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• Opera IME support

  - by Fionn

  Hi, i am currently trying to get Input Mode Editor (IME) support working with a designMode enabled IFrame. The problem here is with Opera it seems I don't get any useful notifications from the IME. It seems I get a single keydown with a keycode of 197 if the first time the IME is used - and nothing else ever again (No keycode 229 messages, no textinput event). With all other browsers keydown events with an keycode of 229 seem to be common if there is something happening in the scope of the IME. And with some goodwill and combination of keyup with keycode 13 and textinput events it seems to be possible to detect the moment the sequence is done. Thanks

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• Prototyping Object in Javascript breaks jQuery?

  - by blesh

  I have added a simple .js to my page that has some pretty mundane common-task sort of functions added to the Object and Array prototypes. Through trial and error I've figured out that adding any function to Object.prototype, no matter it's name or what it does causes javascript errors in jQuery: The culprit? Object.prototype.foo = function() { /*do nothing and break jQuery*/ }; The error I'm getting line 1056 of jquery-1.3.2.js, in the attr:function { } declaration: /*Object doesn't support this property or method*/ name = name.replace(/-([a-z])/ig, function(all, letter) { return letter.toUpperCase(); }); Apparently G.replace is undefined. While it's obvious that there's something I'm just not wrapping my head around with prototyping, I'm failing miserably to figure out what it is. To be clear, I'm not looking for a workaround, I have that handled... what I'm looking for is an answer to 'Why?'. Why does adding a function to Object.prototype break this bit of code?

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• Computational geometry: find where the triangle is after rotation, translation or reflection on a mi

  - by newba

  I have a small contest problem in which is given a set of points, in 2D, that form a triangle. This triangle may be subject to an arbitrary rotation, may be subject to an arbitrary translation (both in the 2D plane) and may be subject to a reflection on a mirror, but its dimensions were kept unchanged. Then, they give me a set of points in the plane, and I have to find 3 points that form my triangle after one or more of those geometric operations. Example: 5 15 8 5 20 10 6 5 17 5 20 20 5 10 5 15 20 15 10 I bet that have to apply some known algorithm, but I don't know which. The most common are: convex hull, sweep plane, triangulation, etc. Can someone give a tip? I don't need the code, only a push, please!

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• Tips on upgrading CVS to git/hg?

  - by meder

  We still use CVS, I use git and hg for my personal use though I'm still a novice at both, but I realize they're much more modern and better, faster, distributed, etc. It's just everyone is so accustomed to CVS that I feel a whole slew of issues could arise if I were to be the one that recommended and actually did the upgrading/porting/transitioning of our current CVS server to git or hg. Has anyone actually done this, recently? Could you offer any insight or tips in terms of influencing people to use git/hg, and just generic tips on the actual updating/transitioning if it were to take place? Are there common issues I should be aware of just in general?

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• Help to translate SQL query to Relational Algebra

  - by Mestika

  Hi everyone, I'm having some difficulties with translating some queries to Relational Algebra. I've a great book about Database Design and here is a chapter about Relational Algebra but I still seem to have some trouble creating the right one: Thoes queries I've most difficuelt with is these: SELECT COUNT( cs.student_id ) AS counter FROM course c, course_student cs WHERE c.id = cs.course_id AND c.course_name = 'Introduction to Database Design' SELECT COUNT( cs.student_id ) FROM Course c INNER JOIN course_student cs ON c.id = cs.course_id WHERE c.course_name = 'Introduction to Database Design' and SELECT COUNT( * ) FROM student JOIN grade ON student.f_name = "Andreas" AND student.l_name = "Pedersen" AND student.id = grade.student_id I know the notation can be a bit hard to paste into HTML forum, but maybe just use some common name or the Greek name. Thanks in advance Mestika

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• Small standalone SQL database similar to access in the old days(ie file database)

  - by Ian

  Hi, I am looking for a easy to use and deploy sql type database i can ship with a desktop application. This will be a small application user's can download from my website. In the vb6 days, access was the common database for small desktop apps, what is my option these days? Looking at SQL CE it seems to have a quite a few limitations such as count(distinct) etc SQL express needs to be installed and running as a service (could i include the SQL express deployments in my deployment so the user doesn't even know its been installed? I assume size would then be an issue) SQL 2005/2008 is not an option due to size and licensing restrictions. I would like to use c#, wpf and entity framework. What would seem to be the best options based on your knowledge and experience? Thanks

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• Where can I find a comprehensive reference for Zen Cart variables and overrides?

  - by Angelina

  Hi everyone, I'm working with Zen Cart for a client and I'm having a bit of trouble finding a practical, concise resource that gives reference to the most common template variables and overrides. This project is fairly superficial so that is all I need - but bonus points if you find something that goes a little bit deeper. Please note that I am looking for something that is 'at a glance', like a reference card. I have already looked at several books on Zen Cart, but most of them are designed for the end user or a sysadmin at most and leave much to be desired.

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• django auth : strange error with authenticate()

  - by Rohit

  I am using authenticate() to authenticating users manually. Using admin interface I can see that there is no 'last_login' attribute for Users Debug traceback is : Environment: Request Method: GET Request URL: https://localhost/login/ Django Version: 1.1.1 Python Version: 2.6.5 Installed Applications: ['django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.admin', 'mobius.polls'] Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware') Traceback: File "/usr/lib/pymodules/python2.6/django/core/handlers/base.py" in get_response 92. response = callback(request, *callback_args, **callback_kwargs) File "/usr/lib/pymodules/python2.6/django/contrib/auth/__init__.py" in login 55. user.last_login = datetime.datetime.now() Exception Type: AttributeError at /login/ Exception Value: 'unicode' object has no attribute 'last_login' I cant figure out, why is there this discrepancy. Any kind of help would be appreciated. Thanks in advance!

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• What does the EC2 command line say when a machine won't start?

  - by OneSolitaryNoob

  When starting an instance on Amazon EC2, how would I detect a failure, for instance, if there's no machine available to fulfill my request? I'm using one of the less-common machine types and am concerned it won't start up, but am having trouble finding out what message to look for to detect this. I'm using the EC2 commandline tools to do this. I know I can look for 'running' when I do ec2-describe-instance to see if the machine is up, but don't know what to look for to see if the startup failed. Thanks!

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• Is there a suggested solution structure for ASP.NET MVC Production Apps

  - by Eoin Campbell

  In general, I don't like to keep code (BaseClasses or DataAccess Code) in the App_Code directory of an ASP.NET Site. I'll usually pull this stuff out into a MySite.BusinessLogic & MySite.DataAccess DLL's respectively. I'm wondering should I be doing the same for ASP.NET MVC. Would it be better to Organise the solution something along the lines of MySite.Common - DLL - (Basic Functionality built on .NET System Dlls) MySite.DAL - DLL - (DataAccessLayer & DBML Files) MySite.Models - DLL - (MVC Models e.g. Repository Classes) MySite.Controllers - DLL (MVC Controllers which use Models) MySite - ASP.NET MVC Site. Or am I missing something... presumably, I'll lose some of the nice (Add View, Go To Controller, context menu items that have been added)

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• Data Structure Behind Amazon S3s Keys (Filtering Data Structure)

  - by dimo414

  I'd like to implement a data structure similar to the lookup functionality of Amazon S3. For those of you who don't know what I'm taking about, Amazon S3 stores all files at the root, but allows you to look up groups of files by common prefixes in their names, therefore replicating the power of a directory tree without the complexity of it. The catch is, both lookup and filter operations are O(1) (or close enough that even on very large buckets - S3's disk equivalents - both operations might as well be O(1))). So in short, I'm looking for a data structure that functions like a hash map, with the added benefit of efficient (at the very least not O(n)) filtering. The best I can come up with is extending HashMap so that it also contains a (sorted) list of contents, and doing a binary search for the range that matches the prefix, and returning that set. This seems slow to me, but I can't think of any other way to do it. Does anyone know either how Amazon does it, or a better way to implement this data structure?

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• Compiling the icu sqlite extension statically linked to icu.

  - by Georg

  I want to compile the icu sqlite extension statically linked to icu. This is what I've tried, maybe the mistake is obvious to you. cd icu/source ./runConfigureIcu Linux --enable-static --with-packaging-format=archive ... make cd ../../icu-sqlite gcc -o libSqliteIcu.so -shared icu.c -I../icu/source/common -I../icu/source/i18n -L ../icu/source/lib -lsicuuc -lsicui18n -lsicudata ... sqlite3 .load "libSqliteIcu.so" Undefined symbol utf8_countTrailBytes Files icu sqlite extension Download icu.c from sqlite.org ICU 4.2.1 Download ICU4C from icu-project.org My Requirements Runs on Linux & Windows Only one file that I have to distribute: libSqliteIcu.so. Any idea what else I can try? Documentation Sqlite ICU extension's readme ICU's readme

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• Audio Conversion C#

  - by Will

  What is the best way to convert various audio formats to PCM? For example: mp3, evrc, ogg vox. Is there a library out there that will allow me to implement this relatively easily? EDIT: I guess my initial question wasn't really what I needed. Most of the libs I have found are file converters. What I need is a block converter, where I pass in a 1Kb block of vox data and it returns its converted PCM block. Of course I’ll have to tell the converter what type of data it is and various pieces of codec information. The solution I am going for is to save and VOIP formats into a common wav format and to play that conformed file in real time. I thought there should be an easy way to do this because all audio is eventually turned into PCM before it is outputted anyways.

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• Spring Webflow in Grails keeping plenty of hibernate sessions open

  - by Pavel P

  Hi, I have an Internet app running on Grails 1.1.2 and it integrates Spring WebFlow mechanism. The problem is that there are some bots ignoring robots.txt and are entering the flow quite often. Because second step of the flow needs some human intelligence, the bot leaves open flow after the first step. This causes a lot of open flows which leades to a lot of abandoned open hibernate sessions. Do you know some common clean-up mechanism for this kind of unattended flows (plus hibernate sessions) in Grails+Spring WebFlow? Thanks, Pavel

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• Is there anyway to make a Rails / Rack application tell the web server to drop the connection

  - by dasil003

  There are many security reasons why one would want to drop an HTTP connection with no response (eg. OWASP's SSL best practices). When these can be detected at the server level then it's no big deal. However, what if you can only detect this condition at the application level? Does Rails, or more generally Rack, have any standard way of telling the server to drop the connection without a response? If not, are there some standard headers to pass in that will accomplish that in common web servers (I'm thinking Nginx or Apache)? Even if there is not a standard header is there a reasonable way to configure that behavior? Is this a fool's errand?

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• “Could not create the file”, “Access is denied” and “Unrecoverable build error” in building setup project in VS 2008

  - by Mister Cook

  When building a setup project I get a message: Error with setup build: Error 27 Could not create the file 'C:\Users\MyName\AppData\Local\Temp\VSI1E1A.tmp' 'Access is denied.' I have tried the following (from http://support.microsoft.com/kb/329214/EN-US) regsvr32 "C:\Program Files (x86)\Common Files\Microsoft Shared\MSI Tools\mergemod.dll" The DLL registers but this does not fix my problem. Also, I tried a Clean build, deleting the temp folder, ran VS2008 as administratror, restart my PC but it occurs every time. I have no anti-virus software running and running on Windows 7 64-bit. This operation worked fine until recently. I have read many other users see this but found no solution. The only half solution I found was to edit setup properties and switch to Package files as Loose uncompressed files. This works but is not ideal as I need a full installer.

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• Effective file permissions tool's api in windows

  - by apoorv020

  Starting from Windows Server 2003, Windows included a new tool which calculates the effective permissions for a user (basically it resolves all groups access and takes care of all "deny" permissions as well). An example in point is that a user A belongs to groups B and C. B has been denied read permissions on a file F, while C has been allowed read and write permissions on the file and I want to calculate the effective permissions user A has on file F. This tool is available on Windows Server 2003,Vista,7 and Server 2008 by right clicking on a file and going to properties - security - advanced - effective permissions. What I need is an API in C# which does the same job. The most common FILE API returns access rules (class FileAccessRules), but there seems to be no direct way to calculate effective permissions from these set of access rules. Note: I do not want to process effective permissions in the code if at all possible, but am ready to do so as a last resort.

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• How to tell if a datareader is open on a connection and close it

  - by Earlz

  Hi, I'm setting up a little thing for connection pooling and on of the more common bugs that we have occur(its always an easy fix, but we just can't remember reader.Close()!) it is when we have a connection that is used by a lot of classes/methods and one method opens a data reader and forgets to close it. This isn't really bad cause a lot of times all you have to do is go into the debugger and go up one level and see the function before it was and check if it had an unclosed data reader. Now, here is the bigger problem. In this connection pool, if a datareader is open, then it's not known until a thread gets a connection and tries to use it and the thing that originally opened the data reader may no longer even be alive. So quite simply, how can you detect if a data reader is open on a connection and is there a way to close the reader without closing the connection?

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• What is the best database for my needs?

  - by Mr. Flibble

  I am currently using MS SQL Server 2008 but I'm not sure it it is the best system for this particular task. I have a single table like so: PK_ptA PK_ptB DateInserted LookupColA LookupColB ... LookupColF DataCol (ntext) A common query is SELECT TOP(1000000) DataCol FROM table WHERE LookupColA=x AND LookupColD=y AND LookupColE=z ORDER BY DateInserted DESC The table has about a billion rows with 5 million inserted per day. My main problem with SQL Server is that it isn't too easy to shard or spread out the datafiles. Also, exporting seems to max out at 1000rows per second (about 1MB/s) which seems very slow. Another problem I have is, with SQL Server, if I want to add a new LookupCol the log file grows enormously requiring a large amount of rarely used free space on tap. Are there any obvious better solutions for this problem?

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• Using OpenSessionInViewInterceptor with Hibernate and JSF 2

  - by sammy

  I'm building an application in Hibernate, Spring and JSF2 using only annotations. How can I take advantage of OpenSessionInViewInterceptor found in Spring to catch any hibernate session that might open within a bean? I'm trying to elegantly solve the common “failed to lazily initialize a collection of role: your.Class.assocation no session or session was closed.” problem when trying to read from a yet uninitialized list of POJOs inside another POJO (A Tag entity retrieved by a DAO that contains a List of Project objects I want to read). I've found this: http://www.paulcodding.com/blog/2008/01/21/using-the-opensessioninviewinterceptor-for-spring-hibernate3/ but failed to make use of it in my environment. Please provide a detailed answer, as the Internet is full of foggy, unhelpful tutorials. I'll also be greatful for an alternative solution, given a step-by-step instruction is provided.

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• How to prevent HTTP 304 in Django test server

  - by Augusto Men

  I have a couple of projects in Django and alternate between one and another every now and then. All of them have a /media/ path, which is served by django.views.static.serve, and they all have a /media/css/base.css file. The problem is, whenever I run one project, the requests to base.css return an HTTP 304 (not modified), probably because the timestamp hasn't changed. But when I run the other project, the same 304 is returned, making the browser use the file cached by the previous project (and therefore, using the wrong stylesheet). Just for the record, here are the middleware classes: MIDDLEWARE_CLASSES = ( 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.middleware.transaction.TransactionMiddleware', ) I always use the default address http://localhost:8000. Is there another solution (other than using different ports - 8001, 8002, etc.)?

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• How do I uncompress data in PHP which was originally compressed using zlib?

  - by Gaurav Arora

  Hello Everyone, I am quite new to Iphone development , so please bear me if I ask some some common questions. In my application I have to transfer data from my Iphone app to a PHP server and for this I have to compress the NSdata in my Iphone app and then pass it on to the PHP server and then Uncompress it in PHP and process the data sent by Iphone in PHP. For compressing the data in Iphone I have used zlib library.Now on PHP side I want to uncompress this data , but I am unable to do so. Can anyone help me in uncompressing this data in PHP. Thanks in Advance. Gaurav Arora

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• Can django's auth_user.username be varchar(75)?

  - by perrierism

  Django's auth_user.username field is 30 characters. That means you can't have auth_user.username store an email address. If you want to have users authenticate based on their email address it would seem you have to do some wonky stuff like writing your own authentication backend which authenticates based on (email, password) instead of (username, password) and furthermore, figuring out what you're going to put in the username field since it is required and it is a primary key. Do you put a hash in there, do you try to put the id in there... bleh! Why should you have to write all this code and consider edge cases simply because username is too small for your (farily common) purposes? Is there anything wrong with running alter table on auth_user to make username be varchar(75) so it can fit an email? What does that break if anything?

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• Best Practices for working with files via c#

  - by user177883

  Application I work on generates several hundreds of files in a 15 minutes period of times. and the back end of the application takes these files and process them (updates database with those values). One problem is database locks. What are the best practices on working with several thousands of files to avoid locking and efficiently processing these files? Would it be more efficient to create a single file and process it? or process single file at a time? What are so common best practices?

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• Advice on HTTPS connections using Ruby on Rails

  - by user502052

  Since I am developing a "secure" OAuth protocol for my RoR3 apps, I need to send protected information over the internet, so I need to use HTTPS connections (SSL/TSL). I read How to Cure Net::HTTP’s Risky Default HTTPS Behavior aticle that mentions the 'always_verify_ssl_certificates' gem, but, since I want to be more "pure" (it means: I do not want to install other gems, but I try to do everything with Ruby on Rails) as possible, I want to do that work without installing new gems. I read about 'open_uri' (it is also mentioned in the linked article: "open_uri is a common exception - it gets things right!") that is from the Ruby OOPL and I think it can do the same work. So, for my needs, is 'open_uri' the best choice (although it is more complicated of 'always_verify_ssl_certificates' gem)? If so, can someone help me using that (with an example, if possible) because I have not found good guides about?

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