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• When and why will an OS initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?

  - by LeopardSkinPillBoxHat

  I know that the OS will sometimes initialise memory with certain patterns such as 0xCD and 0xDD. What I want to know is when and why this happens. When Is this specific to the compiler used? Do malloc/new and free/delete work in the same way with regard to this? Is it platform specific? Will it occur on other operating systems, such as Linux or VxWorks? Why My understanding is this only occurs in Win32 debug configuration, and it is used to detect memory overruns and to help the compiler catch exceptions. Can you give any practical examples as to how this initialisation is useful? I remember reading something (maybe in Code Complete 2) that it is good to initialise memory to a known pattern when allocating it, and certain patterns will trigger interrupts in Win32 which will result in exceptions showing in the debugger. How portable is this?

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• how to have separate keys per record in mongo_mapper + Rails

  - by Vitaly Kushner

  When I'm adding a record in mongodb I can specify whatever keys I want and it will store it in the db. The problem is that it will remember those keys for the next time I insert another record. so for example if I do the following: Product.create :foo => 123 and then Product.create :bar => 456 I get :foo => nil field in the 2nd record. This is definitely not a limitation of mongodb itself, since if I restart the rails console and create yet another record with different set of columns, it will not add the columns from the 1st 2 records. So it seems like mongomapper remembers all the keys used and inserts them all into all records, even if values are not provided. The question is obviously: how do I disable this crazy attributes explosion? Basically I want only the 'permanent' keys that I specify in the model to be in every record, but all the 'extra' attributes to be specified per record and not to mess the consequent records.

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• FileContentResult and international characters

  - by suzi167

  Hello, I am using a fileContentResult to render a file to the browser. It works well except that it throws an exception when the fileName contains international characters. I remember reading somewhere that this feature does not support international characters but I am sure there mustbe a workaround or a best practice people follow in cases the application needs to upload files in countries other than US. Does anyone know of such a practice?Here is the ActionResult Method public ActionResult GetFile(byte[] value, string fileName) { string fileExtension = Path.GetExtension(fileName); string contentType = GetContentType(fileExtension); //gets the content Type return File(value, contentType, fileName); } THanks in advance Susan

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• how to initialize spring bean from database

  - by wavelet

  hi,i use spring security and my config is in database: <sec:http auto-config="true" entry-point-ref="casProcessingFilterEntryPoint"> <sec:remember-me /> <sec:session-management> <sec:concurrency-control max-sessions="1" error-if-maximum-exceeded="true" /> </sec:session-management> <sec:logout logout-success-url="${host.url}/logout/" /> <sec:custom-filter ref="casAuthenticationFilter" after="CAS_FILTER" /> <sec:custom-filter ref="filterInvocationInterceptor" before="FILTER_SECURITY_INTERCEPTOR" /> </sec:http> like ${host.url} is in database how can i initialize ?

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• How do you keep track of your programming TODOs?

  - by Simucal

  I'm one of those people who can't get anything done without a to-do list. If it isn't on the list it doesn't exist. Notepad Method: When I'm programming I've been keeping notepad open with a list of to-do's for my current project. I'll constantly re-arrange these based off priority and I cross them off and move them to the completed section when I'm finished with that particular task. Code Comments: Some programmers pepper their projects source code with: // TODO: Fix this completely atrocious code before anyone sees it Plus, I know that there are some tools that show you a list of all TODOs in your code as well. Website Task Tracker: Remember The Milk Backpack Manymoon Voo2do Gmail Tasks TeuxDeux TodoDodo Ta-da lists ... and many more What have you found to be the best method of keeping track of your to-do lists for multiple projects? Related Question: What can someone do to get organized around here? Related Question: Getting Organized; the to-do list.

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• Perfect hash in Scala.

  - by Lukasz Lew

  I have some class C: class C (...) { ... } I want to use it to index an efficient map. The most efficient map is an Array. So I add a "global" "static" counter in companion object to give each object unique id: object C { var id_counter = 0 } In primary constructor of C, with each creation of C I want to remember global counter value and increase it. Question 1: How to do it? Now I can use id in C objects as perfect hash to index array. But array does not preserve type information like map would, that a given array is indexed by C's id. Question 2: Is it possible to have it with type safety?

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• Applying css media=print not working with MasterPages after pagebreaks

  - by Claudia

  Hi, I´m using a css media=print file in a Page that is using a MasterPage. I put some pagebreaks like this in certain parts of the html code: <h1 style="page-break-before: always; height: 0px; line-height: 0px;"> This works perfectly in the first page, meaning that the styles are applied correctly, but after the pagebreaks, the css is not working any more. Looking somewhere, the advice was to delete the masterpage, and yeah, it worked, but it is not the best thing to do, ´cause I have to remember changing this page if the masterpage changes. Anyone knows another way to solve this problem using MasterPages?

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• Syntax for combining joins in mysql

  - by UltraVi01

  I seem to remember reading somewhere that there is a way to combine LEFT JOIN statements into a more simple query. I have the following query and was hoping someone could kindly take a look at it. SET @userId = 8; SELECT ug.user_id, COUNT(DISTINCT goal_id) as matches FROM user_goal ug, user u, profile p LEFT JOIN user_block ub ON @userId = ub.blocked_id LEFT JOIN user_block ub2 ON @userId = ub2.blocker_id LEFT JOIN user_user uu ON @userId = uu.user_id LEFT JOIN friend_request fr ON @userId = fr.user_id WHERE ug.user_id = u.id AND u.profile_id = p.id AND (ub.blocker_id IS NULL OR ub.blocker_id != ug.user_id) AND (ub2.blocked_id IS NULL OR ub2.blocked_id != ug.user_id) AND (uu.user_friends_id IS NULL OR uu.user_friends_id != ug.user_id) AND (fr.to_user_id IS NULL OR (fr.to_user_id != ug.user_id)) AND ug.user_id!=@userId AND p.suggestible AND goal_id IN (SELECT iug.goal_id FROM user_goal iug WHERE user_id=@userId) GROUP BY user_id ORDER BY matches DESC LIMIT 4

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• What is faster? Drawing or Compositing?

  - by mystify

  I make extensive use of -drawRect: to do some nice animations. A timer tries to fire 30 times per second with -setNeedsDisplay, but it feels like just 20 times. Also I can't use -setNeedsDisplayInRect: because the animation covers the entire thing. Would it help to take some of those drawing operations out of -drawRect: and move them to a subview? -drawRect has to do less then, but instead the OS will have more work with compositing views. Is there a rule of thumb which one is more worse? I remember from an apple text that they claimed Core Animation doesn't redraw during animation. So is that their secret of speed? Using subviews in animations?

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• Python's urllib2 don't work on some sites

  - by Binny V A

  I found that you can't read from some sites using Python's urllib2(or urllib). An example... urllib2.urlopen("http://www.dafont.com/").read() # Returns '' These sites works when you visit the site. I can even scrap them using PHP(didn't try other languages). I have seen other sites with the same issue - but can't remember the URL at the moment. My questions are... What is the cause of this issue? Any workaround for this issue?

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• Possible to get the line number of the currently executing sproc in SQL Server?

  - by Ian Kemp

  A few years back I worked in a Sybase/Delphi environment, using the BDE to connect to the DB server. We had a little Delphi app that, given the name of a currently executing stored procedure, could tell you what line of that sproc was currently being executed. This was exceptionally useful for debugging sprocs that seemed to be hanging. I'd like to use this functionality in SQL Server, but I can't remember whether it was a Sybase or a BDE feature. Is this functionality available in SQL Server and if so, what command(s) do I need to use to view this information?

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• Rails 3 routing - what's best practice?

  - by Mattias

  Hi guys, I'm trying out Rails, and I've stumbled across an issue with my routing. I have a controller named "Account" (singular), which should handle various settings for the currently logged in user. class AccountController < ApplicationController def index end def settings end def email_settings end end How would I set-up the routes for this in a proper manner? At the moment I have: match 'account(/:action)', :to => 'account', :as => 'account' This however does not automagically produce methods like account_settings_path but only account_path Is there any better practice of doing this? Remember the Account controller doesn't represent a controller for an ActiveModel. If this is in fact the best practice, how would I generate links in my views for the actions? url_to :controller => :account, :action => :email_settings ? Thanks!

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• Using Sessions in WCF Services called from Silverlight

  - by Torbjörn Josefsson

  (Using Visual Studio 2008, and Silverlight 3) -I've really looked around for this one, and now I'm just confused by all the solutions that simply won't work for me. I'm trying to call a WCF service from a Silverlight client, which is no problem, but I can't get the service to handle sessions (I want to remember a few things about the callee between calls) I've gathered that basicHttpBinding is no good for sessions, and I haven't managed to make wsHttpBinding work... what's the matter? I would have thought this was a pretty basic thing people would want in their WCF services, or am I just completely muddle-headed not to see how it can be done?

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• Determine branch of origin from bzr blame

  - by Dave Aaron Smith

  I had a complicated change that affected a bunch of files. I don't remember what bazaar branch I wrote that change in. We have a somewhat complicated merge setup, so the branch I'm in now lumps that change in with a lot of other changes. I'd like to do some very similar work so it would be nice to pull the original diff. I feel like I should be able to use bzr blame. I run this command on one of the files bzr blame --long path/to/file and I find one of the pertinent lines and get something like 1107.6.213 dsmith@satie 20091202 | tinyMCE.init({ Can I use that to figure out what branch and revision the original change came from? What do the 6 and 213 stand for?

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• Word 2010 for writing invoices, starting with XML

  - by TomTom

  Hello, we are doing quite some invoice generation, and so far it is based on some pretty awful word automation that is now in for a review with Word 2010. I would love to move to a XML based format for storing / presenting invoices, only going to a word document in the last stage. This means I can use easily othermeans to present an invoice internally from the XML. We use Word as "last stage" because Word is a lot better than anything else ever discovered for formatting - our invoices have quite some text sometimes, in the invoice item table, and word is smartest with handling page breaks in the "correct" way. Now, here my question: is there any proper way by now to do this with XML easily? I remember Word having (had) in 2007 some XML field mapping mechanism, but it did not handle tables in the XML. Was anything changed? What would be the proposed approach for generating an .docx document (starting with a .dotx templace) for an invoice, if the relevant data is available in XML form?

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• Gnome Desktop Icons Alignment

  - by Gabriel L. Oliveira

  Hi all. It has been a long time since I started to compare the gnome desktop to the windows desktop. But since I began to use linux, I realized that the "gnome way" to align the icons on Desktop is not that nice for me. And comparing to Windows's way, windows is better for me. (remember, for me). I'd like to know if anyone has some tip to make "gnome desktop icon alignment" more like windows do. I tried to reduce the icon's size, did something, but was not that all. So, could anyone tell another tip? I like when I put something on windows desktop, and wherever I put the file, Windows organize the file and put the icon right after the last icon (in a cascade style) (and automatically). Any tips?

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• Reading PGP key information

  - by calccrypto

  can someone show a description of the information of what a pgp looks like if only the descriptions were there but not the actual information? something like (i dont remember if the values are correct): packet-type[4 bits], total length in bytes[16 bits], packet version type [4 bits], creation-time[32 bits], encryption-algorithm[8 bits], ...,etc,etc ive tried to understand rfc4880, but its tedious and confusing. so far, i am think i have extracted the 4 i wrote above, but i cant seem to get the rest of the information out. can anyone help? i know i can just find some pgp program, but the whole point of this is to allow me to learn how those programs work in the first place

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• Why are some VB6 DLLs loaded as mapped files?

  - by Mark Bertenshaw

  Hi - A colleague of mine, whilst trying to figure out the memory useage of our VB6 / C# 2.0 application noticed that a minority of VB6 DLLs have two entries in the SysInternals Process Explorer application. All DLLs have an entry for Mapping = Image, and a specified base address. However, a few also have an entry for Mapping = Data, with a base address of zero, and a much smaller memory useage. I seem to remember something about using mapped memory files to share memory between processes, but we are definitely not doing something as interesting as this. All communication between EXEs is done via COM, and as far as I know, nobody has written a shared memory component. This is not desperate, but I would be very interested in any suggestions as to why some DLLs are loaded as mapped file Thanks, Mark Bertenshaw

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• MSDTC Distributed Transaction Coordinator Enabling

  - by Curtis White

  I've a web server and a separate SQL server. I'm trying to use transaction scope to ensure that SQL queries are completed with my linq queries. I wrap everything with this using (TransactionScope scope = new TransactionScope()) I want to know where I need to install DTC. Do I need to install it on the IIS 7.5 box AND the SQL server? Do I need to unblock some ports? Are there any security risk in doing so? I've setup this up once before but don't remember how. If I can't get access to DTC then is there any other way to ensure a lINQ and sql query is atomic?

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• How do I detect a change of tab page in TabControl prior to SelectedIndexChanged event?

  - by JYelton

  I currently determine what page of a tabcontrol was clicked on via the SelectedIndexChanged event. I would like to detect before the selected index actually changes, for validation purposes. For example, a user clicks a tab page other than the one they are viewing. A dialog is presented if form data is unsaved and asks if it's ok to proceed. If the user clicks no, I'd like to remain on the current tab. Currently I have to remember the previous tab page and switch back to it after an answer of 'no.' I considered MouseDown (and the assorted calculation logic), but I doubt that's the best way. (This is in .NET C# 3.5)

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• Linq to SQL Azure generating Error "Specified cast is not valid."

  - by Rabbi

  B"H I have an application that has been working for months using Linq to SQL connecting to a SQLExpress. I tried migrating it to SQL Azure. I copied the structure and data using the Sync Framework. I viewed the data in SQL Azure using SSMS 2008 R2 and it seams to be exactly what I have in my Sql Server. However when I try to use Linq to SQL against it I get an error "Specified cast is not valid." I seams to be happening any time I get child records. i.e. whenever I fill (the first time I access) an entity set. It seams to be happening after the data returns and when Linq tries to put it into the objects. Remember, the application is working perfectly against sqlexpress, even when accessed across the internet or vpn.

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• slow php command line performance - is this normal or do I have an install problem?

  - by Frank Schwieterman

  I have a simple PHP app that prints 'hello world'. When I run it from the command line it takes 6 seconds. Is this normal? It seems to take 1 seconds before "hello world" prints, then 5 seconds after. I assume this is overhead of the interpreter. I am running PHP version 5.2.12 on Windows Server 2008 R2. Could this be an install issue, or is it typical? I did a manual install of PHP then added whatever components were needed to run Drupal. The only PHP addon I remember adding was MDB2, CGI support is there too. I am used to a Lua project I run from the command line, hundreds of lines of code that will run in under a second. I have some unit tests I run from the command line, and already with just a few they are very slow. I run them from Netbeans and the tests are still very slow.

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• Term for releasing software with time dependant portions still unfinished.

  - by Jeremy French

  I remember a while a go on a SO podcast Jeff was talking about the bounty system and he said that they released the bounty offering code before the bounty awarding code was written as the code would not be needed for a couple of weeks. Is there a standard term for this? Agile can work in this way but it doesn’t have to. I am thinking of suggesting it to a client for something and would like to use the correct terminology along with any information backing it up as a method. Essentially the method is to release code with some functionality incomplete as the time until the incomplete functionality is needed is less that the time it will take to develop.

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• For what purpose does java have a float primitive type?

  - by Roman

  I heard plenty times different claims about float type in java. The most popular issues typicaly regard to converting float value to double and vice versa. I read (rather long time ago and not sure that it's actual now with new JVM) that float gives much worse performance then double. And it's also not recommended to use float in scientific applications which should have certain accuracy. I also remember that when I worked with AWT and Swing I had some problems with using float or double (like using Point2D.Float or Point2D.Double). So, I see only 2 advantages of float over double: it needs only 4 bytes while double needs 8 bytes JMM garantees that assignment operation is atomic with float variables while it's not atomic with double's. Are there any other cases where float is better then double? Do you use float's in your applications? It seems to me that the only valuable reason java has float is backward compatibility.

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• How do you set up your web server & document's html to correctly serve HTML5 documents?

  - by joedevon

  Maybe I'm an idiot but I don't quite get what goes in the header of my HTML to use XHTML w/ HTML5. Is this still good and we just add the HTML5 tags?: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html dir="ltr" lang="eng" xmlns="http://www.w3.org/1999/xhtml"> Or is it <!DOCTYPE html> or what? Then at A List Apart they say: If you do go with XHTML 5, remember that your server must deliver the documents with a MIME type of application/xhtml+xml or text/xml. Please explain to me as if I was stupid :) what that means in a practical sense? "deliver the documents"? Meaning html? What happens to php? What are the steps required to set up your web server this way?

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