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• How to serialize a collection of base type and see the concrete types in easy to read XML

  - by Jason Coyne

  I have a List which is populated with objects of various concrete types which subclass BaseType I am using the WCF DataContractSerializer <Children> <BaseType xmlns:d3p1="http://schemas.datacontract.org/2004/07/Tasks" i:type="d3p1:ConcreteTypeA"></BaseType> <BaseType xmlns:d3p1="http://schemas.datacontract.org/2004/07/Tasks" i:type="d3p1:ConcreteTypeB"></BaseType> </Children> Is there any way to get this to generate <Children> <ConcreteTypeA/> <ConcreteTypeB/> </Children> ? The real goal is to let users generate some XML to load into memory, and the users are of a skill level that asking them for the original XML is not going to be successful.

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• Is it possible for competing file access to cause deadlock in Java?

  - by BlairHippo

  I'm chasing a production bug that's intermittent enough to be a real bastich to diagnose properly but frequent enough to be a legitimate nuisance for our customers. While I'm waiting for it to happen again on a machine set to spam the logfile with trace output, I'm trying to come up with a theory on what it could be. Is there any way for competing file read/writes to create what amounts to a deadlock condition? For instance, let's say I have Thread A that occasionally writes to config.xml, and Thread B that occasionally reads from it. Is there a set of circumstances that would cause Thread B to prevent Thread A from proceeding? My thanks in advance to anybody who helps with this theoretical fishing expedition. Edit: To answer Pyrolistical's questions: the code isn't using Filelock, and is running on a WinXP machine.

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• WPF databinding update comboxbox2 based on selection change in combobox1 with MVVM

  - by cody

  I have a combo box that I have bound to a list that exists in my viewmodel. Now when a users makes a selection in that combo box I want a second combo box to update its content. So, for example, combobox1 is States and combobox2 should contain only the Zipcodes of that state. But in my case I don't have a predefined lists before hand for combobox2, I need to go fetch from a db. Also, if needed, I could get all the potential values for combobox2 (for each combobox1 value) before hand, but I'd like to avoiding that if I can. How do I implement in WPF and using MVVM? I'm fairly new to this whole wpf\databinding\mvvm world.

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• Using comet with PHP?

  - by ryeguy

  I was thinking of implementing real time chat using a PHP backend, but I ran across this comment on a site discussing comet: My understanding is that PHP is a terrible language for Comet, because Comet requires you to keep a persistent connection open to each browser client. Using mod_php this means tying up an Apache child full-time for each client which doesn’t scale at all. The people I know doing Comet stuff are mostly using Twisted Python which is designed to handle hundreds or thousands of simultaneous connections. Is this true? Or is it something that can be configured around?

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• Coding in Other (Spoken) Languages

  - by contagious

  Something i've always wondered, and I can't find any mention of it anywhere online. When a shop from, say Japan, writes code, would I be able to read it in english? Or do languages, like C, php, anything, have Japanese translations that they write? I guess what i'm asking is does every single coder in the world know enough english to use the exact same reserved words I do? Would this code: If (i < size){ switch case 1: print "hi there" default: print "no, thank you" } else { print "yes, thank you" } display the exact same as I'm seeing it right now in english, or would some other non-english-speaking person see the words "if", "switch", "case", "default", "print", and "else" in their native language? EDIT - yes, this is serious. I didn't know if different localiztions of a language have different keywords. or if there are even different localizations at all.

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• Python hooks navigation logger windows

  - by user363054

  Hi, I´m trying to do a path logger (Navigation logger) in Python, the thing that I need is that the program can get the paths that de user is accesing in real time, for example: C:\Documents and Settings\ C:\Documents and Settings\Administrator\ C:\Documents and Settings\Administrator\Desktop\ C:\Documents and Settings\Administrator\Desktop\archivos\ C:\Documents and Settings\Administrator\Desktop\Freescale ZeD 1.1.0.lnk C:\Documents and Settings\Administrator\Desktop\Freescale BeeKit.lnk C:\Documents and Settings\All Users\Desktop\PowerISO.lnk Someone knows how I can do this? I read and used the library pyhook, because I think that I need hooks, specially the WH_GETMESSAGE but pyhook doesn't use it and doesn't give the path only things like the Message, the time, the name of the window, etc. Note: I´m using Windows XP 32bits and python 2.6 Thanks in advance!

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• Common MVC 2 Pitfalls

  - by mcass20

  I surprised this hasn't been asked before...or maybe I just don't see it. Anyway, I'm finally straying from the comfort of ASP.NET Web Forms and exploring the world of MVC2. I've done the nerdinner walk-through and it was fairly straightforward. Now I am getting a little more adventurous and building an MVC2 app on my own and would like to know if there are some common pitfalls that others can attest to. Please consider my background as an ASP.NET Web Forms developer. Thanks!

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• Virtual network interface in Mac OS X

  - by Hans Doggen

  I know that you can make a virtual network interface in Windows (see here), and in Linux it is also pretty easy with ip-aliases, but does something similar exist for Mac OS X? I've been looking for loopback adapters, virtual interfaces and couldn't find a good solution. You can create a new interface in the networking panel, based on an existing interface, but it will not act as a real fully functional interface (if the original interface is inactive, then the derived one is also inactive). This scenario is needed when working in a completely disconnected situation. Even then, it makes sense to have networking capabilities when running servers in a VMWare installation. Those virtual machines can be reached by their IP address, but not by their DNS name, even if I run a DNS server in one of those virtual machines. By configuring an interface to use the virtual DNS server, I thought I could test some DNS scenario's. Unfortunately, no interface is resolving DNS names if none of them are inactive...

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• IP address detection for geo-location or MAC address much secure?

  - by SuperRomia

  Recent study many websites are using geo-location technology on their Websites. I'm planning to implement one website which can be detect the web visitor more accurate. An found that Mozilla is using some kind of detect MAC address technology in their Geo-Location web service. Is it violate some privacy issue? I believe most of Geo-location service providers only offer country to city level. But the Mac address detection enable to locate the web visitors' location more correctly than using IP address detection. If detect the MAC address is not practical, which geo-location service provider is offering more accurate data to detect my Website visitor around the world?

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• jQuery not replacing text in ReportViewer

  - by firedrawndagger

  I'm trying to replace text that I got back in the ReportViewer using jQuery. My div, wrapped in the table cell, display "empty" as text - which I plan on replacing with my own formatted text on the client side. I can use jQuery just fine to set a class on the div (which is inside a td element). Example: jQuery('div:contains("empty")').addClass('replacetext'); But for some reason I cannot do this: jQuery('div:contains("empty")').replaceWith('<div>Hello World</div>'); I tried this out on some other elements on the page and jQuery does work... but it seems like this issue is ReportViewer (I'm using 2008) specific.

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• Delphi's OTA: is there a way to get active configuration while building (D2010)?

  - by Alexander

  I can ask Delphi to build all configurations at once - by clicking on "Build configurations" and invoking "Make" command: This will build all configurations, one after another. The problem is that we have an IDE expert, which must react on compilation events. We register IOTAIDENotifier80 to hook events. There are BeforeBuild and AfterBuild events - we're interested in those. IOTAProject is passed to each event. The problem is: the active configuration is never changed. I.e. if you have "Debug" configuration selected (maked in bold) - all calls to BeforeBuild/AfterBuild events will return debug configuration profile (even though IDE compiles different profiles one after another). I mean properties of IOTAProject here. I also tried to use IOTAProjectOptionsConfigurations, but its ActiveConfiguration property always return the same "bolded" profile, regardless of current compiled one. The question is: is there a way to get the "real" current profile?

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• How to effectively measure developer's work hours?

  - by twk

  I have a few software developers working for my projects and I would like to provide them a way to register time they spent on real development. There is good will to register development hours, no force, but we try to avoid techniques like excel sheets register because this is so uncomfortable. I can track svn commits, but this is unreliable. Developers also helps supporting different projects during the day, so assuming they work on one project by whole day is not true. I've seen utilities that popups a message every hour to confirm the project you're working on but this is annoying. Some kind of active-window-title-anaylzer might help (you can get solution name from there in the case of Visual Studio) but I have no experience with such idea. If you have any experience with programmers/designers work hours registration, please share with me. Thanks

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• Java Date Hibernate cut off time

  - by Vlad

  Hi folks, I have a Date type column in Oracle DB and it contains date and time for sure. But when I'm trying to get data in java application it will return date with bunch of zeros instead of real time. In code it'll be like: SQLQuery sqlQuery = session.createSQLQuery("SELECT table.id, table.date FROM table"); List<Object[]> resultArray = sqlQuery.list(); Date date = (Date)resultArray[1]; If it was 26-feb-2010 17:59:16 in DB I'll get 26-feb-2010 00:00:00 How to get it with time?

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• Acquiring Table Lock in Database - Interview Question

  - by harigm

  One of my interview Questions, if multiple users across the world are accessing the application, in which it uses a Table which has a Primary Key as Auto Increment Field. The Question how can you prevent the other user getting the Same Primary key when the other user is executing? My answer was I will obtain the Lock on the table and I will make the user to wait Until that user is released with the Primary key. But the Question How do you acquire the Table lock programmatically and implement this? If there are 1000 users coming every minute to the application, if you explicity hold the lock on the table, then the application will become slower? How do you manage this? Please suggest the possible answers for the above question

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• php warning mysql_fetch_assoc

  - by death the kid

  I am trying to access some information from mysql, but am getting the warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource for the second line of code below, any help would be much appreciated. $musicfiles=getmusicfiles($records['m_id']); $mus=mysql_fetch_assoc($musicfiles); for($j=0;$j<2;$j++) { if(file_exists($mus['musicpath'])) { echo '<a href="'.$mus['musicpath'].'">'.$mus['musicname'].'</a>'; } else { echo 'Hello world'; } } function getmusicfiles($m_id) { $music="select * from music WHERE itemid=".$s_id; $result=getQuery($music,$l); return $result; }

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• Storing source files outside project file directory in Visual Studio C++ 2009

  - by Skurmedel

  Visual Studio projects assumes all files belonging to the project are situated in the same directory as the project file, or one underneath it. For a particular project (in the non-Visual Studio sense) this is not what I want. I want to store the MSVC-specific files in another folder, because there might be other ways to build the application as well, for example with SCons. Also all the stuff MSVC splurts out clutters the source directory. Example: /source /scons /msvc <- here is where I want my MSVC-specific stuff I can add the files, in Explorer, to the source directory manually, and then link them in Visual Studio with the project. It's not the end of the world, but it annoys me a bit that Visual Studio tries to dictate the folder structure of my project. I was looking through the schemas for the project files but realized that this annoying assumption is in the IDE and not the format of the project files. Do someone know a neater way to solve this than manually linking files to the project from the source directory?

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• Asp.Net MVC style routing in Django

  - by Andrew Hanson

  I've been programming in Asp.Net MVC for quite some time now and to expand a little bit beyond the .Net world I've recently began learning Python and Django. I am enjoying Django but one thing I am missing from Asp.Net MVC is the automatic routing from my urls to my controller actions. In Asp.Net MVC I can build much of my application using this single default route: routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = "" } // Parameter defaults ); In Django I've found myself adding an entry to urls.py for each view that I want to expose which leads to a lot more url patterns than I've become used to in Asp.Net MVC. Is there a way to create a single url pattern in Django that will handle "[Application]/view/[params]" in a way similar to Asp.Net MVC? Perhaps at the main web site level?

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• Experiences with "language converters"?

  - by Friedrich

  I have read a few articles mentioning converters from one language to another. I'm a bit more than skeptical about the use of such kind of tools. Does anyone know or have experiences let's say about Visual Basic to Java or vs converters? Just one example to pick http://www.tvobjects.com/products/products.html, claims to be the "world leader" or so in that aspect, However if read this: http://dev.mysql.com/tech-resources/articles/active-grid.html There the author states: "The consensus of MySQL users is that automated conversion tools for MS Access do not work. For example, tools that translate existing Access applications to Java often result in 80% complete solutions where finishing the last 20% of the work takes longer than starting from scratch." Well we know we need 80% of the time to implement the first 80% functionality and another 80% of the time for the other 20 %.... So has anyone tried such tools and found them to be worthwhile?

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• How can something like BOSH be implemented using Java Servlets

  - by John

  BOSH (Bidirectional-streams Over Synchronous HTTP) is a sneaky way of implementing 2-way client-server communication in situations where true server-push is not allowed, most obviously to let a server push data to a browser client without having to use client polling. It works by the client sending a request to the server, and the server doesn't respond immediately... rather it remembers the request but only responds when it has some data to send. When this happens the client immediately sends another request so there is virtually always a 'stored request' sitting on the server ready to push data to the client. At least, that's how I think it works! My question is how you can do this using a Java EE stack i.e standard servlets. I'm rusty with them, is it allowed to send no response and cache the request somehow? If anyone could share (pseudo) code what a servlet class for handling BOSH might look like, I'd be real grateful.

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• Django Custom Template Tages: Inclusion Tags

  - by Harry

  Hello world! Im trieng to build my own template tags Im have no idea why I get the errors I get, im following the django doc's. this is my file structure of my app: pollquiz/ __init__.py show_pollquiz.html showpollquiz.py This is showpollquiz.py: from django import template from pollquiz.models import PollQuiz, Choice register = template.Library() @register.inclusion_tag('show_pollquiz.html') def show_poll(): poll = Choice.objects.all() return { 'poll' : poll } html file: <ul> {% for poll in poll <li>{{ poll.pollquiz }}</li> {% endfor </ul> in my base.html file im am including like this {% load showpollquiz %} and {% poll_quiz %} Bu then I get the the error: Exception Value: Caught an exception while rendering: show_pollquiz.html I have no idea why this happens. Any ideas? Please keep in mind Im still new to Django

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• Update DataBase on clicking in button, after editing gridview (not automatically saving in DB, but a

  - by gaponte69

  0 vote down star I am using GridView in asp .net and editing data with edit command field property (as we know after updating the edited row, we automatically update the database), and I want to use transactions (with begin to commit statement - including rollback) to commit this update query in database, after clicking in some button (after some events for example), not automatically to insert or update the edited data from grid directly to the DB...so I want to save them somewhere temporary (even many edited rows - not just one row) and then to confirm the transaction - to update the real tables in database... Any suggestions are welcomed... I've used some good links, but very helpful, like: http://www.asp.net/learn/data-access/tutorial-63-cs.aspx http://www.asp.net/learn/data-access/tutorial-66-cs.aspx etc... etc...

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• How do I store keys pressed

  - by Glycerine

  I would like to store keys pressed when I listen out for the keyDown on the stage. I can add the listener fine, but I'm not getting the character I want out of the event to store it into a string. This is what I have so far: private var _addToString:String = ""; public function Hotwire() { this.addEventListener(KeyboardEvent.KEY_DOWN, keydownEventHandler); } private function keydownEventHandler(ev:KeyboardEvent):void { trace("Key pressed: " + ev.charCode ); addToString(ev.charCode); } private function addToString(value:uint):String { trace(_addToString); return _addToString += String.fromCharCode(value); } Every key I press its returns '0'. How do I convert the chatCode to a real alphanumeric character I can read later? Thanks in advance

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• String to date (Invalid format)

  - by MrThys

  I am using Joda Time library to convert my String dates to a real date, because this seemed like the easiest solution to do this. I am using the DateTime object to do this; new DateTime(strValue); But when inserting some formats it throws me the exception; java.lang.IllegalArgumentException: Invalid format: "Mon, 30 Sep 2002 01:56:02 GMT" java.lang.IllegalArgumentException: Invalid format: "Sun, 29 Sep 2002 19:59:01 GMT" java.lang.IllegalArgumentException: Invalid format: "Mon, 30 Sep 2002 01:52:02 GMT" java.lang.IllegalArgumentException: Invalid format: "Sun, 29 Sep 2002 17:05:20 GMT" java.lang.IllegalArgumentException: Invalid format: "Sun, 29 Sep 2002 19:09:28 GMT" java.lang.IllegalArgumentException: Invalid format: "Sun, 29 Sep 2002 15:01:02 GMT" java.lang.IllegalArgumentException: Invalid format: "Sun, 29 Sep 2002 23:48:33 GMT" java.lang.IllegalArgumentException: Invalid format: "Sun, 29 Sep 2002 17:24:20 GMT" java.lang.IllegalArgumentException: Invalid format: "Sun, 29 Sep 2002 11:13:10 GMT" Is there a way to solve this, or should I use something else instead of DateTime.

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• Is there a Java equivalent to libevent?

  - by JoelPM

  I've written a high-throughput server that handles each request in its own thread. For requests coming in it is occasionally necessary to do RPCs to one or more back-ends. These back-end RPCs are handled by a separate queue and thread-pool, which provides some bounding on the number of threads created and the maximum number of connections to the back-end (it does some caching to reuse clients and save the overhead of constantly creating connections). Having done all this, though, I'm beginning to think an event-based architecture would be more efficient. In searching around I haven't found any equivalents to libevent for Java, but maybe I'm not looking in the right place? Mina-statemachine from Apache was the closest thing I found, but it looks more verbose than I need and there's no real release available. Any suggestions?

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• iPhone Options for reading item from XML?

  - by fuzzygoat

  I am accessing this data from a web server using NSURL, what I am trying to decide is should I read this as XML or should I just use NSScanner and rip out the [data] bit I need. I have looked around the web for examples of extracting fields from XML on the iPhone but it all seems a bit overkill for what I need. Can anyone make any suggestions or point me in the right direction. In an ideal world I would really like to just specify [data] and get a string back "2046 3433 5674 3422 4456 8990 1200 5284" <!DOCTYPE tubinerotationdata> <turbine version="1.0"> <status version="1.0" result="200">OK</status> <data version="1.0"> 2046 3433 5674 3422 4456 8990 1200 5284 </data> </turbine> any comments / ideas are much appreciated. gary

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