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• Tracking changes to individual fields - Silverlight

  - by Appu

  I have a page which has got several text boxes. These controls are bound to a model. I am using MVVM. Assume I have three text boxes, FirstName, LastName and Company. So in the model, I have three properties to bind. Now I need to track the changes happened to each field. If FirstName changes from original value, I need the text box to be colored with a different background color. Currently I am creating another property called FirstNameChanged and binding the background to this property. This will be updated when I change the FirstName. For 3 fields, this seems to be OK. But when I have more fields, the number of properties will be too much. Is there a better way to handle this?

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• How do I make a defaultdict safe for unexpecting clients?

  - by ~miki4242

  Several times (even several in a row) I've been bitten by the defaultdict bug. d = defaultdict(list) ... try: v = d["key"] except KeyError: print "Sorry, no dice!" For those who have been bitten too, the problem is evident: when d has no key 'key', the v = d["key"] magically creates an empty list and assigns it to both d["key"] and v instead of raising an exception. Which can be quite a pain to track down if d comes from some module whose details one doesn't remember very well. I'm looking for a way to take the sting out of this bug. For me, the best solution would be to somehow disable a defaultdict's magic before returning it to the client.

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• why my ProgressBar can't capture the mouse down event?

  - by donarlee

  I use a custom skin as the track skin, but i can't get the mouse down event protected function application1_creationCompleteHandler(event:FlexEvent):void { pBar.addEventListener(MouseEvent.MOUSE_DOWN, onEvent, true); } protected function onEvent(event:MouseEvent):void { trace("mouse down"); } ]]> </fx:Script> <s:layout> <s:VerticalLayout horizontalAlign="center" verticalAlign="middle" /> </s:layout> <mx:ProgressBar id="pBar" width="518" height="15" labelPlacement="center" trackSkin="skins.CustomTrackSkin" mode="manual" label="" minimum="0" maximum="100"/>

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• Error in configuration file

  - by OM The Eternity

  I have copied my project folder from my live server to my local host and edited the config file as per localhost, but still i am displayed with the "Internal Server Error:500" The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, admin@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. I cannot understand what should be the problem here, please help me to track the issue here....

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• ctrl-c does not copy text on a webpage

  - by aepheus

  I've come across this several times, ctrl-c randomly does not copy. I think it's caused by javascript or maybe some odd html syntax. I never spent the time to track down what caused it. Anyone know the typical/common causes of ctrl-c not working (to copy) on a website? Speaking from a developers standpoint. What do we developers end up doing to break ctrl-c? Just to clarify, I'm not interested in preventing copying. I'm trying to do the opposite, occasionally I find I've done something that is preventing ctrl-c from copying text, and that is not very user friendly on a text heavy site.

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• How do I find out which process is locking a file using .NET?

  - by AJ

  I've seen several of answers about using Handle or Process Monitor, but I would like to be able to find out in my own code (C#) which process is locking a file. I have a nasty feeling that I'm going to have to spelunk around in the win32 API, but if anyone has already done this and can put me on the right track, I'd really appreciate the help. Update Links to similar questions How does one figure out what process locked a file using c#? Command line tool Across a Network Locking a USB device Unit test fails with locked file deleting locked file

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• Do programmable Ethernet devices (think onboard CPU) really exist?

  - by PeterM

  I've heard from various people that programmable Ethernet cards exist and are easily available. However I have yet to be able to track down one of these mythical devices so I'm wondering if they're just that - a myth. Such a programmable card has a gigabit Ethernet interface, has a programmable CPU and connects to the host system via PCI Express. The problem area these cards address are low latency network applications where the card itself does the work and "reports back" to the operating system. Basically the card acts as a co-processor and handles all the low latency requirements on the card, thus avoiding the issues of writing low latency code in user-land - think 0.4ms - 0.5ms response times. So my question is, do these cards really exist and if so, where can I get my hands on one?

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• VB.NET Abstract Property

  - by ElPresidente

  I have an abstract "GridBase" class with two types of derived classes "DetailGrid" and "HeaderGrid". Respectively, one is comprised of "DetailRow" objects and the other "HeaderRow" objects. Both of those inherit from a "RowBase" abstract class. What I am trying to do is the following: Public MustInherit Class GridBase Private pRows As List(Of RowBase) Public ReadOnly Property Rows As List(Of RowBase) Get Return pRows End Get End Property End Class Public Class DetailGrid Inherits GridBase End Class In this scenario, I want DetailGrid.Rows to return a list of DetailRow. I want HeaderRow.Rows to return a list of HeaderRow. Am I on the right track with this or should the Rows property not be included in the GridBase class?

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• Visual Studio 2010 Macro - Reporting Progress

  - by user295841

  I have just discovered macros in Visual Studio and I can't be happier. Well... I have my complaints but... you know ;) A few of my macros are taking quite a while to complete and I am looking for a way to track progress. I build a log file during most of my macro processes but I have not found a good way to report progress without pausing the process. Ex. MsgBox("Progress") Any way to access the output window or even better the VS status bar?

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• Building a user subscription application

  - by Tristan O'Neil

  Hello, I'm trying to come up with the best way to handle user subscription and management for our magazine website. What I want to happen is a user purchases a subscription and they are granted online access of a certain membership role for a certain amount of time depending on how many years they subscribed for. I would also like the system to be able to send out emails when a subscription is almost up. I've seen some third party projects to help accomplish this but I'd prefer to write this from scratch as I want total control over how it works. Any suggestions would be helpful. The main thing I can't figure out is how to have an expiring membership. You must keep track of when the user signed up and how long until they should expire.

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• Simple C++ container class that is thread-safe for writing

  - by conradlee

  I am writing a multi-threaded program using OpenMP in C++. At one point my program forks into many threads, each of which need to add "jobs" to some container that keeps track of all added jobs. Each job can just be a pointer to some object. Basically, I just need the add pointers to some container from several threads at the same time. Is there a simple solution that performs well? After some googling, I found that STL containers are not thread-safe. Some stackoverflow threads address this question, but none that forms a consensus on a simple solution.

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• Specifying routes by subdomain in Express using vhost middleware

  - by user730569

  I'm using the vhost express/connect middleware and I'm a bit confused as to how it should be used. I want to have one set of routes apply to hosts with subdomains, and another set to apply for hosts without subdomains. In my app.js file, I have var app = express.createServer(); app.use...(middlware)... app.use(express.vhost('*.host', require('./domain_routing')("yes")); app.use(express.vhost('host', require('./domain_routing')("no")); app.use...(middlware)... app.listen(8000); and then in domain_routing.js: module.exports = function(subdomain){ var app = express.createServer(); require('./routes')(app, subdomain); return app; } and then in routes.js I plan to run sets of routes, dependent on the subdomain variable passed in is "yes" or "no". Am I on the right track or is this not how you use this middleware?

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• Deploy PHP website to client server without showing PHP files

  - by ColmF

  I asked a recent question regarding the use of readfile() for remotely executing PHP, but maybe I'd be better off setting out the problem to see if I'm thinking the wrong way about things, so here goes: I have a PHP website that requires users to login, includes lots of forms, database connections and makes use of $_SESSION variables to keep track of various things I have a potential client who would like to use the functionality of my website, but on their own server, controlled by them. They would probably want to restyle the website using content and CSS files local to their server, but that's a problem for later I don't want to show them my PHP code, since that's the value of what I'd be providing. I had thought to do this with calls to include() from the client's server to mine, which at least keeps variable scope intact, but many sites (and the PHP docs) seem to recommend readfile(), file_get_contents() or similar. Ideally I'd like to have a simple wrapper file on the client's server for each "real" one on my server. Any suggestions as to how I might accomplish what I need? Thanks, ColmF

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• Best way Implement "refferal links" in Django

  - by Murkin

  Intro I am working on an e-commerce website. And we want to add a feature where a user can refer others via a custom link e.g.: http://mysite.com/a1t2312 or http://mysite.com/?ref=a1t2312 (a1t231 being the referral code). A user following such a link, will navigate a few pages on the site. And if he reached the 'buy' page and purchases something - the original referrer will get a discount. The question is: What is the best method to track the referral code ? Put it in the user's cookies ? Stick it somehow into the session ? Other method ? Thanks

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• Are there any good materials or examples on creating a custom Designer in the Delphi IDE

  - by Mark Elder

  I am working on creating a custom form designer in the Delphi IDE. I'm trying to use the RegisterCustomModule, TBaseCustomModule, and ICustomModule functions, classes, and interfaces. My first question on this pointed me to the Delphi Developer's Handbook and the idea that I could even create a custom form designer. However, that book seems to be all Delphi 3 information and things have really changed since then. I'm not finding any material in the Delphi Help file, and searches have not returned very much. I did find the Accidental Programmer's page on the Open Tools, but that looks like it was last up dated in 1998? It does at least have the correct unit names and uses the new interfaces. I'm willing to track down and buy an older book if that is the best reference.

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• Multiple svn projects into one git repository?

  - by trondgzi

  Hi, I have started to use git-svn for some of my work to be able to do local commits. This works great for projects that use standard svn layout. Recently I started working on a Java project that is split into multiple connected modules (20-25), and each module have its own root folder in the same svn repo with its own trunk/branches/tags. svnrepo/ module-1 trunk branches tags module-N trunk branches tags I have cloned each and every module with git svn clone -s /path/to/svnrepo/module[1-N]. The "problem" is that when I want to do git svn rebase on all modules i have to do it N times. I have tried to do git svn clone /path/to/svnrepo/ do avoid doing the rebase operation N times, but that leaves me with a directory layout that is the same as in the svn repo. Is there a way that I can track all the trunks of all modules in one git repo? So that I get a directory layout like this within my git repository: module-1 module-2 module-N

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• For external links on my webpage, should I use a redirector page or just link direct to the external

  - by AaronM

  Hello, just wondering if I should be using a 'redirector' type page or link directly to the external pages on my site http://www.onedaysalefinder.co.nz/ - currently I use a redirector page to track what links are being clicked on (which simply takes an ID, looks up the URL in the database, and then does a Response.Redirect(URL); From a SEO point of view, is this a good idea/bad idea? I understand it can add a few milliseconds extra to the external page load time whilst it looks up the actual URL, but am not too concerned about this. I also get the benefit of tracking the clicks accurately, but are the pros/cons of using a redirector vs the actual link? Am I worrying about something I don't need to? Thanks

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• JAVA: How do I accept input during a certain period of time only

  - by sebrock

  Im trying to do a simple game where I continually need input from players. This needs to happen during a certain time period only. Everything that is sent after that will be discarded. After the time period a new game starts. So: Start game Wait for input from all players during 10 seconds 10 secs no more input Calculate the winner and do some stuff Goto 1. I was thinking using a timer and timertask to keep track of time and maybe use a boolean variable that changes from "open" to "closed" after 10 seconds? Please give me some advise on this.

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• Caching images with different query strings (S3 signed urls)

  - by Brendan Long

  I'm trying to figure out if I can get browsers to cache images with signed urls. What I want is to generate a new signed url for every request (same image, but with an updated signature), but have the browser not re-download it every time. So, assuming the cache-related headers are set correctly, and all of the URL is the same except for the query string, is there any way to make the browser cache it? The urls would look something like: http://example.s3.amazonaws.com/magic.jpg?WSAccessKeyId=stuff&Signature=stuff&Expires=1276297463 http://example.s3.amazonaws.com/magic.jpg?WSAccessKeyId=stuff&Signature=stuff&Expires=1276297500 We plan to set the e-tags to be an md5sum, so will it at least figure out it's the same image at that point? My other option is to keep track of when last gave out a url, then start giving out new ones slightly before the old ones expire, but I'd prefer not to deal with session info.

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• Polymorphic associations in Rails

  - by Newy

  Say I have two models, Apples and Oranges, and they are both associated with a description in a Text model. Text is a separate class as I'd like to keep track of the different revisions. Is the following correct? Is there a better way to do this? [Apple] has_one :text, :as => :targit, :order => 'id DESC' has_many :revisions, :class_name => 'Text', :as => :targit, :order => 'id', :dependent => :destroy [Text] belongs_to :targit, :polymorphic => true

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• Conditions of Use dialog for Windows logins

  - by 20th Century Boy

  I need to design a "Conditions of Use" dialog that is presented to users after they logon to Windows XP. It must not allow the user to proceed until they check an "I agree" box. It must not be possible to shut it using Task Manager or any other method. And it should be fullscreen and modal. The "I agree" will remain checked automatically during subsequent logins for the duration of 1 month, after which the user will need to check it again. Also HR want to track who has checked the checkbox. Is such a thing possible using .Net? I can use C# to design it but I'm not sure about how to prevent users from bypassing the dialog. I know Windows Group Policy allows a dialog to be presented before login, but that does not allow a checkbox or any customization. Any thoughts?

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• Where happens merging in SVN - on the client or server?

  - by Malcolm Frexner

  At my company we evaluate working with feature branches. We want to use mergeinfo to track merging. I have issues in some of our tested projects where merging a trunk that has only little changes into branch leads to lots of changed files because of the changed mergeinfo. I read that this behaviour improoved between version 1.5 and 1.6. Does this mean if I update the SVN - server from 1.5.6 to 1.6 I can expext some improvements when merging, or does this depend on the client (which is 1.6.11)?

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• Disabling click or mousedown event on jQuery UI Slider

  - by Sparda

  I am trying to disable the click or mousedown event on the Slider tract. I want the slider to only move by dragging the handle. I tried adding preventDefault() and return false to the slider but no use. Its still triggering the jump. Example: http://jsbin.com/iguruh/1/edit I know this is similar to this jQuery UI Slider - Disable click on slider track but the solutions provided there are not working because i have the range option set to false. Appreciate any help.

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• How do I make replies to comments? (PHP)

  - by jpjp

  I want to create something like reddit where they have comments, then replies to the comment, then reply to the reply. What type of database structure do they use so: 1. they keep track of all the comments to a posting 2. a reply to a comment 3. a reply to a reply All I have right are is just a posting and a bunch of comments relating to it like.. POSTING TABLE posting_id | title | author COMMENTS TABLE comment_id | posting_id | comment REPLIES TABLE ???? How do I relate the comments to the replies? What type of css do they use to give replies that indented space?

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• Stopwatch vs. using System.DateTime.Now for timing events

  - by Randy Minder

  I wanted to track the performance of a piece of my application so I initially stored the start time using System.DateTime.Now and the end time also using System.DateTime.Now. The difference between the two was how long my code took to execute. I noticed though that the difference didn't appear to be accurate. So I tried using a Stopwatch object. This turned out to be much, much more accurate. Can anyone tell me why Stopwatch would be more accurate than calculating the difference between a start and end time using System.DateTime.Now? Thanks.

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