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  • When is assembler faster than C?

    - by Adam Bellaire
    One of the stated reasons for knowing assembler is that, on occasion, it can be employed to write code that will be more performant than writing that code in a higher-level language, C in particular. However, I've also heard it stated many times that although that's not entirely false, the cases where assembler can actually be used to generate more performant code are both extremely rare and require expert knowledge of and experience with assembler. This question doesn't even get into the fact that assembler instructions will be machine-specific and non-portable, or any of the other aspects of assembler. There are plenty of good reasons for knowing assembler besides this one, of course, but this is meant to be a specific question soliciting examples and data, not an extended discourse on assembler versus higher-level languages. Can anyone provide some specific examples of cases where assembler will be faster than well-written C code using a modern compiler, and can you support that claim with profiling evidence? I am pretty confident these cases exist, but I really want to know exactly how esoteric these cases are, since it seems to be a point of some contention.

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  • HMAC SHA1 ColdFusion

    - by Chris
    Please help! I have been pulling out my hair over this one. :) I have a site that I need to HMAC SHA1 for authentication. It currently works with another language but now I need to move it to ColdFusion. For the life of me I cannot get the strings to match. Any assistance would be much appreciated. Data: https%3A%2F%2Fwww%2Etestwebsite%2Ecom%3Fid%3D5447 Key: 265D5C01D1B4C8FA28DC55C113B4D21005BB2B348859F674977B24E0F37C81B05FAE85FB75EA9CF53ABB9A174C59D98C7A61E2985026D2AA70AE4452A6E3F2F9 Correct answer: WJd%2BKxmFxGWdbw4xQJZXd3%2FHkFQ%3d My answer: knIVr6wIt6%2Fl7mBJPTTbwQoTIb8%3d Both are Base64 encoded and then URL encoded.

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  • How can I provide a different rendering target to Direct2D?

    - by fingerprint211b
    I'm using Direct2D in C# to render a small gui framework for my research project. I'm not very used to working on Windows or with DirectX. I'm using a Windows Forms control to create a render target, and msdn warns that since it uses BindDC, a the larger the rendering target, the worse the performance will be (which turned out to be a dramatic difference, when I maximize the window, I get around 15 fps). What would be a better way to create a render target for Direct2D? Is there a way to create a window and render directly to it, instead of rendering to a control's buffer first, and then rendering that? If so, how? Sorry if my English sucks, not my native language.

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  • 2d terrain generation in real time

    - by Skoder
    Hey, I'm trying to create a game similar to this (Note:When you click 'play', there are SFX in the game which you can't seem to turn off, so you may want to check volume). In particular, I'm interested in knowing how the 'infinite' landscape is generated. Are there any tutorials/articles describing this? I came across procedural generation, but I'm not quite sure what topics I should be looking for (or if it's even procedural generation). (I'm using C#, but I don't mind the language as I assume the theory behind it remains the same) Thanks for any suggestions

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  • Best practices for TDD BDD with code that uses external services / api

    - by adam
    I'm using a twitter gem which basically accesses twitter and lets me grab tweets, timeline etc. Its really good but I have a lot of my code that uses the stuff it returns and I need to test it. The things the gem returns aren't exactly simple strings, there pretty complex objects (scary as well) so im left scratching my head. So basically I'm looking for an answer, book, blog, open-source project that can show me the rights and wrongs of testing around external services. answers that are either not language centric or ruby/rails centric would most greatly be appreciated.

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  • Using numeric_limits::max() in constant expressions

    - by FireAphis
    Hello, I would like to define inside a class a constant which value is the maximum possible int. Something like this: class A { ... static const int ERROR_VALUE = std::numeric_limits<int>::max(); ... } This declaration fails to compile with the following message: numeric.cpp:8: error: 'std::numeric_limits::max()' cannot appear in a constant-expression numeric.cpp:8: error: a function call cannot appear in a constant-expression I understand why this doesn't work, but two things look weird to me: It seems to me a natural decision to use the value in constant expressions. Why did the language designers decide to make max() a function thus not allowing this usage? The spec claims in 18.2.1 that For all members declared static const in the numeric_limits template, specializations shall define these values in such a way that they are usable as integral constant expressions. Doesn't it mean that I should be able to use it in my scenario and doesn't it contradict the error message? Thank you.

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  • Web scraping with Python

    - by Jack
    I'm currently trying to scrape a website that has fairly poorly-formatted HTML (often missing closing tags, no use of classes or ids so it's incredibly difficult to go straight to the element you want, etc.). I've been using BeautifulSoup with some success so far but every once and a while (though quite rarely), I run into a page where BeautifulSoup creates the HTML tree a bit differently from (for example) Firefox or Webkit. While this is understandable as the formatting of the HTML leaves this ambiguous, if I were able to get the same parse tree as Firefox or Webkit produces I would be able to parse things much more easily. The problems are usually something like the site opens a <b> tag twice and when BeautifulSoup sees the second <b> tag, it immediately closes the first while Firefox and Webkit nest the <b> tags. Is there a web scraping library for Python (or even any other language (I'm getting desperate)) that can reproduce the parse tree generated by Firefox or WebKit (or at least get closer than BeautifulSoup in cases of ambiguity).

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  • Why is C# suddenly so popular?

    - by leeand00
    Why is C# suddenly so popular? There's been like a repeat explosion in the blogs lately about it; It reminds me of the earlier part of this decade when all of those frameworks for Java came out like Spring, JSF, Hibernate, Struts, Struts2, Tapestry etc... I've actually been thinking about learning C#, and it seems to contain a lot of qualities that it has gotten from Java (aside from it being completely cross-platform) But, it almost seems like a step backwards to me...its not totally multi-platform, a language that's run by a corporation rather than a community... (But, knowing this isn't the case, I've come here to find out why it isn't...) P.S. And yes, I am aware of the Mono project so that you can run it on Linux, but isn't it always behind the curve? A new version of Java would be supported on all the platforms.

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  • Organizing a project that uses multiple languages?

    - by calid
    I am currently working on a project that has components in perl, .NET, C/C++, and Java. These components are inter-related, but are not tied to the same release schedule. Due to the very different build/testing environment requirements, lumping them all in to the same /bin /src /lib /etc /tests hierarchy is a bit unwieldy. What are some good organizational hierarchies to use in source control when dealing with a project of this nature? I am currently leaning towards each language having its own branch: repo/project1/perl/main/... repo/project1/.NET/main/... repo/project1/Java/main/... How would your recommended hierarchy change if they DID have a tied release schedule?

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  • Why the good append syntax is so ugly, asks python newbie

    - by Cawas
    Now following my series of "python newbie questions" and based on another question. Go to http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html#other-languages-have-variables and scroll down to "Default Parameter Values". There you can find the following: def bad_append(new_item, a_list=[]): a_list.append(new_item) return a_list def good_append(new_item, a_list=None): if a_list is None: a_list = [] a_list.append(new_item) return a_list So, question here is: why is the "good" syntax over a known issue ugly like that in a programming language that promotes "elegant syntax" and "easy-to-use"? Why not just something in the definition itself, that the "argument" name is attached to a "localized" mutable object like: def better_append(new_item, a_list=[].local): a_list.append(new_item) return a_list I'm sure there would be a better way to do this syntax, but I'm also almost positive there's a good reason to why it hasn't been done. So, anyone happens to know why?

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  • Windows Azure Platform, latest version?

    - by Vimvq1987
    I searched through internet but found nothing. The whitepapers of Windows Azure Platform say something like that: In its first release, the maximum size of a single database in SQL Azure Database is 10 gigabytes A few things are omitted in the technology’s first release, however, such as the SQL Common Language Runtime (CLR) and support for spatial data. (Microsoft says that both will be available in a future version.) I want to know that Microsoft had updated Windows Azure Platform and removed these limits or not? I decided to post this question here instead of Serverfault.com because it's more relative to programming than administration. Thank you

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  • How do I parse boolean logic?

    - by d03boy
    I need to write a boolean logic parser which will translate the boolean logic language to a SQL WHERE clause. The order of the operands will always be in the correct order (with value on the right). Here is a relatively simple example. There could be nested parentheses and the use of NOT operators, etc. (CACOUNT=01 OR CACOUNT=02 OR CACOUNT=03 OR CACOUNT=05 OR CACOUNT=07 OR CACOUNT=09 OR CACOUNT=12 OR CACOUNT=13 OR CACOUNT=18) AND Q4=1 AND NAME=TIMOTHY Here is what the WHERE clause would resemble. WHERE ( EXISTS ( SELECT 1 FROM MyVerticalTable b WHERE b.Key=a.Key AND b.Key='CACOUNT' AND b.Value='01' ) )

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  • generate EF model by System.Diagnostics.Process

    - by loviji
    Hello, after read this article i tried generate EF model by System.Diagnostics.Process: Process myProcess = new Process(); var cs = "Data Source=.\\SQLEXPRESS; Initial Catalog=uqs; Integrated Security=SSPI"; myProcess.StartInfo.FileName = @"C:\Windows\Microsoft.NET\Framework\v3.5\EdmGen.exe"; myProcess.StartInfo.Arguments = "/mode:fullgeneration /c:"+cs+" project:School /entitycontainer:SchoolEntities /namespace:SchoolModel /language:CSharp "; myProcess.Start(); 1.but i haven't get a result, because i can't do well formed arguments string. As I tried, there have many quotes. how to organize argument string? 2.how can i catch if generation completed or have occurred errors?

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  • Use Javascript to copy Text from Label

    - by Josh
    Hello All- Label1 (asp.net control) is located inside Panel1 of my webpage and I have a button called bt. What is the Javascript to copy the Text from Label1 to the clipboard? Thanks, @ artlung, I placed the below code just outside of my form but inside the body. The last line of code I placed inside Panel1 of my form. Anything wrong with this code because nothing happens when I click the Copy to Clipboard button. <script language="JavaScript"> var clip = new ZeroClipboard.Client(); clip.addEventListener( 'mouseDown', function(client) { // set text to copy here clip.setText( document.getElementById('form1.Label1').value ); // alert("mouse down"); } ); clip.glue( 'd_clip_button' ); </script> The next line of code is above the script tags but inside Panel1 in my form <div id="d_clip_button">Copy To Clipboard</div>

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  • Wanting a simple overview on how to connect to a SQLite database in Cocoa/Objective-C

    - by Jesse
    Hi, everyone. I've been experimenting with Cocoa and Objective-C programming on the Mac for a few months now, and I am wanting to start developing applications that manage large amounts of data. The trouble is, I'm not really sure where to start with databases. I have a good background in Java programming with SQLite. I've read a bit about CoreData and I haven't been able to find any good resources for just manually connecting to the database. I'm looking for recommendations. Should I try CoreData, and if so, can anyone recommend a good tutorial for someone new to the language? Or, should I try to manually connect and query an SQLite database somehow, and, if so, any tutorials? Any help would be greatly appreciated! Thanks!

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  • Web scraping with Python

    - by Jack
    I'm currently trying to scrape a website that has fairly poorly-formatted HTML (often missing closing tags, no use of classes or ids so it's incredibly difficult to go straight to the element you want, etc.). I've been using BeautifulSoup with some success so far but every once and a while (though quite rarely), I run into a page where BeautifulSoup creates the HTML tree a bit differently from (for example) Firefox or Webkit. While this is understandable as the formatting of the HTML leaves this ambiguous, if I were able to get the same parse tree as Firefox or Webkit produces I would be able to parse things much more easily. The problems are usually something like the site opens a <b> tag twice and when BeautifulSoup sees the second <b> tag, it immediately closes the first while Firefox and Webkit nest the <b> tags. Is there a web scraping library for Python (or even any other language (I'm getting desperate)) that can reproduce the parse tree generated by Firefox or WebKit (or at least get closer than BeautifulSoup in cases of ambiguity).

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  • IRb: how to start an interactive ruby session with pre-loaded classes

    - by Shyam
    Hi, As I am going through my journey by adopting the Ruby language, I spend a lot of time inside IRb. It's just fantastic! But, as I am not very aware of it's capabilities, and still a nuby with Ruby, I would like to know the following: How can I 'flush' the session, without restarting IRb (or is this not possible). How can I configure IRb to load a bunch of source files "hello.rb" and "hello_objects.rb", i.e. at startup? I am heavily working in these and it would be nice to know a short hand to load these classes, without manually typing 'load' for each again. Thank you for your answers, comments and feedback!

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  • PHP Interview questions

    - by David
    Hi, does anyone have any thoughts on what would be considered good technicaly interviews for new php programmers. Im not meaning the little questions that are intended to know language specific intricacies but more on larger interview questions that potential employees may take an hour or 2 to solve in their own time and then come back with. Specifically im looking at PHP and object orientated but are there any ideas on suitable problems that a php programmer should be able to solve within a couple of hours? I am thinking that I want to have demonstrated object orientated techniques and also unit testing capabilities but as for that it can be anything.

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  • Taking learning into account in a development process

    - by Thiago
    How to deal with the fact that you don't know the language/framework in a development process? For instance, suppose a group of Java developers are about to start a .NET project, they don't know the platform well and might end up finding solutions that the framework already solves or solves better. The sort of questions I have are: which are the best practices in this case? Is RTFM before going on a good pratice? When should one stop RTFM and start asking/searching/playing? Is not RTFM and just searching/asking/playing a good practice? What about estimatives? I'd like to hear from your experience :-)

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  • groovy variable function

    - by bsreekanth
    I'm not even sure about how to title this qn. But, hope there is an easy way to do it in dynamic language like groovy. say I have a class Service, where I delegate the business logic. the methods in it are funA(), funB()... funX(). Now I have a controller class, where I call the service closure, which can be invoked like service.funA() . Now based on a variable (which can have values A, B ... X), I need to cal the correct service closure. Basically to avoid writing lot of if conditional statements. Something like service."fun+var"() would do. I'm not sure whether it is possible to substitute variable in closure (function)name. or any way by passing function (name) as a parameter...not sure I think PHP has a similar feature http://php.net/manual/en/functions.variable-functions.php thanks for any pointer..

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  • Firefox and TinyMCE 3.4.9 won't play nice together

    - by Patricia
    I've submitted a bug to the tinyMCE people, but i'm hoping someone else has come across this and has a suitable workaround. Here's the situation: I've got a form with a tinyMCE control that i load into a jquery dialog. it works great the first time, then after they close it, and open a new one. any interaction with the tinyMCE control gives: "Node cannot be used in a document other than the one in which it was created" it also doesn't fill the control with the text it's supposed to be prepopulated with. In my jquery dialogs i have the following scripts in my beforeClose handler: if (typeof tinyMCE != 'undefined') { $(this).find(':tinymce').each(function () { var theMce = $(this); tinyMCE.execCommand('mceFocus', false, theMce.attr('id')); tinyMCE.execCommand('mceRemoveControl', false, theMce.attr('id')); $(this).remove(); }); } and here's my tinyMCE setup script: $('#' + controlId).tinymce({ script_url: v2ScriptPaths.TinyMCEPath, mode: "none", elements: controlId, theme: "advanced", plugins: "paste", paste_retain_style_properties: "*", theme_advanced_toolbar_location: "top", theme_advanced_buttons1: "bold, italic, underline, strikethrough, separator, justifyleft, justifycenter, justifyright, justifyfull, indent, outdent, separator, undo, redo, separator, numlist, bullist, hr, link, unlink,removeformat", theme_advanced_buttons2: "fontsizeselect, forecolor, backcolor, charmap, pastetext,pasteword,selectall, sub, sup", theme_advanced_buttons3: "", language: v2LocalizedSettings.languageCode, gecko_spellcheck : true, onchange_callback: function (editor) { tinyMCE.triggerSave(); }, setup: function (editor) { editor.onInit.add(function (editor, event) { if (typeof v2SetInitialContent == 'function') { v2SetInitialContent(); } }) } }); is there anything obvious here? i've got all that complicated removal stuff in the close b/c tinymce doesn't like having it's html removed without it being removed. the setInitialContent() stuff is just so i can pre-load it with their email signature if they have one. it's broken with or without that code so that's not the problem. i was forced to update to 3.4.9 because of this issue: http://www.tinymce.com/forum/viewtopic.php?id=28400 so if someone can solve that, it would help this situation to. I have tried the suggestion from aknosis with no luck. EDIT: I originally thought this only affected firefox 11, but i have downloaded 10, and it is also affected. EDIT: Ok, i've trimmed down all my convoluted dynamic forms and links that cause this into a fairly simple example. the code for the base page: <a href="<%=Url.Action(MVC.Temp.GetRTEDialogContent)%>" id="TestSendEmailDialog">Get Dialog</a> <div id="TestDialog"></div> <script type="text/javascript"> $('#TestSendEmailDialog').click(function (e) { e.preventDefault(); var theDialog = buildADialog('Test', 500, 800, 'TestDialog'); theDialog.dialog('open'); theDialog.empty().load($(this).attr('href'), function () { }); }); function buildADialog(title, height, width, dialogId, maxHeight) { var customDialog = $('#' + dialogId); customDialog.dialog('destory'); customDialog.dialog({ title: title, autoOpen: false, height: height, modal: true, width: width, close: function (ev, ui) { $(this).dialog("destroy"); $(this).empty(); }, beforeClose: function (event, ui) { if (typeof tinyMCE != 'undefined') { $(this).find(':tinymce').each(function () { var theMce = $(this); tinyMCE.execCommand('mceFocus', false, theMce.attr('id')); tinyMCE.execCommand('mceRemoveControl', false, theMce.attr('id')); $(this).remove(); }); } } }); return customDialog; } </script> and the code for the page that is loaded into the dialog: <form id="SendAnEmailForm" name="SendAnEmailForm" enctype="multipart/form-data" method="post"> <textarea cols="50" id="MessageBody" name="MessageBody" rows="10" style="width: 710px; height:200px;"></textarea> </form> <script type="text/javascript"> $(function () { $('#MessageBody').tinymce({ script_url: v2ScriptPaths.TinyMCEPath, mode: "exact", elements: 'MessageBody', theme: "advanced", plugins: "paste, preview", paste_retain_style_properties: "*", theme_advanced_toolbar_location: "top", theme_advanced_buttons1: "bold, italic, underline, strikethrough, separator, justifyleft, justifycenter, justifyright, justifyfull, indent, outdent, separator, undo, redo, separator, numlist, bullist, hr, link, unlink,removeformat", theme_advanced_buttons2: "fontsizeselect, forecolor, backcolor, charmap, pastetext,pasteword,selectall, sub, sup, preview", theme_advanced_buttons3: "", language: 'EN', gecko_spellcheck: true, onchange_callback: function (editor) { tinyMCE.triggerSave(); } }); }); </script> a very interesting thing i noticed, if i move the tinyMCE setup into the load callback, it seems to work. this isn't really a solution though, because when i'm loading dialogs, i don't know in the code ahead of time if it has tinyMCE controls or not!

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  • Resources for Programmatic Rendering of Topology Maps

    - by bn
    Servus, Do you know of any frameworks, APIS, languages, or other resources that are well suited for drawing topology maps that allow a user to interact with objects on the map? I am not constrained by language choice and the program can be web-based, or stand-alone. I thought I would check before rolling my own. My goal is not to draw cartographic maps, but more like this picture: http://www.fineconnection.com/files/images/GraphicalNM.PNG, or if you are familiar with Edward Tufte's books, the data-visualization mechanisms he describes such as a map of a metro or subway. Also, if you have had any experience rendering these types of user interfaces or usage of underlying datastructures, I would be grateful to hear any thoughts you have on the subject, advice, any "gotchas." Thank you very for your time, -bn

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  • Why don't these class attributes register?

    - by slypete
    I have a factory method that generates django form classes like so: def get_indicator_form(indicator, patient): class IndicatorForm(forms.Form): #These don't work! indicator_id = forms.IntegerField(initial=indicator.id, widget=forms.HiddenInput()) patient_id = forms.IntegerField(initial=patient.id, widget=forms.HiddenInput()) def __init__(self, *args, **kwargs): forms.Form.__init__(self, *args, **kwargs) self.indicator = indicator self.patient = patient #These do! setattr(IndicatorForm, 'indicator_id', forms.IntegerField(initial=indicator.id, widget=forms.HiddenInput())) setattr(IndicatorForm, 'patient_id', forms.IntegerField(initial=patient.id, widget=forms.HiddenInput())) for field in indicator.indicatorfield_set.all(): setattr(IndicatorForm, field.name, copy(field.get_field_type())) return type('IndicatorForm', (forms.Form,), dict(IndicatorForm.__dict__)) I'm trying to understand why the top form field declarations don't work, but the setattr method below does work. I'm fairly new to python, so I suspect it's some language feature that I'm misunderstanding. Can you help me understand why the field declarations at the top of the class don't add the fields to the class? In a possibly related note, when these classes are instantiated, instance.media returns nothing even though some fields have widgets with associated media. Thanks, Pete

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  • How do I localize the jQuery DatePicker?

    - by Thomas Eyde
    I really need a localized dropdown calendar. An English calendar doesn't exactly communicate excellence on a Norwegian website ;-) I have experimented with the jQuery DatePicker, their website says it can be localized, however that doesn't seem to work. I am using ASPNET.MVC, and I really want to stick to one javascript library. In this case jQuery. The ajax toolkit calendar would be acceptable, if only it too would display Norwegian names. Update: Awesome! I see I am missing the language files, a not so minor detail :-)

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  • Java Preprocessor in C#

    - by Olaseni
    Say I want to create a sort of Pre-processor for existing java code, so I can get the language specific keywords and objects, and then create routines that convert them to their Csharp equivalents, using Csharp code - what route should this take? I'm thinking of Regular Expressions, but I'm fuzzed. I have a bunch of about a 100 .java files and I need to convert them to csharp code in record time. I have manually done just about five of them and I have serious headaches already. Or are there any tools out there that already do that?

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