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  • Why use try … finally without a catch clause?

    - by Nick Rosencrantz
    The classical way to program is with try / catch but when is it appropriate to use try without catch? In Python the following appears legal and can make sense: try: #do work finally: #do something unconditional But we didn't catch anything. Similarly one could think in Java it would be try { //for example try to get a database connection } finally { //closeConnection(connection) } It looks good and suddenly I don't have to worry about exception types etc. But if this is good practice, when is it good practice? Or reasons why this is not good practice or not legal (I didn't compile the source I'm asking about and it could be a syntax error for Java but I checked that the Python surely compiles.) A related problem I've run into is that I continue writing the function / method and at the end I must return something and I'm in a place which should not be reached and it must be a return point so even if I handle the exceptions above I'm still returning null or an empty string at some point in the code which should not be reached, often the end of the method / function. I've always managed to restructure to code so that I don't have to return null since that absolutely appears to look like less than good practice.

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  • Install NPM Packages Automatically for Node.js on Windows Azure Web Site

    - by Shaun
    In one of my previous post I described and demonstrated how to use NPM packages in Node.js and Windows Azure Web Site (WAWS). In that post I used NPM command to install packages, and then use Git for Windows to commit my changes and sync them to WAWS git repository. Then WAWS will trigger a new deployment to host my Node.js application. Someone may notice that, a NPM package may contains many files and could be a little bit huge. For example, the “azure” package, which is the Windows Azure SDK for Node.js, is about 6MB. Another popular package “express”, which is a rich MVC framework for Node.js, is about 1MB. When I firstly push my codes to Windows Azure, all of them must be uploaded to the cloud. Is that possible to let Windows Azure download and install these packages for us? In this post, I will introduce how to make WAWS install all required packages for us when deploying.   Let’s Start with Demo Demo is most straightforward. Let’s create a new WAWS and clone it to my local disk. Drag the folder into Git for Windows so that it can help us commit and push. Please refer to this post if you are not familiar with how to use Windows Azure Web Site, Git deployment, git clone and Git for Windows. And then open a command windows and install a package in our code folder. Let’s say I want to install “express”. And then created a new Node.js file named “server.js” and pasted the code as below. 1: var express = require("express"); 2: var app = express(); 3: 4: app.get("/", function(req, res) { 5: res.send("Hello Node.js and Express."); 6: }); 7: 8: console.log("Web application opened."); 9: app.listen(process.env.PORT); If we switch to Git for Windows right now we will find that it detected the changes we made, which includes the “server.js” and all files under “node_modules” folder. What we need to upload should only be our source code, but the huge package files also have to be uploaded as well. Now I will show you how to exclude them and let Windows Azure install the package on the cloud. First we need to add a special file named “.gitignore”. It seems cannot be done directly from the file explorer since this file only contains extension name. So we need to do it from command line. Navigate to the local repository folder and execute the command below to create an empty file named “.gitignore”. If the command windows asked for input just press Enter. 1: echo > .gitignore Now open this file and copy the content below and save. 1: node_modules Now if we switch to Git for Windows we will found that the packages under the “node_modules” were not in the change list. So now if we commit and push, the “express” packages will not be uploaded to Windows Azure. Second, let’s tell Windows Azure which packages it needs to install when deploying. Create another file named “package.json” and copy the content below into that file and save. 1: { 2: "name": "npmdemo", 3: "version": "1.0.0", 4: "dependencies": { 5: "express": "*" 6: } 7: } Now back to Git for Windows, commit our changes and push it to WAWS. Then let’s open the WAWS in developer portal, we will see that there’s a new deployment finished. Click the arrow right side of this deployment we can see how WAWS handle this deployment. Especially we can find WAWS executed NPM. And if we opened the log we can review what command WAWS executed to install the packages and the installation output messages. As you can see WAWS installed “express” for me from the cloud side, so that I don’t need to upload the whole bunch of the package to Azure. Open this website and we can see the result, which proved the “express” had been installed successfully.   What’s Happened Under the Hood Now let’s explain a bit on what the “.gitignore” and “package.json” mean. The “.gitignore” is an ignore configuration file for git repository. All files and folders listed in the “.gitignore” will be skipped from git push. In the example below I copied “node_modules” into this file in my local repository. This means,  do not track and upload all files under the “node_modules” folder. So by using “.gitignore” I skipped all packages from uploading to Windows Azure. “.gitignore” can contain files, folders. It can also contain the files and folders that we do NOT want to ignore. In the next section we will see how to use the un-ignore syntax to make the SQL package included. The “package.json” file is the package definition file for Node.js application. We can define the application name, version, description, author, etc. information in it in JSON format. And we can also put the dependent packages as well, to indicate which packages this Node.js application is needed. In WAWS, name and version is necessary. And when a deployment happened, WAWS will look into this file, find the dependent packages, execute the NPM command to install them one by one. So in the demo above I copied “express” into this file so that WAWS will install it for me automatically. I updated the dependencies section of the “package.json” file manually. But this can be done partially automatically. If we have a valid “package.json” in our local repository, then when we are going to install some packages we can specify “--save” parameter in “npm install” command, so that NPM will help us upgrade the dependencies part. For example, when I wanted to install “azure” package I should execute the command as below. Note that I added “--save” with the command. 1: npm install azure --save Once it finished my “package.json” will be updated automatically. Each dependent packages will be presented here. The JSON key is the package name while the value is the version range. Below is a brief list of the version range format. For more information about the “package.json” please refer here. Format Description Example version Must match the version exactly. "azure": "0.6.7" >=version Must be equal or great than the version. "azure": ">0.6.0" 1.2.x The version number must start with the supplied digits, but any digit may be used in place of the x. "azure": "0.6.x" ~version The version must be at least as high as the range, and it must be less than the next major revision above the range. "azure": "~0.6.7" * Matches any version. "azure": "*" And WAWS will install the proper version of the packages based on what you defined here. The process of WAWS git deployment and NPM installation would be like this.   But Some Packages… As we know, when we specified the dependencies in “package.json” WAWS will download and install them on the cloud. For most of packages it works very well. But there are some special packages may not work. This means, if the package installation needs some special environment restraints it might be failed. For example, the SQL Server Driver for Node.js package needs “node-gyp”, Python and C++ 2010 installed on the target machine during the NPM installation. If we just put the “msnodesql” in “package.json” file and push it to WAWS, the deployment will be failed since there’s no “node-gyp”, Python and C++ 2010 in the WAWS virtual machine. For example, the “server.js” file. 1: var express = require("express"); 2: var app = express(); 3: 4: app.get("/", function(req, res) { 5: res.send("Hello Node.js and Express."); 6: }); 7:  8: var sql = require("msnodesql"); 9: var connectionString = "Driver={SQL Server Native Client 10.0};Server=tcp:tqy4c0isfr.database.windows.net,1433;Database=msteched2012;Uid=shaunxu@tqy4c0isfr;Pwd=P@ssw0rd123;Encrypt=yes;Connection Timeout=30;"; 10: app.get("/sql", function (req, res) { 11: sql.open(connectionString, function (err, conn) { 12: if (err) { 13: console.log(err); 14: res.send(500, "Cannot open connection."); 15: } 16: else { 17: conn.queryRaw("SELECT * FROM [Resource]", function (err, results) { 18: if (err) { 19: console.log(err); 20: res.send(500, "Cannot retrieve records."); 21: } 22: else { 23: res.json(results); 24: } 25: }); 26: } 27: }); 28: }); 29: 30: console.log("Web application opened."); 31: app.listen(process.env.PORT); The “package.json” file. 1: { 2: "name": "npmdemo", 3: "version": "1.0.0", 4: "dependencies": { 5: "express": "*", 6: "msnodesql": "*" 7: } 8: } And it failed to deploy to WAWS. From the NPM log we can see it’s because “msnodesql” cannot be installed on WAWS. The solution is, in “.gitignore” file we should ignore all packages except the “msnodesql”, and upload the package by ourselves. This can be done by use the content as below. We firstly un-ignored the “node_modules” folder. And then we ignored all sub folders but need git to check each sub folders. And then we un-ignore one of the sub folders named “msnodesql” which is the SQL Server Node.js Driver. 1: !node_modules/ 2:  3: node_modules/* 4: !node_modules/msnodesql For more information about the syntax of “.gitignore” please refer to this thread. Now if we go to Git for Windows we will find the “msnodesql” was included in the uncommitted set while “express” was not. I also need remove the dependency of “msnodesql” from “package.json”. Commit and push to WAWS. Now we can see the deployment successfully done. And then we can use the Windows Azure SQL Database from our Node.js application through the “msnodesql” package we uploaded.   Summary In this post I demonstrated how to leverage the deployment process of Windows Azure Web Site to install NPM packages during the publish action. With the “.gitignore” and “package.json” file we can ignore the dependent packages from our Node.js and let Windows Azure Web Site download and install them while deployed. For some special packages that cannot be installed by Windows Azure Web Site, such as “msnodesql”, we can put them into the publish payload as well. With the combination of Windows Azure Web Site, Node.js and NPM it makes even more easy and quick for us to develop and deploy our Node.js application to the cloud.   Hope this helps, Shaun All documents and related graphics, codes are provided "AS IS" without warranty of any kind. Copyright © Shaun Ziyan Xu. This work is licensed under the Creative Commons License.

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  • New install of Steam not running on new install of Ubuntu 13.10

    - by inferKNOX
    I tried purging steam, un-installing and reinstalling steam, deleting /home/.steam/share/steam/appcache/, deleting everything in /home/.steam/share/steam/ and nothing helped. I installed Ubuntu, then steam into it directly afterward. I installed steam from Ubuntu Software Centre, launched it, it updated 206MB, then closed. When I tried to launch it again, it momentarily flashes the checking for update dialogue, then closes every time. Then (in an unrelated event) Ubuntu said some system updates are necessary and one of them was Steam launcher. I did the update, tried to launch Steam; same story. Really need help on this, as I did a complete re-isntall of Ubuntu, then Steam again and it did not help at all. Here's the log: user@computer:~$ steam Running Steam on ubuntu 13.10 64-bit STEAM_RUNTIME is enabled automatically Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) unlinked 0 orphaned pipes removing stale semaphore last operated on by process 2297 with name 0eBlobRegistryMutex_313E4D748EE12691A95DDE8913185F7E removing stale semaphore last operated on by process 2297 with name 0eBlobRegistrySignal_313E4D748EE12691A95DDE8913185F7E removing stale semaphore last operated on by process 2297 with name 0emSteamEngineInstance removing stale semaphore last operated on by process 2297 with name 0eSteamEngineLock Gtk-Message: Failed to load module "overlay-scrollbar" Gtk-Message: Failed to load module "unity-gtk-module" Installing breakpad exception handler for appid(steam)/version(1381282832_client) Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number [1030/115016:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Installing breakpad exception handler for appid(steam)/version(1381282832_client) Steam: An X Error occurred X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 18 (X_ChangeProperty) Value in failed request: 0x0 Serial number of failed request: 105 xerror_handler: X failed, continuing Uploading dump (out-of-process) [proxy ''] /tmp/dumps/crash_20131030115012_1.dmp /home/user/.local/share/Steam/steam.sh: line 717: 2650 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@" Finished uploading minidump (out-of-process): success = yes response: CrashID=bp-484ddae7-0b1c-4ae4-be84-42a9c2131030 Thanks in advance.

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  • Designing application flow

    - by Umesh Awasthi
    I am creating a web application in java where I need to mock the following flow. When user trigger a certain process (add product to cart), I need to pass through following steps Need to see in HTTP Session if user is logged in. Check HTTP Session if shopping cart is there If user exist in HTTP Session and his/her cart do not exist in HTTP Session Get user cart from the database. add item to cart and save it to HTTP session and update cart in DB. If cart does not exist in DB, create new cart and and save in it HTTP Session. Though I missed a lot of use cases here (do not want question length to increase a lot), but most of the flow will be same as I described in above steps. My flow will start from the Controller and will go towards Service Layer and than ends up in the DAO layer. Since there will be a lot of use cases where I need to check HTTP session and based on that need to call Service layer, I was planning to add a Facade layer which should be responsible to do this for me like checking Session and interacting with Service layer. Please suggest if this is a valid approach or any other best approach can be implemented here? One more point where I am confused is how to handle HTTP session in facade layer? do I need to pass HTTP session object each time I call my Facade or any other approach can be used here?

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  • iPhone/iPad: Get Alerts When Paid Apps Go Free

    - by Gopinath
    iPhone users has thousands of cool applications to choose. These apps are either paid or absolutely free. Many of the paid applications goes free for either a limited time or forever depending on the mood of their developers. Will it not be cool to get alerts whenever a paid app goes free? Yeah, it will be great. Free App Alert is a handy website that checks iTunes store regularly and sends alerts to it’s subscribers about the apps that have gone from paid to free. You can receive the alerts by following them on twitter, facebook or subscribing to the traditional RSS feeds(yeah RSS is a traditional technology). The home page of this website shows the apps that have gone free today and you can browse through the previous day free apps listing with the help of links available at the bottom. Free App Alert is definitely a cool site to check out for iPhone/iPod/iPad users and certainly easier than scrolling through iTunes store and checking prices. Tip: Immediately download the app that have gone from paid to free as many apps are free for limited time. You can see many free apps going back to paid version if you go through the previous pages the website. Join us on Facebook to read all our stories right inside your Facebook news feed.

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  • SDL & Windows 8 Metro WinRT

    - by Adrian
    I am just beginning to dip my tow into game programming and have been reading up on SDL, SFML, OpenGL, XNA, MonoGame and of course DirectX. (Needless to say there are a lot of choices out there) As much as I like SFMLs syntax I have chosen to read up and start with SDL as it is pretty ubiquitous and available on every platform (Windows, Linux, Mac) and also available on portable devices (Android, iOS) with the current exception of WinPhone 7 After that pre-amble here is my question. I notice that the docs say that for the windows platform the SDL API calls through to DirectX for higher perf. ( http://www.libsdl.org/intro.en/whatplatforms.html ) Microsoft have said that for Metro Game Apps you can only use DirectX (which means no XNA, no OpenGL, no SFML, etc, etc) My question is: If SDL just wraps DirectX calls will I (we) be able to use SDL to bring games to the new Metro WinRT environment and Windows 8 marketplace? This would be great if possible. Additionally as WinPhone 8 is supposedly built on Win8 then this could mean SDL would be available on the win phone in the future too. Thanks for your time in responding to this question and I look forward to hearing your response. EDIT: Based on DeadMG's answer I have installed Visual Studio 11 (beta) in Windows 8 Consumer Preview (CP) and went file-New to check project types. The project types: "Blank Application", "Direct2D Application" and "Direct3D Application" look of interest. I have selected "Direct2D App" but SDL generates its own window when you call: SDL_INIT Is it possible to link/setup the SDL window to point to the Direct2D surface in the this project?

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  • Unexpected SQL Server 2008 Performance Tip: Avoid local variables in WHERE clause

    - by Jim Duffy
    Sometimes an application needs to have every last drop of performance it can get, others not so much. We’re in the process of converting some legacy Visual FoxPro data into SQL Server 2008 for an application and ran into a situation that required some performance tweaking. I figured the Making Microsoft SQL Server 2008 Fly session that Yavor Angelov (SQL Server Program Manager – Query Processing) presented at PDC 2009 last November would be a good place to start. I was right. One tip among the list of incredibly useful tips Yavor presented was “local variables are bad news for the Query Optimizer and they cause the Query Optimizer to guess”. What that means is you should be avoiding code like this in your stored procs even though it seems such an intuitively good idea. DECLARE @StartDate datetime SET @StartDate = '20091125' SELECT * FROM Orders WHERE OrderDate = @StartDate Instead you should be referencing the value directly in the WHERE clause so the Query Optimizer can create a better execution plan. SELECT * FROM Orders WHERE OrderDate = '20091125' My first thought about this one was we reference variables in the form of passed in parameters in WHERE clauses in many of our stored procs. Not to worry though because parameters ARE available to the Query Optimizer as it compiles the execution plan. I highly recommend checking out Yavor’s session for additional tips to help you squeeze every last drop of performance out of your queries. Have a day. :-|

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  • Printing problem in Silverlight 4.0 RC - loading images in code behind

    - by Jacek Ciereszko
    Few days ago I faced a problem with printing in new Silverlight 4 RC. When you try to dynamically load image (in code behind) and print it, it doesn't work. Paper sheet is blank. Problem XAML file: <Image x:Name="image" Stretch="None" /> XAML.cs: image.Source = new BitmapImage(new Uri(imageUri, UriKind.RelativeOrAbsolute));  Print: var pd = new PrintDocument();   pd.PrintPage += (s, args) =>     {       args.PageVisual = image;     };   pd.Print(); Result: Blank paper.   Solution What you need to do, is forced Silverlight engine to load that image before printing start. To accomplish that I proposed simply checking PixelWith value. Your code will ask about PixelWidth of image so it will have to be loaded. XAML.cs: BitmapImage bImage = new BitmapImage(new Uri(imageUri, UriKind.RelativeOrAbsolute)); image.Source = bImage; InitControl(imageUri, movieUri, isLeft); int w = bImage.PixelWidth; int h = bImage.PixelHeight;   DONE!   Jacek Ciereszko

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  • How can I make my FireFox Browser AddOn Backwards Compatible?

    - by bwheeler96
    I'm making a firefox browser add-on, and I just got all of the code working fine, but it will only install in FireFox 16, and I want it to be compatible at least from 10+, has anyone dealt with this issue? I have my package.json pointing to my install.rdf, and my install.rdf clearly states target applications. Is there any additional setup I need? here is my package.json { "name": "firefox-ext", "license": "MPL 2.0", "author": "", "version": "0.1", "fullName": "firefox-ext", "id": "jid1-AMCw25iQJof53w", "description": "a basic add-on" } and here is my install.rdf. <?xml version="1.0"?> <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#"> <Description about="urn:mozilla:install-manifest"> <em:id>jid1-AMCw25iQJof53w</em:id> <em:name>Generic App</em:name> <em:version>1.0</em:version> <em:type>2</em:type> <em:creator>Brian Wheeler</em:creator> <em:description>Good Stuff</em:description> <em:targetApplication> <Description> <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <em:minVersion>1.0</em:minVersion> <em:maxVersion>19.0</em:maxVersion> </Description> </em:targetApplication> </Description> </RDF> I'm using the CFX CLI Tools to make this, so everything has been built and tested with cfx init, cfx run, and cfx xpi I just can't figure out compatibility with anything other than 16. Also, major bonus points if someone could explain the advantages of a rapid release cycle, because it really seems to have shot 3rd party Mozilla developers in the foot in terms of software compatibility. Thanks, -Brian

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  • In Joomla In htaccess REQUEST_URI is always returning index.php instead of SEF URL

    - by Saumil
    I have installed joomsef version 3.9.9 with the Joomla 1.5.25. Now I want to set https for some of the section of my site(e.g URI starts with /events/) while wanting rest of all urls on http.I am setting rules in .htaccess file but not getting output as expected. I am checking REQUEST_URI of the SEF urls but always getting index.php as URI. Here is my htaccess code. ########## Begin - Custom redirects # # If you need to redirect some pages, or set a canonical non-www to # www redirect (or vice versa), place that code here. Ensure those # redirects use the correct RewriteRule syntax and the [R=301,L] flags. # ########## End - Custom redirects # Uncomment following line if your webserver's URL # is not directly related to physical file paths. # Update Your Joomla! Directory (just / for root) # RewriteBase / ########## Begin - Joomla! core SEF Section # RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}] # # If the requested path and file is not /index.php and the request # has not already been internally rewritten to the index.php script RewriteCond %{REQUEST_URI} !^/index\.php # and the request is for root, or for an extensionless URL, or the # requested URL ends with one of the listed extensions RewriteCond %{REQUEST_URI} (/[^.]*|\.(php|html?|feed|pdf|raw))$ [NC] # and the requested path and file doesn't directly match a physical file RewriteCond %{REQUEST_FILENAME} !-f # and the requested path and file doesn't directly match a physical folder RewriteCond %{REQUEST_FILENAME} !-d # internally rewrite the request to the index.php script RewriteRule .* index.php [L] # ########## End - Joomla! core SEF Section # Here is my code e.g site url is http://mydomain.com/events RewriteCond %{REQUEST_URI} ^/(events)$ RewriteCond %{HTTPS} !ON RewriteRule (.*) https://%{REQUEST_HOST}%{REQUEST_URI}/$1 [L,R=301] I am not getting why REQUEST_URI is reffering index.php even though my url in address bar is like this http://mydomain.com/events . I am using JOOMSEF(Joomla extension for SEF URLS).If I am removing other rules from the htaccess file then joomla stops working. I am not getting a way to handle this as I am not expert.Please let me know if someone has passed through same situation and have solution or suggest some work around. Thanks

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  • How much detail is in a good UI regression test?

    - by GlenPeterson
    We use a detailed step-by-step user-interface regression test for our commercial web application. It has a "backbone" test for the most used / most important parts of the system, with optional tests for specific areas of functionality. Using this plan has definitely helped us ensure high quality software. But, having very specific tests can be counter-productive. The tester concentrates on following the test and will completely miss usability issues, or not notice fairly obvious problems such as the bottom part of a page that is missing. By contrast, some of the best UI testing happens when building a demo of a new feature. I often do my own best testing by pretending to demonstrate the system to an imaginary prospect. Yet when I tell the testers, "Just demonstrate the system to yourself" they don't cover nearly as much functionality as they do with a detailed point-by-point test. I'm repeatedly asked to provide more and more detail in the test plan so that a new untrained tester can test with it without asking any questions. Yet details seem to be counter-productive. How much detail do you put in a regression test to make it effective? What techniques make the tester to focus more on the system than on checking off items on the test?

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  • Search Work Items for TFS 2010 - New Extension

    - by MikeParks
    A few months ago I was constantly using Visual Studio 2008 with Team Foundation Server 2008. Searching for work items with queries inside Visual Studio became a pain until I found an add in that simplifed it into one little search box in the IDE.  It allowed me to enter some text in, hit the enter key, and it would bring back a list (aka open a .wiq file) of work items that matched the text entered. I became a huge fan of Noah Coad's Search Work Item Add In. He wrote a pretty good blog on how to use it as well. Of course when we upgraded to Visual Studio 2010 and Team Foundation Server 2010, the 2008 add in no longer worked. I didn't see any updates for it on codeplex to be 2010 compatible. Cory Cissell and I have published a few Visual Studio Extensions already so I figured I'd take a shot at making this tool 2010 compatible by turning it into an extension. Sure enough, it worked. We used it locally for a while and recently decided to publish it to the Visual Studio Gallery. If you are currently looking for an easy way to search work items in Visual Studio 2010, this is worth checking out. Big thanks goes out to Noah for originally creating this on codeplex. The extension we created can be downloaded here: http://visualstudiogallery.msdn.microsoft.com/en-us/3f31bfff-5ecb-4e05-8356-04815851b8e7      * Additional note: The default search fields are Title, History, and Description. If you want to modify which work item fields are searchable, type in "--template" (no quotes) into the search box and hit enter. This will open the search template. Just add another "Or" statement, pick the field name, select an operator, type "[search]" (no quotes) in the value field, and hit ctrl + s to save. The next time you run a search it will use the modified search template. That's all for now. Thanks! - Mike

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  • Why does my name resolution hit the DNS even with a hosts file entry?

    - by Volomike
    I'm running Ubuntu 10.04.2 LTS Desktop. Being a web developer, naturally I created a "me.com" in my /etc/hosts file. Unfortunately, my name resolution is going out to the DNS before first checking my local hosts entry and I can't figure out why. The end result is that if my /etc/resolv.conf contains "nameserver 127.0.0.1" in there first, then I get a response back in my web browser from me.com (local) within less than a second. But if I don't have that entry, then my response takes sometimes as much as 5 seconds if my ISP is a little slow. The problem was so troublesome that I actually had to file a question here (and someone resolved it) for how to automatically insert that entry into /etc/resolv.conf. But one of the users (@shellaholic) here highly recommended (and commented back and forth with me about it) that I should file this question. Do you know why my workstation's name resolution has to hit the DNS server first before hitting my /etc/hosts file entry? For now, I'm using the resolv.conf trick (see link above).

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  • Cannot delete .Trash-503 directory, returns a $RECYCLE.BIN.trashinfo: Input/output error

    - by Parto
    I cannot delete .Trash-503 folder via GUI or terminal, it returns a $RECYCLE.BIN.trashinfo: Input/output error Not even sudo rm -r or even a simple ls works in that trash directory. Check terminal output below: subroot@subroot:~$ cd /media/xxxxx/ subroot@subroot:/media/xxxxx$ rm .Trash-503/ rm: cannot remove `.Trash-503/': Is a directory subroot@subroot:/media/xxxxx$ rm -r .Trash-503/ rm: cannot remove `.Trash-503/info/$RECYCLE.BIN.trashinfo': Input/output error rm: cannot remove `.Trash-503/info/found.000.trashinfo': Input/output error rm: cannot remove `.Trash-503/info': Directory not empty subroot@subroot:/media/xxxxx$ sudo rm -r .Trash-503/ [sudo] password for subroot: rm: cannot remove `.Trash-503/info/$RECYCLE.BIN.trashinfo': Input/output error rm: cannot remove `.Trash-503/info/found.000.trashinfo': Input/output error subroot@subroot:/media/xxxxx$ cd .Trash-503/ subroot@subroot:/media/xxxxx/.Trash-503$ ls info subroot@subroot:/media/xxxxx/.Trash-503$ cd info/ subroot@subroot:/media/xxxxx/.Trash-503/info$ ls ls: cannot access $RECYCLE.BIN.trashinfo: Input/output error ls: cannot access found.000.trashinfo: Input/output error found.000.trashinfo $RECYCLE.BIN.trashinfo subroot@subroot:/media/xxxxx/.Trash-503/info$ What's going on here and how can I delete this folder? EDIT I tried checking and repairing the partition using gparted only to get this error message: ERROR: Filesystem check failed! ERROR: 264 clusters are referenced multiple times. NTFS is inconsistent. Run chkdsk /f on Windows then reboot it TWICE! The usage of the /f parameter is very IMPORTANT! No modification was and will be made to NTFS by this software until it gets repaired. I don't have windows installed, how can I run chkdsk /f from ubuntu?

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  • C# Simple Twitter Update

    - by mroberts
    For what it's worth a simple twitter update. 1: using System; 2: using System.IO; 3: using System.Net; 4: using System.Text; 5:   6: namespace Server.Actions 7: { 8: public class TwitterUpdate 9: { 10: public string Body { get; set; } 11: public string Login { get; set; } 12: public string Password { get; set; } 13:   14: public override void Execute() 15: { 16: try 17: { 18: //encode user name and password 19: string creds = Convert.ToBase64String(Encoding.ASCII.GetBytes(string.Format("{0}:{1}", this.Login, this.Password))); 20:   21: //encode tweet 22: byte[] tweet = Encoding.ASCII.GetBytes("status=" + this.Body); 23:   24: //setup request 25: HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://twitter.com/statuses/update.xml"); 26: request.Method = "POST"; 27: request.ServicePoint.Expect100Continue = false; 28: request.Headers.Add("Authorization", string.Format("Basic {0}", creds)); 29: request.ContentType = "application/x-www-form-urlencoded"; 30: request.ContentLength = tweet.Length; 31:   32: //write to stream 33: Stream reqStream = request.GetRequestStream(); 34: reqStream.Write(tweet, 0, tweet.Length); 35: reqStream.Close(); 36:   37: //check response 38: HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 39:   40: //... 41: } 42: catch (Exception e) 43: { 44: //... 45: } 46: } 47: } 48: }   BTW, this is my first blog post.  Nothing earth shattering, I admit, but I needed to figure out how to post formatted code.  In the past I’ve used Alex Gorbatchev’s Syntax Highlighter with great success, but here at GWB I couldn’t get it to work. Windows Live Writer though, being a stand alone writer, worked with no problems.  For now, that’s what I’ll use.

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  • Why is there never any controversy regarding the switch statement? [closed]

    - by Nick Rosencrantz
    We all know that the gotostatement should only be used on very rare occasions if at all. It has been discouraged to use the goto statement countless places countless times. But why it there never anything like that about the switch statement? I can understand the position that the switch statement should always be avoided since anything with switch can always be expressed by if...else... which is also more readable and the syntax of the switch statement if difficult to remember. Do you agree? What are the arguments in favor of keeping the 'switch` statement? It can also be difficult to use if what you're testing changes from say an integer to an object, then C++ or Java won't be able to perform the switch and neither C can perform switch on something like a struct or a union. And the technique of fall-through is so very rarely used that I wonder why it was never presented any regret of having switch at all? The only place I know where it is best practice is GUI code and even that switch is probably better coded in a more object-oriented way.

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  • null pointers vs. Null Object Pattern

    - by GlenH7
    Attribution: This grew out of a related P.SE question My background is in C / C++, but I have worked a fair amount in Java and am currently coding C#. Because of my C background, checking passed and returned pointers is second-hand, but I acknowledge it biases my point of view. I recently saw mention of the Null Object Pattern where the idea is than an object is always returned. Normal case returns the expected, populated object and the error case returns empty object instead of a null pointer. The premise being that the calling function will always have some sort of object to access and therefore avoid null access memory violations. So what are the pros / cons of a null check versus using the Null Object Pattern? I can see cleaner calling code with the NOP, but I can also see where it would create hidden failures that don't otherwise get raised. I would rather have my application fail hard (aka an exception) while I'm developing it than have a silent mistake escape into the wild. Can't the Null Object Pattern have similar problems as not performing a null check? Many of the objects I have worked with hold objects or containers of their own. It seems like I would have to have a special case to guarantee all of the main object's containers had empty objects of their own. Seems like this could get ugly with multiple layers of nesting.

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  • Notes for a NetBeans IDE 7.4 HTML5 Screencast

    - by Geertjan
    I'm making a screencast that intends to thoroughly introduce NetBeans IDE 7.4 as a tool for HTML, JavaScript, and CSS developers. Here's the current outline, additions and other suggestions are welcome. Getting Started Downloading NetBeans IDE for HTML5 and PHP Examining the NetBeans installation directory, especially netbeans.conf Examining the NetBeans user directory Command line options for starting NetBeans IDE Exploring NetBeans IDE Menus and toolbars Versioning tools Options Window Go through whole Options window Change look and feels Adding themes Syntax coloring Code templates Plugin Manager and Plugin Portal Dark Look and Feel Themes Toggle line wrap Emmet HTML Tidy NetBeans Cheat Sheets Creating HTML5 projects From scratch From online template, e.g., Twitter Bootstrap From ZIP file From folder on disk From sample Editing Useful shortcuts Alt-Enter: see the current hints Alt-Shift-DOT/COMMA: expand selection (CTRL instead of Alt on Mac) Ctrl-Shift-Up/Down: copy up/down Alt-Shift-Up/Down: move up/down Alt-Insert: generate code (Lorum Ipsum) View menu | Show Non-printable Characters Source menu Show keyboard shortcut card Useful hints Surround with Tag Remove Surrounding Tag Useful code completion Link tag for CSS, show completion Script tag for JavaScript, show completion Create code templates in Options window Useful HTML Palette items Unordered List Link Useful code navigation Navigator Navigate menu Useful project settings Project-level deployment settings CSS Preprocessors (SASS/LESS) Cordova support Useful window management Dragging, minimizing, undocking Ctrl-Shift-Enter: distraction-free mode Alt-Shift Enter: maximization Debugging JavaScript debugger Deploying Embedded browser Responsive design Inspect in NetBeans mode Chrome browser with NetBeans plugin Android and iOS browsers Cordova makes native packages On device debugging On device styling Documentation PHP and HTML5 Learning Trail: https://netbeans.org/kb/trails/php.html Contributing Social Media: Twitter, Facebook, blogs Plugin Portal Planning to complete the above screencast this week, will continue editing this page as more useful features arise in my mind or hopefully in the comments in this blog entry!

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  • Teaching myself, as a physicist, to become a better programmer

    - by user787267
    I've always liked physics, and I've always liked coding, so when I got the offer for a PhD position doing numerical physics (details are not relevant, it's mostly parallel programming for a cluster) at a university, it was a no-brainer for me. However, as most physicists, I'm self taught. I don't have broad background knowledge about how to code in an object oriented way, or the name of that specific algorithm that optimizes the search in some kD tree. Since all my work so far has been more concerned about the physics and the scientific results, I undoubtedly have some bad habits - more so because my coding is my own, and not really teamwork. I have mostly used C since it is very straightforward and "what you write is what you get" - no need for fancy abstractions. However, I have recently switched to C++ since I'd like to learn more about the power that comes with abstraction, and it's pretty C-like (syntax-wise at least). How do I teach myself to code in a good, abstract way like a graduate in computer science? I know my code is efficient, but I want it to be elegant as well, and readable. Keep in mind that I don't have time to read several 1000-page tomes about abstract programming. I need to spend time on actual, physics related research (my supervisor would laugh at me if he knew I spent time thinking about how to program elegantly). How do I assess if my work is also good from a programmer's perspective?

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  • Where can I find out the following info on python (coming from Ruby)

    - by Michael Durrant
    I'm coming from Ruby and Ruby on Rails to Python. Where can I find or find resources about: The command prompt, what is python's version of 'irb' django, what is a good resource for installing, using, etc. pythoncasts... is there anything like railscats, i.e. good video tutorials web sites with the api info about what version have what and which to use. info and recommendations on editors, plugins and IDE's common gotchas for newbies and good things to know at the outset scaling issues, common reasons what is the equivalent of 'gems', i.e. components I can plug in what are popular plugins for django authentication and forms similar to devise and simple_form testing, what's available, anything similar to rspec? database adapters - any preferences? framework info - is django MVC like rails? OO'yness. Is everything an object that gets send messages? Different paradign? syntax - anything like jslint for checking for well-formed code?

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  • lucid 10.04 LTS => Precise 12.04.1 : upgrade doesn't work

    - by Rastom
    I googled and looked into all unkown issues on ubuntu forums but I can't figure out why a 10.04 LTS server won't detect the last LTS 12.04.1. I guess since 12.04 is a fresh dist, not much is reported for related issues Here is what I did : apt-get update apt-get upgrade apt-get install update-manager-core it was already installed so no update for this package. I checked : /etc/update-manager/release-upgrades [DEFAULT] # Default prompting behavior, valid options: # # never - Never check for a new release. # normal - Check to see if a new release is available. If more than one new # release is found, the release upgrader will attempt to upgrade to # the release that immediately succeeds the currently-running # release. # lts - Check to see if a new LTS release is available. The upgrader # will attempt to upgrade to the first LTS release available after # the currently-running one. Note that this option should not be # used if the currently-running release is not itself an LTS # release, since in that case the upgrader won't be able to # determine if a newer release is available. Prompt=lts I also checked my sourcelist before running apt-get : /etc/apt/sources.list deb http://archive.ubuntu.com/ubuntu/ lucid main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-security main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ lucid-updates main restricted universe multiverse deb http://security.ubuntu.com/ubuntu lucid-security main restricted deb-src http://security.ubuntu.com/ubuntu lucid-security main restricted deb http://security.ubuntu.com/ubuntu lucid-security universe deb-src http://security.ubuntu.com/ubuntu lucid-security universe deb http://security.ubuntu.com/ubuntu lucid-security multiverse deb-src http://security.ubuntu.com/ubuntu lucid-security multiverse # deb http://landscape.canonical.com/packages/hardy ./ # deb-src http://landscape.canonical.com/packages/hardy ./ and then following Ubuntu guide for Precise upgrade the command below should work : root@xxxxxxxxx:/etc/apt# do-release-upgrade -d Checking for a new ubuntu release No new release found So am I missing something ? The server was accessing outside through a proxy but I grant direct access to this server to avoid any Internet access problem or redirection but no clue... Any help would be appreciated

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  • Can Foswiki be used as a distributed Redmine replacement? [closed]

    - by Tobias Kienzler
    I am quite familiar with and love using git, among other reasons due to its distributed nature. Now I'd like to set up some similarly distributed (FOSS) Project Management software with features similar to what Redmine offers, such as Issue & time tracking, milestones Gantt charts, calendar git integration, maybe some automatic linking of commits and issues Wiki (preferably with Mathjax support) Forum, news, notifications Multiple Projects However, I am looking for a solution that does not require a permanently accesible server, i.e. like in git, each user should have their own copy which can be easily synchronized with others. However it should be possible to not have a copy of every Project on every machine. Since trac uses multiple instances for multiple projects anyway, I was considering using that, but I neither know how well it adapts to simply giting the database itself (which would be be easiest way to handle the distribution due to git being used anyway), nor does it include all of Redmine's feature. After checking http://www.wikimatrix.org for Wikis with integrated tracking system and RCS support, and filtering out seemingly stale project, the choices basically boil down to Foswiki, TWiki and Ikiwiki. The latter doesn't seem to offer as many usability features, and in the TWiki vs Foswiki issue I tend to the latter. Finally, there is Fossil, which starts from the other end by attempting to replace git entirely and tracking itself. I am however not too comfortable with the thought of replacing git, and Fossil's non-SCM features don't seem to be as developed. Now before I invest too much time when someone else might already have tried this, I basically have two questions: Are there crucial features of Project Management software like Redmine that Foswiki does not provide even with all the extensions available? How to set Foswiki up to use git instead of the perl RcsLite?

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  • How to diagnose and fix Kernel Panic Fatal Machine Check error?

    - by 0x4a6f4672
    I have got a new Samsung Series 7 laptop with dual boot setup for Windows 8 and Ubuntu 12.10. A fine machine comparable to a Macbook Pro. The Ubuntu installation was quite a hassle, but with the help of Boot Repair finally it seemed to work. Or so I thought. Windows 8 starts fine, but if I want to start Ubuntu regularly the following Machine Check Exception error occurs, quite similar to this one [Hardware Error] CPU 1: Machine Check Exception: 5 Bank 6 [Hardware Error] RIP !inexact! 33 <00007fab2074598a> [Hardware Error] TSC 95b623464c ADDR fe400 MISC 3880000086 .. [similar messages for CPU 2,3 and 0] .. [Hardware Error] Machine Check: Processor context corrupt Kernel panic - not syncing: Fatal Machine Check Rebooting in 30 seconds Kernel panic does not sound good. Then it starts to reboot, and the second boot trial often works. Is it a Kernel or driver problem? The laptop has an Intel Core i7 processor. I already deactivated Hyperthreading in the BIOS, but it does not seem to help :-( I also disabled the Execute Disable Bit (EDB) flag in the BIOS. EDB is an Intel hardware-based security feature that can help reduce system exposure to viruses and malicious code. Since I disabled it, the error did occur less frequently, but it still appears occasionally :-( It seems to be the same error as described here and here. Maybe a Samsung specific Kernel problem? A similar error also happens on a Samsung Ultrabook Series 9 (which seems to be kernel bugs 49161 and 47121). At my Samsung Series 7, it still occurs for instance during booting on battery after "Checking battery state". Perhaps anyone else has an idea? These Kernel Panic errors are reallly annoying..

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  • Inline Image in ASP.NET

    - by Ricardo Peres
    Inline images is a technique that, instead of referring to an external URL, includes all of the image’s content in the HTML itself, in the form of a Base64-encoded string. It avoids a second browser request, at the cost of making the HTML page slightly heavier and not using cache. Not all browsers support it, but current versions of IE, Firefox and Chrome do. In order to use inline images, you must write the img element’s src attribute like this: 1: <img src="data:image/gif;base64,R0lGODlhEAAOALMAAOazToeHh0tLS/7LZv/0jvb29t/f3//Ub/ 2: /ge8WSLf/rhf/3kdbW1mxsbP//mf///yH5BAAAAAAALAAAAAAQAA4AAARe8L1Ekyky67QZ1hLnjM5UUde0ECwLJoExKcpp 3: V0aCcGCmTIHEIUEqjgaORCMxIC6e0CcguWw6aFjsVMkkIr7g77ZKPJjPZqIyd7sJAgVGoEGv2xsBxqNgYPj/gAwXEQA7" 4: width="16" height="14" alt="embedded folder icon"/> The syntax is: data:[<mediatype>][;base64],<data> I developed a simple control that allows you to use inline images in your ASP.NET pages. Here it is: 1: public class InnerImage: Image 2: { 3: protected override void OnInit(EventArgs e) 4: { 5: String imagePath = this.Context.Server.MapPath(this.ImageUrl); 6: String extension = Path.GetExtension(imagePath).Substring(1); 7: Byte[] imageData = File.ReadAllBytes(imagePath); 8:  9: this.ImageUrl = String.Format("data:image/{0};base64,{1}", extension, Convert.ToBase64String(imageData)); 10:  11: base.OnInit(e); 12: } 13: } Simple, don’t you think?

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  • How to build MVC Views that work with polymorphic domain model design?

    - by Johann de Swardt
    This is more of a "how would you do it" type of question. The application I'm working on is an ASP.NET MVC4 app using Razor syntax. I've got a nice domain model which has a few polymorphic classes, awesome to work with in the code, but I have a few questions regarding the MVC front-end. Views are easy to build for normal classes, but when it comes to the polymorphic ones I'm stuck on deciding how to implement them. The one (ugly) option is to build a page which handles the base type (eg. IContract) and has a bunch of if statements to check if we passed in a IServiceContract or ISupplyContract instance. Not pretty and very nasty to maintain. The other option is to build a view for each of these IContract child classes, breaking DRY principles completely. Don't like doing this for obvious reasons. Another option (also not great) is to split the view into chunks with partials and build partial views for each of the child types that are loaded into the main view for the base type, then deciding to show or hide the partial in a single if statement in the partial. Also messy. I've also been thinking about building a master page with sections for the fields that only occur in subclasses and to build views for each subclass referencing the master page. This looks like the least problematic solution? It will allow for fairly simple maintenance and it doesn't involve code duplication. What are your thoughts? Am I missing something obvious that will make our lives easier? Suggestions?

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