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• When are you truly forced to use UUID as part of the design?

  - by Pyrolistical

  I don't really see the point of UUID. I know the probability of a collision is effectively nil, but effectively nil is not even close to impossible. Can somebody give an example where you have no choice but to use UUID? From all the uses I've seen, I can see an alternative design without UUID. Sure the design might be slightly more complicated, but at least it doesn't have a non-zero probability of failure. UUID smells like global variables to me. There are many ways global variables make for simpler design, but its just lazy design.

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• Explain ML type inference to a C++ programmer

  - by Tsubasa Gomamoto

  How does ML perform the type inference in the following function definition: let add a b = a + b Is it like C++ templates where no type-checking is performed until the point of template instantiation after which if the type supports the necessary operations, the function works or else a compilation error is thrown ? i.e. for example, the following function template template <typename NumType> NumType add(NumType a, NumType b) { return a + b; } will work for add<int>(23, 11); but won't work for add<ostream>(cout, fout); Is what I am guessing is correct or ML type inference works differently? PS: Sorry for my poor English; it's not my native language.

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• .Net Logger (Write your own vs log4net/enterprise logger/nlog etc.)

  - by Jack

  I work for an IT department with about 50+ developers. It used to be about 100+ developers but was cut because of the recession. When our department was bigger there was an ambitious effort made to set up a special architecture group. One thing this group decided to do was create our own internal logger. They thought it was such a simple task that we could spend recources and do it ourselves. Now we are having issues with performance and difficulty viewing the logs generated and some employees are frustrated that we are spending recources on infrastructure stuff like this instead of focusing on serving our business and using stuff that already exists like log4net or Enterprise Logger. Can you assist me in listing up reasons why you should not create your own .net logger. Also reasons for why you should are welcome to get a fair point of view :)

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• Prototype mouseleave for two connected elements

  - by TenJack

  I have created a small navigation element that is positioned right on top of another element. It is only shown when a user mousenters/mouseovers the main element. I am having some trouble with the prototype. I would like this small nav element to be hidden when a user mouses out of the main box, but I would also like the small nav element to remain visible if a user mouses out of the main box but mouses into the small nav at the same time. This is my attempt so far with some pseudo-code to hopefully explain: $('main_box').observe('mouseenter', function(){ $('small_div').show() }) $('main_box').observe('mouseleave', function(){ if this element is $('small_div') then Event.stop() $('small_div').observe('mouseleave', function(){ if this element is $('main_box') Event.stop observe $('main_box') mouseleave else $('small_div').hide(); }) else $('small_div').hide(); }) The main thing I'm having trouble with is figuring out what element the mouse is over at a given point in time. Is there a way to do something like: on mouseleave do blah unless the mouse is over a specific element then do not do blah?

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• Changing the URL of an ExpressionEngine forum

  - by Steph

  I've set up a forum on ExpressionEngine and customised the URL as I want a specific path to the forum. To do this I went to Modules Discussion Forum Forum Board Preferences and in the Forum URL put in my desired URL. Let's call it http://www.mywebsite.com/students/forum/ My homepage displays the latest 5 posts from the forum. It all works except for the URLs which don't go to this URL and instead point to http://www.mywebsite.com/forums/viewthread/xxx Is there an extra step I am missing here? Why doesn't the forum URL just update automatically when I save it?

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• Animate the enabling of a UIBarButtonItem?

  - by Michael Brewer

  Is there a way to animate enabling or disabling a button? I've tried the following with no success. I'm guessing at this point that the enabled property cannot be animated like opacity can – but I hope I'm wrong. [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:1.0f]; theButton.enabled = YES; [UIView setAnimationDelegate:self]; [UIView commitAnimations]; I can't believe there isn't a setEnabled:(BOOL)enabled animated:(BOOL)animated method.

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• Matlab code help. Backward Euler method.

  - by m0s

  Here is the matlab/freemat code I got to solve ODE numerically using backward Euler method. However the results are inconsistent with my textbook results, and sometimes even ridiculously inconsistent. Please point out what is wrong with the code. I have already asked this question on mathoverflow.com no help there, hope someone here can help. function [x,y]=backEuler(f,xinit,yinit,xfinal,h) %f - this is your y prime %xinit - initial X %yinit - initial Y %xfinal - final X %h - step size n=(xfinal-xinit)/h; %Calculate steps %Inititialize arrays... %1st elements take xinit and yinit corespondigly, the rest fill with 0s x=[xinit zeros(1,n)]; y=[yinit zeros(1,n)]; %Numeric routine for i=1:n x(i+1)=x(i)+h; ynew=y(i)+h*(f(x(i),y(i))); y(i+1)=y(i)+h*f(x(i+1),ynew); end end

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• Commutative (operational transform) diffs for databases

  - by barrycarter

  What Unix program generates "diff"s between text files (or INSERT/UPDATE/DELETEs for databases) in such a way that the order that the "diff"s are applied in is irrelevant, and the result is the same regardless of order. Etherpad used to do something like this. Example (for a given document or database): % Adam makes a change X, then Bob makes a change Y, then Adam makes another change Z. % However, because of network latency, Adam sees the changes in this order: XZY, while Bob sees them in this order: YXZ. % However, the code/changes are written so that XYZ and YXZ yield the same result. Note: ideally, this can be done without having to do X/Y/Z inverse at any point. I have read http://stackoverflow.com/questions/2043165/operational-transformation-library but I'm not sure this really does what I want.

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• Steps in subclassing UINavigationController

  - by RickiG

  Hello I would like to subclass the UINavigationController to get some more freedom in regards to the appearance of the controller. I have some graphics for the different parts, bars, buttons, text etc. Looking at the UINavigationController header file I get little help, I don't know where to start out. I have never subclassed/overridden a UIKit component before, it seems it is a bit like playing Sherlock Holmes. What is the approach? How do I know what to override to get a a specific piece of graphics "injected" the correct place? Do I need to subclass UINavigationBar, UIBarButtonItem etc. etc to get the complete customized look? How do I know if something is off limits in regards to being approved by Apple? Hope someone can point me in the right direction, I have only been able to find examples of changing small parts of the controller, not a full customization by subclassing. Am I going about this the wrong way? Thanks:)

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• How to deal with databases for websites written in Java, more specifically Wicket?

  - by John

  Hi there. I'm new to website development using Java but I've got started with Wicket and make a little website. I'd like to expand on what I've already made (a website with a form, labels and links) and implement database connectivity. I've looked at a couple of examples, in example Mystic Paste, and I see that they're using Hibernate and Spring. I've never touched Hibernate or Spring before and to be honest the heavy use of annotations scare me a little bit as I haven't really made use of them before, with the exception of supressing warnings and overriding. At this point I have one Connection object which I set up in the WebApplication class upon initialization. I then retrieve this connection object whenever I need to perform queries. I don't know if this is a bad approach or not for a production web application. All help is greatly appreciated.

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• Overriding Home button for a Car Home replacement app

  - by BigFwoosh

  I have been working on a replacement for the stock Car Home app for a bit, and I am completely stumped on how to override the Home button so that my app will be brought back to the foreground whenever the phone is docked. This is the way that Car Home works, so there must be a way. It seems that BroadcastReceivers won't work, because the intent that is broadcast whenever the Home button is pressed will still cause the default homescreen app to launch; I cannot prevent it. I can override the Home button from within my app, but that does me no good since this needs to work when the user is outside my app. Car Home also does not do anything weird like set itself as the default homescreen app while it's running (I checked the logcat to make sure). I've been really beating my head against the wall on this. Does anyone have any ideas, or can you at least point me in the right direction?

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• C# Monitor Programs Periodically Based on PID

  - by ThaKidd

  Thank you in advance for you ideas and input. I would like to periodically check to see if a third party program is currently running on a user's system from my program. I am currently launching the program as follows in C#: String plinkConString = ""; // my connection string Process plink = Process.Start(utilityPath + @"\putty.exe", plinkConString); int plinkProcessId = plink.Id; I launch the program and grab its pid in a Windows environment. As Putty/PLink may disconnect from its SSH server at some point and close, what is the best way to monitor how this process is doing in code? Is there a better way to launch this program to monitor its success or failure?

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• jQuery remove selected option from this

  - by odavy

  Hi all, first post here, I come in peace :) I've searched but can't quite find what I'm after. I am trying to manipulate the selected option of a select box. Can someone please explain why this works: $('#some_select_box').click(function() { $('#some_select_box option:selected').remove(); }); but this doesn't: $('#some_select_box').click(function() { $('this option:selected').remove(); }); I just want to use "this" instead of spelling out the id of the select box - can someone point me in the right direction for the correct syntax? It's driving me mad because it looks like it should be really simple. And I'm sure it is to someone, but not me, cos its the end of the day and I'm brain-fried... Any pointers much appreciated. Cheers

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• Using SalesForce's Web Service to create and set the type of a Task

  - by Alan Williamson

  I am successfully creating a Task using the SalesForce API SOAP API through Java. However, my problem is that I can't seem to set the Type of it. They all default to "Call" but I really want them to be "Email". Can someone point me in the direction of where I can do this? I think it is to do with RecordTypeMapping, but i am somewhat confused as to how to use this in my Java code to look up the particular one for Task type. I feel I have got so close with this. I have the correct WSDL that is giving me the extra method on the Task.java class, but no matter what I pass in, it dies. This doesn't seem to be a huge ask, yet i am perplexed as to which dots to join to get it to work Any help would be appreciated. thanks

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• Python: avoiding fraction simplification

  - by Anthony Labarre

  Hi all, I'm working on a music app' in Python and would like to use the fractions module to handle time signatures amongst other things. My problem is that fractions get simplified, i.e.: >>> from fractions import Fraction >>> x = Fraction(4, 4) >>> x Fraction(1, 1) However, it is important from a musical point of view that 4/4 stays 4/4 even though it equals 1. Is there any built-in way to avoid that behaviour? Thanks!

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• Identifying CDs

  - by Chris

  I'd like to be able to determine what music album CD is in a CD drive. For example, if someone claims that the CD in their drive is Eminem - The Eminem Show, I would like to be able to verify that the CD is indeed The Eminem Show. Any ideas? I've applied for a Gracenote developer license, but they won't get back to me for five days. Also, how does this work? Is there some GUID or other unique identifier that music discs are encoded with? Lastly, might this be possible with data CDs, like, say, the Diablo II install Disc 1? If so, any directions you can point me in, for accomplishing this?

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• Is there a way to put Setter elements inside EventTrigger?

  - by Dennis Delimarsky

  Working on a WPF application, I started working on a custom ControlTemplate. I reached the point where I need to change some control properties when an event occurs. For this purpose, there are Setter elements. Seems all good, but I cannot use them inside EventTrigger elements. For example, if a simple Trigger, that can be bound to control properties, is used then Setter elements can be used inside. However, I do not want to bind to a property change but rather to an event. Is there a way to do this in pure XAML or will I have to work in the code-behind?

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• How to define a varying length of the string in XSD pattern?

  - by infant programmer

  The input XML tag must be validated for a pattern which is like this: type : positive int / decimal, minimum length is 0, max length is 12(before decimal point), fraction digits are optional if exist then precision must be 2. This means both positive integer and Decimal numbers(2 digit precision) are allowed. so the acceptable values can be like, null, 0, 0.00, 1234567890, 123456789012, 123456789012.12, invalid values are: 0.000, 1234567890123(13 digits - invalid), The pattern I have designed is: <xs:pattern value="|([0-9]){12}|([0-9]){12}[.][0-9][0-9]"/> The problem with this pattern is, it doesn't allow the number with string-length less than 12, it says "1234567890" is an invalid value, where as it must be allowed!

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• Accessing NHibernate Repository using ASP.NET Ajax WebMethod

  - by LooDaFunk

  Hi there! on my page I have a save button that gets the values from the form and then saves it in the database using NHibernate. This works using ASP.net postback buttons. I have now added an Ajax WebMethod to make things sleek and quicker. Howver, when trying to access the data in the repository it doesn't seem to get it. I am passing in the correct values, and everything looks the same as when you are using the postback but no Joy! I should point out here that I'm a newbie with NHibernate and I'm working with someone elses code. Here's the code: the main problem is this line: Solution.Entities.Hierarchy.Tag tag = tagRep.Get(tagId); The tagID is fine, but when it does the get no exception is raised it just comes out the method and goes back to the page???? http://pastebin.com/cBTp9pnC Anyone have any ideas? Merry Christmas!

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• Application leaking Strings?

  - by Jörg B.

  My .net application does some heavy string loading/manipulation and unfortunately the memory consumption keeps rising and rising and when looking at it with a profiler I see alot of unreleased string instances. Now at one point of time or another I do need all objects t hat do have these string fields, but once done, I could get rid of e.g. the half of it and I Dispose() and set the instances to null, but the Garbage Collector does not to pick that up.. they remain in memory (even after half an hour after disposing etc). Now how do I get properly rid of unneeded strings/object instances in order to release them? They are nowhere referenced anymore (afaik) but e.g. aspose's memory profiler says their distance to the gc's root is '3'?

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• BackgroundWorker RunWorkerCompleted in a Component

  - by Sphynx

  I'm familiar with the following: "If the operation raises an exception that your code does not handle, the BackgroundWorker catches the exception and passes it into the RunWorkerCompleted event handler, where it is exposed as the Error property of System.ComponentModel.RunWorkerCompletedEventArgs. If you are running under the Visual Studio debugger, the debugger will break at the point in the DoWork event handler where the unhandled exception was raised." However, I've encountered a weird glitch. In my component, there's an instance of BackgroundWorker. Even though it's not running in the debugger, the exception remains unhandled by the worker. Even simplified code produces an unhandled exception (and RunWorkerCompleted doesn't fire): Throw New ArgumentException("Test") The main thing is the code of RunWorkerComplete: RaiseEvent UpdateComplete(Me, New AsyncCompletedEventArgs(e.Error, e.Cancelled, e.Result)) I need the component to expose the worker exception through a public event. If I remove the RaiseEvent call, the exception becomes handled by the worker, and accessible through e.Error. Apparently, raising an event causes the worker to miss the exception. How can that be?

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• How do I launch a subprocess in C# with an argv? (Or convert agrv to a legal arg string)

  - by lucas

  I have a C# command-line application that I need to run in windows and under mono in unix. At some point I want to launch a subprocess given a set of arbitrary paramaters passed in via the command line. For instance: Usage: mycommandline [-args] -- [arbitrary program] Unfortunately, System.Diagnostics.ProcessStartInfo only takes a string for args. This is a problem for commands such as: ./my_commandline myarg1 myarg2 -- grep "a b c" foo.txt In this case argv looks like : argv = {"my_commandline", "myarg1", "myarg2", "--", "grep", "a b c", "foo.txt"} Note that the quotes around "a b c" are stripped by the shell so if I simply concatenate the arguments in order to create the arg string for ProcessStartInfo I get: args = "my_commandline myarg1 myarg2 -- grep a b c foo.txt" Which is not what I want. Is there a simple way to either pass an argv to subprocess launch under C# OR to convert an arbitrary argv into a string which is legal for windows and linux shell? Any help would be greatly appreciated.

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• Active Record/ORM vs Normal Forms?

  - by Arsenal

  Hello, I've been playing around with Active Record a bit, and I have noticed that A.C./ORM always uses the following database model when creating a one-to-one relationship Person id | country_id | name | ... Country id | tld | name | ... No I wondered, isn't this a violiation of the third Normal Form? This clearly states "Every non-prime attribute is non-transitively dependent on every key of the table". Well this country_id isn't dependent of personid is it? So is this wrong or am I just not getting the point?

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• I want to query whitepages.com 4,000 times, how to save the results?

  - by John Corbin

  I have an old customer list of 4,000 businesses. I want to determine if the phone numbers associated with each listing are still working (and therefore the business is probably still open). I can put each number in whitepages.com and check them one by one... but want to automate the results. I have looked at their API and can't digest it. I can form the correct query URL, but trying things like cURL -O doesn't work. I have access to Mac tools, Unix tools, and could try various javascript stuff if anyone could point me in the right direction... would even pay. Help? Thx

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• Django 1.5 custom User model error. "Manager isn't available; User has been swapped"

  - by bpetit

  I extend the django user model as described in the dev doc. I wan't to keep most of the original User model features so I extend the AbstractUser class. I've defined in settings.py: AUTH_USER_MODEL = 'myapp.CustomUser' My user class: class CustomUser(AbstractUser): custom_field = models.ForeignKey('OtherModel') objects = UserManager() Everything seems to work fine but when I try to make it managed by the admin site: admin.site.register(CustomUser, UserAdmin) I get this error on the admin CustomUser creation page (after validation of the password confirmation form): AttributeError: Manager isn't available; User has been swapped for 'myapp.CustomUser' The point is that I need this model managed by the admin site in order to have the same creation process as with the original User model (two step process with password validation). Thanks for any reply

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