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• nginx with passenger

  - by Luc

  Hello, I'm trying to move from Apache + Passenger to Nginx + passenger on my Ubuntu Lucid Lynx box. When I install passenger, sudo gem install passenger and cd /var/lib/gems/1.9.1/gems/passenger-2.2.14/bin sudo ./passenger-install-nginx-module everything is fine (no error). Nginx is downloaded / compiled and installed at the same time (when selecting the first option during passenger installation). By default it is installed in /opt/nginx. I end up with the configuration file /opt/nginx/conf/nginx.conf (this conf file was automatically updated with passenger config). The thing I do not understand is that I also have the configuration file /etc/nginx/nginx.conf... what is the purpose of this one when it seems that the conf file in /opt/... is the main one ? When I run /etc/init.d/nginx start, it starts correclty saying that /etc/nginx/nginx.conf is ok... Does it mean that it does not check the other conf file ? I have updated /etc/init.d/nginx script and add /opt/nginx/sbin at the beginning of the PATH and it seems the correct conf file is taken into account. It seems like I have 2 nginx installations where I only relied on passenger to install it... Thanks a lot for your help, I am kind of lost here :) Luc

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• Recursive Perl detail need help

  - by Catarrunas

  Hi everybody, i think this is a simple problem, but i'm stuck with it for some time now! I need a fresh pair of eyes on this. The thing is i have this code in perl: #!c:/Perl/bin/perl use CGI qw/param/; use URI::Escape; print "Content-type: text/html\n\n"; my $directory = param ('directory'); $directory = uri_unescape ($directory); my @contents; readDir($directory); foreach (@contents) { print "$_\n"; } #------------------------------------------------------------------------ sub readDir(){ my $dir = shift; opendir(DIR, $dir) or die $!; while (my $file = readdir(DIR)) { next if ($file =~ m/^\./); if(-d $dir.$file) { #print $dir.$file. " ----- DIR\n"; readDir($dir.$file); } push @contents, ($dir . $file); } closedir(DIR); } I've tried to make it recursive. I need to have all the files of all of the directories and subdirectories, with the full path, so that i can open the files in the future. But my output only returns the files in the current directory and the files in the first directory that it finds. If i have 3 folders inside the directory it only shows the first one. Ex. of cmd call: "perl readDir.pl directory=C:/PerlTest/" Thanks

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• HTTP Error 500.19 Internal Server Error

  - by Attilah

  I created and deployed a pretty simple WCF Service. but when accessing it from IE, I get this : HTTP Error 500.19 - Internal Server Error Description: The requested page cannot be accessed because the related configuration data for the page is invalid. Error Code: 0x80070005 Notification: BeginRequest Module: IIS Web Core Requested URL: http://localhost:80/ProductsService/ProductsService.svc Physical Path: C:\Users\Administrator\Documents\Visual Studio 2008\Projects\ProductsService\ProductsService\ProductsService.svc Logon User: Not yet determined Logon Method: Not yet determined Handler: Not yet determined Config Error: Cannot read configuration file Config File: \\?\C:\Users\Administrator\Documents\Visual Studio 2008\Projects \ProductsService\ProductsService\web.config Config Source: -1: 0: More Information... This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error. here is the content of my web.config file : <?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </configSections> <dataConfiguration defaultDatabase="AdventureWorksConnection" /> <connectionStrings> <add name="AdventureWorksConnection" connectionString="Database=AdventureWorks; Server=(localhost)\SQLEXPRESS;Integrated Security=SSPI" providerName="System.Data.SqlClient" /> </connectionStrings> <system.serviceModel> <services> <service name="Products.ProductsService"> <endpoint address="" binding="basicHttpBinding" contract="Products.IProductsService" /> </service> </services> </system.serviceModel> </configuration>

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• Force compile-time linking of all classes in a SWC

  - by aaaidan

  Using Flash CS4, I am making a game that has a dozen or so sounds and a couple of music tracks. To cut down on publish/compile time, I have moved the sounds and music into an (external) SWC, which is located in a "Library Path" for the project. This works, but with a caveat... Until before I externalised the assets, I had been dynamically instantiating the Sound objects of the embedded sound by getting their classes with getDefinitionByName. // something like... var soundSubClass:Class = Class(getDefinitionByName(soundClassName)); var mySound:Sound = new soundSubClass(); But now that they're located in an external SWC, I need to have "concrete" references to the classes in order to load them like this, otherwise they are not included in the published SWF, and there is a runtime error when getDefinitionByName tries to get a class that doesn't exist. So, my question: in Flash Professional CS4, is there any way to force a library's assets to be included, regardless of whether they are statically linked? FlashDevelop has a compiler option "SWC Include Libraries", which is exactly what I want, and is distinct from the "SWC Libraries" option. The description of the "SWC Include Libraries" option is "Links all classes inside a SWC file to the resulting application SWF file, regardless of whether or not they are used." (Also, it's important to me that all the assets are contained within the one compiled SWF. Linking at runtime isn't what I'm after.)

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• Documentation and Build system for Mono/C#

  - by dcolish

  I'm starting out on a new project and a team member has decided to use C# as the implementation language. I don't have a lot of experience in C#, but a brief reading shows that it's very capable of being a complete cross-platform vm. Beyond the language, I've been having trouble selecting tools and workflows for managing the code as the project grows. It should be fairly small (<10K lines) but I would like to have the ability to generate documentation as the project grows, manage any external dependencies that we decide to use, and automate builds and testing. I am wondering what tools are commonly used or considered best practices for this language. I am mainly concerned with how would a build system potentially work on *nix as well as windows? Are there C# specific tools or is Make more common? In addition, I'd like to use a dvcs, but it doesn't look like Visual Studio and MonoDevelop support the same ones. What's the common vcs of choice for C#? For testing sort of Unit testing is available for C#/Mono? Finally, I know that there are good doc generators, but with the question of the build system, I would really like to have that just be a single step in the build similar to how testing is a step. Normally I'd automate with Hudson, but I am wondering if there is something more specific to the platform. Overall, I'd love to see a solution that provides a decent workflow on both windows and *nix without a heavy admin burden. I am pretty sure this is the holy grail of project management, so anything that puts me on that path is awesome.

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• Enable cross app redirects

  - by Gogster

  Hi all, We have load balancing set up on out two web server, however, a few users are being asked to login when they are being re-directed to a particular server to upload a document (we are trying to keep all uploaded documents on one server only), here is the code from web.config: <authentication mode="Forms"> <forms name="EAAAuthCookie" loginUrl="/login" defaultUrl="/members/home" protection="All" path="/" timeout="60000" slidingExpiration="true" enableCrossAppRedirects="true" /> </authentication> <machineKey decryption="AES" validation="SHA1" decryptionKey="7B4EC5B0C83631DF25D5B179EDDBF91B1C175B81C6F52102267D3D097FBF272A" validationKey="7D1F50788629CC342EE4985D85DE3D14F10654695912C0FFD439F54BED64F76A57A2D5E8180BC6FF052E0385C30558F5527D6C197C577A7F32DD8FF1CAC9F794" /> Here is the transfer code to the upload form: $('#addReport').click(function() { if ($.cookie('TransferURL') != '') { $("#iframeUploadReport").attr('src', $.cookie('TransferURL')); }; $('#overlay').fadeIn('slow'); }); <script type="text/C#" runat="server"> void Page_Load() { string cookieName = FormsAuthentication.FormsCookieName; string userName = Request.Cookies["HiddenUsername"].ToString(); string cookieValue = FormsAuthentication.GetAuthCookie(userName, false).Value; Response.Cookies["TransferURL"].Value = "http://eaa.cms.necinteractive.net/members/media-upload" + String.Format("?{0}={1}", cookieName, cookieValue); } </script> <iframe id="iframeUploadReport" src="http://eaa.cms.necinteractive.net/members/media-upload" width="500px" height="336px" frameborder="0" scrolling="no"></iframe> Can you see any obvious step we are missing? Thanks

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• Getting Safari document title/location with Scripting Bridge does not work in full-screen mode

  - by Mark

  I'm trying to get the URL and document title from the topmost Safari document/tab. I have an AppleScript and an objective-c version using Apple's Scripting Bridge framework. Both versions work fine for most web pages, however when I open a Youtube video in full-screen mode, the Scripting Bridge based version fails. The Apple Script works fine for "normal" and full-screen Safari windows. Can anyone see what is wrong with the Scripting Bridge code below to cause it to fail for full-screen Safari windows? Here the code (I omitted error checking for brevity): AppleScript: tell application "Safari" # Give us some time to open video in full-screen mode delay 10 do JavaScript "document.title" in document 0 end tell Scripting Bridge: SafariApplication* safari = [SBApplication applicationWithBundleIdentifier:@"com.apple.Safari"]; SBElementArray* windows = [safari windows]; SafariTab* currentTab = [[windows objectAtIndex: 0] currentTab]; // This fails when in full-screen mode: id result = [safari doJavaScript: @"document.title" in: currentTab]; NSLog(@"title: %@", result); Scripting Bridge error (with added line breaks): Apple event returned an error. Event = 'sfri'\'dojs'{ '----':'utxt'("document.title"), 'dcnm':'obj '{ 'want':'prop', 'from':'obj '{ 'want':'cwin', 'from':'null'(), 'form':'indx', 'seld':1 }, 'form':'prop', 'seld':'cTab' } } Error info = { ErrorNumber = -1728; ErrorOffendingObject = <SBObject @0x175c2de0: currentTab of SafariWindow 0 of application "Safari" (238)>; } I could not find details about the given error code. It complains about 'currentTab' which shows that the JavaScript event at least made it all the way to Safari. I assume that the current tab receives the event, but refuses to run the JS code, because it is in full-screen mode. However, why does this work for an AppleScript? Don't they use the same code path eventually? Any suggestions are greatly appreciated. Thanks!

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• GMail appearing to ignore Reply-To.

  - by Samuurai

  I'm using a gmail account to send emails from my website. I'm using the same account to pick up emails which are generated by the contact facility on my site. I'm using the Reply-To field to attempt to make it easier to hit reply and easily get back to people. The message comes up with the 'from' address and ignores the 'reply-to' address. Here's my header: Return-Path: <[email protected]> Received: from svr1 (ec2-79-125-266-266.eu-west-1.compute.amazonaws.com [79.125.266.266]) by mx.google.com with ESMTPS id u14sm23273123gvf.17.2010.03.10.14.33.24 (version=TLSv1/SSLv3 cipher=RC4-MD5); Wed, 10 Mar 2010 14:33:25 -0800 (PST) Received: from localhost ([127.0.0.1] helo=www.rds.com) by aquacouture with esmtp (Exim 4.69) (envelope-from <[email protected]>) id 1NpUSx-0001dK-JM for [email protected]; Wed, 10 Mar 2010 22:33:23 +0000 User-Agent: CodeIgniter Date: Wed, 10 Mar 2010 22:33:23 +0000 From: "New Inquiry" <[email protected]> Reply-To: "Beren" <[email protected]> To: [email protected] Subject: =?utf-8?Q?Test?= X-Sender: [email protected] X-Mailer: CodeIgniter X-Priority: 3 (Normal) Message-ID: <[email protected]> Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="B_ALT_4b981e3390ccd" This is a multi-part message in MIME format. Your email application may not support this format. --B_ALT_4b981e3390ccd Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit test --B_ALT_4b981e3390ccd Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable test --B_ALT_4b981e3390ccd--

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• Updating a Minimum spanning tree when a new edge is inserted

  - by Lynette

  Hello, I've been presented the following problem in University: Let G = (V, E) be an (undirected) graph with costs ce = 0 on the edges e € E. Assume you are given a minimum-cost spanning tree T in G. Now assume that a new edge is added to G, connecting two nodes v, tv € V with cost c. a) Give an efficient algorithm to test if T remains the minimum-cost spanning tree with the new edge added to G (but not to the tree T). Make your algorithm run in time O(|E|). Can you do it in O(|V|) time? Please note any assumptions you make about what data structure is used to represent the tree T and the graph G. b)Suppose T is no longer the minimum-cost spanning tree. Give a linear-time algorithm (time O(|E|)) to update the tree T to the new minimum-cost spanning tree. This is the solution I found: Let e1=(a,b) the new edge added Find in T the shortest path from a to b (BFS) if e1 is the most expensive edge in the cycle then T remains the MST else T is not the MST It seems to work but i can easily make this run in O(|V|) time, while the problem asks O(|E|) time. Am i missing something? By the way we are authorized to ask for help from anyone so I'm not cheating :D Thanks in advance

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• Windows Azure ASP.NET MVC Role behaves strangely when redirecting from HTTP to HTTPS

  - by Rinat Abdullin

  Subj. I've got an ASP.NET 2 MVC Worker Role Application, that does not differ much from the default template. When attempting redirect from HTTP to HTTPS (this happens when we access constroller secured by the usual RequireSSL attribute implementation) we get blank page with "Bad Request" message. IntelliTrace shows this: Thrown: "The file '/Views/Home/LogOnUserControl.aspx' does not exist." (System.Web.HttpException) Call stack is really short: [External Code] App_Web_vfahw7gz.dll!ASP.views_shared_site_master.__Render__control1(System.Web.UI.HtmlTextWriter __w = {unknown}, System.Web.UI.Control parameterContainer = {unknown}) [External Code] App_Web_bsbqxr44.dll!ASP.views_home_index_aspx.ProcessRequest(System.Web.HttpContext context = {unknown}) [External Code] User control reference is the usual one in /Views/Shared/Site.Master: <div id="logindisplay"> <% Html.RenderPartial("LogOnUserControl"); %> </div> And partial view LogOnUserControl.ashx is located in Views/Shared (and it is ASHX, not ASPX). Problem shows up, when we try to access site pages, that require auth and redirect. These pages are secured by RequireSSL attribute (Redirect == true): [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = false)] public sealed class RequireSslAttribute : FilterAttribute, IAuthorizationFilter { public bool Redirect { get; set; } // Methods public void OnAuthorization(AuthorizationContext filterContext) { // this get's messy, when we are running custom ports // within the local dev fabric. // hence we disable code in the debug #if !DEBUG if (filterContext == null) { throw new ArgumentNullException("filterContext"); } if (filterContext.HttpContext.Request.IsSecureConnection) return; var canRedirect = string.Equals(filterContext.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase); if (canRedirect && Redirect) { var builder = new UriBuilder { Scheme = "https", Host = filterContext.HttpContext.Request.Url.Host, Path = filterContext.HttpContext.Request.RawUrl }; filterContext.Result = new RedirectResult(builder.ToString()); } else { throw new HttpException(0x193, "Access forbidden. The requested resource requires an SSL connection."); } #endif } } Obviously we compile in RELEASE for this case. Does anybody have any idea, what could cause this strange exception and how to get rid of it?

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• WPF: Invert OpacityMask

  - by Meleak

  Consider the following piece of Xaml <Grid Background="Blue"> <Border Width="100" Height="60" BorderBrush="Black" BorderThickness="2"> <Border Background="Red"> <Border.OpacityMask> <VisualBrush> <VisualBrush.Visual> <TextBlock Text="Text" Foreground="#FF000000" Background="#00000000"/> </VisualBrush.Visual> </VisualBrush> </Border.OpacityMask> </Border> </Border> </Grid> It will look like this because of the OpacityMask whos only non-transparent part is the Foreground of the TextBlock. Now if I switch the Colors for Foreground and Background in the TextBlock like this <TextBlock Text="Text" Foreground="#00000000" Background="#FF000000"/> I get this because the even though the Foreground is transparent the Background behind it is not, resulting in a useless OpacityMask :) Is there anyway I can get this? Basically an inverted OpacityMask The reason I'm asking this is because of the answer I made in this question, using the approach from this link. Even though it works, it feels very "hacky". Am I missing some other way to do this here? Update To clarify, even though my example is about a TextBlock, it could be anything. Ellipse/Image/Path etc. The feature I'm after is "Invert OpacityMask"

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• Intelligent web features, algorithms (people you may follow, similar to you ...)

  - by hilal

  I have 3 main questions about the algorithms in intelligent web (web 2.0) Here the book I'm reading http://www.amazon.com/Algorithms-Intelligent-Web-Haralambos-Marmanis/dp/1933988665 and I want to learn the algorithms in deeper 1. People You may follow (Twitter) How can one determine the nearest result to my requests ? Data mining? which algorithms? 2. How you’re connected feature (Linkedin) Simply algorithm works like that. It draws the path between two nodes let say between Me and the other person is C. Me - A, B - A connections - C . It is not any brute force algorithms or any other like graph algorithms :) 3. Similar to you (Twitter, Facebook) This algorithms is similar to 1. Does it simply work the max(count) friend in common (facebook) or the max(count) follower in Twitter? or any other algorithms they implement? I think the second part is true because running the loop dict{count, person} for person in contacts: dict.add(count(common(person))) return dict(max) is a silly act in every refreshing page. 4. Did you mean (Google) I know that they may implement it with phonetic algorithm http://en.wikipedia.org/wiki/Phonetic_algorithm simply soundex http://en.wikipedia.org/wiki/Soundex and here is the Google VP of Engineering and CIO Douglas Merrill speak http://www.youtube.com/watch?v=syKY8CrHkck#t=22m03s What about first 3 questions? Any ideas are welcome ! Thanks

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• Unregistering COM dll with a C# Setup Project

  - by lb

  Hi All. I've been stuck on this one for a while. I'll try explain in the simplest terms and at the best of my knowledge. I will honour any help. I've got a C# project which uses a VB6 compiled ActiveX DLL that I'm constantly updating. I compile the setup project, send it to the client and they run the setup. When building the updated setup project, I would increase the 'Version' of the setup project so it wouldn't bother with 'Another version is already installed'. What started happening after a few updates I began to notice the DLL would not be updated to the new version in the installer. The client computer had the original DLL both installed and registered. First symptom: method not found exceptions from the client C# code. This is not a shared DLL and only this application needs it. I've noticed that when uninstalling the application (through the usual procedure) the DLL is also not removed from the application folder although I would set this file's property 'Permanent' to false. The registration entries in the registry are mantained also. I do update in VS6.0 the version of the DLL (usually increase the build number) before building it. Then in VS2008, I remove it from the References, and add it again from the 'Browse tab', without re-registering it on my dev machine and adding it from the COM tab. I've thought of these options. Custom step in Setup project to regsvr32.exe /u 'hardcoded path of my dll' at uninstall (ugly) Somehow find out how the 'Isolate' property can work for me without registering Find out how to execute setup project 'Conditions' that would actually check the version of the library and to update the file accordingly at every install) Any help would be incredibly welcome.

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• Database version is zero on initial install

  - by mahesh

  I have released an app (World Time) with initial database. Now i want to update the app with a database upgrade. I have put in the upgrade code in OnUpgrade() and checking for the newVersion. But it was not being called in my local testing... So i put in the debug statement to get the database version and it is zero . Any idea why it is not being versioned ? Following is the code to copy the database from my Assets folder ... InputStream myInput = myContext.getAssets().open(DB_NAME); // Path to the just created empty db String outFileName = DB_PATH + DB_NAME; //Open the empty db as the output stream OutputStream myOutput = new FileOutputStream(outFileName); //transfer bytes from the inputfile to the outputfile byte[] buffer = new byte[1024]; int length; while ((length = myInput.read(buffer))>0){ myOutput.write(buffer, 0, length); } //Close the streams myOutput.flush(); myOutput.close(); myInput.close(); -- Mahesh http://android.maheshdixit.com

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• Silverlight Data Access - how to keep the gruntwork on the server

  - by akaphenom

  What technologies are used / recommended for HTTP Rpc Calls from Silverlight. My Server Side stack is JBoss (servlets / json_rpc [jabsorb]), and we have a ton of business logic (object creation, validation, persistence, server side events) in place that I still want to take advantage of. This is our first attempt at bringing an applet style ria to our product, and ideally we keep both HTML and Silverlight versions. For better or worse the powers that be have pushed us down the silverlight path, and while flex / java fx / silverlight is an interesting debate, that question is removed from the equation. We just have to find a way to get silverlight to behave with our classes. Should I be defining .NET Class representation of our JSON objects and the methodology to serialize / deserialize access to those objects? IE "blah.com/dispenseRpc?servlet=xxxx&p1=blah&p2=blahblah creating functions that invoke the web request and convert the incomming response string to objects? Another way would be to reverse engineer the .NET wcf(or whatever) communications and implement the handler on the Java side that invokes the correct server side code and returns what .NET expects back. But that sounds much trickier. T

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• How to configure oracle instantclient for mono?

  - by funwithcoding

  Mono is really awesome. Some of our applications worked in linux out of the box even without recompiling the binary. However I am having tough time to configure oracle instantclient to use it with mono. I installed instantclient on a CentOS VM(by installing instantclient rpm) but however I did not find TNSNAMES.ORA anywhere. I searched for oracle and I found the following path contains the oracle libraries. [root@bagvapp rupert]# ll /usr/lib/oracle/11.2/client/lib/ total 143280 -rw-r--r-- 1 root root 7456 Aug 14 2009 cobsqlintf.o -rw-r--r-- 1 root root 342 Aug 14 2009 glogin.sql lrwxrwxrwx 1 root root 17 Mar 9 06:52 libclntsh.so -> libclntsh.so.11.1 -rw-r--r-- 1 root root 40088477 Aug 14 2009 libclntsh.so.11.1 -rw-r--r-- 1 root root 6986848 Aug 14 2009 libnnz11.so lrwxrwxrwx 1 root root 15 Mar 9 06:52 libocci.so -> libocci.so.11.1 -rw-r--r-- 1 root root 1879549 Aug 14 2009 libocci.so.11.1 -rw-r--r-- 1 root root 89377610 Aug 14 2009 libociei.so -rw-r--r-- 1 root root 152304 Aug 14 2009 libocijdbc11.so -rw-r--r-- 1 root root 1501651 Aug 14 2009 libsqlplusic.so -rw-r--r-- 1 root root 1218075 Aug 14 2009 libsqlplus.so -rw-r--r-- 1 root root 777979 Aug 14 2009 libsqora.so.11.1 -rw-r--r-- 1 root root 1996228 Aug 14 2009 ojdbc5.jar -rw-r--r-- 1 root root 2111220 Aug 14 2009 ojdbc6.jar -rw-r--r-- 1 root root 298388 Aug 14 2009 ottclasses.zip drwxr-xr-x 3 root root 4096 Mar 9 06:52 precomp -rw-r--r-- 1 root root 37807 Aug 14 2009 xstreams.jar no TNSPING available, no TNSNAMES.ORA, Now how to configure the mono to use this as the oracle client? and how to specify oracle database in app.config connection string section? Though mono is a powerful framework, seems like it is having problems like linux does, all the documentation is only available in mailing lists and whatever is available on official site is either outdated or not clear for normal user. Hope things will change soon and Mono will THE programming framework for linux.

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• Problems referencing build output from TFS Build and Visual Studio

  - by pmdarrow

  Here's what I'm trying to do: I have two solutions - one for my main application and its associated projects and another for my database (VS .dbproj) and its associated projects. What I'd like to do is include the output from the database project (a .dbschema and some SQL scripts) in my WiX installer (which exists in the main application solution.) This involves having TFS build the DB solution immediately before the main application solution. I've got that part working properly, but I'm having trouble referencing the output of the DB solution from my installer. I'm using relative paths to reference the DB project output in my WiX installer (e.g. <?define DBProjectOutputDir = "..\..\MyDatabaseSolution\MyDatabaseProject\sql\"?>) which works fine locally, but fails when building via TFS build. This is because TFS Build apparently changes the output dir of each project to one common location. Instead of the path to my database project being ..\..\MyDatabaseSolution\MyDatabaseProject\sql\ like it is when building locally, it gets set to something like ..\..\..\Binaries\Release\. How can I get around this and have a consistent output location to reference from my installer project? I'm using TFS 2005 and VS 2008.

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• Properly using Log4r in Ruby Application

  - by Spencer

  I must really be missing something obvious, but I'm having trouble with general use of Log4r in my Ruby application. I am able to log without issue, but the overhead seems clunky the way I have it setup. I'm basically passing the full path to a filename to log in each class in my application. The ruby script that is called pulls the log file from one of the arguments in ARGV which is then passed around and set in each class that I call in ruby. In each class I use the patternFormatter to insert the class/file name into the log statement. Is there a better way to make this work? It feels like no matter what I think of will require something to be passed to each class in my ruby application. I could set the log file in a yaml configuration file instead, but then I would be passing around the configuration file to each class as well. Any advice? If this doesn't make sense I could try and post some more specific code samples to further explain what I mean. Thanks!

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• Writing a code example

  - by Stefano Borini

  I would like to have your feedback regarding code examples. One of the most frustrating experiences I sometimes have when learning a new technology is finding useless examples. I think an example as the most precious thing that comes with a new library, language, or technology. It must be a starting point, a wise and unadulterated explanation on how to achieve a given result. A perfect example must have the following characteristics: Self contained: it should be small enough to be compiled or executed as a single program, without dependencies or complex makefiles. An example is also a strong functional test if you correctly installed the new technology. The more issues could arise, the more likely is that something goes wrong, and the more difficult is to debug and solve the situation. Pertinent: it should demonstrate one, and only one, specific feature of your software/library, involving the minimal additional behavior from external libraries. Helpful: the code should bring you forward, step by step, using comments or self-documenting code. Extensible: the example code should be a small “framework” or blueprint for additional tinkering. A learner can start by adding features to this blueprint. Recyclable: it should be possible to extract parts of the example to use in your own code Easy: An example code is not the place to show your code-fu skillz. Keep it easy. helpful acronym: SPHERE. Prototypical examples of violations of those rules are the following: Violation of self-containedness: an example spanning multiple files without any real need for it. If your example is a python program, keep everything into a single module file. Don’t sub-modularize it. In Java, try to keep everything into a single class, unless you really must partition some entity into a meaningful object you need to pass around (and java mandates one class per file, if I remember correctly). Violation of Pertinency: When showing how many different shapes you can draw, adding radio buttons and complex controls with all the possible choices for point shapes is a bad idea. You de-focalize your example code, introducing code for event handling, controls initialization etc., and this is not part the feature you want to demonstrate, they are unnecessary noise in the understanding of the crucial mechanisms providing the feature. Violation of Helpfulness: code containing dubious naming, wrong comments, hacks, and functions longer than one page of code. Violation of Extensibility: badly factored code that have everything into a single function, with potentially swappable entities embedded within the code. Example: if an example reads data from a file and displays it, create a method getData() returning a useful entity, instead of opening the file raw and plotting the stuff. This way, if the user of the library needs to read data from a HTTP server instead, he just has to modify the getData() module and use the example almost as-is. Another violation of Extensibility comes if the example code is not under a fully liberal (e.g. MIT or BSD) license. Violation of Recyclability: when the code layout is so intermingled that is difficult to easily copy and paste parts of it and recycle them into another program. Again, licensing is also a factor. Violation of Easiness: Yes, you are a functional-programming nerd and want to show how cool you are by doing everything on a single line of map, filter and so on, but that could not be helpful to someone else, who is already under pressure to understand your library, and now has to understand your code as well. And in general, the final rule: if it takes more than 10 minutes to do the following: compile the code, run it, read the source, and understand it fully, it means that the example is not a good one. Please let me know your opinion, either positive or negative, or experience on this regard.

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• Can't create new xib files in Xcode projects

  - by Reed Olsen

  This one is a doozy... My buddy just downloaded the iPhone SDK on his Snow Leopard MacBook Pro. No matter what kind of project he creates (Window Based, View Based, etc...,) he can't create or use his own xib files. The project will compile and run fine until he adds a new xib file. Here are some symptoms: When he selects a pre-generated xib in Xcode (such as MainWindow.xib), no preview is shown on the right hand side. Double clicking on this file will open it in interface builder (This is correct behavior). When he selects his own custom xib, the preview pane displays the XML content of the xib. Double clicking on his custom xib opens up the XML file in Xcode - as if it were a standard code file (This is jacked up). Opening his custom xib from finder opens it in Interface Builder. When building the application, the build warning says something to the effect of "Warning: No rule to process file /path/to/CustomXib of type sourcecode.xib for architecture i386" At runtime he gets the error: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController _loadViewFromNibNamed:bundle:] was unable to load a nib named "MyCustomXib"' We've uninstalled Xcode from the command line and reinstalled. I've verified that it's the right version for his machine. I'm stumped!

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• Flash as3 smooth threshold

  - by arkzai

  hello, I'm building a flash app that pulls images from flickr and removes the white background I'm dong this using threshold and i get a really ragged outcome is there any way to get a better and smoother color key? thanks photoNumber = Math.floor(Math.random() * (photos.length)); loader.load(new URLRequest(photos[photoNumber].path)); loader.contentLoaderInfo.addEventListener(Event.COMPLETE,draw); trace ( "trying to load photo " + photoNumber ); function draw(e:Event) { trace ("show photo " + photoNumber) var W:int=e.target.content.width; var H:int=e.target.content.height; bitmapdata=new BitmapData(W,H); bitmap=new Bitmap(bitmapdata); bitmapdata.draw(e.target.content); var threshold:uint = 0xF9F8F800; var color:uint = 0x00000000; var maskColor:uint = 0x00FF0000; bitmapdata.threshold(bitmapdata,new Rectangle(0,0,W,H),new Point(0,0),">", threshold, color, maskColor, true); bitmap.smoothing = true; //bitmap.scaleX = bitmap.scaleY = 0.99; // <---- imgHolder.addChild(bitmap); } }

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• How can I open VLC via browser with PHP (Mac OS X)

  - by Damiqib

  I'm trying to open VLC via browser and make it instantly play the given video file on Mac OS X. This runs on my local server and is only meant to run locally - therefore I already run apache (MAMP) with my username and with group "staff" (defined in httpd.conf). YES - I do know that VLC has http interface - however that is not what I need, so do not suggest that... My current system works without any problems when I run it via Terminal: php /var/www/Movies/index.php - This leads to VLC opening and video starts playing fullscreen like intented. Problems start when I run the same PHP-page with browser. Then the VLC-process starts, but there's no GUI for it, video file won't start playing and the VLC-process takes nearly 100% of CPU. Both; terminal and browser started VLC-processes run with the same user (mine) Both have "Parent process" bash VLC-process begun with Terminal has empty "Process group" (only process id-number) and browser started has "httpd" + (id-number) VLC-process started via browser makes 1000-times more "Mach System Calls" than it's Terminal-started counterpart. Could anyone give me any pointers on how to get this thing working? index.php # $j is a file path to the videofile and is defined before exec('/var/www/Movies/vlc.sh "' . $j . '" > /dev/null 2>&1 & echo $!;'); # If I do this in the given PHP-page it tells me that apache is running # with my username and with the group "staff" like it should be... exec('whoamI'); vlc.sh #!/bin/bash # Activate VLC in 5 seconds to make it the front-most window (sleep 5; open -a VLC) & # Open video file /Applications/VLC.app/Contents/MacOS/VLC --quiet --fullscreen "$1"

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• Unit Testing Error - The unit test adapter failed to connect to the data source or to read the data

  - by michael.lukatchik

  I'm using VSTS 2K8 and I've set up a Unit Test Project. In it, I have a test class with a method that does a simple assertion. I'm using an Excel 2007 spreadsheet as my data source. My test method looks like this: [DataSource("System.Data.Odbc", "Dsn=Excel Files;dbq=|DataDirectory|\\MyTestData.xlsx;defaultdir=C:\\TestData;driverid=1046;maxbuffersize=2048;pagetimeout=5", "Sheet1", DataAccessMethod.Sequential)] [DeploymentItem("MyTestData.xlsx")] [TestMethod()] public void State_Value_Is_Set() { string expected = "MD"; string actual = TestContext.DataRow["State"] as string; Assert.AreEqual(expected, actual); } As indicated in the method decoration attributes, my Excel spreadsheet is on my local C:/ Drive. In it, the sheet where all of my data is located is named "Sheet1". I've copied the Excel spreadsheet into my project and I've set its Build Action = "Content" and I've set its Copy to Output Directory = "Copy if Newer". When trying to run this simple unit test, I receive the following error: The unit test adapter failed to connect to the data source or to read the data. For more information on troubleshooting this error, see "Troubleshooting Data-Driven Unit Tests" (http://go.microsoft.com/fwlink/?LinkId=62412) in the MSDN Library. Error details: ERROR [42S02] [Microsoft][ODBC Excel Driver] The Microsoft Office Access database engine could not find the object 'Sheet1'. Make sure the object exists and that you spell its name and the path name correctly. I've verified that the sheet name is spelled correctly (i.e. Sheet1) and I've verified that my data sources are set correctly. Web searches haven't turned up much at all. And I'm totally stumped. All help or input is appreciated!!!!

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• Representing game states in Tic Tac Toe

  - by dacman

  The goal of the assignment that I'm currently working on for my Data Structures class is to create a of Quantum Tic Tac Toe with an AI that plays to win. Currently, I'm having a bit of trouble finding the most efficient way to represent states. Overview of current Structure: AbstractGame Has and manages AbstractPlayers (game.nextPlayer() returns next player by int ID) Has and intializes AbstractBoard at the beginning of the game Has a GameTree (Complete if called in initialization, incomplete otherwise) AbstractBoard Has a State, a Dimension, and a Parent Game Is a mediator between Player and State, (Translates States from collections of rows to a Point representation Is a StateConsumer AbstractPlayer Is a State Producer Has a ConcreteEvaluationStrategy to evaluate the current board StateTransveralPool Precomputes possible transversals of "3-states". Stores them in a HashMap, where the Set contains nextStates for a given "3-state" State Contains 3 Sets -- a Set of X-Moves, O-Moves, and the Board Each Integer in the set is a Row. These Integer values can be used to get the next row-state from the StateTransversalPool SO, the principle is Each row can be represented by the binary numbers 000-111, where 0 implies an open space and 1 implies a closed space. So, for an incomplete TTT board: From the Set<Integer> board perspective: X_X R1 might be: 101 OO_ R2 might be: 110 X_X R3 might be: 101, where 1 is an open space, and 0 is a closed space From the Set<Integer> xMoves perspective: X_X R1 might be: 101 OO_ R2 might be: 000 X_X R3 might be: 101, where 1 is an X and 0 is not From the Set<Integer> oMoves perspective: X_X R1 might be: 000 OO_ R2 might be: 110 X_X R3 might be: 000, where 1 is an O and 0 is not Then we see that x{R1,R2,R3} & o{R1,R2,R3} = board{R1,R2,R3} The problem is quickly generating next states for the GameTree. If I have player Max (x) with board{R1,R2,R3}, then getting the next row-states for R1, R2, and R3 is simple.. Set<Integer> R1nextStates = StateTransversalPool.get(R1); The problem is that I have to combine each one of those states with R1 and R2. Is there a better data structure besides Set that I could use? Is there a more efficient approach in general? I've also found Point<-State mediation cumbersome. Is there another approach that I could try there? Thanks! Here is the code for my ConcretePlayer class. It might help explain how players produce new states via moves, using the StateProducer (which might need to become StateFactory or StateBuilder). public class ConcretePlayerGeneric extends AbstractPlayer { @Override public BinaryState makeMove() { // Given a move and the current state, produce a new state Point playerMove = super.strategy.evaluate(this); BinaryState currentState = super.getInGame().getBoard().getState(); return StateProducer.getState(this, playerMove, currentState); } } EDIT: I'm starting with normal TTT and moving to Quantum TTT. Given the framework, it should be as simple as creating several new Concrete classes and tweaking some things.

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• Multiple Application Support Directories for iPhone Simulator?

  - by Alex G

  I am developing an iPhone app with someone else. The app works fine for me, but he is running into a bug. We think this bug is related to the fact that he is getting multiple Application directories for this same app. In my ~/Library/Application Support/iPhone Simulator/User/Applications, I only have one folder at all times. He says that he will get 3 or 4 directories when he is only working on this one app. We think this is our problem because our bug has to do with displaying images that are stored in the app's Documents folder. Does anyone know why he is ending up with multiple directories or how to stop it? Edit: Here is the code for writing the image to a file: NSData *image = [NSData dataWithContentsOfURL:[NSURL URLWithString:[currentArticle articleImage]]]; NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *imagePath = [array objectAtIndex:0]; NSFileManager *NSFM = [NSFileManager defaultManager]; BOOL isDir = YES; if(![NSFM fileExistsAtPath:imagePath isDirectory:&isDir]) if(![NSFM createDirectoryAtPath:imagePath attributes:nil]) NSLog(@"error"); imagePath = [imagePath stringByAppendingFormat:@"/images"]; if(![NSFM fileExistsAtPath:imagePath isDirectory:&isDir]) if(![NSFM createDirectoryAtPath:imagePath attributes:nil]) NSLog(@"error"); imagePath = [imagePath stringByAppendingFormat:@"/%@.jpg", [currentArticle uniqueID]]; [image writeToFile:imagePath atomically:NO]; And here is the code for getting the path when I need the image: - (NSString *)imagePath { NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *imagePath = [array objectAtIndex:0]; return [imagePath stringByAppendingFormat:@"/images/%@.jpg", [self uniqueID]]; } The app works great for me, but my partner says that the images don't show up intermittently, and he notices that he gets multiple directories in his Applications folder.

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