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  • C# Static constructors design problem - need to specify parameter

    - by Neil Dobson
    I have a re-occurring design problem with certain classes which require one-off initialization with a parameter such as the name of an external resource such as a config file. For example, I have a corelib project which provides application-wide logging, configuration and general helper methods. This object could use a static constructor to initialize itself but it need access to a config file which it can't find itself. I can see a couple of solutions, but both of these don't seem quite right: 1) Use a constructor with a parameter. But then each object which requires corelib functionality should also know the name of the config file, so this has to be passed around the application. Also if I implemented corelib as a singleton I would also have to pass the config file as a parameter to the GetInstance method, which I believe is also not right. 2) Create a static property or method to pass through the config file or other external parameter. I have sort of used the latter method and created a Load method which initializes an inner class which it passes through the config file in the constructor. Then this inner class is exposed through a public property MyCoreLib. public static class CoreLib { private static MyCoreLib myCoreLib; public static void Load(string configFile) { myCoreLib = new MyCoreLib(configFile); } public static MyCoreLib MyCoreLib { get { return myCoreLib; } } public class MyCoreLib { private string configFile; public MyCoreLib(string configFile) { this.configFile = configFile; } public void DoSomething() { } } } I'm still not happy though. The inner class is not initialized until you call the load method, so that needs to be considered anywhere the MyCoreLib is accessed. Also there is nothing to stop someone calling the load method again. Any other patterns or ideas how to accomplish this?

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  • Netflix OData API iPhone: Accessing more than just the title

    - by Neil Desai
    Netflix just recently announced that they have a new OData API which gives developers access to more of their catalog and is exactly what I've been looking for. Also, on odata.org they have a sample iphone objective-c sdk that accesses the netflix odata api and displays a few movie titles in a tableview with a navigationcontroller. http://odataobjc.codeplex.com/ I'm just messing around right now and I would like to access more than just the catalog titles but I have no idea how to. Preferably, I would like to just push another view controller that will implement a page that can display the synopsis etc. Any suggestions on how to access the other data elements of a movie? Thanks

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  • asp:CustomValidator / OnServerValidate

    - by Neil
    I have a CheckBoxList that I am trying to validate that at least one of the checkboxes is checked. Markup: <asp:CustomValidator ID="RequiredFieldValidator8" ValidationGroup="EditArticle" runat="server" ErrorMessage="At least one Category is required." OnServerValidate="topic_ServerValidate" /> <asp:CheckBoxList id="checkboxlistCategories" runat="server"></asp:CheckBoxList> Code-behind: protected void topic_ServerValidate(object source, ServerValidateEventArgs args) { int i = 0; foreach (ListItem item in checkboxlistCategories.Items) { if (item.Selected == true) i = i + 1; } if (i == 0) args.IsValid = false; else args.IsValid = true; } If I add ControlToValidate="checkboxlistCategories" in the CustomValidator control, it blows up! Am I missing something? Thanks in advance.

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  • WinForms: Why is Control.Parent null?

    - by Neil Barnwell
    I'm trying to get the parent of a listview docked within a splitcontainer, and am finding that ListView.Parent is null. According to the documentation this should be: A Control that represents the parent or container control of the control. Can anyone explain why this property would be null? I've tried moving the ListView to the Form (in order to rule out weird behaviour when docked in a splitcontainer) to no avail.

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  • Regex to Strip Special Characters

    - by Neil
    I am trying to use regex.replace to strip out unwanted characters, but I need to account for spaces: string asdf = "doésn't work?"; string regie = @"([{}\(\)\^$&._%#!@=<>:;,~`'\’ \*\?\/\+\|\[\\\\]|\]|\-)"; Response.Write(Regex.Replace(asdf,regie,"").Replace(" ","-")); returns doésntwork instead of doésnt-work Ideas? Thanks!

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  • iphone uitableview load next detail view from segmented control like mail app

    - by Neil
    Hi i have added a segmented control to a detailview header in a subview of a uitableview table and used images for up and down to create a up and down control like the one in mail.app. the buttons are working fine. im after some advice on how to get rid of that items view and reload the next item without having to go back to the main uitableview. im sure i saw some code on this website doing exactly that but i cant find it! can anyone point me in right direction or help? thanks

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  • Using a REST API and iPhone/Objective-C

    - by Neil Desai
    So I'm brand new to Netflix's API and have never used an API ever before. I'm ok with Objective-C and Cocoa Touch but just have no clue where to start when accessing the API and how to in general. Can someone help me get started with some code that will access titles in Netflix or just how to access a REST API in general with authentication. Thanks. Update: I've looked at the documents and I'm still a little lost because the Netflix API is a little weird with OAuth. Any help?

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  • Good event calendaring / scheduling design guide?

    - by Neil McF
    Hello, In an application I'm designing, the user has to be able to specify rather complex event scheduling (continuous time-block vs. daily time-blocks, exception date/times, recurrence patterns etc.) Does anyone know of a good design page for such a thing online? For example, I was highly impressed with this page's description of how to do database audit trails, and would love something similar. Thanks.

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  • OSCommerce checkout success page tracking

    - by Neil Bradley
    Hi there, I'm installing some tracking code into the checkout_success.php page. I need to be able to grab the coupon code/discount code name from the order, if one was used so that I can echo it out in my tracking script. I was wondering if anyone knows how to do this? I'm using this contribution of discount coupons; ot_discount_coupons.php, August 4, 2006, author: Kristen G. Thorson, ot_discount_coupon_codes version 3.0 It seems that the coupon code is not actually stored in the order_totals, but in a seperate discount_coupons_to_orders table. is there a query i can do on this table to find the matching coupon code used for this order? i tried the following but it return nothing; $coupon_query = tep_db_query("select coupons_id from discount_coupons_to_orders where orders_id = '".(int)$orders['orders_id']."' ORDER BY orders_id DESC LIMIT 1"); $coupon_id = tep_db_fetch_array($coupon_query); $couponid = $coupon_id['coupon_id']; Thank you.

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  • How can I get this code involving unique_ptr and emplace_back to compile?

    - by Neil G
    #include <vector> #include <memory> using namespace std; class A { public: A(): i(new int) {} A(A const& a) = delete; A(A &&a): i(move(a.i)) {} unique_ptr<int> i; }; class AGroup { public: void AddA(A &&a) { a_.emplace_back(move(a)); } vector<A> a_; }; int main() { AGroup ag; ag.AddA(A()); return 0; } does not compile... (says that unique_ptr's copy constructor is deleted) I tried replacing move with forward. Not sure if I did it right, but it didn't work for me.

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  • Linq Left Outer Join

    - by Neil
    I am new to LINQ and am trying to convert a SQL query to LINQ: SQL: left outer join PRODUCT_BEST_USE pbu on pbu.PRODUCT_GUID = @uProductId and pbu.BEST_USE_GUID = bu.BEST_USE_GUID LINQ: from PBU in PRODUCT_BEST_USE.Where(PBU=>PBU.PRODUCT_GUID == p.PRODUCT_GUID).DefaultIfEmpty() When I add and PBU.BEST_USE_GUID equals BU.BEST_USE_GUID, I get an error: "A query body must end with a select clause or a group clause" Here is the full Linq query: from p in PRODUCT join BU in BEST_USE on p.CATEGORY_GUID equals BU.CATEGORY_GUID from PBU in PRODUCT_BEST_USE.Where(PBU=>PBU.PRODUCT_GUID == p.PRODUCT_GUID).DefaultIfEmpty() and PBU.BEST_USE_GUID equals BU.BEST_USE_GUID where p.PRODUCT_GUID == new Guid("d317752b-581d-4f43-92fa-4a4af91009f5") select new { BU.NAME, PBU.PRODUCT_BEST_USE_GUID }

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  • Creating colour schemes based on an existing scheme

    - by Neil Barnwell
    I have a colour scheme based around yellow, for warning messages on a website. It amounts to a slightly orange bordered box, with a pale yellow fill. The exact colours are: #FED626 (border) #FFF7C0 (fill) I want to know if it's possible to convert this scheme mathematically or algorithmically somehow, to come up with a blue version where the border is the "same amount" of blue as this one is yellow. Is this possible, or do I just "pin the tail on the donkey" on a colour pallet to get roughly the right one? I ask, because I'd quite like to be able to calculate this on the fly, to perhaps implement something in .less. To give you an idea, I tried swopping the red and blue values on those two, and came up with this: #26D6FE (border) #C0F7FF (fill) That wasn't too hard, but think about if I wanted a pink colour scheme... :)

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  • Converting python collaborative filtering code to use Map Reduce

    - by Neil Kodner
    Using Python, I'm computing cosine similarity across items. given event data that represents a purchase (user,item), I have a list of all items 'bought' by my users. Given this input data (user,item) X,1 X,2 Y,1 Y,2 Z,2 Z,3 I build a python dictionary {1: ['X','Y'], 2 : ['X','Y','Z'], 3 : ['Z']} From that dictionary, I generate a bought/not bought matrix, also another dictionary(bnb). {1 : [1,1,0], 2 : [1,1,1], 3 : [0,0,1]} From there, I'm computing similarity between (1,2) by calculating cosine between (1,1,0) and (1,1,1), yielding 0.816496 I'm doing this by: items=[1,2,3] for item in items: for sub in items: if sub >= item: #as to not calculate similarity on the inverse sim = coSim( bnb[item], bnb[sub] ) I think the brute force approach is killing me and it only runs slower as the data gets larger. Using my trusty laptop, this calculation runs for hours when dealing with 8500 users and 3500 items. I'm trying to compute similarity for all items in my dict and it's taking longer than I'd like it to. I think this is a good candidate for MapReduce but I'm having trouble 'thinking' in terms of key/value pairs. Alternatively, is the issue with my approach and not necessarily a candidate for Map Reduce?

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  • Q on Python serialization/deserialization

    - by neil
    What chances do I have to instantiate, keep and serialize/deserialize to/from binary data Python classes reflecting this pattern (adopted from RFC 2246 [TLS]): enum { apple, orange } VariantTag; struct { uint16 number; opaque string<0..10>; /* variable length */ } V1; struct { uint32 number; opaque string[10]; /* fixed length */ } V2; struct { select (VariantTag) { /* value of selector is implicit */ case apple: V1; /* VariantBody, tag = apple */ case orange: V2; /* VariantBody, tag = orange */ } variant_body; /* optional label on variant */ } VariantRecord; Basically I would have to define a (variant) class VariantRecord, which varies depending on the value of VariantTag. That's not that difficult. The challenge is to find a most generic way to build a class, which serializes/deserializes to and from a byte stream... Pickle, Google protocol buffer, marshal is all not an option. I made little success with having an explicit "def serialize" in my class, but I'm not very happy with it, because it's not generic enough. I hope I could express the problem. My current solution in case VariantTag = apple would look like this, but I don't like it too much import binascii import struct class VariantRecord(object): def __init__(self, number, opaque): self.number = number self.opaque = opaque def serialize(self): out = struct.pack('>HB%ds' % len(self.opaque), self.number, len(self.opaque), self.opaque) return out v = VariantRecord(10, 'Hello') print binascii.hexlify(v.serialize()) >> 000a0548656c6c6f Regards

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  • How can I get this code involving unique_ptr to compile?!

    - by Neil G
    #include <vector> #include <memory> using namespace std; class A { public: A(): i(new int) {} A(A const& a) = delete; A(A &&a): i(move(a.i)) {} unique_ptr<int> i; }; class AGroup { public: void AddA(A &&a) { a_.emplace_back(move(a)); } vector<A> a_; }; int main() { AGroup ag; ag.AddA(A()); return 0; } does not compile... (says that unique_ptr's copy constructor is deleted) I tried replacing move with forward. Not sure if I did it right, but it didn't work for me.

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  • wcf metadata service page url

    - by Neil B
    I have a service with the metadata exposed. Trouble is when I browse to the wsdl the service page it has the machine name as below: MasterLibrary Service You have created a service. To test this service, you will need to create a client and use it to call the service. You can do this using the svcutil.exe tool from the command line with the following syntax: svcutil.exe http://mymachine/Master/Master.svc?wsdl How do I make it show it as: http://www.url.co.uk/Master/Master.svc?wsdl

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  • What is the security advantage of STS in web services?

    - by Neil McF
    Hello, I've started reading up on security (particularly authentication) with web services and I see a lot of references to security token services. From what I see, they take a username-password (or something) and, on validation, return a digital token. How is using this token any more secure then just relying on the username-password in the first place?

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  • Securing S3 via your own application

    - by Neil Middleton
    Imagine the following use case: You have a basecamp style application hosting files with S3. Accounts all have their own files, but stored on S3. How, therefore, would a developer go about securing files so users of account 1, couldn't somehow get to files of account 2? We're talking Rails if that's a help.

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  • Phantomjs creating black output from SVG using page.render

    - by Neil Young
    I have been running PhantomJS 1.9.6 happily on a turnkey Linux server for about 4 months now. Its purpose is to take an SVG file and create different sizes using the page.render function. This has been doing this but since a few days ago has started to generate a black mono output. Please see below: The code: var page = require('webpage').create(), system = require('system'), address, output, ext, width, height; if ( system.args.length !== 4 ) { console.log("{ \"result\": false, \"message\": \"phantomjs.rasterize: error need address, output, extension arguments\" }"); //console.log('phantomjs.rasterize: error need address, output, extension arguments'); phantom.exit(1); } else if( system.args[3] !== "jpg" && system.args[3] !== "png"){ console.log("{ \"result\": false, \"message\": \"phantomjs.rasterize: error \"jpg\" or \"png\" only please\" }"); //console.log('phantomjs.rasterize: error "jpg" or "png" only please'); phantom.exit(1); } else { address = system.args[1]; output = system.args[2]; ext = system.args[3]; width = 1044; height = 738; page.viewportSize = { width: width, height: height }; //postcard size page.open(address, function (status) { if (status !== 'success') { console.log("{ \"result\": false, \"message\": \"phantomjs.rasterize: error loading address ["+address+"]\" }"); //console.log('phantomjs.rasterize: error loading address ['+address+'] '); phantom.exit(); } else { window.setTimeout(function () { //--> redner full size postcard page.render( output + "." + ext ); //--> redner smaller postcard page.zoomFactor = 0.5; page.clipRect = {top:0, left:0, width:width*0.5, height:height*0.5}; page.render( output + ".50." + ext); //--> redner postcard thumb page.zoomFactor = 0.25; page.clipRect = {top:0, left:0, width:width*0.25, height:height*0.25}; page.render( output + ".25." + ext); //--> exit console.log("{ \"result\": true, \"message\": \"phantomjs.rasterize: success ["+address+"]>>["+output+"."+ext+"]\" }"); //console.log('phantomjs.rasterize: success ['+address+']>>['+output+'.'+ext+']'); phantom.exit(); }, 100); } }); } Does anyone know what can be causing this? There have been no server configuration changes that I know of. Many thanks for your help.

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  • Should I throw my own ArgumentOutOfRangeException or let one bubble up from below?

    - by Neil N
    I have a class that wraps List< I have GetValue by index method: public RenderedImageInfo GetValue(int index) { list[index].LastRetrieved = DateTime.Now; return list[index]; } If the user requests an index that is out of range, this will throw an ArgumentOutOfRangeException . Should I just let this happen or check for it and throw my own? i.e. public RenderedImageInfo GetValue(int index) { if (index >= list.Count) { throw new ArgumentOutOfRangeException("index"); } list[index].LastRetrieved = DateTime.Now; return list[index]; } In the first scenario, the user would have an exception from the internal list, which breaks mt OOP goal of the user not needing to know about the underlying objects. But in the second scenario, I feel as though I am adding redundant code. Edit: And now that I think of it, what about a 3rd scenario, where I catch the internal exception, modify it, and rethrow it?

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  • Difference between generator expression and generator function

    - by Neil G
    Is there any difference — performance or otherwise — between generator expressions and generator functions? In [1]: def f(): ...: yield from range(4) ...: In [2]: def g(): ...: return (i for i in range(4)) ...: In [3]: f() Out[3]: <generator object f at 0x109902550> In [4]: list(f()) Out[4]: [0, 1, 2, 3] In [5]: list(g()) Out[5]: [0, 1, 2, 3] In [6]: g() Out[6]: <generator object <genexpr> at 0x1099056e0>

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  • Most efficient way to solve system of equations involving the digamma function?

    - by Neil G
    What is the most efficient way to solve system of equations involving the digamma function? I have a vector v and I want to solve for a vector w such that for all i: digamma(sum(w)) - digamma(w_i) = v_i and w_i 0 I found the gsl function gsl_sf_psi, which is the digamma function. Is there an identity I can use to reduce the equations? Is my best bet to use a solver? I am using C++0x; which solver is easiest to use and fast?

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  • LLBL Gen Predicate Filter

    - by Neil
    I am new to LLBLGen Pro and am checking for duplicate, I have the following SQL: SQL: select a.TopicId,atc.TopicCategoryId,a.Headline from article a inner join ArticleTopicCategory atc on atc.ArticleId = a.Id where a.TopicId = 'C0064FAE-093B-466E-8745-230534867D2F' and a.Headline = 'Test' and atc.TopicCategoryId in ('004D64F7-474C-48F9-9887-17B1E7532A84') Whenever I step though my function, it always returns 0: LLBLGen Code: public bool CheckDuplicateArticle(Guid topicId, List<Guid> categories, string headline) { ArticleCollection articles = new ArticleCollection(); PredicateExpression filter = new PredicateExpression(); RelationCollection relation = new RelationCollection(); relation.Add(ArticleEntity.Relations.ArticleTopicCategoryEntityUsingArticleId); filter.AddWithAnd(ArticleFields.TopicId == topicId); filter.AddWithAnd(ArticleTopicCategoryFields.Id == categories); filter.AddWithAnd(ArticleFields.Headline == headline); articles.GetMulti(filter, 0, null, relation); return articles.Count > 0; } Any help would be appreciated!

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