover.org. For the lobby and menus, it uses normal dialogs like win32. When the actual game starts it uses OpenGL. Now, on Windows 7, when the actual game starts, it switches windows aero glass off and switches it back on when the game is over. Is there something I can do to prevent this from happening? Some special flags that keep the glass on if it is on? (For newer, I have been using DirectX and this doesn#t happen there.) Maybe some (new) flag I have to specify somewhere? Thx Marc

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• Explanation of JAXB error: Invalid byte 1 of 1-byte UTF-8 sequence

  - by Marcus

  We're parsing an XML document using JAXB and get this error: [org.xml.sax.SAXParseException: Invalid byte 1 of 1-byte UTF-8 sequence.] at javax.xml.bind.helpers.AbstractUnmarshallerImpl.createUnmarshalException(AbstractUnmarshallerImpl.java:315) What exactly does this mean and how can we resolve this?? We are executing the code as: jaxbContext = JAXBContext.newInstance(Results.class); Unmarshaller unmarshaller = jaxbContext.createUnmarshaller(); unmarshaller.setSchema(getSchema()); results = (Results) unmarshaller.unmarshal(new FileInputStream(inputFile)); Update Issue appears to be due to this "funny" character in the XML file: ¿ Why would this cause such a problem??

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• NSXMLParser rss issue NSXMLParserInvalidCharacterError

  - by Chris Van Buskirk

  NSXMLParserInvalidCharacterError # 9 This is the error I get when I hit a weird character (like quotes copied and pasted from word to the web form, that end up in the feed). The feed I am using is not giving an encoding, and their is no hope for me to get them to change that. This is all I get in the header: < ?xml version="1.0"? < rss version="2.0" What can I do about illegal characters when parsing feeds? Do I sweep the data prior to the parse? Is there something I am missing in the API? Has anyone dealt with this issue?

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• Why are primes important in cryptography?

  - by Michael Stum

  One thing that always strikes me as a non-cryptographer: Why is it so important to use Prime numbers? What makes them so special in cryptography? Does anyone have a simple short explanation? (I am aware that there are many primers and that Applied Cryptography is the Bible, but as said: I am not looking to implement my own cryptographic algorithm, and the stuff that I found just made my brain explode - no 10 pages of math formulas please :)) Thanks for all the answers. I've accepted the one that made the actual concept most clear to me.

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• Code Golf: Seven Segments

  - by LiraNuna

  The challenge The shortest code by character count to generate seven segment display representation of a given hex number. Input Input is made out of digits [0-9] and hex characters in both lower and upper case [a-fA-F] only. There is no need to handle special cases. Output Output will be the seven segment representation of the input, using those ASCII faces: _ _ _ _ _ _ _ _ _ _ _ _ | | | _| _| |_| |_ |_ | |_| |_| |_| |_ | _| |_ |_ |_| | |_ _| | _| |_| | |_| _| | | |_| |_ |_| |_ | Restrictions The use of the following is forbidden: eval, exec, system, figlet, toilet and external libraries. Test cases: Input: deadbeef Output: _ _ _ _ _ _||_ |_| _||_ |_ |_ |_ |_||_ | ||_||_||_ |_ | Input: 4F790D59 Output: _ _ _ _ _ _ |_||_ ||_|| | _||_ |_| || | _||_||_| _| _| Code count includes input/output (i.e full program).

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• MPI: is there mpi libraries capable of message compression?

  - by osgx

  Sometimes MPI is used to send low-entropy data in messages. So it can be useful to try to compress messages before sending it. I know that MPI can work on very fast networks (10 Gbit/s and more), but many MPI programs are used with cheap network like 0,1G or 1Gbit/s Ethernet and with cheap (slow, low bisection) network switch. There is a very fast Snappy (wikipedia) compression algorithm, which has Compression speed is 250 MB/s and decompression speed is 500 MB/s so on compressible data and slow network it will give some speedup. Is there any MPI library which can compress MPI messages (at layer of MPI; not the compression of ip packets like in PPP). MPI messages are also structured, so there can be some special method, like compression of exponent part in array of double.

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• Error in Jaclplus component

  - by Aruna

  Hi, I am working on Joomla 1.5 and our site is using the Bluehost server.Till March 9th, 2010 our site was working perfectly.And on March 10th,2010 , the following error was shown in the site as Warning: Unexpected character in input: '' (ASCII=28) state=1 in /home1/tcscoinc/public_html/tcsrnd/administrator/components/com_jaclplus/jac lplus.class.php on line 73 Parse error: syntax error, unexpected T_STRING in /home1/tcscoinc/public_html/tcsrnd/administrator/components/com_jaclplus/jac lplus.class.php on line 73 For time being, i have just renamed the file jaclplus.class.php to make the site to function. As we are using Jaclplus component and we have purchased the Jaclplus component from Byos Tech , i have checked in the membership details.And we found that our Membership has been expired on 03/10/2010 . I have asked them but they had replied that it may not be a problem on membership. Please anyone share what can be the reason for the error.I am not able to open that file(jaclplus.class.php) since its a binary file.

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• Web/HTML: how do referrer work technically?

  - by NoozNooz42

  I don't understand how comes webserver and trackers like Google Analytics are able to track referrals. Is it part of HTTP? Is it some (un)specified behavior of the browsers? Apparently everytime you click on a link on a webpage, the original webpage is passed along the request. What is the exact mechanism behind that? Is it specified by some spec? I've read a few docs and I've played with my own Tomcat server and my own Google Analytics account, but I don't understand how the "magic" happens. Bonus (totally related) question: if, on my own website (served by Tomcat), I put a link to another site, does the other site see my website as the "referrer" without me doing anything special in Tomcat?

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• Creating a short unique string for each unique long string

  - by king.net

  I'm trying to create a url shortener system in c# and asp.net mvc. I know about hashtable and I know how to create a redirect system etc. The problem is indexing long urls in database. Some urls may have up to 4000 character length, and it seems it is a bad idea to index this kind of strings. The question is: How can I create a unique short string for each url? for example MD5 can help me? Is MD5 really unique for each string? NOTE: I see that Gravatar uses MD5 for emails, so if each email address is unique, then its MD5 hashed value is unique. Is it right? Can I use same solution for urls?

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• Python re.sub MULTILINE caret match

  - by cdleary

  The Python docs say: re.MULTILINE: When specified, the pattern character '^' matches at the beginning of the string and at the beginning of each line (immediately following each newline)... By default, '^' matches only at the beginning of the string... So what's going on when I get the following unexpected result? >>> import re >>> s = """// The quick brown fox. ... // Jumped over the lazy dog.""" >>> re.sub('^//', '', s, re.MULTILINE) ' The quick brown fox.\n// Jumped over the lazy dog.'

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• Automatic camera calibration

  - by srand

  From Wikipedia, camera resectioning is the process of finding the true parameters of the camera that produced a given photograph or video. Camera resectioning is also known as geometric camera calibration. Currently I am using Camera Calibration Toolbox for Matlab for my camera calibration. The toolbox returns calibration parameters such as focal length, principle point, skew, and distortion. However, the issue with this method is that it requires an extra step in calibrating the camera by using a special calibration object like a checkerboard. Additionally, it only works for one focus of the camera. How can I get the calibration parameters without manually calibrating? For example, how does Microsoft's Photosynth perform camera calibration on its images?

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• Code Golf Christmas Edition: How to print out a Christmas tree of height N

  - by TheSoftwareJedi

  Given a number N, how can I print out a Christmas tree of height N using the least number of code characters? N is assumed constrained to a min val of 3, and a max val of 30 (bounds and error checking are not necessary). N is given as the one and only command line argument to your program or script. All languages appreciated, if you see a language already implemented and you can make it shorter, edit if possible - comment otherwise and hope someone cleans up the mess. Include newlines and whitespace for clarity, but don't include them in the character count. A Christmas tree is generated as such, with its "trunk" consisting of only a centered "*" N = 3: * *** ***** * N = 4: * *** ***** ******* * N = 5: * *** ***** ******* ********* * N defines the height of the branches not including the one line trunk. Merry Christmas SO!

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• Discrete mathematics problem - Probability theory and counting

  - by Mohammad

  Hello All, I'm taking a discrete mathematics course, and I encountered a question and I need your help. I don't know if this is the right place for that though :) It says: Each user on a computer system has a password, which is six to eight characters long, where each character is an uppercase letter or a digit. Each password must contain at least one digit. How many possible passwords are there? The book solves this by adding the probabilities of having six,seven and eight characters long password. However, when he solves for probability of six characters he does this P6 = 36^6 - 26^6 and does P7 = 36^7 - 26^7 and P8 = 36^8 - 26^8 and then add them all I understand the solution, but my question is why doesn't calculating, P6 = 10*36^5 and the same for P7 and P8, work? 10 for the digit and 36 for the alphanumeric? Also, if anyone could give me another solution, other than the one in the book. Thank you very much :)

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• How to split a path platform independent?

  - by Janusz

  I'm using the following code to get an array with all sub directories from a given path. String[] subDirs = path.split(File.separator); I need the array to check if certain folders are at the right place in this path. This looked like a good solution until findBugs complains that File.separator is used as a regular expression. It seems that passing the windows file separator to a function that is building a regex from it is a bad idea because the backslash being an escape character. How can I split the path in a cross platform way without using File.separator? Or is code like this okay? String[] subDirs = path.split("/");

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• Using two namespaces when defining a new xml file (XDocument, XElement, XAttribute)

  - by Manchuwook

  XNamespace xnRD = "http://schemas.microsoft.com/SQLServer/reporting/reportdesigner"; XNamespace xnNS = "http://schemas.microsoft.com/sqlserver/reporting/2008/01/reportdefinition"; XAttribute xaRD = new XAttribute(XNamespace.Xmlns + "rd", xnRD); XAttribute xaNS = new XAttribute("xmlns", xnNS); XElement x = new XElement("Report", xaRD, xaNS, new XElement("DataSources"), new XElement("DataSets"), new XElement("Body"), new XElement("Width"), new XElement("Page"), new XElement("ReportID", xaRD), new XElement("ReportUnitType", xaRD) ); XDocument doc = new XDocument(new XDeclaration("1.0", "utf-8", "yes")); doc.Add(x); Console.WriteLine(doc.ToString()); Results in runtime error: {"The prefix '' cannot be redefined from '' to 'http://schemas.microsoft.com/sqlserver/reporting/2008/01/reportdefinition' within the same start element tag."} What I am trying to do is just make the DataSources and DataSets write out to the Debug.Console to build ObjectDataSources since VS2010 neglected to add them for ASPX. EDIT: new XElement(xaRD + "ReportID"), new XElement(xaRD + "ReportUnitType") Changed and got : Additional information: The ':' character, hexadecimal value 0x3A, cannot be included in a name. Instead

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• bash tips needed for understanding how to escape characters in command-line

  - by Jesper Rønn-Jensen

  My knowledge of commandline bash is missing on a particular area: I constantly forget how to properly escape characters. Today I wanted to echo this string into a file: #!/bin/env bash python -m SimpleHTTPServer echo "#!/bin/env bash\npython -m SimpleHTTPServer" server.sh && chmod +x server.sh -bash: !/bin/env: event not found That's right: Remember to escape ! or bash will think it's a special bash event command. But I can't get the escaping right! \! yields \! in the echoed string, and so does \\!. Furthermore, \n will not translate to a line break. Do you have some general tips that makes it easier for me to understand escaping rules? To be very precise, I'll accept an answer which tells me which characters I should escape on the bash command line? Including how to correctly output newline and exclamation mark in my example.

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• HttpWebRequest socket operation during WPF binding in a property getter

  - by wpfwannabe

  In a property getter of a C# class I am doing a HTTP GET using HttpWebRequest to some https address. WPF's property binding seems to choke on this. If I try to access the property in a simple method e.g. Button_Clicked, it works perfectly. If I use WPF binding to access the same property, the app seems to be blocked on a socket's recv() method indefinitely. Is it a no-no to do this sort of thing during binding? Is app in some special state during binding? Is there an easy way for me to overcome this limitation and still maintain the same basic idea?

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• CruiseControl Console error message when parsing XML

  - by jarad

  I have CruiseControl(1.5) running in Win2k8R2 and svn(1.6.9) The error happens on a successful build after nant(0.86) Timeout(600 seconds). When I check the build dir everything is built correctly but CruiseControl Dashboard report Exception Here is the error shown in console: [:DEBUG] Exception: System.Xml.XmlException: The ',' character, hexadecimal value 0x2C, cannot be included in a name. Line 5544, position 274. at System.Xml.XmlTextReaderImpl.Throw(Exception e) at System.Xml.XmlTextReaderImpl.ParseElement() at System.Xml.XmlTextReaderImpl.ParseDocumentContent() at System.Xml.XmlWriter.WriteNode(XmlReader reader, Boolean defattr) at ThoughtWorks.CruiseControl.Core.Util.XmlFragmentWriter.WriteNode(XmlReader reader, Boolean defattr) at ThoughtWorks.CruiseControl.Core.Util.XmlFragmentWriter.WriteNode(String xml)

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• Updatepanel refresh messing up JqueryUI in IE7

  - by o-logn

  Hey everyone, This is a bit of a long shot as I don't have access to the code at the moment. However, there's nothing 'special' about the code. I'm using a combination of JqueryUI and ASP.NET UpdatePanels. If I click any of the trigger controls (asp.net button), the partial-postbacks are fine. However, if I click on a trigger control after clicking on a JQueryUI button, then the entire layout messes up and a lot of the content moves upwards. I can just about reach a JQueryUI button, and when I click that, the layout returns to normal and everything's fine until I click the trigger control again. The page works fine in all latest browsers, but this problem appears in IE 7. I hope maybe someone has come across a similar problem in IE 7 and found a workaround/solution. I've been trying to fix it for a couple of days, but no luck. Thanks for any advice.

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• What is the right license for tutorial source code ?

  - by devdude

  Putting sourcecode from tutorials or books online requires the author to add some kind of disclaimer or license (otherwise people would use it make lots of $$$ or break a power plant IT control system and sue you as author). But what is the right license or disclaimer statement ? Can I use BSD license with ... IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,... We are talking about tutorials ! Released to teach and share knowledge. Or do I need to follow the (potentially different) licenses of the libraries I use ? Might be insignificant now but I feel we will face a license hunt in "public" sourcecode (aka OSS) in future, similar to companies/lawyers currently crawling the web for pictures with wrong copyright statement or infringing their IP (and suing someone using a picture in a personal blog,etc..).

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• Why does localization with resx files fail with ZH (chinese) only?

  - by Trey Carroll

  Howdy All, I've been tasked with localizing an English language ASP.NET MVC 2.0 website into 7 additional languages. I've added resource files to the Views Home App_LocalResources folder: Example: Index.resx, Index.es.resx, Index.fr.resx, Index.zh.resx, etc. I have set the CustomTool to PublicResXFileCodeGenerator (Access modifier is Public), Set file as an Embedded Resource, Set a Custom Tool Namespace. The keys ("Name") in all of the files are the same. For 7 languages this works perfectly. If I go into IE 8 settings and change the language to de,fr,it, etc., the page shows the appropriate translated strings. However, when I set the language in the Browser to any of the zh (Simplified Chinese) variants localization completely fails and the English strings are displayed. Is there something special about Simplified Chinese? Japanese and Korean work without problems. TIA, Trey Carroll

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• How can HTML5 "replace" Flash?

  - by Kassini

  A topic of debate that's seen a resurgence since the unveiling of the iPad is the issue of Flash versus HTML5. There are those that suggest that HTML5 will one day supplant/replace Adobe Flash. I do not develop software that runs in a browser, so my (limited) understanding is: HTML is a pure-text markup language that is delivered over HTTP to a client browser. The client browser interprets the markup and renders (with varying degrees of success) the page according to an standard specification. Adobe Flash is a propriety framework for working with audio, video, sound and raster/vector graphics. It requires special authoring tools (a compiler perhaps?) and a custom player that's available as a plug-in to most common browsers. Could someone please explain (to this C/C++ developer) how it is possible from a technical/coding point-of-view that a text-based markup language (HTML5) could be considered a replacement to a multimedia framework (Flash)? Please no opinionated arguments - just technical facts.

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• PHP-GD: Dealing with Unicode characters

  - by sehugg

  I am developing a web service that renders characters using the PHP GD extension, using a user-selected TTF font. This works fine in ASCII-land, but there are a few problems: The string to be rendered comes in as UTF-8. I would like to limit the list of user-selectable fonts to be only those which can render the string properly, as some fonts only have glyphs for ASCII characters, ISO 8601, etc. In the case where some decorative characters are included, it would be fine to render the majority of characters in the selected font and render the decorative characters in Arial (or whatever font contains the extended glyphs). It does not seem like PHP-GD has support for querying the font metadata sufficiently to figure out if a character can be rendered in a given font. What is a good way to get font metrics into PHP? Is there a command-line utility that can dump in XML or other parsable format?

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• How do I allow inline images with data urls on .NET 4 without triggering request validation?

  - by Johan Driessen

  I'm using the jQuery jstree plugin (http://jstree.com) in a ASP.NET MVC 2 project on .NET 4 RC. It comes with some stylesheets with inline images with data urls, like this: .tree-checkbox ul { background-image:url(data:image/gif;base64,R0lGODlhAgACAIAAAB4dGf///yH5BAEAAAEALAAAAAACAAIAAAICRF4AOw==); } Now, the url for the background image contains a colon, which .NET 4 thinks is an unsafe character, so I get this error message: A potentially dangerous Request.Path value was detected from the client (:). According to the documentation, I am supposed to be able to prevent this by adding <pages validateRequest="false" /> to my Web.config, but that doesn't seem to help. I have tried adding it to the main Web.config for the application, as well as to a special Web.config in the /config folder, but to no avail. Is there any way to get .NET to allow this?

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• WCF Deserialization Error

  - by BK

  ERROR - Exception: System.ServiceModel.Dispatcher.NetDispatcherFaultException Message: The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter services.gmrlive.com/JupiterMobile/2009/01/01/:StatusDetails. The InnerException message was 'There was an error deserializing the object of type X.X.X.Entities.StatusDetailCollection. Name cannot begin with the '5' character, hexadecimal value 0x35. Line 12, position 45.'. I am tracing the wcf logs but i am unable to see the actual xml message. It fails to log the malformed message. Can anyone help?

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