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• XNA Notes 010

  - by George Clingerman

  With GDC 2011 wrapping up there were a LOT of great interviews and posts with and about XNA and XBLIG and some of our more notorious developers. Definitely worth spending many, many hours watching, listening and reading all those. Very inspiring! Also, don’t forget to get signed up for Dream Build Play! And just as an early warning reminder do NOT, I repeat do NOT wait to submit your game the last day. There are major issues submitting the last day every year and you do not want all your hard work to be hanging on whether your entry actually went through in that last day. Plan on submitting a few days if not a week before. I’m serious, you’ll thank yourself later! Now on to what’s happening in the XNA community! Time Critical XNA News: PAX East Meet Up (really wish I was going!) http://forums.create.msdn.com/forums/p/71921/439262.aspx Want to stay panicked about the countdown to Dream Build Play? Mike McLaughlin shares his DBP countdown clock http://twitter.com/#!/mikebmcl/status/44454458960252928 XNA Team: Nick Gravelyn Only needs less than 600 new users in his unique marketing plan for Pixel Man 2 http://nickgravelyn.com/pixelman2/ And hares his ad revenue numbers with his XNA WP7 games http://theoneswiththelight.com/2011/my-results-with-ad-revenue-for-wp7-games/ XNA MVPs: Andy “The ZMan” Dunn posts his 15,000th App Hub forum post and shares a few thoughts on the MVP summit http://forums.create.msdn.com/forums/t/77625.aspx Chris Williams shares his thoughts on the MVP summit http://geekswithblogs.net/cwilliams/archive/2011/03/07/144229.aspx XNA Developers: Nathan Fouts of Mommy’s Best games Wraps up GDC http://mommysbest.blogspot.com/2011/03/gdc-2011-wrapped.html And shares the wonderful screenshots from Serious Sam. (I’m so jealous people at PAX East willl be playing a demo of this game!) http://mommysbest.blogspot.com/2011/03/serious-sam-double-d.html James Silva of Ska Studios announces http://www.ska-studios.com/2011/03/09/vampire-smile-at-hotel-sierra/ http://www.ska-studios.com/2011/03/08/vengeance-begins-april-6th/ http://www.ska-studios.com/2011/03/04/good-morning-gato-52/ Michael McLaughlin writes an extremely useful set of tips for XNA WP7 developers http://geekswithblogs.net/mikebmcl/archive/2011/03/10/tips-for-xna-wp7-developers.aspx Robert Boyd “the one man XBLIG improving machine” posts his 9 tips for marketing an Xbox LIVE Indie Gam http://www.gamasutra.com/blogs/RobertBoyd/20110309/7183/9_Tips_for_XBLIG_Marketing.php http://forums.create.msdn.com/forums/p/77534/470586.aspx#470586 And shares his day by day experience at GDC this year http://www.gamasutra.com/blogs/RobertBoyd/20110301/7118/GDC_Saves_the_World__Impressions_Day_1.php http://www.gamasutra.com/blogs/RobertBoyd/20110301/7123/GDC_Saves_the_World__Impressions_Day_2.php http://www.gamasutra.com/blogs/RobertBoyd/20110303/7129/GDC_Saves_the_World__Impressions_Day_3.php http://www.gamasutra.com/blogs/RobertBoyd/20110307/7133/GDC_Saves_the_World__Impressions_Day_4.php http://www.gamasutra.com/blogs/RobertBoyd/20110307/7160/GDC_Saves_the_World__Impressions_Day_5.php Phillipe Da Silva releases new IGF Pong Sample preview http://www.vimeo.com/20904070 Xbox LIVE Indie Games (XBLIG): Gamergeddon posts XBox Indie Game Roundup for March 6th http://www.gamergeddon.com/2011/03/06/xbox-indie-game-round-up-march-6th/ Dealspwn interviews FortressCraft developer Projector Games http://www.dealspwn.com/fortresscraft-developer-interview-minecraft-clones-venting-haters-part-1/ http://www.dealspwn.com/fortresscraft-developer-interview-part-2-trials-tribulations-indie-development/ Writings of Mass Destruction continues the Xbox LIVE Indie Game a day campaign, here’s his take on FishCraft (be sure to check out his other posts!) http://writingsofmassdeduction.com/2011/03/05/day-116-fishcraft/ Tom Ogburn shares his GDC notes on the XBLIG panel jotted quickly while attending the panel http://twitter.com/#!/TOgburn/status/44454191028125696 http://www.starlitskygames.com/blogs/site_news/archive/2011/03/06/802.aspx Dave Voyles of Armless Octopus has crazy good coverage on XNA and Xbox LIVE Indie Game developers at GDC 2011. Interviews and articles all extremely well done! http://www.armlessoctopus.com/2011/03/06/gdc-2011-successful-indie-developers-share-insight-on-microsofts-self-publishing-service/ There’s honestly so many posts and interviews you should just hit his front page and scroll down through all of the latest ones. http://www.armlessoctopus.com/ GameMarx Episode 12 http://www.gamemarx.com/video/the-show/27/ep-12-march-4-2011.aspx B.U.T.T.O.N now on Steam! http://www.gamesetwatch.com/2011/03/button_party_game_now_on_steam.php German Xbox Dashboard gets review program from GamePro http://www.armlessoctopus.com/2011/03/07/gamepo-indie-review-show-debuts-on-german-xbox-dashboard/ XboxIndies.com (one of the best XNA sites out there at this point!) continues to add review sites to it’s main review feed. (And don’t forget to play with that awesome XBLIG pivot control!) http://xboxindies.com/ Kris Steele of FunInfused Games shares early footage of his game World of Chalk http://twitter.com/#!/kriswd40/status/45007114371989504 Raymond Matthews of Darkstarmatryx reviews FunInfused Games Abduction Action http://www.darkstarmatryx.com/?p=264 TheVideoGamerRob reviews Zombie Football Carnage http://videogamerrob.wordpress.com/2011/03/08/xblig-review-zombie-football-carnage/ XBLIG Square Off Making the Jump to WP7 http://www.wp7connect.com/2011/03/08/xblig-square-off-will-make-the-jump-to-windows-phone/ Mommy’s Best Games making the news round with their Serious Sam announcement http://www.joystiq.com/2011/03/09/serious-sam-gets-serious-indie-cred-with-new-indie-series/ Most quoted and linked XBLIG article of the week with the least amount of actual facts and reporting. Shared only because it makes me sad that this is the best coverage we get. (Hey reporters, there’s LOT and LOTS of XBLIG and XNA experts you can contact if you need to check up on facts or wonder why on questions like, Why can’t XBLIGs have Nazis? There’s actually a real answer for that..) http://www.joystiq.com/2011/03/06/xblig-facts-nazi-killing-a-no-no-revenue-a-yes-yes/ XNA Development: Mort8088 has been in an XNA tutorial writing frenzy releasing 4 XNA 4.0 entry level tutorials this week! http://mort8088.com/2011/03/06/xna-4-0-tutorial-0-intro/ http://mort8088.com/2011/03/06/xna-4-0-tutorial-1-fonts/ http://mort8088.com/2011/03/06/xna-4-0-tutorial-2-sprites/ http://mort8088.com/2011/03/06/xna-4-0-tutorial-3-input-from-keyboard/ Interesting discussion on what it means to be a community (you do have to sign up to be a member of the XNA UK forums to read it...) http://twitter.com/#!/XNAUK/status/44705269254594560 Slyprid continues his incredible pace on Transmute and shares screens of his new Animation Builder http://twitter.com/#!/slyprid/status/45169271847911424 http://forgottenstarstudios.com/blog/ Philippe Da Silva wants to know who is using IGF for their games. If it’s you, drop him a note letting him know! http://twitter.com/#!/philippedasilva/status/44325893719588864 New Sunburn Video Tutorials released http://www.synapsegaming.com/blogs/fivesidedbarrel/archive/2011/03/07/new-documentation-video-tutorials.aspx Loading and rendering animated collada models using XNA 4.0 http://bunkernetz.wordpress.com/2011/03/09/loading-and-rendering-animated-collada-models-using-xna-4-0/ XNA for Silverlight Developers Part 6 Accelerometer Input http://buzzgamesnews.blogspot.com/2011/03/xna-for-silverlight-developers-part-6.html

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• Sparse matrices / arrays in Java

  - by DanM

  I'm working on a project, written in Java, which requires that I build a very large 2-D sparse array. Very sparse, if that makes a difference. Anyway: the most crucial aspect for this application is efficency in terms of time (assume loads of memory, though not nearly so unlimited as to allow me to use a standard 2-D array -- the key range is in the billions in both dimensions). Out of the kajillion cells in the array, there will be several hundred thousand cells which contain an object. I need to be able to modify cell contents VERY quickly. Anyway: Does anyone know a particularly good library for this purpose? It would have to be Berkeley, LGPL or similar license (no GPL, as the product can't be entirely open-sourced). Or if there's just a very simple way to make a homebrew sparse array object, that'd be fine too. I'm considering MTJ, but haven't heard any opinions on its quality. Thanks!! -Dan

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• Using Knockout.js to bind bootstrap daterange picker and parse span contents

  - by jmkr

  I'm new to knockout and trying to get what should be a simple task up and running. I'm working on an MVC4 .NET app with the intention of binding a date range picker to make ajax requests for updating Highchart graph data. I'm using Dan Grossman's bootstrap-themed date picker and it's been great so far (https://github.com/dangrossman/bootstrap-daterangepicker). The basic goal is to watch the span that this jQuery date ranger picker updates, and then use knockout to pass this value to another part of the app for the ajax request. I've tried everything I can find online.. valueUpdate:change on the span to using some jQuery within knockout to get the same goal done, to using a subscribe function to watch the value of the span before and after the date picker is used. Apparently this uses the jQuery .change() event handler, which is only good on inputs, selects, and textareas.. not spans. Here's the fiddle of what I have so far: http://jsfiddle.net/eyygK/9/ Appreciate any help and input.

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• php imap_search SINCE date problem

  - by Daniel

  Hey I'm trying to show only the emails received in the last 5 min for example $since = date('d-M-Y G\:i', time() - 300); // actual time - 5 min $mb=imap_search ($m_mail, 'UNSEEN SINCE ' . $since . ''); Is there an easy way to do this ? I find a way: take all the unseen mails for the curent day(ex:9 may 2010), loop it and for then checking if it was send in the last X minutes echo it( using the imap_headerinfo-udate )BUT when i looked at gmail.com one email was recevied at 17:08 and on my server appears that the email was received at 14:08 Dan

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• DHCPv6: Provide IPv6 information in your local network

  Even though IPv6 might not be that important within your local network it might be good to get yourself into shape, and be able to provide some details of your infrastructure automatically to your network clients. This is the second article in a series on IPv6 configuration: Configure IPv6 on your Linux system DHCPv6: Provide IPv6 information in your local network Enabling DNS for IPv6 infrastructure Accessing your web server via IPv6 Piece of advice: This is based on my findings on the internet while reading other people's helpful articles and going through a couple of man-pages on my local system. IPv6 addresses for everyone (in your network) Okay, after setting up the configuration of your local system, it might be interesting to enable all your machines in your network to use IPv6. There are two options to solve this kind of requirement... Either you're busy like a bee and you go around to configure each and every system manually, or you're more the lazy and effective type of network administrator and you prefer to work with Dynamic Host Configuration Protocol (DHCP). Obviously, I'm of the second type. Enabling dynamic IPv6 address assignments can be done with a new or an existing instance of a DHCPd. In case of Ubuntu-based installation this might be isc-dhcp-server. The isc-dhcp-server allows address pooling for IP and IPv6 within the same package, you just have to run to independent daemons for each protocol version. First, check whether isc-dhcp-server is already installed and maybe running your machine like so: $ service isc-dhcp-server6 status In case, that the service is unknown, you have to install it like so: $ sudo apt-get install isc-dhcp-server Please bear in mind that there is no designated installation package for IPv6. Okay, next you have to create a separate configuration file for IPv6 address pooling and network parameters called /etc/dhcp/dhcpd6.conf. This file is not automatically provided by the package, compared to IPv4. Again, use your favourite editor and put the following lines: $ sudo nano /etc/dhcp/dhcpd6.conf authoritative;default-lease-time 14400; max-lease-time 86400;log-facility local7;subnet6 2001:db8:bad:a55::/64 {    option dhcp6.name-servers 2001:4860:4860::8888, 2001:4860:4860::8844;    option dhcp6.domain-search "ios.mu";    range6 2001:db8:bad:a55::100 2001:db8:bad:a55::199;    range6 2001:db8:bad:a55::/64 temporary;} Next, save the file and start the daemon as a foreground process to see whether it is going to listen to requests or not, like so: $ sudo /usr/sbin/dhcpd -6 -d -cf /etc/dhcp/dhcpd6.conf eth0 The parameters are explained quickly as -6 we want to run as a DHCPv6 server, -d we are sending log messages to the standard error descriptor (so you should monitor your /var/log/syslog file, too), and we explicitely want to use our newly created configuration file (-cf). You might also use the command switch -t to test the configuration file prior to running the server. In my case, I ended up with a couple of complaints by the server, especially reporting that the necessary lease file wouldn't exist. So, ensure that the lease file for your IPv6 address assignments is present: $ sudo touch /var/lib/dhcp/dhcpd6.leases$ sudo chown dhcpd:dhcpd /var/lib/dhcp/dhcpd6.leases Now, you should be good to go. Stop your foreground process and try to run the DHCPv6 server as a service on your system: $ sudo service isc-dhcp-server6 startisc-dhcp-server6 start/running, process 15883 Check your log file /var/log/syslog for any kind of problems. Refer to the man-pages of isc-dhcp-server and you might check out Chapter 22.6 of Peter Bieringer's IPv6 Howto. The instructions regarding DHCPv6 on the Ubuntu Wiki are not as complete as expected and it might not be as helpful as this article or Peter's HOWTO. But see for yourself. Does the client get an IPv6 address? Running a DHCPv6 server on your local network surely comes in handy but it has to work properly. The following paragraphs describe briefly how to check the IPv6 configuration of your clients, Linux - ifconfig or ip command First, you have enable IPv6 on your Linux by specifying the necessary directives in the /etc/network/interfaces file, like so: $ sudo nano /etc/network/interfaces iface eth1 inet6 dhcp Note: Your network device might be eth0 - please don't just copy my configuration lines. Then, either restart your network subsystem, or enable the device manually using the dhclient command with IPv6 switch, like so: $ sudo dhclient -6 You would either use the ifconfig or (if installed) the ip command to check the configuration of your network device like so: $ sudo ifconfig eth1eth1      Link encap:Ethernet  HWaddr 00:1d:09:5d:8d:98            inet addr:192.168.160.147  Bcast:192.168.160.255  Mask:255.255.255.0          inet6 addr: 2001:db8:bad:a55::193/64 Scope:Global          inet6 addr: fe80::21d:9ff:fe5d:8d98/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 Looks good, the client has an IPv6 assignment. Now, let's see whether DNS information has been provided, too. $ less /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTENnameserver 2001:4860:4860::8888nameserver 2001:4860:4860::8844nameserver 192.168.1.2nameserver 127.0.1.1search ios.mu Nicely done. Windows - netsh Per description on TechNet the netsh is defined as following: "Netsh is a command-line scripting utility that allows you to, either locally or remotely, display or modify the network configuration of a computer that is currently running. Netsh also provides a scripting feature that allows you to run a group of commands in batch mode against a specified computer. Netsh can also save a configuration script in a text file for archival purposes or to help you configure other servers." And even though TechNet states that it applies to Windows Server (only), it is also available on Windows client operating systems, like Vista, Windows 7 and Windows 8. In order to get or even set information related to IPv6 protocol, we have to switch the netsh interface context prior to our queries. Open a command prompt in Windows and run the following statements: C:\Users\joki>netshnetsh>interface ipv6netsh interface ipv6>show interfaces Select the device index from the Idx column to get more details about the IPv6 address and DNS server information (here: I'm going to use my WiFi device with device index 11), like so: netsh interface ipv6>show address 11 Okay, address information has been provided. Now, let's check the details about DNS and resolving host names: netsh interface ipv6> show dnsservers 11 Okay, that looks good already. Our Windows client has a valid IPv6 address lease with lifetime information and details about the configured DNS servers. Talking about DNS server... Your clients should be able to connect to your network servers via IPv6 using hostnames instead of IPv6 addresses. Please read on about how to enable a local named with IPv6.

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• Using Table-Valued Parameters in SQL Server

  - by Jesse

  I work with stored procedures in SQL Server pretty frequently and have often found myself with a need to pass in a list of values at run-time. Quite often this list contains a set of ids on which the stored procedure needs to operate the size and contents of which are not known at design time. In the past I’ve taken the collection of ids (which are usually integers), converted them to a string representation where each value is separated by a comma and passed that string into a VARCHAR parameter of a stored procedure. The body of the stored procedure would then need to parse that string into a table variable which could be easily consumed with set-based logic within the rest of the stored procedure. This approach works pretty well but the VARCHAR variable has always felt like an un-wanted “middle man” in this scenario. Of course, I could use a BULK INSERT operation to load the list of ids into a temporary table that the stored procedure could use, but that approach seems heavy-handed in situations where the list of values is usually going to contain only a few dozen values. Fortunately SQL Server 2008 introduced the concept of table-valued parameters which effectively eliminates the need for the clumsy middle man VARCHAR parameter. Example: Customer Transaction Summary Report Let’s say we have a report that can summarize the the transactions that we’ve conducted with customers over a period of time. The report returns a pretty simple dataset containing one row per customer with some key metrics about how much business that customer has conducted over the date range for which the report is being run. Sometimes the report is run for a single customer, sometimes it’s run for all customers, and sometimes it’s run for a handful of customers (i.e. a salesman runs it for the customers that fall into his sales territory). This report can be invoked from a website on-demand, or it can be scheduled for periodic delivery to certain users via SQL Server Reporting Services. Because the report can be created from different places and the query to generate the report is complex it’s been packed into a stored procedure that accepts three parameters: @startDate – The beginning of the date range for which the report should be run. @endDate – The end of the date range for which the report should be run. @customerIds – The customer Ids for which the report should be run. Obviously, the @startDate and @endDate parameters are DATETIME variables. The @customerIds parameter, however, needs to contain a list of the identity values (primary key) from the Customers table representing the customers that were selected for this particular run of the report. In prior versions of SQL Server we might have made this parameter a VARCHAR variable, but with SQL Server 2008 we can make it into a table-valued parameter. Defining And Using The Table Type In order to use a table-valued parameter, we first need to tell SQL Server about what the table will look like. We do this by creating a user defined type. For the purposes of this stored procedure we need a very simple type to model a table variable with a single integer column. We can create a generic type called ‘IntegerListTableType’ like this: CREATE TYPE IntegerListTableType AS TABLE (Value INT NOT NULL) Once defined, we can use this new type to define the @customerIds parameter in the signature of our stored procedure. The parameter list for the stored procedure definition might look like: 1: CREATE PROCEDURE dbo.rpt_CustomerTransactionSummary 2: @starDate datetime, 3: @endDate datetime, 4: @customerIds IntegerListTableTableType READONLY   Note the ‘READONLY’ statement following the declaration of the @customerIds parameter. SQL Server requires any table-valued parameter be marked as ‘READONLY’ and no DML (INSERT/UPDATE/DELETE) statements can be performed on a table-valued parameter within the routine in which it’s used. Aside from the DML restriction, however, you can do pretty much anything with a table-valued parameter as you could with a normal TABLE variable. With the user defined type and stored procedure defined as above, we could invoke like this: 1: DECLARE @cusomterIdList IntegerListTableType 2: INSERT @customerIdList VALUES (1) 3: INSERT @customerIdList VALUES (2) 4: INSERT @customerIdList VALUES (3) 5:  6: EXEC dbo.rpt_CustomerTransationSummary 7: @startDate = '2012-05-01', 8: @endDate = '2012-06-01' 9: @customerIds = @customerIdList   Note that we can simply declare a variable of type ‘IntegerListTableType’ just like any other normal variable and insert values into it just like a TABLE variable. We could also populate the variable with a SELECT … INTO or INSERT … SELECT statement if desired. Using The Table-Valued Parameter With ADO .NET Invoking a stored procedure with a table-valued parameter from ADO .NET is as simple as building a DataTable and passing it in as the Value of a SqlParameter. Here’s some example code for how we would construct the SqlParameter for the @customerIds parameter in our stored procedure: 1: var customerIdsParameter = new SqlParameter(); 2: customerIdParameter.Direction = ParameterDirection.Input; 3: customerIdParameter.TypeName = "IntegerListTableType"; 4: customerIdParameter.Value = selectedCustomerIds.ToIntegerListDataTable("Value");   All we’re doing here is new’ing up an instance of SqlParameter, setting the pamameters direction, specifying the name of the User Defined Type that this parameter uses, and setting its value. We’re assuming here that we have an IEnumerable<int> variable called ‘selectedCustomerIds’ containing all of the customer Ids for which the report should be run. The ‘ToIntegerListDataTable’ method is an extension method of the IEnumerable<int> type that looks like this: 1: public static DataTable ToIntegerListDataTable(this IEnumerable<int> intValues, string columnName) 2: { 3: var intergerListDataTable = new DataTable(); 4: intergerListDataTable.Columns.Add(columnName); 5: foreach(var intValue in intValues) 6: { 7: var nextRow = intergerListDataTable.NewRow(); 8: nextRow[columnName] = intValue; 9: intergerListDataTable.Rows.Add(nextRow); 10: } 11:  12: return intergerListDataTable; 13: }   Since the ‘IntegerListTableType’ has a single int column called ‘Value’, we pass that in for the ‘columnName’ parameter to the extension method. The method creates a new single-columned DataTable using the provided column name then iterates over the items in the IEnumerable<int> instance adding one row for each value. We can then use this SqlParameter instance when invoking the stored procedure just like we would use any other parameter. Advanced Functionality Using passing a list of integers into a stored procedure is a very simple usage scenario for the table-valued parameters feature, but I’ve found that it covers the majority of situations where I’ve needed to pass a collection of data for use in a query at run-time. I should note that BULK INSERT feature still makes sense for passing large amounts of data to SQL Server for processing. MSDN seems to suggest that 1000 rows of data is the tipping point where the overhead of a BULK INSERT operation can pay dividends. I should also note here that table-valued parameters can be used to deal with more complex data structures than single-columned tables of integers. A User Defined Type that backs a table-valued parameter can use things like identities and computed columns. That said, using some of these more advanced features might require the use the SqlDataRecord and SqlMetaData classes instead of a simple DataTable. Erland Sommarskog has a great article on his website that describes when and how to use these classes for table-valued parameters. What About Reporting Services? Earlier in the post I referenced the fact that our example stored procedure would be called from both a web application and a SQL Server Reporting Services report. Unfortunately, using table-valued parameters from SSRS reports can be a bit tricky and warrants its own blog post which I’ll be putting together and posting sometime in the near future.

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• [iPhone] Objective-C : UIScrollView manual paging

  - by Daniel

  Hi Folks! I want to use the scrollview as something like a picker in horizontal mode. The scrollview holds up to seven subviews. Each subview represents a value. Always three views are visible and the one in the middle is the selected one. Scrollview visible at start: __ | V1 | V2 Scrollview set to view/value two: V1 | V2 | V3 Scrollview set to last value: V2 | V3 | __ The real problem I have got is the "pagingEnabled" flag. If pagingEnabled is set to YES the scrollview pages always three subviews/values instead of only one. If pagingEnabled is set to NO the scrollview does not clinch. Is there a nice solution for my problem? Thanks a lot, Dan ;)

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• What kind of knowledge do you need to invent a new programming language?

  - by systempuntoout

  I just finished to read "Coders at works", a brilliant book by Peter Seibel with 15 interviews to some of the most interesting computer programmers alive today. Well, many of the interviewees have (co)invented\implemented a new programming language. Some examples: Joe Armstrong: Inventor of Erlang L. Peter Deutsch: implementer of Smalltalk-80 Brendan Eich: Inventor of JavaScript Dan Ingalls: Smalltalk implementor and designer Simon Peyton Jones: Coinventor of Haskell Guy Steele: Coinventor of Scheme Is out of any doubt that their minds have something special and unreachable, and i'm not crazy to think i will ever able to create a new language; i'm just interested in this topic. So, imagine a funny\grotesque scenario where your crazy boss one day will come to your desk to say "i want a new programming language with my name on it..take the time you need and do it", which is the right approach to studying this fascinating\intimidating\magic topic? What kind of knowledge do you need to model, design and implement a brand new programming language?

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• What kind of knowledge you need to invent a new programming language?

  - by systempuntoout

  I just finished to read "coders at works", a brilliant book by Peter Seibel with 15 interviews to some of the most interesting computer programmers alive today. Well, many of the interviewees have (co)invented\implemented a new programming language. For example: * Joe Armstrong: Inventor of Erlang * L. Peter Deutsch: implementer of Smalltalk-80 * Brendan Eich: Inventor of JavaScript * Dan Ingalls: Smalltalk implementor and designer * Simon Peyton Jones: Coinventor of Haskell * Guy Steele: Coinventor of Scheme Is out of any doubt that their minds have something special and unreachable, and i'm not crazy to think i will ever able to create a new language; i'm just interested in this topic. So, imagine a funny\grotesque scenario where your crazy boss one day will come to your desk to say "i want a new programming language with my name on it..take the time you need and do it", what will you start to study? What kind of knowledge do you need to model, design and implement a brand new programming language?

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• Having trouble with Regular Expression and Ampersand

  - by ajax81

  Hi All, I'm having a bit of trouble with regex's (C#, ASP.NET), and I'm pretty sure I'm doing something fundamentally wrong. My task is to bind a dynamically created gridview to a datasource, and then iterate through a column in the grid, looking for the string "A&I". An example of what the data in the cell (in template column) looks like is: Name: John Doe Phone: 555-123-1234 Email: [email protected] Dept: DHS-A&I-MRB Here's the code I'm using to find the string value: foreach(GridViewRow gvrow in gv.Rows) { Match m = Regex.Match(gvrow.Cells[6].Text,"A&I"); if(m.Success) { gvrow.ForeColor = System.Drawing.Color.Red; } } I'm not having any luck with any of these variations: "A&I" "[A][&][I]" But when I strictly user "&", the row does turn red. Any suggestions? Thanks, Dan

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• PySide / PyQt QStyledItemDelegate list in table

  - by danodonovan

  Dear All, I'm trying to create a table of lists in Python with Qt (PySide/PyQt - matters not) and my lists are squashed into the table cells. Is there a way to get the list delegates to 'pop out' of their cells? I've attached a simple code snippet - replace 'PySide' with 'PyQt4' depending on your preference from PySide import QtCore, QtGui class ListDelegate(QtGui.QStyledItemDelegate): def createEditor(self, parent, option, index): editor = QtGui.QListWidget(parent) for i in range( 12 ): editor.addItem('list item %d' % i) return editor if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) model = QtGui.QStandardItemModel(2, 2) tableView = QtGui.QTableView() delegate = ListDelegate() tableView.setItemDelegate(delegate) tableView.setModel(model) for row in range(2): for column in range(2): item = QtGui.QStandardItem( 'None' ) model.setItem(row, column, item) tableView.setWindowTitle('example') tableView.show() sys.exit(app.exec_()) If you hadn't guessed I'm pretty new to this Qt lark Thanks in advance, Dan

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• T-SQL How To: Compare and List Duplicate Entries in a Table

  - by Dan7el

  SQL Server 2000. Single table has a list of users that includes a unique user ID and a non-unique user name. I want to search the table and list out any users that share the same non-unique user name. For example, my table looks like this: ID User Name Name == ========= ==== 0 parker Peter Parker 1 parker Mary Jane Parker 2 heroman Joseph (Joey) Carter Jones 3 thehulk Bruce Banner What I want to do is do a SELECT and have the result set be: ID User Name Name == ========= ==== 0 parker Peter Parker 1 parker Mary Jane Parker from my table. I'm not a T-SQL guru. I can do the basic joins and such, but I'm thinking there must be an elegant way of doing this. Barring elegance, there must be ANY way of doing this. I appreciate any methods that you can help me with on this topic. Thanks! ---Dan---

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• How to reinforce pseudo css rules

  - by danwoods

  Is there anyway to reinforce pseudo css rules? ie: I have a listing of divs (playlist) which I color with the following rules: #playlist .playlist_item { background: #d6d6d6; } #playlist .playlist_item:nth-child(odd) { background: #b3b3b3; } Now, when a song is playing, I use setInterval and JQuery's .animate function to pulse the background color. When the song is finished I clear the interval, but of course the song's background remains the last color set in the interval. Is there a way to re-set the song's color based on the CSS rule? Otherwise I'll have to keep track of the previous song (which may have changed position, and thus color) or setup distinct background color classes and reset the classes of all the songs in the playlist anytime someone adds, removes, or moves a song in the playlist or a song ends. I'd much rather use a CSS only approach. Thanks in advance, Dan

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• Creating multiple log files of different content with log4j

  - by Daniel

  Is there a way to configure log4j so that it outputs different levels of logging to different appenders? I'm trying to set up multiple log files. The main log file would catch all INFO and above messages for all classes. (In development, it would catch all DEBUG and above messages, and TRACE for specific classes.) Then, I would like to have a separate log file. That log file would catch all DEBUG messages for a specific subset of classes, and ignore all messages for any other class. Is there a way to get what I'm after? Thanks, Dan

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• Aborting jQuery().load()

  - by Daniel I-S

  The .load() function of the jQuery library allows you to selectively load elements from another page (subject to certain rules). I would like to know whether it is possible to abort the load process. In our application, a user can browse a list of items. They may choose to click a button which loads and displays additional information about an item from another document (which can take some time). If they choose a different item in the list whilst a .load() is still happening, I would like the loading to be aborted. Is this possible? Is it even worth it? Any ideas? Dan

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• rsync creating thousands of ..ds_store files from mounted volume

  - by daniel Crabbe

  hello there - been using rsync on os x to sync all our website admins. it was working fine until the os x 10.6.3 update! Now it creates thousands of ZeroK folders. It only does it when synching to a mounted drive(which we need to do) as when i sync to my hd it works as usual! i've tried excludes which don't seem to be working... also tried different version of rsync so its an os x issue. echo "" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" echo " SYNCING up KINEMASTIK" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" /usr/local/bin/rsync -aNHAXv --progress --exclude-from 'exclude.txt' /Volumes/Groups/Projects/483_Modern_Activity_Website/web/youradmin/ /Users/dan/Dropbox/documents/WORK/kinemastik/WEBSITE/youradmin/ echo "" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" echo " SYNCING up CHRIS BROOKS YOURADMIN" echo "~*~*~*~*~*~*~*~*~*~*~*~*~*" /usr/local/bin/rsync -aNHAXv --progress --exclude-from 'exclude.txt' /Volumes/Groups/Projects/483_Modern_Activity_Website/web/youradmin/ /Volumes/Groups/Projects/516_ChrisBrooks/website/youradmin/ anyone experienced the same? many thnks, D.

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• Why am I getting unexpected output trying to write a hash structure to a file?

  - by Harm De Weirdt

  I have a hash in which I store the products a customer buys (%orders). It uses the product code as key and has a reference to an array with the other info as value. At the end of the program, I have to rewrite the inventory to the updated version (i.e. subtract the quantity of the bought items) This is how I do rewrite the inventory: sub rewriteInventory{ open(FILE,'>inv.txt'); foreach $key(%inventory){ print FILE "$key\|$inventory{$key}[0]\|$inventory{$key}[1]\|$inventory{$key}[2]\n" } close(FILE); } where $inventory{$key}[x] is 0 → Title, 1 → price, 2 → quantity. The problem here is that when I look at inv.txt afterwards, I see things like this: CD-911|Lady Gaga - The Fame|15.99|21 ARRAY(0x145030c)||| BOOK-1453|The Da Vinci Code - Dan Brown|14.75|12 ARRAY(0x145bee4)||| Where do these ARRAY(0x145030c)||| entries come from? Or more important, how do I get rid of them?

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• Image selector/picker

  - by MrThomas

  Using Ruby on Rails what steps can I take to create a image picker. This is a image object which I can use all over my app: Using paperclip and a polymathic association making images available to all other models. I wish to list the images in each model and chose which of them is associated to a individual new or old record. for example: I could use the image as a sidebar image or a banner or advert image etc. I would be great full for any help. Thanks Dan

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• Can someone explain the ivy.xml dependency's conf attribute?

  - by tieTYT

  I can't find any thorough explanation of the ivy dependency tag's conf attribute: <dependency org="hibernate" name="hibernate" rev="3.1.3" conf="runtime, standalone -> runtime(*)"/> See that conf attribute? I can't find any explanation (that I can understand) about the right hand side of the - symbol. PLEASE keep in mind I don't know the first thing about maven so please explain this attribute with that consideration. Yes, I've already looked at this: http://ant.apache.org/ivy/history/latest-release/ivyfile/dependency.html Thanks, Dan

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• Rails with JQuery DIV manipulation

  - by MrThomas

  Say I have a loop of objects (style.cover.pic) in a DIV .style_image <% @styles.each do |style| % <div class="style_image"> <%=link_to (image_tag style.cover.pic.url(:small)), style %></div> With the use of JQuery On a click event I want to load (this.href) in to the div .style_image which was click not all of the .style_image DIV's. this is what I have done so fare: $(function() { $(".style_image a").live('click', function(event) { $(".style_image a").load(this.href + " #show_style"); $.get(this.href, null, null, "script"); return false; }); }); Can this be done? and yes how??? Regards Dan

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• Wrapping allocated output parameters with a scoped_ptr/array

  - by Danra

  So, I have some code which looks like this: byte* ar; foo(ar) // Allocates a new[] byte array for ar ... delete[] ar; To make this safer, I used a scoped_array: byte* arRaw; scoped_array ar; foo(arRaw); ar.reset(arRaw); ... // No delete[] The question is, Is there any existing way to do this using just the scoped_array, without using a temporary raw array? I can probably write an in-place "resetter" class, just wondering if the functionality exists and I'm missing it. Thanks, Dan

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• How to optimize neural network by using genetic algorithm?

  - by Billy Coen

  I'm quite new with this topic so any help would be great. What i need is to optimize a neural network in MATLAB by using GA. My network has [2x98] input and [1x98] target, i've tried consulting matlab help but im still kind of clueless about what to do :( so, any help would be appreciated. Thanks in advance. edit: i guess i didn't say what is there to be optimized as Dan said in the 1st answer. I guess most important thing is number of hidden neurons. And maybe number of hidden layers and training parameters like number of epochs or so. Sorry for not providing enough info, i'm still learning about this.

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• Using PHP to place database rows into an array?

  - by Hamed Szilazi

  I was just wondering how i would be able to code perform an SQL query and then place each row into a new array, for example, lets say a table looked like the following: $people= mysql_query("SELECT * FROM friends") Output: | ID | Name | Age | --1----tom----32 --2----dan----22 --3----pat----52 --4----nik----32 --5----dre----65 How could i create a multidimensional array that works in the following way, the first rows second column data could be accessed using $people[0][1] and fifth rows third column could be accessed using $people[4][2]. How would i go about constructing this type of array? Sorry if this is a strange question, its just that i am new to PHP+SQL and would like to know how to directly access data. Performance and speed is not a issue as i am just writing small test scripts to get to grips with the language.

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• Using GLOrtho to view Side, Front, Top perspectives of a 3D scene

  - by talldan

  Dear all, I'm building a game level editing app as part of a university project. In my application I have multiple viewports, a Perspective viewport and three orthographic views all setup to view the same scene. I've successfuly setup the orthographic views and can translate and scale them to mimic scrolling and zooming. Unfortunately, I'm having one problem - my scene still contains 3 dimensions, so objects viewed in orthographic mode of certain depths are clipped when they fall outside of my clipping volume. Most 3D authoring tools or level editors allow you to view all objects in orthographic mode regardless of depth. I guess what I need to do is scale my scene in the appropriate dimension so that all values lie between 1 and -1, is there a straightforward way of going about this? Or is there a different better approach. Thanks very much for your help, Dan

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• Using ScriptCombining through a ScriptManager on a Master Page

  - by Hmobius

  ASP.NET 3.5 SP1 adds a great new ScriptCombining feature to the ScriptManager object as demonstrated on this video. However he only demonstrates how to use the feature with the ScriptManager on the same page. I'd like to use this feature on a site where the scriptmanager is on the master page but can't figure out how to add the scripts I need for each page programmatically to the manager. I've found this post to use as a starting point, but I'm not really getting very far. can anyone give me a helping hand? Thanks, Dan

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