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Articles indexed in May 2010

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  • Algorithm for creating a school timetable.

    - by cand
    Hello all. I've been wondering if there are known solutions for algorithm of creating a school timetable. Basically, it's about optimizing "hour-dispersion" (both in teachers and classes case) for given class-subject-teacher associations. We can assume that we have sets of classes, lesson subjects and teachers associated with each other at the input and that timetable should fit between 8AM and 4PM. I guess that there is probably no accurate algorithm for that, but maybe someone knows a good approximation or hints for developing it. P.S. I know, there was http://stackoverflow.com/questions/1259686/school-timetable-generation-algorithm-closed , but unlike in that case, I'm not looking for actual implementation, rather for thoughts on how to do it or why it's impossible.

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  • How should I check that a given argument is a datetime.date object?

    - by rmh
    I'm currently using an assert statement with isinstance. Because datetime is a subclass of date, I also need to check that it isn't an instance of datetime. Surely there's a better way? from datetime import date, datetime def some_func(arg): assert isinstance(arg, date) and not isinstance(arg, datetime),\ 'arg must be a datetime.date object' # ...

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  • C++, Get text from a website, part 3

    - by pure841
    So, thanks for all the help guys, I am just have one last problem, I am putting the website source in a char var, and then reading the product title (I have gotten that), however it only works if I take part of the source, or only the html from one of the featured products on neweggs page. I think the program is crashing, because it doesnt know which title to pick when I need to get all three titles and put them into an array. Any ideas? Thanks. Here is the parser code: http://paste2.org/p/809045 Any solution is greatly appreciated.

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  • Create a CBitmap from Resources ID

    - by Smashery
    I need to fill a CImageList with a number of bitmaps which are stored in separate bmp files (rather than as a single bmp with numerous parts). I assume I need to create a CBitmap so I can call the Add method of CImageList. So how might one create a CBitmap object using only MFC Resource IDs?

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  • Nullable<T> as a parameter

    - by ferch
    I alredy have this: public static object GetDBValue(object ObjectEvaluated) { if (ObjectEvaluated == null) return DBNull.Value; else return ObjectEvaluated; } used like: List<SqlParameter> Params = new List<SqlParameter>(); Params.Add(new SqlParameter("@EntityType", GetDBValue(EntityType))); Now i wanted to keep the same interface but extend that to use it with nullable public static object GetDBValue(int? ObjectEvaluated) { if (ObjectEvaluated.HasValue) return ObjectEvaluated.Value; else return DBNull.Value; } public static object GetDBValue(DateTime? ObjectEvaluated) {...} but i want only 1 function GetDBValue for nullables. How do I do that and keep the call as is is? Is that possible at all? I can make it work like: public static object GetDBValue<T>(Nullable<T> ObjectEvaluated) where T : struct { if (ObjectEvaluated.HasValue) return ObjectEvaluated.Value; else return DBNull.Value; } But the call changes to: Params.Add(new SqlParameter("@EntityID ", GetDBValue<int>(EntityID)));

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  • ASP.NET MVC 2 InputExtensions different on server than local machine

    - by Mike
    Hi everyone, So this is kind of a crazy problem to me, but I've had no luck Googling it. I have an ASP.NET MVC 2 application (under .NET 4.0) running locally just fine. When I upload it to my production server (under shared hosting) I get Compiler Error Message: CS1061: 'System.Web.Mvc.HtmlHelper' does not contain a definition for 'TextBoxFor' and no extension method 'TextBoxFor' accepting a first argument of type 'System.Web.Mvc.HtmlHelper' could be found (are you missing a using directive or an assembly reference?) for this code: <%= this.Html.TextBoxFor(person => person.LastName) %> This is one of the new standard extension methods in MVC 2. So I wrote some diagnostic code: System.Reflection.Assembly ass = System.Reflection.Assembly.GetAssembly(typeof(InputExtensions)); Response.Write("From GAC: " + ass.GlobalAssemblyCache.ToString() + "<br/>"); Response.Write("ImageRuntimeVersion: " + ass.ImageRuntimeVersion.ToString() + "<br/>"); Response.Write("Version: " + System.Diagnostics.FileVersionInfo.GetVersionInfo(ass.Location).ToString() + "<br/>"); foreach (var method in typeof(InputExtensions).GetMethods()) { Response.Write(method.Name + "<br/>"); } running locally (where it works fine), I get this as output: From GAC: True ImageRuntimeVersion: v2.0.50727 Version: File: C:\Windows\assembly\GAC_MSIL\System.Web.Mvc\2.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll InternalName: System.Web.Mvc.dll OriginalFilename: System.Web.Mvc.dll FileVersion: 2.0.50217.0 FileDescription: System.Web.Mvc.dll Product: Microsoft® .NET Framework ProductVersion: 2.0.50217.0 Debug: False Patched: False PreRelease: False PrivateBuild: False SpecialBuild: False Language: Language Neutral CheckBox CheckBox CheckBox CheckBox CheckBox CheckBox CheckBoxFor CheckBoxFor CheckBoxFor Hidden Hidden Hidden Hidden HiddenFor HiddenFor HiddenFor Password Password Password Password PasswordFor PasswordFor PasswordFor RadioButton RadioButton RadioButton RadioButton RadioButton RadioButton RadioButtonFor RadioButtonFor RadioButtonFor TextBox TextBox TextBox TextBox TextBoxFor TextBoxFor TextBoxFor ToString Equals GetHashCode GetType and when running on the production server (where it fails), I see: From GAC: True ImageRuntimeVersion: v2.0.50727 Version: File: C:\Windows\assembly\GAC_MSIL\System.Web.Mvc\2.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll InternalName: System.Web.Mvc.dll OriginalFilename: System.Web.Mvc.dll FileVersion: 2.0.41001.0 FileDescription: System.Web.Mvc.dll Product: Microsoft® .NET Framework ProductVersion: 2.0.41001.0 Debug: False Patched: False PreRelease: False PrivateBuild: False SpecialBuild: False Language: Language Neutral CheckBox CheckBox CheckBox CheckBox CheckBox CheckBox Hidden Hidden Hidden Hidden Hidden Hidden Password Password Password Password RadioButton RadioButton RadioButton RadioButton RadioButton RadioButton TextBox TextBox TextBox TextBox ToString Equals GetHashCode GetType note that "TextBoxFor" is not present (hence the error). I have MVC referenced in the csproj: <Reference Include="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"> <SpecificVersion>True</SpecificVersion> <HintPath>References\System.Web.Mvc.dll</HintPath> <Private>True</Private> </Reference> I just can't figure it what to do next. Thoughts? Thanks! -Mike

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  • Can you point me to current examples using NHibernate in an ASP.NET MVC2 app?

    - by alphadogg
    Can anyone point me to any self-contained, complete, current reference materials/projects using NHibernate in an ASP.NET MVC2 application? I have looked at Sharp Architecture, but I am not sure I need the complexity in that project. I certainly don't know enough about it to know if it is over-engineered for my purposes. I would like to see more types of implementations to gauge the various ways people have skinned this cat.

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  • jqModal dialog always under overlay.

    - by ProfK
    I have the following code, and am at my wit's end because the dialog always appears under the overlay. Any advice will be most appreciated: <head runat="server"> <title></title> <link href="../Styles/jqModal.css" rel="stylesheet" type="text/css" /> <style type="text/css"> #shift-edit-popup { display: none; } </style> <script src="../Scripts/jquery-1.4.2.js" type="text/javascript"></script> <script src="../Scripts/jqModal.js" type="text/javascript"></script> <script type="text/javascript"> $(function () { $("#shift-edit-popup").jqm({ toTop: true }).jqmAddTrigger("#show-button"); }); </script> </head> <body> <form id="form" runat="server"> <input id="show-button" type="button" value="Show" /> <div id="shift-edit-popup"> <div> <asp:Label ID="resourceLabel" runat="server" AssociatedControlID="resourceList">Resource:</asp:Label> <asp:DropDownList ID="resourceList" runat="server" DataTextField="Name" DataValueField="ResourceId" Width="120px"> </asp:DropDownList> </div> </div> </body>

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  • Should DKIM signing happen in the application or the MTA?

    - by thomasrutter
    I'm trying to weigh up whether DKIM signing should be done by the application sending mail (for instance, the mailing list software you're using) or at the mail transfer agent (sendmail, postfix etc). Do you know any good arguments either way? As far as I can see, doing it at the MTA, such as with dkim-milter, is a lot easier to set up. However, if anyone gets access to the server, even just a normal unprivileged account such as a web hosting client's login, they'd be able to send email using sendmail and get the full blessing of my DKIM signature. What do you think is the best solution for my situation? I'm using a Debian server with apache, postfix, php&mysql, etc.

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  • SQLAuthority News – Microsoft SQL Server 2005/2008 Query Optimization & Performance Tuning Training

    - by pinaldave
    Last 3 days to register for the courses. This is one time offer with big discount. The deadline for the course registration is 5th May, 2010. There are two different courses are offered by Solid Quality Mentors 1) Microsoft SQL Server 2005/2008 Query Optimization & Performance Tuning – Pinal Dave Date: May 12-14, 2010 Price: Rs. 14,000/person for 3 days Discount Code: ‘SQLAuthority.com’ Effective Price: Rs. 11,000/person for 3 days 2) SharePoint 2010 – Joy Rathnayake Date: May 10-11, 2010 Price: Rs. 11,000/person for 3 days Discount Code: ‘SQLAuthority.com’ Effective Price: Rs. 8,000/person for 2 days Download the complete PDF brochure. To register, either send an email to [email protected] or call +91 95940 43399. Feel free to drop me an email at pinal “at” SQLAuthority.com for any additional information and clarification. Training Venue: Abridge Solutions, #90/B/C/3/1, Ganesh GHR & MSY Plaza, Vittalrao Nagar, Near Image Hospital, Madhapur, Hyderabad – 500 081. Additionally there is special program of SolidQ India Insider. This is only available to first few registrants of the courses only. Read more details about the course here. Read my TechEd India 2010 experience here. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Optimization, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, SQL Training, SQLAuthority News, T SQL, Technology

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  • Wise Selection of SEO Services Company

    As a site owner, you have to be wise enough in the selection of the SEO services company that will help your site rank high in the search engine. Be aware to some companies who are just interested with your money that will give you a poor outcome.

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  • Search Engine Optimization - A Part of Web Promotion

    Search Engine Optimization (SEO) is considered as a technical part of Web promotion. This is true because it does lend a hand in the advertising of websites and simultaneously it requires some technical understanding - as a minimum familiarity with fundamental HTML. It is sometimes also called SEO copyrighting since most of the practice that are used to egg on sites in search engines pact with text.

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  • How to use C to write a C compiler?

    - by israkir
    I am taking a compiler course this semester and we talked about this interesting thing in the class. Teacher used an example of p-code along with pascal to explain it. After google-ing a bit, I saw this phenomena is called self-hosting and naturally related to the first compilers. Ok, there is an interpreter which interprets the compiler source code written in its own language. But, there is still something missing in the explanations I found. I mean, there are some parts still looks mysterious (what about the interpreter? it is also a program, still need to be translated into machine code etc...) What I am asking you guys is that can you explain it as simple as possible or provide any online resource which you think that it explains this phenomena precisely..

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  • Fixed mouse pointer with jQuery draggable

    - by MikeWyatt
    I'm building a little game in HTML5. The canvas element is a viewport into the game world. The user can move the viewport's position in the world by clicking and dragging with the mouse on a small icon. The problem is that the scrolling stops when the mouse pointer hits the edge of the screen. In all likelihood, that will limit scrolling in one of the directions severely, since the icon will be in one of the corners of the page. The only technical solution I can think of would be to somehow fix the mouse pointer's position on the icon and detect the relative movement each frame. Basically I would just reset the pointer position back to the center of the icon after each drag event. Unfortunately, I'm fairly positive that this is not possible. Playing with the user's pointer is a big no-no from a usability and security standpoint. So, is there any other way to do what I want? I'm primarily looking for technical ideas here, but suggestions for a more appropriate interface would also be welcome.

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  • What's the reason both Image and Bitmap classes don't implement a custom equality/hashcode logic?

    - by devoured elysium
    From MSDN documentation, it seems as both GetHashCode() and Equals() haven't been overriden in Bitmap. Neither have them been overriden in Image. So both classes are using the Object's version of them just compares references. I wasn't too convinced so I decided to fire up Reflector to check it out. It seems MSDN is correct in that matter. So, is there any special reason why MS guys wouldn't implement "comparison logic", at least for the Bitmap class? I find it is kinda acceptable for Image, as it is an abstract class, but not so much for the Bitmap class. I can see in a lot of situations calculating the hash code can be an expensive operation, but it'd be alright if it used some kind of lazy evaluation (storing the computed hash code integer in a variable a variable, so it wouldn't have to calculate it later again). When wanting to compare 2 bitmaps, will I have to resort to having to run all over the picture comparing each one of its pixels? Thanks

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  • What is the fastest way to validate that a field has no more than n words?

    - by James A. Rosen
    I have a Ruby-on-Rails model: class Candidate < ActiveRecord::Base validates_presence_of :application_essay validate :validate_length_of_application_essay protected def validate_length_of_application_essay return if application_essay.blank? # don't add a second error message if they didn't fill it out errors.add(:application_essay, :too_long), unless ... end end Without dropping into C, what is the fastest way to check that the application_essay contains no more than 500 words? You can assume that most essays will be at least 200 words, are unlikely to be more than 5000 words, and are in English (or the pseudo-English sometimes called "business-ese"). You can also classify anything you want as a "word" as long as your classification would be immediately obvious to a typical user. (NB: this is not the place to debate what a "typical user" is :) )

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  • Broadcasting an intent to a specific component.

    - by Nic Strong
    I have an activity that is starting a background operation in another service. This activity receives various notifications from this service. As part of the intent I use to initiate the background operation I pass extra data with the context of my activity so the background service can broadcast intents back to me (the download service is a good example of this usage). So in the activity I use the following to attach the context: intent.putExtra(Intents.EXTRA_NOTIFICATION_PACKAGE, IntentTestActivity.this.getPackageName()); intent.putExtra(Intents.EXTRA_NOTIFICATION_CLASS, IntentTestActivity.class.getCanonicalName()); intent.putExtra(Intents.EXTRA_NOTIFICATION_EXTRAS, myContext); I register for the notifications in the activity: IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(Intents.ACTION_NOTIFICATION); intentFilter.addCategory(Intents.CATEGORY_COMPLETION); intentFilter.addCategory(Intents.CATEGORY_PROGRESSS); Intent intent = registerReceiver(receiver, intentFilter); In the background service I send notifications with the following code: void broadcastNotification(String action, String category, String packageName, String className, String extras, int operationResult) { Intent intent = new Intent(action); intent.addCategory(category); intent.setClassName(packageName, className); if (extras != null) { intent.putExtra(Intents.EXTRA_NOTIFICATION_EXTRAS, extras); } intent.putExtra(Intents.EXTRA_OPERATION_RESULT, operationResult); context.sendBroadcast(intent); } My problem is that the above broadcast will never be received. If however I comment out the line intent.setClassName(packageName, className); Then the broadcast is received. Is it a problem with my filter? Do I have to specify intents intended for a specific component? Or cannot I not use such fine grain control over the delivery of broadcasts. Thanks, Nic

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  • Splitting a filename into words and numbers in Python

    - by danspants
    The following code splits a string into a list of words but does not include numbers: txt="there_once was,a-monkey.called phillip?09.txt" sep=re.compile(r"[\s\.,-_\?]+") sep.split(txt) ['there', 'once', 'was', 'a', 'monkey', 'called', 'phillip', 'txt'] This code gives me words and numbers but still includes "_" as a valid character: re.findall(r"\w+|\d+",txt) ['there_once', 'was', 'a', 'monkey', 'called', 'phillip', '09', 'txt'] What do I need to alter in either piece of code to end up with the desired result of: ['there', 'once', 'was', 'a', 'monkey', 'called', 'phillip', '09', 'txt']

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