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  • Iterator blocks in Clojure?

    - by Checkers
    I am using clojure.contrib.sql to fetch some records from an SQLite database. (defn read-all-foo [] (with-connection *db* (with-query-results res ["select * from foo"] (into [] res)))) Now, I don't really want to realize the whole sequence before returning from the function (i.e. I want to keep it lazy), but if I return res directly or wrap it some kind of lazy wrapper (for example I want to make a certain map transformation on result sequence), SQL-related bindings will be reset and connection will be closed after I return, so realizing the sequence will throw an exception. How can I enclose the whole function in a closure and return a kind of iterator block (like yield in C# or Python)? Or is there another way to return a lazy sequence from this function?

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  • CircuitLab Offers Easy Circuit Building on the Web and iPad

    - by Jason Fitzpatrick
    If you like to sketch out your circuit designs rapidly, cleanly, and on the web or your iPad, CircuitLab makes it dead simple. The free tool includes an easy drag-and-drop interface, circuit analysis, easy printing, and more. Watch the video above to see the creators of CircuitLab whipping up a simple circuit to showcase the app, then hit up the link below to try it out. CircuitLab [via Hacked Gadgets] How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It? HTG Explains: What Is Windows RT and What Does It Mean To Me?

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  • Can I connect to SQL Server using Windows Authentication from Java EE webapp?

    - by KG
    I am currently investigating how to make a connection to a SQL Server database from my Java EE web application using Windows Authentication instead of SQL Server authentication. I am running this app off of Tomcat 6.0, and am utilizing the Microsoft JDBC driver. My connection properties file looks as follows: dbDriver = com.microsoft.sqlserver.jdbc.SQLServerDriver dbUser = user dbPass = password dbServer = localhost:1433;databaseName=testDb dbUrl = jdbc:sqlserver://localhost:1433 I have zero problems with connecting to a SQL Server database in this fashion when using SQL Server authentication. Is there any way I can retrieve the credentials of the user's Windows Authentication and use that authentication for SQL Server? UPDATE: I know in ASP.net there is a way to set up Windows Authentication for access to the webapp, which is exactly what I am looking for, except I want to pass that token off to SQL Server for access to the database.

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  • Getting "Object is read only" error when setting ClientCredentials in WCF

    - by Paul Mrozowski
    I have a proxy object generated by Visual Studio (client side) named ServerClient. I am attempting to set ClientCredentials.UserName.UserName/Password before opening up a new connection using this code: InstanceContext context = new InstanceContext(this); m_client = new ServerClient(context); m_client.ClientCredentials.UserName.UserName = "Sample"; As soon as the code hits the UserName line it fails with an "Object is read-only" error. I know this can happen if the connection is already open or faulted, but at this point I haven't called context.Open() yet. I have configured the Bindings (which uses netTcpBinding) to use Message as it's security mode, and MessageClientCredentialType is set to UserName. Any ideas?

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  • Friday Fun: Maus Trap

    - by Asian Angel
    Friday is here once again, but today you are not the only one who needs to escape! This week your mission is to help a poor mouse named Peanut escape the dangerous lab she is trapped in. Do you have what it takes to save the day Latest Features How-To Geek ETC How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware The Splendiferous Array of Culinary Tools [Infographic] Add a Real-Time Earth Wallpaper App to Ubuntu with xplanetFX The Citroen GT – An Awesome Video Game Car Brought to Life [Video] Final Man vs. Machine Round of Jeopardy Unfolds; Watson Dominates Give Chromium-Based Browser Desktop Notifications a Native System Look in Ubuntu Chrome Time Track Is a Simple Task Time Tracker

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  • HTG Explains: How Do Noise Reducing Headphones Work?

    - by YatriTrivedi
    Passive noise reduction, active noise cancellation, sound isolation… The world of headphones has become quite advanced in giving you your own private sound bubble. Here’s how these different technologies work. Latest Features How-To Geek ETC Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) WizMouse Enables Mouse Over Scrolling on Any Window Enhance GIMP’s Image Editing Power with Gimp Paint Studio Reclaim Vertical UI Space by Moving Your Tabs to the Side in Firefox Wind and Water: Puzzle Battles – An Awesome Game for Linux and Windows How Star Wars Changed the World [Infographic] Tabs Visual Manager Adds Thumbnailed Tab Switching to Chrome

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  • Centralized Credentials Service For Various Apps

    - by Vlad
    We are researching the possibility to build a centralized credentials storage for internal applications. These apps (vb6, vb.net, web apps in asp.net, etc) are using various instances of SQL servers and iSeries. We want to implement a central credentials facility that would act as a security broker. Basically it should work like this: Client app supplies AppID (I am Sales Application) and EnvironmentID (I am running in QA environment) and in return will get either a connection object (preferred) or encrypted connection string that will allow said application to connect to resources it needs. There will be cases when application needs to connect to two (or more) database resources (i.e. to SQL and iSeries). What are looking at DP API at the moment, but I am not convinced that DP API is the solution as it tied in with machine key. In our case using machine key isn't feasible, so I want to know if there are other approaches available.

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  • Server crash = How does a TCP/IP (and the browser-client) behave after this?

    - by jens
    Hello Experts, i would be thankfull for an explanation what happens with HTTP(TCP/IP) transmissions when the server crashes unexpectedly, how does the client Browser (Firefox / IE) handle this event. What happens in the following two standard cases: Clients-actively sends data: The TCP/IP Connection has been estableshed and the Client (Web-Browser) is Sending a POST Request with some data and in the middle of the process of sending the server crashes. What does this mean for the client? As far as I know TCP/IP does not "acknowledge" a send data-package so the client does not know that the server crashed. How will the client behave? (Firefox and Internet Explorer)? The Server is actively sending data: As above the tcp/ip connection has been established and the Server is sending a large website to the client (browser). In the middle of the sending-process the server crashes, so no futher packets are sent. How does the client browser react to this event (Firefox and Interne Expolrer) Thank you very much!! Jens

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  • CommunicationException in WCF

    - by user343159
    Hi I have a problem with a WCF Service I've just created. This was working yesterday but for some reason it's just stopped working. One of my WCF methods returns an array of an Entity Framework entity, like this: public BranchContactDetail[] GetClosestBranches(string postcode, int howManyBranches) { GeoLocation geoLocation = GetLocationFromPostcode(postcode); Location location = new Location(geoLocation.Latitude, geoLocation.Longitude); using (BranchDirectoryEntities entities = new BranchDirectoryEntities()) { var branchesInOrder = entities.BranchContactDetails .Where(b => b.latitude.HasValue && b.longitude.HasValue ) .OrderBy(b => location.DistanceFrom(b.latitude, b.longitude)) .Take(howManyBranches) .ToArray(); return branchesInOrder; } } ...and, as I say, this was working fine yesterday. Now I'm getting a "The underlying connection was closed: The connection was closed unexpectedly." I've hunted all over the web but no-one seems to know the answer. Anyone shed any light on this issue? Regards, Mark

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  • Rails / ActiveRecord Modeling Help

    - by JM
    I’m trying to model a relationship in ActiveRecord and I think it’s a little beyond my skill level. Here’s the background. This is a horse racing project and I’m trying to model a horses Connections over time. Connections are defined as the Horse’s Current: Owner, Trainer and Jockey. Over time, a horse’s connections can change for a lot of different reasons: The owner sells the horse in a private sale The horse is claimed (purchase in a public sale) The Trainer switches jockeys The owner switches trainers In my first attempt at modeling this, I created the following tables: Horses, Owners, Trainers, Jockeys and Connections. Essentially, the Connections table was the has-many-through join table and was structured as follows: Connections Table 1 Id Horse_id Owner_id Trainer_id Jockey_id Status_Code Status_Date Change_Code The Horse, Owner, Trainer and Jockey foreign keys are self explanatory. The status code is 1 or 0 (1 active, 0 inactive) and the status date is the date the status changed. Change_code is and integer or string value that represent the reason for the change (private sale, claim, jockey change, etc) The key benefit of this approach is that the Connection is represented as one record in the connections table. The downside is that I have to have a table for Owner (1), Trainer (2) and Jockey (3) when one table could due. In my second attempt at modeling this I created the following tables: Horses, Connections, Entities The Entities tables has the following structure Entities Table id First_name Last_name Role where Role represents if the entity is a Owner, Trainer or Jockey. Under this approach, my Connections table has the following structure Connections Table 2 id Horse_id Entity_id Role Status_Code Status_Date Change_Code 1 1 1 1 1 1/1/2010 2 1 4 2 1 1/1/2010 3 1 10 3 1 1/1/2010 This approach has the benefit of eliminating two tables, but on the other hand the Connection is now comprised of three different records as opposed to one in the first approach. What believe I’m looking for is an approach that allows me to capture the Connection in one record, but also uses an Entities table with roles instead of the Owner, Trainer and Jockey tables. I’m new to ActiveRecord and rails so any and all input would be greatly appreciated. Perhaps there are other ways that would even be better. Thanks!

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  • Matlab: Adding symbols to figure

    - by niko
    Hi, Below is the user interface I have created to simulate LDPC coding and decoding The code sequence is decoded iteratively by passing values between the left and right nodes through the connections. The first thing it would be good to add in order to improve visualization is to add arrows to the connections in the direction of passing values. The alternative is to draw a bigger arrow at the top of the connection showing the direction. Another thing I would like to do is displaying the current mathematical operation below the connection (in this example c * H'). What I don't know how to do is displaying special characters and mathematical symbols and other kinds of text such as subscript and superscript in the figure (for example sum sign and subscript "T" instead of sign ="'" to indicate transposed matrix). I would be very thankful if anyone could point to any useful resources for the questions above or show the solution. Thank you.

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  • Can Java ServerSocket and Sockets using ObjectIOStreams lose packets?

    - by Joel Garboden
    I'm using a ServerSocket on my server and Sockets that use ObjectIOStreams to send serializable objects over the network connection. I'm developing an essentially more financial version of monopoly and thus packets being sent and confirmed as sent/received is required. Do I need to implement my own packet loss watcher or is that already taken care of with (Server)Sockets? I'm primarily asking about losing packets during network blips or whatnot, not full connection error. E.g. siblings move a lead plate between my router and computer's wi-fi adapter. http://code.google.com/p/inequity/source/browse/#svn/trunk/src/network Code can be found under network-ClientController and network-Server

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  • Rails Unit Testing with MyISAM Tables

    - by tadman
    I've got an application that requires the use of MyISAM on a few tables, but the rest are the traditional InnoDB type. The application itself is not concerned with transactions where it applies to these records, but performance is a concern. The Rails testing environment assumes the engine used is transactional, though, so when the test database is generated from the schema.rb it is imported with the same engine. Is it possible to over-ride this behaviour in a simple manner? I've resorted to an awful hack to ensure the tables are the correct type by appending this to test_helper.rb: (ActiveRecord::Base.connection.select_values("SHOW TABLES") - %w[ schema_info ]).each do |table_name| ActiveRecord::Base.connection.execute("ALTER TABLE `#{table_name}` ENGINE=InnoDB") end Is there a better way to make a MyISAM-backed model be testable?

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  • Build a LEGO Creation without Leaving Your Cube

    - by Jason Fitzpatrick
    Just because you’re stuck at your desk doesn’t mean you can’t sneak in a little fun. At BuildWithChrome you can slap together virtual LEGO bricks with ease. The site, a collaboration between Google and LEGO, shows you a massive map of Australia and New Zealand covered in thousands of LEGO base plates. Zoom in, select a base plate, and get building. The block selection is fairly limited (you can work with the kind of blocks you’d find in a generic LEGO brick pack) but it’s still quite a bit of fun. When I took it for a test drive, I started simple by building a house-like structure: With the addition of a few more pieces it would be possible to pull off the wizard shop my wife and daughter just built: How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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  • can not connect the apples APN server for pusNotification from by PHP code

    - by faisal
    Hi developers, To connect my server with the APN server I use the following code. // coonecting the apn server $apnsHost = 'gateway.sandbox.push.apple.com'; $apnsPort = 2195; $apnsCert = 'apns-dev.pem'; $streamContext = stream_context_create(); stream_context_set_option($streamContext, 'ssl', 'local_cert', $apnsCert); $apns = stream_socket_client('ssl://' . $apnsHost . ':' . $apnsPort, $errorNo, $errorString, 2, STREAM_CLIENT_CONNECT, $streamContext); But I am failed to connect, I print the $errorNo and $errorString the output was: error: Connection timed out errorNo: 110 But I am also getting the following warnings in errorLog: unable to connect to ssl://gateway.sandbox.push.apple.com:2195 (Connection timed out) in /home/riseupla/public_html/applications/apn/apn.php on line 35 what shoud I do? plz help. NOTE: I can send pushnotification by my mac project (using push me baby project). But my PHP project failed to connect.

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  • Feel the Chill of the South Atlantic with the Antarctica Theme for Windows 7

    - by Asian Angel
    Are you fascinated by the beauty and wildlife of Antarctica? Then bring both to your desktop with the Antarctica Theme for Windows 7. The theme comes with fifteen gorgeous wallpapers of frosty scenery, penguins, whales, and more to make your desktop icy cool. Download the Antarctica Theme [Windows 7 Personalization Gallery] Latest Features How-To Geek ETC What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Make Efficient Use of Tab Bar Space by Customizing Tab Width in Firefox See the Geeky Work Done Behind the Scenes to Add Sounds to Movies [Video] Use a Crayon to Enhance Engraved Lettering on Electronics Adult Swim Brings Their Programming Lineup to iOS Devices Feel the Chill of the South Atlantic with the Antarctica Theme for Windows 7 Seas0nPass Now Offers Untethered Apple TV Jailbreaking

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  • Examples of networked Flash games

    - by videodnd
    Maybe I am asking the wrong questions, because I don't see any sample projects out there. I know Flash developers have done Kiosks and renovated arcade games. "Come on, we see Flash everywhere." Is there a sample project I could be pointed towards, it would be an ass-saver. Can I prepare my swf files like an image gallery and receive XML commands to load it? Where do I start? Flash/After Effects skills have got me through so far, but I need help!!! It would be fun if it wasn't so stressful. Criteria TCP/IP socket connection Flash package XML commands load swf file in to a container Additional Questions How do I prepare my Flash files and XML sheet to receive commands "any sample out there"? What about e.data, urlLoad, xmlSocket Class, XMLCP/IP XML socket connection to load Is binary or XML method better for loading and reloading swf files? Do I need Red5 or a media server? videoDnd, Ambitious Development Noob

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  • Webserver parsing chrome input from post request

    - by ravenspoint
    I am developing a small embedded web server. I want to add parsing of post requests, but I am having a problem with input password fields from Chrome. Firefox and IE work perfectly. The HTML: <form action=start.webem method=post> <input value="START" type=submit /><!--#webem start --> <p>Password: <input TYPE=PASSWORD name=yourname AUTOCOMPLETE=OFF /><br> </form> From Firefox I get POST /stop.webem HTTP/1.1 Host: 127.0.0.1:8080 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.9) Gecko/20100315 Firefox/3.5.9 (.NET CLR 3.5.30729) Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Referer: http://127.0.0.1:8080/ Content-Type: application/x-www-form-urlencoded Content-Length: 13 yourname=test However from Chrome, about 90% of the time, the yourname=test is missing POST /start.webem HTTP/1.1 Host: 127.0.0.1:8080 Connection: keep-alive User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249.1045 Safari/532.5 Referer: http://127.0.0.1:8080/ Content-Length: 13 Cache-Control: max-age=0 Origin: http://127.0.0.1:8080 Content-Type: application/x-www-form-urlencoded Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 Though, occasionally it does work!!! POST /start.webem HTTP/1.1 Host: 127.0.0.1:8080 Connection: keep-alive User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.1.249.1045 Safari/532.5 Referer: http://127.0.0.1:8080/start.webem Content-Length: 13 Cache-Control: max-age=0 Origin: http://127.0.0.1:8080 Content-Type: application/x-www-form-urlencoded Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 yourname=test I cannot find what causes it to work sometimes.

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  • Ubuntu 12.04 LTS Realtek RTL8192E Problems

    - by Logan
    My wifi is not working. I have tried ndiswrapper with the XP driver but that still did not work. Please explain to me in layman's terms. I can run commands so if you tell me exactly what to put, i will put it. Basically, ubuntu is not showing a wireless networks option and when I ran some command yesterday it said the driver was UNCLAIMED. Please help. This is a wintec card with realtek rtl8192E chip on it. It is a desktop computer. On a 20gb partition, other 60gb is for windows(yeah its an old desktop). Use windows installer to install ubuntu(this is one of the dell desktops that wont boot ubuntu from disk). So any help is appreciated and I would like to get this done THIS weekend.

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  • No network packets sent immediately after quick physical disconnect and reconnect.

    - by Hans
    I am using Boost's ASIO libraries to establish a UDP connection to a remote server. To make sure the connection is active, every second a keep-alive message is sent to the server. I have noticed that if I unplug the network cable and reinsert it quickly, the first 2 or 3 keep-alive messages after the reinsert are never sent. I tested this by running wire-shark on the server. I have seen it take up to 5 seconds before the client starts sending out network traffic again. The client is running under Linux (2.6.2), if that helps.

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  • What data counters / meters are available?

    - by Santosh
    Actually I have a wireless 3G modem that works well on Windows based operating system, its interface software were made Windows centric. It can still connect to internet on Ubuntu or other linux based operating system but it won't show the data counter (the interface which shows how much data has been transferred, at what speed). If I continue to surf internet in Linux then I won't have any idea how much data has been used and it would become heavy on my pocket. So I just want a software that let me know how much data has been transferred, if there is a limiter; that warns or disconnects me when I reach predefined MBs then its better. Please let me know if there is any software or script or something like that already there.

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  • Unable to enumerate USB device

    - by takeshin
    Hello, My syslog is constantly filled with messages like this: Oct 16 11:48:35 my-laptop kernel: [61470.980078] hub 1-0:1.0: unable to enumerate USB device on port 2 Oct 16 11:48:35 my-laptop kernel: [61471.192079] hub 3-0:1.0: unable to enumerate USB device on port 2 The only USB device I use is Microsoft Natural Wireless Laser Mouse 7000. The laptop model is HP dv9500, Ubuntu 10.10, but the same was in the versions before. How can I fix this? Edit: Here's the output of sudo lsusb: Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 003: ID 045e:071d Microsoft Corp. Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub All USB devices seems to be working fine. I have some problems with DVD-R and sound card, but they are not USB.

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  • Ask the Readers: How Do You Keep Your Email SPAM Free and Tidy?

    - by Jason Fitzpatrick
    Email can be a fantastically efficient way to deal with communication, but not if it’s bogged down with SPAM messages and poorly organized. This week we want to hear all about the tips, tricks, and ninja-filters you use to keep your inbox tidy. Whether it’s special filters for your Bacon (spam-like marketing that you actually want to receive and occasional review), services you use to block spammers, or organization tips you use to keep your email inbox streamlined with no message unreplied to, we want to hear all about it. Sound off in the comments with your proclamations of your inbox-fu and how you maintain zen-like mastery over your email workflow. Be sure to check in on Friday for the What You Said roundup. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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  • Capturing a NSParseErrorException

    - by Martin
    Could someone tell me how I can capture a NSParseErrorException? The Situation: my app downloads a small .plist file. I convert this into dictionary using the string method -propertylist. This normally works fine. I check for a connection before going to retrieve the file, so it works fine if I've got a connection to the internet, and works fine when I don't. However, I discovered a use case that crashes. If I'm at location that requires authetication before connecting to the internet (at Starbucks, say) what's being returned by the app isn't a plist and the attempt to parse it causes the application to crash. So is there a way to transform my code so that the NSParseErrorException is caught and rather than crashing the program I can just skip over this piece of code? NSDictionary *temp = [myDownloadString propertyList]; I tried doing this if ([myDownloadString propertyList]==NSParseErrorException){ //do something } but that didn't work.

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  • How to Banish Duplicate Photos with VisiPic

    - by Jason Fitzpatrick
    You meant well, you intended to be a good file custodian, but somewhere along the way things got out of hand and you’ve got duplicate photos galore. Don’t be afraid to delete them and lose important photos, read on as we show you how to clean safely. Deleting duplicate files, especially important ones like personal photos, makes a lot of people quite anxious (and rightfully so). Nobody wants to be the one to realize that they deleted all the photos of their child’s first birthday party during a hard drive purge gone wrong. In this tutorial we’re going to show you how to go beyond the limited reach of  tools which simply compare file names and file sizes. Instead we’ll be using a program that combines that kind of comparison with actual image analysis to help you weed out not just perfect 1:1 file duplicates but also those piles of resized for email images, cropped images, and other modified images that might be cluttering up your hard drive. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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