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• getline at a certain line for file IO

  - by BSchlinker

  Is there anyway to use getline to read a specific line within a file? For instance, to immediately read line #20? It seems inefficient to do any type of look to read and discard earlier lines. I know about fseek, but there is no guarantee that the records will be the same length on each line. I imagine this is simply what is required in order to find lines. After all, to know when the end of the line has been reached, it needs to find the break line character, so it makes sense for it to need to read each line. Just wondering if there was any quicker method.

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• ruby on rails, searchlogic and refactoring

  - by JohnMerlino

  Hey all, I'mt not too familiar with searchlogic plugin for rails (I did view the railscasts but wasn't helpful in relation to the specific code below). Can anyone briefly describe how it is being used in the three methods below? Thanks for any response. def extract_order @order_by = if params[:order].present? field = params[:order].gsub(".", "_") field = field.starts_with?('-') ? 'descend_by_'+field[1..-1] : 'ascend_by_'+field field.to_sym else # Workaround 'searchlogic'.to_sym end end def find_resources @search_conditions = params[:search_conditions] || {} # See http://www.binarylogic.com/2008/11/30/searchlogic-1-5-7-complex-searching-no-longer-a-problem/ @resources = @resource_model.send(@order_by).searchlogic(:conditions => @search_conditions) end def apply_filters f = filter_by f.each do |filter_field| filter_constraints = params[filter_field.to_sym] if filter_constraints.present? # Apply searchlogic's scope @resources.send(filter_field,filter_constraints) end end end

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• CSS 100% Height, and then Scroll DIV not page

  - by Justin

  Okay so I haven't been able to find a question with an answer yet, so I decided to make my own. I am trying to create a 100% fluid layout, which technically I have done. http://stickystudios.ca/sandbox/stickyplanner/layout/index2.php BUT, what I want it to now do, is make the page 100% in HEIGHT... But I don't want the page to scroll I want the inner DIV to scroll. So I believe in short I want it to detect the height of the viewport screen, go 100%, and then IF content is longer then the screen, scroll the specific DIV, NOT the page. I hope this makes sense. Thanks in advance. Justin

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• Most used .NET namespace

  - by Michael Prewecki

  What is your most commonly used namespace in .NET. I know it will vary greatly based upon the types of projects you develop but the stack overflow audience should provide a fairly decent sample set for the types of .NET projects being developed. I'm simply interest in the name of the namespace (one namespace per answer and no one person should have more than one answer, if someone else has the same answer as you then just upvote their answer). Try to be as specific as possible (so answering System, isn't helpful). I'm after this information to help new developers focus their attention on the most common .NET namespaces...there are after all thousands of them! To start off mine is almost certainly System.Collections.Generic, I use lists of things everywhere.

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• Storing varchar(max) & varbinary(max) together - Problem?

  - by Tony Basallo

  I have an app that will have entries of both varchar(max) and varbinary(max) data types. I was considering putting these both in a separate table, together, even if only one of the two will be used at any given time. The question is whether storing them together has any impact on performance. Considering that they are stored in the heap, I'm thinking that having them together will not be a problem. However, the varchar(max) column will be probably have the text in row table option set. I couldn't find any performance testing or profiling while "googling bing," probably too specific a question? The SQL Server 2008 table looks like this: Id ParentId Version VersionDate StringContent - varchar(max) BinaryContent - varbinary(max) The app will decide which of the two columns to select for when the data is queried. The string column will much used much more frequently than the binary column - will this have any impact on performance?

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• To subclass or not to subclass

  - by poulenc

  I have three objects; Action, Issue and Risk. These all contain a nunber of common variables/attributes (for example: Description, title, Due date, Raised by etc.) and some specific fields (risk has probability). The question is: Should I create 3 separate classes Action, Risk and Issue each containing the repeat fields. Create a parent class "Abstract_Item" containing these fields and operations on them and then have Action, Risk and Issue subclass Abstract_Item. This would adhere to DRY principal.

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• Simple select not working on JDBC MSSQL ?

  - by Xinus

  I am trying to move project which was using MySQL database to the one that uses MSSQL 2008, But the select that was working in mysql is no longer working in MSSQL PreparedStatement statement = connection .prepareStatement("select u.user_firstname,u.user_lastname from user_details u, login l where l.username=? and l.login_user = u.user_id"); statement.setString(1, userName); ResultSet resultSet = (ResultSet) statement.executeQuery(); It always gives me empty resultset even when there are values corresponding to that username, When I run query using MSSQL management studio - query works properly i.e. it gives non-zero rows, Are there any MSSQL specific change I need to do ?

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• Hashes vs Numeric id's

  - by Karan Bhangui

  When creating a web application that some how displays the display of a unique identifier for a recurring entity (videos on YouTube, or book section on a site like mine), would it be better to use a uniform length identifier like a hash or the unique key of the item in the database (1, 2, 3, etc). Besides revealing a little, what I think is immaterial, information about the internals of your app, why would using a hash be better than just using the unique id? In short: Which is better to use as a publicly displayed unique identifier - a hash value, or a unique key from the database? Edit: I'm opening up this question again because Dmitriy brought up the good point of not tying down the naming to db specific property. Will this sort of tie down prevent me from optimizing/normalizing the database in the future? The platform uses php/python with ISAM /w MySQL.

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• Writing JSON with XSLT

  - by JP

  Hi, I'm trying to write XSLT to transform a specific web page to JSON. The following code demonstrates how Ruby would do this conversion, but the XSLT doesn't generate valid JSON (there's one too many commas inside the array) - anyone know how to write XSLT to generate valid JSON? require 'rubygems' require 'nokogiri' require 'open-uri' doc = Nokogiri::HTML(open('http://bbc.co.uk/radio1/playlist')) xslt = Nokogiri::XSLT(DATA.read) puts out = xslt.transform(doc) # Now follows the XSLT __END__ <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml"> <xsl:output method="text" encoding="UTF-8" media-type="text/plain"/> <xsl:template match="/"> [ <xsl:for-each select="//*[@id='playlist_a']//div[@class='artists_and_songs']//ul[@class='clearme']"> {'artist':'<xsl:value-of select="li[@class='artist']" />','track':'<xsl:value-of select="li[@class='song']" />'}, </xsl:for-each> ] </xsl:template> </xsl:stylesheet>

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• What's your favorite vim color scheme?

  - by Nathan Long

  Wwhat is your favorite vim color scheme? I haven't found a great one yet, but what I'd like, in order of priority, are: Never confuses me. For example: When matching braces are highlighted, it's easy to see where the cursor is When I've got two or more tabs open, I can read all the titles and easily tell which one is active (maybe inactive ones look faded out) Very readable, both for regular code and for highlighting It would be nice if it was attractive I found one scheme that was ALMOST perfect (peaksea), but not quite - I couldn't read the titles of non-active tabs. So on a related note: anybody know a clear reference page for tweaking the colors of specific items?

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• Configure Active Relying Party STS to Trust Multiple Identity Provider STSes

  - by CodeChef

  I am struggling with the configuration for the scenario below. I have a custom WCF/WIF STS (RP-STS) that provides security tokens to my WCF services RP-STS is an "Active" STS RP-STS acts as a claims transformation STS RP-STS trusts tokens from many customer-specific identity provider STSes (IdP-STS) When a WCF Client connects to a service it should authenticate with it's local IdP-STS The reading that I've done describes this as Home Realm Discovery. HRD is usually described within the context of web applications and Passive STSes. My questions is, for my situation, does the logic for choosing an IdP-STS endpoint belong in the RP-STS or the WCF Client application? I thought it belonged in the RP-STS, but I cannot figure out the configuration to make this happen. RP-STS has a single endpoint, but I cannot figure out how to add more than one trusted issuer per endpoint. Any guidance on this would be very appreciated (I'm out of useful keywords to Google.) Also, if I'm way off please offer alternative approaches. Thanks!

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• AJAX vs AHAH Is there a performance advantage?

  - by LanguaFlash

  My concern is performance, is there a reason to to send the client XML instead of valid HTML? Like most things, I am sure it is application dependent. My specific situation is where there is substantial content being inserted into the web page that has been pulled from a database. What are the advantages of either approach? Is the size of the content even a concern? Or, in the case of using XML, will the time for the Javascript to process the XML into HTML counterbalance the extra time that would have been required to send HTML to start with? Thanks, Jeff

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• How do I specify table data only for the current user's ID (VWD asp.net 3.5) ?

  - by Greg McNulty

  I'm using the Details View control of VWD asp.net 2008 I have a users database table and one of the columns contain the "unique" user's profile ID, created by VWD from the automatic profiles table. From my table, I would like to select only the data pertaining to the logged in user. How do I get the current unique user profileID and then have that used for the query? What I have so far: In the configure data source option of the control I select the columns I would like to display, select the check box for "Return Only Unique IDs" and the WHERE option. In this new window I select the Column to the profile userID ... "=" and then assumed I should select Source: "Profile". Now what should the parameter properties or value be to select only the logged userID specific data of the table? Any help is appreciated. Thank You!

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• How does Windows decide which icon format to display when showing an exe's icon in Windows Explorer?

  - by Malcolm

  How does Windows decide which icon format to display when showing an exe's icon in Windows Explorer? Problem: When we look at our icon file and exe with embedded icon file in various Windows Explorer file views, the icon file is displayed in a higher quality mode than the icon displayed for our executable even though the icon in our executable contains the exact same icon. Our exe's icon has jaggier edges which leads me to believe that Windows Explorer may be trying to upsize a lower resolution icon rather than picking an icon appropriate for the actual display size. In a multi-format icon file, is there a specific order we should use for positioning each icon format? For example, we have an icon file with icons in the following formats: - 16x16 - 32x32 - 48x48 - 64x64 - 128x128 - 256x256 We are testing the appearance of our exe's icon using Windows Explorer under Windows XP, Vista and Windows 7. Any suggestions appreciated.

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• Efficiently check string for one of several hundred possible suffixes

  - by Ghostrider

  I need to write a C/C++ function that would quickly check if string ends with one of ~1000 predefined suffixes. Specifically the string is a hostname and I need to check if it belongs to one of several hundred predefined second-level domains. This function will be called a lot so it needs to be written as efficiently as possible. Bitwise hacks etc anything goes as long as it turns out fast. Set of suffixes is predetermined at compile-time and doesn't change. I am thinking of either implementing a variation of Rabin-Karp or write a tool that would generate a function with nested ifs and switches that would be custom tailored to specific set of suffixes. Since the application in question is 64-bit to speed up comparisons I could store suffixes of up to 8 bytes in length as const sorted array and do binary search within it. Are there any other reasonable options?

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• Best practices for managing limited client licenses/login

  - by MicSim

  I have a multi-user software solution (containing different applications, i.e. EXEs) that should allow only a limited number of concurrent users. It's designed to run in an intranet. I dont have a really good, satisfactory solution to the problem of counting the client licenses yet. The key requirements are: Multiple instances (starts) of the same application (= process) should count as only one client licence Starting different applications of the software solution should also count as only one (the same) client licence Application crash should not lead to orphaned used licences The above should work also for Terminal Server environments (all clients same IP, but different install folders) I'm looking for estabilished patterns, solutions, tips for managing used client licenses. Specific hints for the above sitaution are also welcome.

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• Is there an extensible SQL like query language that is safe for exposing via a public API?

  - by Lokkju

  I want to expose some spatial (and a few non-spatial) datasets via a public API. The backend store will either be PostgreSQL/PostGIS, sqlite/spatialite, or CouchDB/GeoCouch. My goal is to find a some, preferably standard, way to allow people to make complex spatial queries against the data. I would like it to be a simple GET based request. The idea is to allow safe SQL type queries, without allowing unsafe ones. I would rather modify something that is off the shelf than doing the entire thing myself. I specifically want to support requesting specific fields from a table; joining results; and spatial functions that are already implemented by the underlying datastore. Ideas anyone?

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• Best practices for file system dependencies in unit/integration tests

  - by Olvagor

  I just started writing tests for a lot of code. There's a bunch of classes with dependencies to the file system, that is they read CSV files, read/write configuration files and so on. Currently the test files are stored in the test directory of the project (it's a Maven2 project) but for several reasons this directory doesn't always exist, so the tests fail. Do you know best practices for coping with file system dependencies in unit/integration tests? Edit: I'm not searching an answer for that specific problem I described above. That was just an example. I'd prefer general recommendations how to handle dependencies to the file system/databases etc.

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• Stress Test tool for Password Protected Website

  - by Jason

  We need to run a stress test on a password protection section of a website we host. What tool (paid or free) would be best for us to use for this? We'd like to be able to create several 'scripts' and then have the stress test simulate X number of users. Each script will have us login as a specific user and then click on some links and submit forms to simulate an actual user. Ideally the software would also create some nice data exports/charts. Server is a linux web server, but we could run this on linux or Windows so software that will run on either is fine.

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• EJB3 with Spring

  - by fish

  I have understood that if I use EJB in Spring context, I get all the same benefits as if I was using it in "pure" EJB3 environment, is this true? I have googled but can't find a definitive, clear answer. For example, let's say I have a session bean that updates some tables in the database and it throws a System Exception. In "pure" EJB3 environment the transaction is rolled back. What if I for example @Autowire this bean using Spring, does Spring take care of the transaction handling same way as does the EJB3 container? Or what? Does it maybe require some specific configuration or is it fully "automatic"?

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• Detecting rotation to landscape manually

  - by Thomas Joos

  hi all, I am working on an iPhone application based on UITabBarController and UIViewControllers for each page. The app needs to run in portrait mode only, so every view controller + app delegate goes with this line of code: (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } There is one view controller where I would like to pop up a UIImageView when the iPhone is rotaed to landscapeleft. The design of the image looks landscape, although the width and height are 320x460 ( so its portrait ). How can/should I detect this type of rotation manually, just in this specific view controller, withouth having an auto rotation on the entire view? Thomas UPDATE: Thanks! I added this listener in the viewDidLoad: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:)name:UIDeviceOrientationDidChangeNotification object:nil]; the didRotate looks like this: (void) didRotate:(NSNotification *)notification { UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; if (orientation == UIDeviceOrientationLandscapeLeft) { //your code here } }

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• how big should your controllers be in asp.net-mvc

  - by ooo

  i see the new feature of areas in asp.net-mvc 2. it got me thinking. why would i need this? i did some reading on the use cases and it came down to a specific point to me around how big and how broad scope should my controllers should be? should i try to have many little controllers? one big controller? how do people determine the sweet spot for number of controllers? i think mine are maybe too large (which had me questioning areas in the first place as maybe my controller name should really be an area and have a number of smaller controllers)

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• Visual Studio msbuild

  - by user62958

  I have a question regarding the commandline options of msbuild. I am currently using msbuild to build projects using the existing solution files. These solution files have references to external dll which have different paths on each machine. I am currently writing a build script and passing the specific path to the project file via the /p: switch of msbuild. My current build line is: msbuild test.sln /p:ReferencePath="c:\abc" /p:ReferencePath="c:\rca" What i have noticed that Reference Path now contains only c:\rca and not c:\abc. this is causing problems for me since, the external dlls lie in two different directorys. I am allowed to keep multiple reference paths via visual studio, but not via the commandline. Is there any known way by which i can do this

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• Handling update errors in multiple records in the TClientDataset's ReconcileError method

  - by Fabio Gomes

  I'm trying to use the ReconcileError event to allow the user to correct the data after an update error which occurred in a specific record among others. Example: I have a dataset with one field and 3 records, this field have a unique constraint on the database, then I change one value to conflict when it reaches the database, then I call ApplyUpdates on the Dataset. This will generate an error (violation of unique constraint) in the provider and abort the applyupdates process, returning raAbort in the Action var of the ReconcileError method. In the ReconcileError method I tryied to use: Action := HandleReconcileError(aDataSet, UpdateKind, E); ** EDIT ** After debugging and dumping the DataSet records which were returned from the server, I noticed that there are 2 records in this Dataset, the first is the Old record and the second have all the changes I made to the first record. I'm a bit confused, will I always get this DataSet with 2 records? I thought that it should have only one record with the Old/New values. Thanks.

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• NUnit vs Visual Studio 2010's MSTest?

  - by David White

  I realise that there are many older questions addressing the general question of NUnit v MSTest for versions of Visual Studio up to 2008 (such as this one). Microsoft have a history of getting things right in their 3rd version. For MSTest, that is VS2010. Have they done so with MSTest? Would you use it in a new project in preference to NUnit? My specific concerns: speed running tests within CruiseControl.NET (either commandline or MSBuild task) code coverage reports from CC.NET can you run MSTest tests in debug mode (We use ReSharper, so test-runners are not an issue for us. We have used NUnit for the last few years. We do not have TFS.)

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