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Articles indexed in March 2010

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• PostgreSQL 8.4 won't start after blackout

  - by RiZe

  I have problem with starting PostgreSQL 8.4 on Ubuntu 9.10 Server after blackout. When I try to connect to the database it says: psql: server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request. When I try to start it by using command sudo -u postgres /etc/init.d/postgresql-8.4 start * Starting PostgreSQL 8.4 database server [ OK ] Netstat output netstat -tulp (No info could be read for "-p": geteuid()=1000 but you should be root.) Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 localhost:postgresql *:* LISTEN - tcp 0 0 192.168.1.35:svn *:* LISTEN - tcp 0 0 192.168.1.35:http-alt *:* LISTEN - tcp 0 0 *:ssh *:* LISTEN - tcp6 0 0 localhost:postgresql [::]:* LISTEN - tcp6 0 0 [::]:ssh [::]:* LISTEN - udp 0 0 *:bootpc *:* - But still don't work so lets restart it sudo -u postgres /etc/init.d/postgresql-8.4 restart * Restarting PostgreSQL 8.4 database server * The PostgreSQL server failed to start. Please check the log output: 2009-11-30 13:39:37 CET LOG: database system was shut down at 2009-11-30 13:39:33 CET 2009-11-30 13:39:37 CET LOG: autovacuum launcher started 2009-11-30 13:39:37 CET LOG: database system is ready to accept connections 2009-11-30 13:39:37 CET LOG: incomplete startup packet 2009-11-30 13:39:38 CET LOG: server process (PID 2240) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:38 CET LOG: terminating any other active server processes 2009-11-30 13:39:38 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:38 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:37 CET 2009-11-30 13:39:38 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:38 CET LOG: record with zero length at 0/11D464C 2009-11-30 13:39:38 CET LOG: redo is not required 2009-11-30 13:39:38 CET LOG: autovacuum launcher started 2009-11-30 13:39:38 CET LOG: database system is ready to accept connections 2009-11-30 13:39:38 CET LOG: server process (PID 2248) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:38 CET LOG: terminating any other active server processes 2009-11-30 13:39:38 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:38 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:38 CET 2009-11-30 13:39:38 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:38 CET LOG: record with zero length at 0/11D4690 2009-11-30 13:39:38 CET LOG: redo is not required 2009-11-30 13:39:39 CET LOG: autovacuum launcher started 2009-11-30 13:39:39 CET LOG: database system is ready to accept connections 2009-11-30 13:39:39 CET LOG: server process (PID 2256) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:39 CET LOG: terminating any other active server processes 2009-11-30 13:39:39 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:39 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:38 CET 2009-11-30 13:39:39 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:39 CET LOG: record with zero length at 0/11D46D4 2009-11-30 13:39:39 CET LOG: redo is not required 2009-11-30 13:39:39 CET LOG: autovacuum launcher started 2009-11-30 13:39:39 CET LOG: database system is ready to accept connections 2009-11-30 13:39:39 CET LOG: server process (PID 2264) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:39 CET LOG: terminating any other active server processes 2009-11-30 13:39:39 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:39 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:39 CET 2009-11-30 13:39:39 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:40 CET LOG: record with zero length at 0/11D4718 2009-11-30 13:39:40 CET LOG: redo is not required 2009-11-30 13:39:40 CET LOG: autovacuum launcher started 2009-11-30 13:39:40 CET LOG: database system is ready to accept connections 2009-11-30 13:39:40 CET LOG: server process (PID 2272) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:40 CET LOG: terminating any other active server processes 2009-11-30 13:39:40 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:40 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:40 CET 2009-11-30 13:39:40 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:40 CET LOG: record with zero length at 0/11D475C 2009-11-30 13:39:40 CET LOG: redo is not required 2009-11-30 13:39:40 CET LOG: autovacuum launcher started 2009-11-30 13:39:40 CET LOG: database system is ready to accept connections 2009-11-30 13:39:41 CET LOG: server process (PID 2280) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:41 CET LOG: terminating any other active server processes 2009-11-30 13:39:41 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:41 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:40 CET 2009-11-30 13:39:41 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:41 CET LOG: record with zero length at 0/11D47A0 2009-11-30 13:39:41 CET LOG: redo is not required 2009-11-30 13:39:41 CET LOG: autovacuum launcher started 2009-11-30 13:39:41 CET LOG: database system is ready to accept connections 2009-11-30 13:39:41 CET LOG: server process (PID 2288) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:41 CET LOG: terminating any other active server processes 2009-11-30 13:39:41 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:41 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:41 CET 2009-11-30 13:39:41 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:41 CET LOG: record with zero length at 0/11D47E4 2009-11-30 13:39:41 CET LOG: redo is not required 2009-11-30 13:39:41 CET LOG: autovacuum launcher started 2009-11-30 13:39:41 CET LOG: database system is ready to accept connections 2009-11-30 13:39:42 CET LOG: server process (PID 2296) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:42 CET LOG: terminating any other active server processes 2009-11-30 13:39:42 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:42 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:41 CET 2009-11-30 13:39:42 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:42 CET LOG: record with zero length at 0/11D4828 2009-11-30 13:39:42 CET LOG: redo is not required 2009-11-30 13:39:42 CET LOG: autovacuum launcher started 2009-11-30 13:39:42 CET LOG: database system is ready to accept connections 2009-11-30 13:39:42 CET LOG: server process (PID 2304) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:42 CET LOG: terminating any other active server processes 2009-11-30 13:39:42 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:42 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:42 CET 2009-11-30 13:39:42 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:42 CET LOG: record with zero length at 0/11D486C 2009-11-30 13:39:42 CET LOG: redo is not required 2009-11-30 13:39:43 CET LOG: autovacuum launcher started 2009-11-30 13:39:43 CET LOG: database system is ready to accept connections 2009-11-30 13:39:43 CET LOG: server process (PID 2312) was terminated by signal 11: Segmentation fault 2009-11-30 13:39:43 CET LOG: terminating any other active server processes 2009-11-30 13:39:43 CET LOG: all server processes terminated; reinitializing 2009-11-30 13:39:43 CET LOG: database system was interrupted; last known up at 2009-11-30 13:39:42 CET 2009-11-30 13:39:43 CET LOG: database system was not properly shut down; automatic recovery in progress 2009-11-30 13:39:43 CET LOG: record with zero length at 0/11D48B0 2009-11-30 13:39:43 CET LOG: redo is not required 2009-11-30 13:39:43 CET LOG: autovacuum launcher started 2009-11-30 13:39:43 CET LOG: database system is ready to accept connections [fail] So what happened and what can I do to solve this? Thanks for replies

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• Simple Webserver failover

  - by yummm

  I will be running a dynamic web site and if the server ever is to stop responding, I'd like to failover to a static website that displays a "We are down for maintenance" page. I have been reading and I found that switching the DNS dynamically may be an option, but how quick will that change take place? And will everyone see the change immediately? Are there any better ways to failover to another server?

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• outlook signature problem

  - by user20989

  i have created signature for my windows mail signature html file has following code. <table border="0" cellspacing="0" cellpadding="0"> <tr> <td>Regards</td> </tr> <tr> <td><img src="http://images.google.com/intl/en_ALL/images/logos/images_logo_lg.gif" align="Signature Picture" /></td> </tr> </table> its working fine once i send message, but when if i foreword send item again i got signature but image not display. once i check the source of email i found following change in signature image automatically like <IMG height=128 alt="Compnay Logo" src="mhtml:{4B829C94-37FC-44B9-A60C-CC4BB1E0AE9B}mid://00000152/!http://images.google.com/intl/en_ALL/images/logos/images_logo_lg.gif" width=206 border=0> how to fix it. or any other way to put image in signature (not image is also hosted on web server) Thanks

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• How can I perform business/programming/mindmap 'modeling' in 3d?

  - by ropstah

  Are there any possibilities of modeling in a 3d environment? Not in a Maya or 3d studio MAX way (which I do not have any experience with), but in a UML diagram software kind of way..?

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• Basic Scolling Question

  - by localgamer

  Hey guys, im pretty new to android platform and have a really simple question. Im putting buttons as layouts with text boxes, but im running out of room. How would i make it possible for the user to scroll down to view more buttons and stuff. For example, if i have 6 buttons, and 3 are in the field of view, i wanna be able to scroll with my finger and be able to see those buttons as I scroll. Thanks for the help guys -Localgamer

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• For Loop Question?

  - by NextRev

  I'm programming an app for the iPhone. I'm not very good with loops just yet. How do I shorten this code into a for loop? if(CGRectContainsRect([space1 frame], [box frame])){ space1.image = [UIImage imageNamed:@"box.png"]; } else if(CGRectContainsRect([space2 frame], [box frame])){ space2.image = [UIImage imageNamed:@"box.png"]; } else if(CGRectContainsRect([space3 frame], [box frame])){ space3.image = [UIImage imageNamed:@"box.png"]; } else if(CGRectContainsRect([space4 frame], [box frame])){ space4.image = [UIImage imageNamed:@"box.png"]; } else if(CGRectContainsRect([space5 frame], [box frame])){ space5.image = [UIImage imageNamed:@"box.png"]; }

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• Standardizing a Release/Tools group on a specific language

  - by grahzny

  I'm part of a six-member build and release team for an embedded software company. We also support a lot of developer tools, such as Atlassian's Fisheye, Jira, etc., Perforce, Bugzilla, AnthillPro, and a couple of homebrew tools (like my Django release notes generator). Most of the time, our team just writes little plugins for larger apps (ex: customize workflows in Anthill), long-term utility scripts (package up a release for QA), or things like Perforce triggers (don't let people check into a specific branch unless their change description includes a bug number; authenticate against Active Directory instead of Perforce's internal passwords). That's about the scale of our problems, although we sometimes tackle something slightly more sizable. My boss, who is reasonably technical, has asked us to standardize on one or two languages so we can more easily substitute for each other. He's advocating bash scripts and Perl, due to their universality and simplicity. I can see his point--we mostly do "glue", so why not use "glue" languages rather than saddle ourselves with something designed for much larger projects? Since some of the tools we work with are Java-based, we do need to use something that speaks JVM sometimes. (The path of least resistance for these projects is BeanShell and Groovy.) I feel a tremendous itch toward language advocacy, but I'm trying to avoid saying "We should use Python 'cause I like it and Perl is gross." Instead, I'm trying to come up with a good approach to defining our problem set: what problems do we solve with scripts? Would we benefit from a library of common functions by our team, or are most of our projects more isolated? What is it reasonable to expect my co-workers to learn? What languages give us the most ease of development and ease of modification? Can you folks suggest some useful ways to approach this problem, both for my own thinking process and to help me facilitate some brainstorming among my coworkers?

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• List of Lua derived VMs and Languages

  - by Shane Holloway

  Is there a compendium of virtual machines and languages derived or inspired by Lua? By derived, I mean usage beyond embedding and extending with modules. I'm wanting to research the Lua technology tree, and am looking for our combined knowledge of what already exists. Current List: Bright - A C-like Lua Derivative http://bluedino.net/luapix/Bright.pdf Agena - An Algol68/SQL like Lua Derivative http://agena.sourceforge.net/ LuaJIT - A (very impressive) JIT for Lua http://luajit.org MetaLua - An ML-style language extension http://metalua.luaforge.net/

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• Automatic e-mail processing

  - by Jon Harrop

  I'd like to write a .NET application in F# to automate some of the processing of my e-mails. For example, when an order comes in my program might compute a new htpasswd from the e-mail's contents, upload it to our web server and reply to the customer with login details. How do people do this? I've tried Outlook 2007 automation but it just prompts the user for security and my attempts to get it to stop doing this have failed so I cannot automate anything with it. Is there a .NET-friendly e-mail client I can use more easily? This has been so tedious that I'm seriously considering writing my own .NET-friendly e-mail client...

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• .Net MEF newbie question

  - by steve.macdonald

  I am missing something basic when it comes to using MEF. I got it working using samples and a simple console app where everything is in the same assembly. Then I put some imports and exports in a separate project which contains various entities. I want to use these entities in an MS Test, but the composition is never actually done. When I move the composition stuff into the constructor of an entity in question it works, but that's obviously wrong. Does GetExecutingAssembly only "see" the test process? What am I missing re containers? I tried putting the container in a Using in the test without luck. The MEF docs are still very scant and I can't find a simple example of an application (or MS Test) which uses entities from a different project...

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• Windows SBS 2003 DNS taking over network

  - by Simon

  I have Windows Small Business Server 2003 premium edition on my new server box, this hosts a webapp on IIS. It has set up a DNS Server to solve requests to the webapp. I have a linux server/router that has does DNAT and portforwards port 80 to the new box. My linux router serves as a firewall and dhcp When i plug the SBS2003 server to the network, it leaves everyone on my network without web browsing, it looks like the DNS requests are going to the new server. I configured the DNS forwarders on SBS2003 to my ISP dns but it doesnt work... Is there something i am missing?

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• fedora apache/nginx pylons

  - by microchasm

  I'm trying to wrap my head around Pylons and how it works. So far... it's been confusing... I'm using EC2 with Fedora8. Everything is working so far (i.e. I have Pylons/python et al installed and after creating a test app and running paster serve I can access the default page via my domain name). As the Pylons docs explain and as I understand, the built in paster serve server is not suited for a production environment. What I am not clear on, then, is what to do next... It seems like nginx is a good option, but I am more familiar with Apache (like .0002%). I plan on having virtualhosts (which nginx says can accomodate). However, I am totally unclear on how the big picture is supposed to work. In order to serve an app, does paster serve need to be running? Does then nginx/apache basically just act as a proxy to shuttle connections to the paster server? How do I start it so it doesn't terminate after closing the ssh connection? If running multiple apps, what do I set as the host/port in development.ini to differentiate the apps? Or if this is not the right way, how do I differentiate beween apps? I am more familiar with MySQL, but willing to negotiate PostgreSQL if it's a better fit. Is it? Is virtualenv a prerequisite to running multiple apps on the same machine? Thanks in advance for any tips.

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• Knowledge base web app -- need a demo mode

  - by Smandoli

  I was contracted to build an on-line knowledge base that searches and cross-references many thousands of replacement parts for a niche industry. My client furnishes this app to his customers on a subscription basis. It uses MySQL and PHP and it works great. I want to deploy it in "demo mode" to sell my skills. I want the user to see the functions, but I have to guard the data for my client. My first idea was to obfuscate the results. That's at cross-purposes with showing how well it searches. I'm considering a limit on how many searches you can perform, but that's awkward too as someone could visit every day and get more answers than we would prefer. Other posts I've found are about letting people interact with an app, but without the challenge of protecting a big knowledge base. Can you suggest an approach? (Note, I put the tag obfuscation, but not sure it applies because java code obfuscation seems to be unrelated.)

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• Exporting SQL Server Databases for offline use

  - by WedTM

  I have a desktop application (C# .NET 3.5) that uses a SQL server for it's database. I have had a request from the client, however, to make it possible to export the database as it stands, and be able to use it on a laptop without connectivity. They understand that updates to the parent server will not be reflected in these offline clients. Is there a way I can just save the DataSet's to a binary form and write them to a disk and send those files to the offline clients.

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• Is there anything RAD comparible to VCL?

  - by mawg

  After years in embedded programmking, I have to develop a windows app. I dug out my old C++ builder and Delphi. These are great and the latest version costs over $1k, so I won't be going there. What I prarticularly like is the VCL (visual component library) which let's me code my own components and share them with others, plus the thousands of existing 3rd party components. I noticed that there is now also a RAD PHP form Borland too. I realzie that MSVC, QT, NetBEans, etc are good enough IDEs for RAD, _BUT_ does anything offer the ease of the Borland products for developing additional components - and does anything else have thousands to choose from? PC based? Cross-platform is good. Browser based? Free is always good ;-) I don't particularly care about the programming language.

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• Why for only some actions must I call setTarget?

  - by Max Pierce

  For most actions, I just click and drag in InterfaceBuilder to "wire up" a call from some interface object to my code. For example, if I want to know when the user single-clicks a row in a table, I drag a connection from the table's action to my controller's action. But now let's consider the user double-clicking a row. If I want one of my actions to be called when this happens, I need to call not only -[NSTableView setDoubleAction] but also -[NSControl setTarget]. Why? To be clear, I am not asking why Interface Builder doesn't support setDoubleAction. All tools have limitations. I am trying to gain a greater understanding about how and why setTarget doesn't seem to be necessary unless and until I want setDoubleAction to work. Another way to ask this question would be: Why don't I need to do anything in Interface Builder to set the target of the table's (single-click) action?

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• communication between two JVMs ?

  - by JavaUser

  Hi, How two/multiple JVMs running in a same machince can communicate without RMI ?. Thx

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• Make a text field highlighted when tabbed to in NetBeans (Java)

  - by typoknig

  Hi all, I'm trying to make it so when I tab to some text fields on in my JFrame the data in the text field will be highlighted. I thought I had done this in the properties before but I am not seeing the option now. Does anyone know how to do this?

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• How to make button on LinearLayout dynamically ?

  - by user164589

  Hi guys, I am trying to make a button programmable way (no attributes on LinearLayout). In other words, button count on the View is dynamically. How to make it ? Thanks

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• Load image dynamically on Silverlight

  - by FelixMM

  I have a Silverlight app that has to load an image dynamically, depending on the image name. The approach that im taking right now is passing the image name by query string to the page and passing that as a param to the Silverlight objet tag This is the query string passed Response.Redirect("Build.aspx?img=" + this.PictureUploader.PostedFile.FileName; And I try to pass it to Silverlight like this: <object id="SilverlightObject" data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%"> <param name="source" value="Silverlight/iMapsSL.xap"/> <param name="onError" value="onSilverlightError" /> <param name="background" value="white" /> <param name="minRuntimeVersion" value="3.0.40624.0" /> <param name="autoUpgrade" value="true" /> <param name="image" value="<%# Request.QueryString["img"] %>" /> <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style="text-decoration:none"> <img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style:none"/> </a> </object><iframe id="_sl_historyFrame" style="visibility:hidden;height:0px;width:0px;border:0px"></iframe> in the last param tag with name=image value= Requerst.QueryString I catch the image inside the Silverlight app like this private void Application_Startup(object sender, StartupEventArgs e) { string pictureName = ""; if (e.InitParams != null && e.InitParams.Count > 0) { pictureName = e.InitParams["image"]; this.RootVisual = new MainPage(pictureName); } else { this.RootVisual = new MainPage(); } } And when MainPage starts, I set the image source of the Image control like this this.Image.Source = new BitmapImage(new Uri(pictureName, UriKind.RelativeOrAbsolute)); But Silverlight loads without an image, any help someone?

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• What is Perl's equivalent to awk's /text/,/END/ ?

  - by kSiR

  I am looking to replace a nasty shell script that uses awk to trim down some HTML. The problem is I cannot find anything in Perl that does the aforementioned function awk '/<TABLE\ WIDTH\=\"100\%\" BORDER\=1\ CELLSPACING\=0><TR\ class\=\"tabhead\"><TH>State<\/TH>/,/END/' How can I do this in Perl? the expected output would be <TABLE WIDTH="100%" BORDER=1 CELLSPACING=0><TR class="tabhead"><TH>State</TH> The Perl flipflop operator gives me WAY more. (Everything between the asterisks is junk) *<h2>Browse Monitors (1 out of 497)</h2><br><font size="-1" style="font-weight:normal"> Use the <A HREF=/SiteScope/cgi/go.exe/SiteScope?page=monitorSummary&account=login15 >Monitor Description Report</a> to view current monitor configuration settings.</font>*<TABLE WIDTH="100%" BORDER=1 CELLSPACING=0><TR class="tabhead"><TH>State</TH>

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• Debian 5 server is randomly shutting down.

  - by revofreak

  My debian 5 vps is suffering from random shutdowns. I reinstalled it several times, the hosts moved me to a different physical box, check the install image and said everyone else also uses it and is fine. Heres the output from syslog Mar 27 00:19:19 noobintraining-1 -- MARK -- Mar 27 00:32:01 noobintraining-1 shutdown[18142]: shutting down for system halt Mar 27 00:32:06 noobintraining-1 init: Switching to runlevel: 0 Mar 27 00:32:06 noobintraining-1 xinetd[15907]: Exiting... Mar 27 00:32:07 noobintraining-1 named[15865]: received control channel command 'stop -p' Mar 27 00:32:07 noobintraining-1 named[15865]: shutting down: flushing changes Mar 27 00:32:07 noobintraining-1 named[15865]: stopping command channel on 127.0.0.1#953 Mar 27 00:32:07 noobintraining-1 named[15865]: stopping command channel on ::1#953 Mar 27 00:32:07 noobintraining-1 named[15865]: no longer listening on ::#53 Mar 27 00:32:07 noobintraining-1 named[15865]: no longer listening on 127.0.0.1#53 Mar 27 00:32:07 noobintraining-1 named[15865]: no longer listening on 89.238.172.132#53 Mar 27 00:32:07 noobintraining-1 named[15865]: exiting Mar 27 00:32:07 noobintraining-1 exiting on signal 15 Any help is most appreciated!

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• Protecting Content with AuthLogic

  - by Rob Wilkerson

  I know this sounds like a really, really simple use case and I'm hoping that it is, but I swear I've looked all over the place and haven't found any mention of any way - not even the best way - of doing this. I'm brand-spanking new to Ruby, Rails and everything surrounding either (which may explain a lot). The dummy app that I'm using as my learning tool requires authentication in order to do almost anything meaningful, so I chose to start by solving that problem. I've installed the AuthLogic gem and have it working nicely to the extent that is covered by the intro documentation and Railscast, but now that I can register, login and logout...I need to do something with it. As an example, I need to create a page where users can upload images. I'm planning to have an ImagesController with an upload action method, but I want that only accessible to logged in users. I suppose that in every restricted action I could add code to redirect if there's no current_user, but that seems really verbose. Is there a better way of doing this that allows me to define or identify restricted areas and handle the authentication check in one place?

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• Casting objects in C# (ASP.Net MVC)

  - by Mortanis

  I'm coming from a background in ColdFusion, and finally moving onto something modern, so please bear with me. I'm running into a problem casting objects. I have two database tables that I'm using as Models - Residential and Commercial. Both of them share the majority of their fields, though each has a few unique fields. I've created another class as a container that contains the sum of all property fields. Query the Residential and Commercial, stuff it into my container, cunningly called Property. This works fine. However, I'm having problems aliasing the fields from Residential/Commercial onto Property. It's quite easy to create a method for each property: fillPropertyByResidential(Residential source) and fillPropertyByCommercial(Commercial source), and alias the variables. That also works fine, but quite obviously will copy a bunch of code - all those fields that are shared between the two main Models. So, I'd like a generic fillPropertyBySource() that takes the object, and detects if it's Residential or Commercial, fills the particular fields of each respective type, then do all the fields in common. Except, I gather in C# that variables created inside an If are only in the scope of the if, so I'm not sure how to do this. public property fillPropertyBySource(object source) { property prop = new property(); if (source is Residential) { Residential o = (Residential)source; //Fill Residential only fields } else if (source is Commercial) { Commercial o = (Commercial)source; //Fill Commercial only fields } //Fill fields shared by both prop.price = (int)o.price; prop.bathrooms = (float)o.bathrooms; return prop; } "o" being a Commercial or Residential only exists within the scope of the if. How do I detect the original type of the source object and take action? Bear with me - the shift from ColdFusion into a modern language is pretty..... difficult. More so since I'm used to procedural code and MVC is a massive paradigm shift. Edit: I should include the error: The name 'o' does not exist in the current context For the aliases of price and bathrooms in the shared area.

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• How to document object-oriented MATLAB code?

  - by jjkparker

  I'm writing a sizable application using object-oriented MATLAB, and this has gotten me thinking about how to document the code. If this was C, I would use Doxygen. For Java, I'd use JavaDoc. Both have mostly agreed-upon standards for how class and method documentation should look and what it should contain. But what about MATLAB code? The most I've seen in TMW's own classes is a short sentence or two at the top of the class, and I can't find any topics devoted to documenting sizable MATLAB applications. So how do you document your MATLAB classes? Any particular style issues or additional tools?

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