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• What the guidelines around filters and querystring parameters in RSS Feeds?

  - by Chris Henry

  I run a site where users can content that is tagged by a special set of tags. While implementing RSS feeds, I was wondering what, if any, rules or guidelines exist for using a querystring to filter what content an RSS feed shows. For example, the feed that shows all content on the site would be: /feed If someone was interested in all the work that was tagged with fashion, the URL would be /feed?tag=fashion

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• DataGridView live display of datatable using virtual mode

  - by Chris

  I have a DataGridView that will display records (log entries) from a database. The amount of records that can exist at a time is very large. I would like to use the virtual mode feature of the DataGridView to display a page of data, and to minimize the amount of data that has to be transferred across a network at a given time. Polling for data is out of the question. There will be several clients running at a time, all of which are on the same network and viewing the records. If they all poll for data, the network will run very slowly. The data is read-only to the user; they won't be able to edit any of it, just view it. I need to know when updates occur in the database, and I need to update the screen with those updates accordingly using virtual mode. If a page of data a user is viewing contains data that has change, he/she will see those updates on that page. If updates were made to data in the database, but not in the data the user is viewing, then not much really changes on the user screen (Maybe just the scroll bar if records were added or removed). My current approach is using SQL server change tracking with the sync framework. Each client has a local SQL Server CE instance and database file that is kept in sync with the main database server. I use the information from the synchronization event to see if any changes were made to the main database and were sync'ed to the client. I need to use the DataGridView virtual mode here because I can't have thousands of records loaded into the DataGridView at once, otherwise memory usage goes through the roof. The main challenge right now is knowing how to use virtual mode to provide a seamless experience to the user by allowing them to scroll up and down through the records, and also have records update on the fly without interfering with the user inappropriately. Has anybody dealt with this issue before, and if so, where I can see how they did it? I've gone through some of the MSDN documentation and examples on virtual mode. So far, I haven't found documentation and/or examples on their site that explains how to do what I am trying to accomplish.

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• Can you modify SQL DB schema in a transaction to know if all changes were applied?

  - by Chris F

  As part of my (new) database version control methodology, I'm writing a "change script" and want the change script to insert a new row into the SchemaChangeLog table if the script is executed successfully, or to reverse changes if any single change in the script fails. Is it possible to do schema changes in a transaction and only if it gets committed to then do the INSERT? For example (psuedo-code, I'm not too good with SQL): SET XACT_ABORT ON BEGIN TRANSACTION PRINT 'Add Col2 to Table1' IF NOT EXIST (SELECT * FROM sys.columns WHERE NAME='Col2' AND object_id=OBJECT_ID('Table1')) BEGIN ALTER TABLE [dbo].[Table1] ADD Col2 int NULL END -- maybe COMMIT here? INSERT INTO SchemaChangeLog VALUES(...) COMMIT TRANSACTION

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• Circular Tally Counter Not Rolling Over

  - by chris ward

  I was practicing my java and was trying to make a simple counter with rollover at max, but for some reason it isn't rolling over. Any advice? public class HandTallyCounter { private int max; private int count; public HandTallyCounter(int max) { this.max = max; count = 0; } public void click() { if (count++ > max) { count = 0; } } public int getCount() { return count; } public void reset() { count = 0; } }

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• template expressions and visual studio 2005 c++

  - by chris

  I'd like to build the olb3d library with my visual studio 2005 compiler but this failes due to template errors. To be more specific, the following expression seem to be a problem: void function(T u[Lattice::d]) On the website of the project is stated that prpably my compiler is not capable of such complicated template expressions - one should use the gcc 3.4.1. My question is now if there is a way to upgrade my vs c++ compiler so it can handle template expressions on the level as the gcc 3.4.1? Maybe it helps if I get a newer version of visual studio? Cheers C.

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• What is the standard way to bundle OSGi dependent libraries?

  - by Chris

  Hi, I have a project that references a number of open source libraries, some new, some not so new. That said, they are all stable and I wish to stick with my chosen versions until I have time to migrate to the newer versions (I tested hsqldb 2.0 yesterday and it contains many api changes). One of the libraries I have wish to embed is Jasper Reports, but as you all surely know, it comes with a mountain of supporting jar files and I have only need a subset of the mountain (known) therefore I am planning to custom bundle all of my dependant libraries. So: Does everyone custom-make their own OSGi bundles for open-source libraries they are using or is there a master source of OSGi versions of common libraries? Also, I was thinking that it would be far simpler for each of my bundles simply to embed their dependent jars within the bundle itself. Is this possible? If I choose to embed the 3rd party foc libraries within a bundle, I assume I will need to produce 2 jar files, one without the embedded libraries (for libraries to be loaded via the classpath via standard classloader), and one osgi version that includes the embedded libraryy, therefore should I choose a bundle name like this <<myprojectname>>-<<subproject>>-osgi-.1.0.0.jar ? If I cannot embed the open source libraries and choose to custom bundle the open source libraries (via bnd), should I choose a unique bundle name to avoid conflict with a possible official bundle? e.g. <<myprojectname>>-<<3rdpartylibname>>-<<3rdpartylibversion>>.jar ? My non-OSGi enabled project currently scans for custom plugins via scanning the META-INF folders in my various plugin jars via Service.providers(...). If I go OSGi, will this mechanism still work?

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• Is 0x9B (155decimal) a special control character? Why is it missing from ascii tables?

  - by Chris

  Hi, I'm working on an embedded system, and i'm having dramas getting it to send a certain chunk of data across the serial port. I narrowed it down and found that if a 0x9B is present in the message, it corrupts the message. So i then look up 0x9b (155) on http://www.asciitable.com/, and it's missing! Isn't that a bizarre coincidence! Any ideas, is this a special character or something?

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• How to declare a variable that spans multiple lines

  - by Chris Wilson

  I'm attempting to initialise a string variable in C++, and the value is so long that it's going to exceed the 80 character per line limit I'm working to, so I'd like to split it to the next line, but I'm not sure how to do that. I know that when splitting the contents of a stream across multiple lines, the syntax goes like cout << "This is a string" << "This is another string"; Is there an equivalent for variable assignment, or do I have to declare multiple variables and concatenate them? Edit: I misspoke when I wrote the initial question. When I say 'next line', I'm just meaning the next line of the script. When it is printed upon execution, I would like it to be on the same line.

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• Amazon Product Advertising API: XXX is not a valid value for BrowseNodeId

  - by Chris

  Hello, I am using the Amazon product Advertising API to fetch the product categories. For US categories it is working. But using browse nodes from different sites I get the following error: "569604 is not a valid value for BrowseNodeId. Please change this value and retry your request." I got the browse-nodes from the following site: http://docs.amazonwebservices.com/AWSECommerceService/latest/DG/index.html?BrowseNodeIDs.html Where is the problem? Thanks for your help!

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• C# Express 2010 Multi-Threading

  - by Chris Evans

  Hi, I have a windows app that I have been running in c# Express 2008 for a year and have been trying to convert it over the last few days to 2010. The problem I am having is it is a multi-threaded application that has to run a series of code every second. What it does is have a main thread, that calls 3 worker threads, waits for them to finish then does some additional processing, sleeps till 1 second and runs again. The problem is part of the code can call a web service that takes 8 seconds to respond, so this bit of code gets called using ThreadPool.QueueUserWorkItem. The problem is when running in 2010 when this part of the code gets called the main thread continues to run but when it awakens the sub threads it hangs until the Threadpool method finishes running. This never happens in 2008. Any suggestions? So far I put that bit of code in it's own thread rather than using Threadpool but same issue.

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• Display image at point using jQuery

  - by Chris

  I have an image with a click event handler that captures the location where you clicked. $("#image").click(function(e) { var x = e.pageX - $(this).offset().left; var y = e.pageY - $(this).offset().top; }); I want it so that when the image is clicked an image appears at that location on top of the image. How do I do this?

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• Creating a Calender in PHP

  - by Chris T

  Are there any APIs/Libraries that make it easy to generate a calender for a certain month/year? I need to have some sort of admin interface for a "event planner" part of a CMS for a local youth group and I'm at a loss as to how to generate a decent calender.

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• facial comparison software

  - by chris beardmore

  I have images of my children we all do, but I have found a picture of a toddler that bears great resemblance to 1 of my own sons on the internet, is there any software available that I can perform side-by-side comparison with, or maybe software that can give an X-% probability match

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• Setting multiple jars in java classpath

  - by Chris Serra

  Is there a way to include all the jar files within a directory in the classpath? I'm trying java -classpath lib/*.jar:. my.package.Program and it is not able to find class files that are certainly in those jars. Do I need to add each jar file to the classpath separately?

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• How can I create an ODBC connection to SAS?

  - by Chris B.

  I'm writing a program that needs to access SAS data. I've downloaded the ODBC drivers for SAS and installed them, but I need to be able to create ODBC connections on the fly, programmatically. The following code (in Python) seems like it should work: import ctypes ODBC_ADD_DSN = 1 def add_dsn(name, driver, **kw): nul, attrib = chr(0), [] kw['DSN'] = name for attr, val in kw.iteritems(): attrib.append('%s=%s' % (attr, val)) return ctypes.windll.ODBCCP32.SQLConfigDataSource(0, ODBC_ADD_DSN, driver, nul.join(attrib)) == 1 print add_dsn('SAS Test', 'SAS', description = 'Testing SAS') But it pops up the SAS ODBC configuration dialog, sets the datasource name, and waits for the user to enter the information and dismiss the dialog. How can I avoid that?

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• How to use Javascript to create a checked radioButton in IE?

  - by Chris

  I was trying to create a checked radiobutton by using following code in IE7. But it doesn't work. var x = document.createElement(""); var spn=document.createElement("span"); spn.appendChild(x); x.checked=true; document.body.appendChild(spn); I found that I could put x.checked=true after appendChild statement to make it work. I also noticed that when I change "radio" to "checkbox", it can be checked without changing the order of statements. I am really confused by these facts. Am I doing something wrong in the above code?

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• LINQ to Entites: How should I handle System.InvalidOperationException when checking for existance of

  - by chris

  I have a many-to-one relationship that users can edit via checkboxes. PK of Foo is ID, and fid contains the id from the checkbox. I'm checking to see if an element exists with: Foo ent; try { ent = ctx.Foo.First(f => f.ID == fid); } catch (System.InvalidOperationException ioe) { ent = new Foo(); } It seems to me that I should be able to do this without throwing an exception. What would be the best way to do this?

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• How do I write raw binary data in Python?

  - by Chris B.

  I've got a Python program that stores and writes data to a file. The data is raw binary data, stored internally as str. I'm writing it out through a utf-8 codec. However, I get UnicodeDecodeError: 'charmap' codec can't decode byte 0x8d in position 25: character maps to <undefined> in the cp1252.py file. This looks to me like Python is trying to interpret the data using the default code page. But it doesn't have a default code page. That's why I'm using str, not unicode. I guess my questions are: How do I represent raw binary data in memory, in Python? When I'm writing raw binary data out through a codec, how do I encode/unencode it?

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• css website looks good in Ie8 and FF, but not in Google Chrome

  - by Chris

  Hi there, The title says it all, my website looks good in Iexplorer 8 and Firefox but the part of the picure and top navigation is laso noty in place, can anyone figur out why? For me it's a mysterie http://www.friesecomputerservice.nl/

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• Cross-Application User Authentication

  - by Chris Lieb

  We have a webapp written in .NET that uses NTLM for SSO. We are writing a new webapp in Java that will tightly integrate with the original application. Unfortunately, Java has no support for performing the server portion of NTLM authentication and the only library that I can find requires too much setup to be allowed by IT. To work around this, I came up with a remote authentication scheme to work across applications and would like your opinions on it. It does not need to be extremely secure, but at the same time not easily be broken. User is authenticated into .NET application using NTLM User clicks link that leaves .NET application .NET application generates random number and stores it in the user table along with the user's full username (domain\username) Insecure token is formed as random number:username Insecure token is run through secure cipher (likely AES-256) using pre-shared key stored within the application to produce a secure token The secure token is passed as part of the query string to the Java application The Java application decrypts the secure key using the same pre-shared key stored within its own code to get the insecure token The random number and username are split apart The username is used to retrieve the user's information from the user table and the stored random number is checked against the one pulled from the insecure token If the numbers match, the username is put into the session for the user and they are now authenticated If the numbers do not match, the user is redirected to the .NET application's home page The random number is removed from the database

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• Cakephp: Extend search capability to hasMany Relationship

  - by Chris

  I have two models: Car hasMany Passengers Passenger belongsTo Car I want to implement a search using Cake Search. The user should input a number and the searchengine should return all cars that have less than this number passengers. In my search form: echo $form->input('passengers', array('label' => 'Passengers', 'div' => false)); In my Car model: public $filterArgs = array( array('name' => 'passengers', 'type' => 'int'), ); In the controller: public $presetVars = array( array('field' => 'passengers', 'type' => 'int') } I thought of adding a function to the model that returns the number of passengers: function countPassengers(){ return(count($this->Car->Passenger)); //Not sure if this works } And how to I implement this search criteria?: return all Cars where countPassengers()<passenger

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• Is there a trace in RAM(Random access memory) of keyboards input?

  - by Chris

  Hi I lost some notes and i have about 40 minutes before my pc will restart. I know it might be imposible but anyway maybe i will learn something. So the question goes: Is there a RAM trace left by keyboard input that could be recovered in 40 minutes or less. I use Win 7 build 7100.

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• jQuery delay doesn't work as expected

  - by Chris

  I have the following jQuery code $("#dropdown").hover(function() { $(this).stop(true,true).fadeTo('fast',1); $("#options").stop(true,true).slideDown(); }, function() { $(this).delay(1000).stop(true,true).fadeTo('fast',0.1); $("#options").delay(1000).stop(true,true).slideUp(); } ); What I expect to happen is when the mouse leaves #dropdown it will wait 1 second before continuing. This is not happening. What I am trying to achieve, in case there is a better way, is to leave the drop down menu visible for a second or two after moving your mouse and I would also like to prevent the events from happening again to prevent artifacts and "funnies" if you were to move the mouse over and out from the div very quickly

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• Creating a calendar in PHP

  - by Chris T

  Are there any APIs or libraries that make it easy to generate a calendar for a certain month/year? I need to have some sort of admin interface for a "event planner" part of a CMS for a local youth group and I'm at a loss as to how to generate a decent calendar. Note: I only need something to generate the calendar HTML, not manage events. I'll be coding that part.

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• Will Visual Studio 2010 support HTML 5?

  - by Chris

  Since Visual Studio 2010 is slated for release in March of 2010 and HTML 5 is now starting to be used even more widely, I would like to know if Visual Studio will ship with HTML 5 templates, standard controls and support for the more common markup? A definition for support of HTML 5 would be that any new version of Visual Studio should have similar support for code-completion, validation and markup that is currently supported for HTML 4.01 and XHTML 1.0 and 1.1. Update From the Visual Web Develolper Team Blog: HTML 5 intellisense and validation schema for Visual Studio 2008 and Visual Web Developer is for downloading. Follow the instructions posted on the page to install the new scheme. Seems like the Visual Studio Team will be supporting HTML 5 after all.

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