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  • The fastest way to do a collection subtraction

    - by Tony
    I have two Sets. Set<B> b is the subset of Set<A> a. they're both very huge Sets. I want to subtract b from a , what's the best practice to do this common operation ? I've written to many codes like this , and I don't think it's efficient. what's your idea ? for(int i = 0 ; i < a.size(); i++) { for (int j=0 ; j < b.size() ;j++) { // do comparison , if found equals ,remove from a break; } } And I want to find an algorithm , not only applies to Sets, also works for Array.

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  • How does one decrypt a PDF with an owner password, but no user password?

    - by Tony Meyer
    Although the PDF specification is available from Adobe, it's not exactly the simplest document to read through. PDF allows documents to be encrypted so that either a user password and/or an owner password is required to do various things with the document (display, print, etc). A common use is to lock a PDF so that end users can read it without entering any password, but a password is required to do anything else. I'm trying to parse PDFs that are locked in this way (to get the same privileges as you would get opening them in any reader). Using an empty string as the user password doesn't work, but it seems (section 3.5.2 of the spec) that there has to be a user password to create the hash for the admin password. What I would like is either an explanation of how to do this, or any code that I can read (ideally Python, C, or C++, but anything readable will do) that does this so that I can understand what I'm meant to be doing. Standalone code, rather than reading through (e.g.) the gsview source, would be best.

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  • In terms of loss of volume or corruption, is failure probability of an Amazon EBS volume 'x', indepe

    - by Tony Morgan
    In terms of loss of volume or corruption, is failure probability of an Amazon EBS* volume 'x', independent of the failure of another volume 'y'. Amazon states[1] AFR** of between 0.1%-0.5%, lets say 0.5%, 0.005. To restate the question is the AFR composed of two EBSs mirrored actually 0.005*0.005 = 0.000025? To be clear I'm not interested in high availability here, just very high durability. *EBS = elastic block storage (amazons persistant disks) **AFR = annual failure rate. [1] http://aws.amazon.com/ebs/

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  • GenericIdentity not FormsIdentity

    - by Tony
    H Regarding this URL http://www.codeproject.com/KB/aspnet/FlashUpload.aspx User.Identity as System.Web.Security.FormsIdentity is always null, because the Identity is GenericIdentity, I assumed it will be as in the tutorial FormsIdentity, what is chances. Thanks

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  • ASP.NET MVC vs. WebForms - a simple question

    - by Tony
    Hi, I'm wondering about one thing - as we know, the MVC pattern is stateless (it doesn't use the ViewState, so we use only HTML controls), but if we use them in WebForms as well, it'll become stateless too ? so, by doing this, we are getting closer to the MVC pattern ?

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  • How do I check if a user is a fan of my facebook page on my website?

    - by Tony
    I want to check if my users are fans of my facebook page. I think something like this should do it: <script type="text/javascript" src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/en_US"></script> <script type="text/javascript">FB.init("my api key","xd_receiver.htm");</script> <script type="text/javascript"> //<![CDATA[ FB_RequireFeatures(["Api"], function(){ var api = FB.Facebook.apiClient; api.pages_isFan(PAGE_ID,gigyaUser.FACEBOOK_USER_ID,function(response){ alert(response); }); }); //]]> </script> However, for some reason I keep getting null even though the user is in fact a fan of the page. Am I missing something?

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  • A strange problem using jquery in IE6.

    - by Tony
    I am using jquery load method to update divs , it works great until I test my code under IE6. The problem is : under IE6 , when I click a button to trigger a load method , the page is remaining unchanged until I move my cursor, that means if I click my mouse and keep my hand away from the mouse , the page is unchanged , if I move the mouse , the page is updated. This problem is only occurred under IE6 . IE7 , IE8, Firefox all have no problem. Have you guys ever encountered this kind of problem ?

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  • Theory of computation - Using the pumping lemma for context free languages

    - by Tony
    I'm reviewing my notes for my course on theory of computation and I'm having trouble understanding how to complete a certain proof. Here is the question: A = {0^n 1^m 0^n | n>=1, m>=1} Prove that A is not regular. It's pretty obvious that the pumping lemma has to be used for this. So, we have |vy| = 1 |vxy| <= p (p being the pumping length, = 1) uv^ixy^iz exists in A for all i = 0 Trying to think of the correct string to choose seems a bit iffy for this. I was thinking 0^p 1^q 0^p, but I don't know if I can obscurely make a q, and since there is no bound on u, this could make things unruly.. So, how would one go about this?

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  • belongs_to with a custom class_name not producing proper foreign key in Rails 3

    - by Tony
    I am updating an application to Rails 3 and I am having trouble creating a custom foreign key. I have something like this: class Product < ActiveRecord::Base belongs_to :owner, :class_name => 'User' ... end class User < ActiveRecord::Base has_many :products ... end class ProductsController < ApplicationController before_filter :authenticate_user! def index @products = current_user.products end end The view: <%- @products.each do |p| -%> <%= p.created_at %><br /> <%- end -%> I get this error in my Rails log: Mysql::Error: Unknown column 'products.user_id' in 'where clause': SELECT `products`.* FROM `products` WHERE (`products`.user_id = 1) It should see the belongs_to :owner and look for a foreign key called owner_id. I even tried explicitly setting the foreign key and that does not work. I also checked lighthouse for a possible Rails 3 bug but no luck.

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  • In facebook connect, how can I check if a user is a fan of my facebook page? Is it possible to track

    - by Tony
    I am trying to determine if a user is a facebook fan. I load the facebook JS library and initialize: <script type="text/javascript" src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/en_US"></script> FB_RequireFeatures(["XFBML","Connect","Api"], function() { FB.init("my_api_key","xd_receiver.htm") }); FB.ensureInit(function () { FB.ApiClient.pages_isFan(my_profile_id,"some_UID",callback); }); However when I call the API client with FB.ApiClient.pages_isFan, I get a JS error - FB.ApiClient is undefined I am also using the FBML fan tag to display the "become a fan" button: <fb:fan profile_id="my_profile_id" stream="0" connections="10" logobar="1" width="300"></fb:fan> And would like to be notified when either the "become a fan" button is clicked or a user has successfully become a fan. The business logic is pretty simple - If they become a fan, track it in my database. Then if they try to become a fan again, check with the library if they are a fan and say "You are already a fan" if they are a fan, show the widget if not.

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  • XSL-stylesheet URI using JAX-WS and Glassfish v3.

    - by Tony
    Hi there. I'm trying to use XSL-stylesheets in order to transform some generated XML-data to HTML-output. The architecture that I'm using is as follows: [Client Side] Web-Browser = [Server Side: Glassfish v3] JSP-pages - Web-Services. My web service generates some XML-data, then I want to format it with XSL-stylesheet, pass the result to JSP-page and show to user. I'm using JAXP for XSL-transformations and I want to create a javax.xml.transform.stream.StreamSource object with XSL-file stream for the javax.xml.transform.Transformer object, but I'm having a difficulty with specifying the path/URL for the XSL-file. So the question is: where should I put my XSL-stylesheets in a project and how should I access them from code? I'm using Glassfish v3 and NetBeans 6.8. Thanks.

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  • COM Pointers and process termination

    - by Tony
    Can an unreleased COM pointer to an external process (still alive) cause that process to hang on destruction? Even with TerminateProcess called on it? Process A has a COM interface pointer reference to Process B, now Process B issues a TerminateProcess on A, if some COM interface pointer to Process B in Process A is not released properly, could it be that the process hangs on termination?

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  • How to effectively copy an array in java ?

    - by Tony
    The toArray method in ArrayList , Bloch uses both System.arraycopy and Arrays.copyOf to copy an array . public <T> T[] toArray(T[] a) { if (a.length < size) // Make a new array of a's runtime type, but my contents: return (T[]) Arrays.copyOf(elementData, size, a.getClass()); System.arraycopy(elementData, 0, a, 0, size); if (a.length > size) a[size] = null; return a; } How to compare these two copy method , when to use which ? Thanks.

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  • COM Dual Interfaces

    - by Tony
    A dual interface in COM is one that is able to be accessed via a DispInterface or via VTable methods. Now can someone tell me what is exactly what the difference is between the two methods? I thought that a VTable is a virtual table which holds the pointers to the different functions when implementing a class hierarchy which has virtual functions that can be overridden in child classes. However I do not see how this is related to a dual interface in COM?

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  • Handles and pointer to object

    - by Tony
    I have a python Interpreter written in C++, the PyRun_String function from the Python API is said to return a handle, however in my code I have it assigned to pointer to a PyObject? PyObject* presult = PyRun_String(code, parse_mode, dict, dict); Is this actually correct? Can you implicitly cast this handle to this object pointer? Should it not be a HANDLE instead?

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  • I need to implement C# deep copy constructors with inheritance. What patterns are there to choose fr

    - by Tony Lambert
    I wish to implement a deepcopy of my classes hierarchy in C# public Class ParentObj : ICloneable { protected int myA; public virtual Object Clone () { ParentObj newObj = new ParentObj(); newObj.myA = theObj.MyA; return newObj; } } public Class ChildObj : ParentObj { protected int myB; public override Object Clone ( ) { Parent newObj = this.base.Clone(); newObj.myB = theObj.MyB; return newObj; } } This will not work as when Cloning the Child only a parent is new-ed. In my code some classes have large hierarchies. What is the recommended way of doing this? Cloning everything at each level without calling the base class seems wrong? There must be some neat solutions to this problem, what are they? Can I thank everyone for their answers. It was really interesting to see some of the approaches. I think it would be good if someone gave an example of a reflection answer for completeness. +1 awaiting!

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  • [ASP.NET] Problems with error: "Access to the path <path> is denied."

    - by Tony
    Hi, I was looking for the the trick to resolve that error (google, stackoverflow.com etc) and every nothing works. I need to dinamically create an .aspx file via the asp.net application. What I've done to try fix it: 1) In the folder's Properties - Security, I've added IUSR_TONY and also IIS_IUSRS and allow them the Full control to the folder. Just to check if that will help. Nope, it won't. 2) in the IIS Manager, I tried to change the Application's Pool Defaults Identity (based on that) I checked all options, with no success I don't know what to do more to fix it. Any ideas ?

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  • How to set permissions or alter a git commit process when using local repositories

    - by Tony
    I have a server that contains a central git repository and one of my co-worker's development environment. My co-worker's repository's origin is the central git repository and he pushes there when he has some code to share. Likewise, I develop locally and push to the central git repository when I have some code to share, so my repository's origin is also the central git repository. The issue is that I have the central git repository under a "git" user's home directory. So when I push I am actually SSH'ing into the the server as the "git" user. To be even more clear, my config has these lines: $ more .git/config [remote "origin"] fetch = +refs/heads/*:refs/remotes/origin/* url = [email protected]:fsg [branch "master"] remote = origin merge = refs/heads/master When I push, git handles this SSH + push seamlessly with I am guessing some sort of git shell. The issue is that when my coworker pushes, he is logged in as himself for a user and gets a bunch of crazy permission errors. Is there a typical way to solve this problem without opening up git's directories to a group? I think this will be problematic when I push and therefore overwrite the the repository and those permissions are reset. Thanks!

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  • Quicksort causes stackoverflow...

    - by Tony
    I have the following code, (taken from here), but it causes a stackoverflow exception when there's two the same value's in the list to sort. Can someone help me what's causing this? public static IEnumerable<int> QSLinq(IEnumerable<int> _items) { if (_items.Count() <= 1) return _items; var _pivot = _items.First(); var _less = from _item in _items where _item < _pivot select _item; var _same = from _item in _items where _item == _pivot select _item; var _greater = from _item in _items where _item > _pivot select _item; return QSLinq(_less).Concat(QSLinq(_same)).Concat(QSLinq(_greater)); }

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  • Using the Callback Method on a View in ASP.NET MVC

    - by Tony
    I have a master page with that code: public string CallbackMethod; protected void Page_Load(object sender, EventArgs e) { CallbackMethod = Page.ClientScript.GetCallbackEventReference(this, "message", "Dodanie", "context", true); } /other code here/ then, in the View (which is based on that master page) I need to invoke the CallbackMethod string, but the problem is, the framework firstly renders the View, and then invokes the Page_Load method. As the obvious result, the error appears: the name 'CallbackMethod' does not exist in the current context. How do I fix this?

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