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• How to set Height of items in XAML so they always occupy the same proportion of available space in p

  - by aoven

  I have an ItemsControl with the following ItemTemplate: <DataTemplate x:Key="myItemTemplate"> <TextBlock Height="???" Text="{Binding Path=Description}" /> </DataTemplate> My question is, how do I set the Height of the TextBlock in the template so that it automatically assumes ItemsControl.Height div ItemsCount amount of vertical space? When there's only one item, I'd like it to be the full height of container, when there're two, each should be half the size, and so on. If possible, I'd prefer to do this completely in XAML to keep my ViewModel clean of UI logic.

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• Is writing to a socket an arbitrary limitation of the sendfile() syscall?

  - by Sufian

  Prelude sendfile() is an extremely useful syscall for two reasons: First, it's less code than a read()/write() (or recv()/send() if you prefer that jive) loop. Second, it's faster (less syscalls, implementation may copy between devices without buffer, etc...) than the aforementioned methods. Less code. More efficient. Awesome. In UNIX, everything is (mostly) a file. This is the ugly territory from the collision of platonic theory and real-world practice. I understand that sockets are fundamentally different than files residing on some device. I haven't dug through the sources of Linux/*BSD/Darwin/whatever OS implements sendfile() to know why this specific syscall is restricted to writing to sockets (specifically, streaming sockets). I just want to know... Question What is limiting sendfile() from allowing the destination file descriptor to be something besides a socket (like a disk file, or a pipe)?

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• How do I rotate an image in Javascript or CSS

  - by Eric

  I am creating a simple game. I want to use jQUERY to rotate the joints making it move. I am using .animate ( http://api.jquery.com/animate/ ) to animate CSS properties but if it is also possible to use Javscript, I can make my own custom code. More TO-THE-POINT How do I rotate images in CSS or Javascript? I prefer CSS but Javascript is fine too. If it is impossible (which I am pretty sure it is but I am not giving up yet) is there any other possible way to do what i am trying to do without making a bunch of seperate images, each rotated a different way. Or can anyone at least give me an example of a site that does something similar. EDIT: I need 1 CSS property (no -something: rotation(500deg);) that works with FireFox, Safari and Chrome because those are the only browsers I really work with.

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• Copying (or recovering) a .PFX password to another machine?

  - by Adam Robinson

  First things first, I'm aware of all of the finger-wagging potential that this question provides. However, I'm attempting to help out a friend with a project so I haven't been part of the decision making process thus far. I'm attempting to set up a new development machine, but one of the projects is signed with a .PFX key that's password protected and the original developer does not remember the password. The current development machine can open and build the project just fine, so I'm wondering if there is any way either to copy or to recover the saved password that Visual Studio is using on the original box so that the file can be used on the new box. Signing with a new file is obviously an option, but one that we'd prefer to avoid. Does anyone know of a way either to recover or copy the credentials for this file to a new machine?

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• OpenSSL "Seal" in C (or via shell)

  - by chpwn

  I'm working on porting some PHP code to C, that contacts a web API. The issue I've come across is that the PHP code uses the function openssl_seal(), but I can't seem to find any way to do the same thing in C or even via openssl in a call to system(). From the PHP manual on openssl_seal(): int openssl_seal ( string $data , string &$sealed_data , array &$env_keys , array $pub_key_ids ) openssl_seal() seals (encrypts) data by using RC4 with a randomly generated secret key. The key is encrypted with each of the public keys associated with the identifiers in pub_key_ids and each encrypted key is returned in env_keys . This means that one can send sealed data to multiple recipients (provided one has obtained their public keys). Each recipient must receive both the sealed data and the envelope key that was encrypted with the recipient's public key. What would be the best way to implement this? I'd really prefer not to call out to a PHP script every time, for obvious reasons.

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• What is the proper way to resolve Eclipse warning "isn't parameterized"?

  - by Morinar

  I'm trying to clean up some warnings in some old Java code (in Eclipse), and I'm unsure what the proper thing to do is in this case. The block looks more or less like this: Transferable content = getToolkit().getSystemClipboard().getContents( null ); java.util.List clipboardFileList = null; if( content.isDataFlavorSupported( DataFlavor.javaFileListFlavor ) ) { try { clipboardFileList = (java.util.List)content.getTransferData( DataFlavor.javaFileListFlavor); } /* Do other crap, etc. */ } The List generates a warning as it isn't parameterized, however, if I parameterize it with <File>, which I'm pretty sure is what it requires, it complains that it can't convert from Object to List<File>. I could merely suppress the unchecked warning for the function, but would prefer to avoid that if there is a "good" solution. Thoughts?

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• Find all words containing characters in UNIX

  - by fahdshariff

  Given a word W, I want to find all words containing the letters in W from /usr/dict/words. For example, "bat" should return "bat" and "tab" (but not "table"). Here is one solution which involves sorting the input word and matching: word=$1 sortedWord=`echo $word | grep -o . | sort | tr -d '\n'` while read line do sortedLine=`echo $line | grep -o . | sort | tr -d '\n'` if [ "$sortedWord" == "$sortedLine" ] then echo $line fi done < /usr/dict/words Is there a better way? I'd prefer using basic commands (instead of perl/awk etc), but all solutions are welcome! To clarify, I want to find all permutations of the original word. Addition or deletion of characters is not allowed.

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• A way to avoid deriving from the provider classes in mvc authentication

  - by Shymep

  Looking for the best practice for authentication in MVC I unfortunately didn't find the clear answer to my question. Thinking of the problem I tried to imagine some priciples that could be useful in my design. Well, I would like to use a base AccountController class I want to place all the tables such as "Users", Roles, Rights etc into my own database. But I wouldn't like to implement the standard aspnetdb design (which can be easy got by using aspnet_regsql) So the main question is can I do this without deriving abstract classes like MembershipProvider, RoleProvider etc? What I would prefer not to do is implement all the abstract methods from these classes. The second question is still about the best practice for authentication e.g. for the small projects, for the large ones?

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• Rationale behind Python's preferred for syntax

  - by susmits

  What is the rationale behind the advocated use of the for i in xrange(...)-style looping constructs in Python? For simple integer looping, the difference in overheads is substantial. I conducted a simple test using two pieces of code: File idiomatic.py: #!/usr/bin/env python M = 10000 N = 10000 if __name__ == "__main__": x, y = 0, 0 for x in xrange(N): for y in xrange(M): pass File cstyle.py: #!/usr/bin/env python M = 10000 N = 10000 if __name__ == "__main__": x, y = 0, 0 while x < N: while y < M: y += 1 x += 1 Profiling results were as follows: bash-3.1$ time python cstyle.py real 0m0.109s user 0m0.015s sys 0m0.000s bash-3.1$ time python idiomatic.py real 0m4.492s user 0m0.000s sys 0m0.031s I can understand why the Pythonic version is slower -- I imagine it has a lot to do with calling xrange N times, perhaps this could be eliminated if there was a way to rewind a generator. However, with this deal of difference in execution time, why would one prefer to use the Pythonic version?

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• iPhone -- initialization partly by NSKeyedUnarchiver and partly by other means

  - by William Jockusch

  I have an object myObj, which is an instance of a class MyClass. Some of its instance variables always have their initial values passed in by the calling code. Other instance variables will be initialized in one of two ways. For an instanceArray of type NSMutableArray, the possibilities are either instanceArray = [[NSMutableArray alloc]init]; or instanceArray = [someKeyedUnarchiver decodeObjectForKey: kInstanceArrayKey]; The calling code should determine which of the above will be used. Any particular design pattern I should prefer?

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• Best Online Programming Degree? (Masters Level)

  - by Jason

  I am less then a year from graduating with my bachelors in web development, however I would like to continue on with a masters in programming. As far as I can tell, what I want is a masters in software engineering. Sadly my current college only offers more management oriented masters level degrees, and I want something that is programming, not business. Ultimately my goal is to teach online and work freelance on the side. Here's the problem - I am visually impaired, so I do not drive and I prefer to take my classes entirely online. I have heard enough to avoid university of phoenix... and I have heard some good about walden, regis, and penn state's online MSSE programs. I am wondering if anyone here knows of any other good ones, or ones I should avoid. I have heard mixed reviews of Colorado Tech.

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• Persistence provider for Java that supports final fields

  - by naeron84

  I'm very new to Java but I've been developing a habit to use final wherever possible declaring immutability which i think is a good thing. (Consider f#) I've read that JPA does not support final fields. Hibernate, TopLink? I'm not sure about these but i prefer JPA for now. Is that even possible theoretically - let's say through reflection - to modify final fields after creation? My guess would be... NO :) What would be certainly possible for a persistence solution is to support constructors with parameters. At least i see no reason that would make this impossible. Mapping would be a little tricky i guess. This is an alternative solution. Suggestions?

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• Consuming a USB HID device in Windows CE 6.0 using c#

  - by kersny

  I am working on an Embedded Windows CE project and am interested in accessing a USB HID device through one of its USB Host ports. All I really need to read are the raw HID spec packets. On a windows computer, I have a working program using hid.dll, but as far as I have researched, there is no equivalent on CE. I know there is the usbhid.dll, but I'm not sure if it is applicable for this situation. I would prefer not to write a kernel level driver, as I would like to do my coding in c#. Has anyone had experience consuming an HID device on Windows CE?

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• Free downloadable products in Magento

  - by Aaron Newton

  Hello Magento boffins. I am using Magento to build an eBooks site. For the release, we plan to have a number of free downloadable books. We were hoping that it would be possible to use the normal Magento 'catalog' functionality to add categories with products underneath. However, since these are free downloadable products, it doesn't really make sense to send users through the checkout when they try to download. Does anyone know of a way to create a free downloadable product which bypasses the checkout altogether? I have noticed that there is a 'free sample' option for downloadable products, but I would prefer not to use this if I can as I plan to use this field for its intended purpose when I add paid products.

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• Oracle analytic functions for "the atatrbute from the row with the max date"

  - by tpdi

  I'm refactoring a colleague's code, and I have several cases where he's using a cursor to get "the latest row that matches some predicate": His technique is to write the join as a cursor, order it by the date field descending, open the cursor, get the first row, and close the cursor. This requires calling a cursor for each row of the result set that drives this, which is costly for many rows. I'd prefer to be able to join, but what something cheaper than a correlated subquery: select a.id_shared_by_several_rows, a.foo from audit_trail a where a.entry_date = (select max(a.entry_date) from audit_trail b where b.id_shared_by_several_rows = a.id_shared_by_several_rows ); I'm guessing that since this is a common need, there's an Oracle analytic function that does this?

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• multiline perl search and replace (one-liner)

  - by yaya3

  I want to perform the following vim substitution as a one-liner in the terminal with perl. I would prefer to allow for any occurences of white space and/or new lines, rather than explicitly catering for them as I am below. %s/blockDontForget">\n*\s*<p><span><a\(.*\)<\/span>/blockDontForget"><p><a\1/g I've tried this: perl -pi -e 's/blockDontForget"><p><span><a(.*)<\/span>/blockDontForget"><p><a$1/msg' I presume I am misinterpreting the flags. Where am I going wrong? Thanks. EDIT: The above example is to strip the spans out of the following html: <div class="block blockDontForget"> <p><span><a href="../../../foo/bar/x/x.html">Lorem Ipsum</a></span></p> </div>

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• ATL OR C# for windows shell/namespace extenssion?

  - by _Avishay_

  Hi, i have a question, after allot of hours in googling and reading articles, i understood that namespace extenssion in windows is quite tricky (In C++ at least), now i've also seen its possible to do so in C# , but microsft does'nt officaly confirms using .net for namespace extensions... though i have seen very nice commercial Namespace Extenssion framework , but none is free.... so to my question :) , i want to develop my own Namespace Extenssion ,i have C++/C# knwoledge and basic COM/ATL , but if it can be done i prefer c#, so does c# inteop can fully do the work without too many tricks ? or one shall go diving in the ATL to create the neccessary COM objects... and another question , can i program to Windows O/S with C# anything that can be done in C++/ATL/MFC ? thanks!

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• Checking if iframe is ready to be written to

  - by Bilal Aslam

  A 3rd party script on my web page creates an iframe. I need to know when this iframe is ready, so I can manipulate its DOM. I can think of a hacky approach: repeatedly try to modify the iFrame's DOM, and return success when a change we make sticks between two attempts. For this to work, I would prefer a property I can check on the iframe repeatedly. Is there an alternative, cross-browser evented approach to knowing that the iframe is ready? E.g. can we redefine the onLoad function to call into our code (but I don't know if I can do this, since I didn't create the iframe).

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• Multiple join query in eSql

  - by Syma

  Hi guys, This is my first question in stackoverflow but really not the first time to get solution here. I am struggling with multiple join in entity framework 4. I have three tables (Accounts, Users and AccountUsers) that am finding difficult to query. What I want is to get all the users for the provided accountId including the account creator. I can get all the account users with no problem but the hard side for me is getting the account creator since it's not added to AccountUsers table. below is a quick preview how the tables are related. Accounts AccountId UserId (account creator) ...other columns Users UserId ...other columns AccountUsers AccountId UserId I would prefer the query to be esql, but Linq to Entities will do. I trust you guys on stackoverflow, so I know this won't take long to get the 'Answer' mark. Thanks for even reading.

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• Invoke a subclass method of an anonymous class

  - by arjacsoh

  I am trying right now to dig into anonymous classes and one question was just arised I 'd prefer not to refer to much details and to pose my question straightforward: How can I invoke the method sizzle() in the following anonymous class: public class Popcorn { public void pop() { System.out.println("popcorn"); } } class Food { Popcorn p = new Popcorn() { public void sizzle() { System.out.println("anonymous sizzling popcorn"); } public void pop() { System.out.println("anonymous popcorn"); } }; public void popIt() { p.pop(); // OK, Popcorn has a pop() method p.sizzle(); // Not Legal! Popcorn does not have sizzle() } } It is known and definite in polymorphism rules that a refernce of a superclass cannot invoke methods of subclass without downcasting (even if it refers to an object of the given subclass). However in the above case what is the "key" to invoke the sizzle() method?

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• Prototype/Scriptaculous Cycle (Slideshow) Plugin

  - by Salman A

  I've got a bunch of websites that use a few Prototype/Scriptaculous plugins such as lightbox and modalbox, hence include references to these two libraries on various pages. I now need to implement a slideshow on every page, and to follow suit, I need a Prototype cycle or slideshow plugin. The requirements are fairly simple: images should fade-in/out every N seconds four controls: prev, pause, play, next i'd prefer to add images to the slideshow via JavaScript; not by adding too many tags Can any one suggest an existing plugin that can be customized easily and is not bloated like most of the other plugins. Here is a jQuery plugin which provides similar functionality: http://malsup.com/jquery/cycle/lite/

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• How is the Tomcat temp directory location defined?

  - by sdoca

  I am running Tomcat bundled with Liferay5.2.3 and use Eclipse 3.5 (Galileo) as my IDE. I set up my Tomcat server in Eclipse as per this blog entry: http://www.jroller.com/holy/entry/developing_portlets_for_liferay_in. If I start Tomcat via the Eclipse server config, Liferay/Tomcat uses my C:\Documents and Settings\user\Local Settings\Temp\ directory. However, if I start Tomcat directly using the startup.bat script, Liferay/Tomcat uses the Tomcat temp directory. I can't figure out if Eclipse, Liferay or Tomcat is deciding which temp directory to use or how to change it. I would prefer to use the Tomcat temp directory. I have this issue with both the Lifera/Tomcat bundles 5.5 and 6.0 (liferay-portal-tomcat-6.0-5.2.3.zip and liferay-portal-tomcat-5.5-5.2.3.zip). Anybody have any clues?

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• Using Mapped Memory Files in C# to store reference types

  - by Khash

  I need to store a dictionary to a file as fast as possible. Both key and value are objects and not guaranteed to be marked as Serializable. Also I prefer a method faster than serializing thousands of objects. So I looked into Mapped Memory Files support in .NET 4. However, it seems MemoryMappedViewAccessor only allows storage of structs and not reference types. Is there a way of storing the memory used by a reference type of a file and reconstructing the object from that blob of memory (without binary serialization)?

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• mod_wsgi | linux installation error

  - by MMRUser

  I'm getting the following error when I try to install mod_wsgi ./configure checking for apxs2... no checking for apxs... /usr/sbin/apxs checking Apache version... 2.2.3 configure: creating ./config.status config.status: creating Makefile make /usr/sbin/apxs -c -I/usr/local/include/python2.6 -DNDEBUG mod_wsgi.c -L/usr/local/lib -L/usr/local/lib/python2.6/config -lpython2.6 -lpthread -ldl -lutil -lm /apr-1/build/libtool --silent --mode=compile gcc -prefer-pic -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -fno-strict-aliasing -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -pthread -I/usr/include/httpd -I/usr/include/apr-1 -I/usr/include/apr-1 -I/usr/local/include/python2.6 -DNDEBUG -c -o mod_wsgi.lo mod_wsgi.c && touch mod_wsgi.slo sh: /apr-1/build/libtool: No such file or directory apxs:Error: Command failed with rc=8323072 . make: *** [mod_wsgi.la] Error 1 libtool is installed on my system.. mod_wsgi 3.2 *Apache 2.2* *Python 2.6*

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• What's the best general programming book to review basic development concepts?

  - by Charles S.

  I'm looking for for a programming book that reviews basic concepts like implementing linked lists, stacks, queues, hash tables, tree traversals, search algorithms, etc. etc. Basically, I'm looking for a review of everything I learned in college but have forgotten. I prefer something written in the last few years that includes at least a decent amount of code in object-oriented languages. This is to study for job interview questions but I already have the "solving interview questions" books. I'm looking for something with a little more depth and explanation. Any good recommendations?

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