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• How do I do automatic data serialization of data objects in Haskell

  - by Adam Gent

  One of the huge benefits in languages that have some sort of reflection/introspecition is that objects can be automatically constructed from a variety of sources. For example in Java I can use the same objects for persisting to a db (with Hibernate) serializing to XML (with JAXB) or serializing to JSON (json-lib). You can do the same in Ruby and Python also usually following some simple rules for properties or annotations for Java. Thus I don't need lots "Domain Transfer Objects". I can concentrate on the domain I am working in. It seems in very strict FP like Haskell and Ocaml this is not possible. Particularly Haskell. The only thing I have seen is doing some sort of preprocessing or meta-programming (ocaml). Is it just accepted that you have to do all the transformations from the bottom upwards? In other words you have to do lot of boring work to turn a data type in haskell into JSON/XML/DB Row object and back again into a data object.

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• What should I grab as a development platform, an iPod or an iPad?

  - by mmr

  Hey all, I've recently gotten into the world of contract programming, and two of my clients have indicated that they'd like to do something 'trendy', like ipod touch/iphone/ipad development. I have a mac laptop (first gen macbook pro) that I'll have to upgrade to snow leopard to do the development for any of them, from what I've read. So that's already a bit of a commitment, given all the stuff I have on that laptop I'll have to make sure is recoverable from backup. My budget is limited, but I think I need to learn this skill. Which device should I get to learn this kind of development, an iPod touch or an iPad? I don't have the money for an iPhone. I think that the iPhone/iPad SDK has an emulator mode, but I like to have the device I'm going to roll out on available to make sure that everything works as I'd expect, ie, what's easily readable on a laptop screen is still readable on the touch, etc.

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• How to build a programmer's wiki

  - by Llistes Sugra

  For years I've missed a wiki so everyone could describe the new tools programmed, the servers where they are running, svn information, the internal rules of programming, how-tos, code samples, etc. The wiki might be used for the dozen of programmers in the company and the externals. I've been using a pmwiki (easy install) and now I want a better approach. What wiki do you use? What plug-ins? Do you think there are better systems than wiki for this?

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• Mysql adapter for Zend_Translate

  - by Peter

  Hi everybody, I'm currently in the planning phase of a rather large project that I'll develop in the Zend Framework. One of the problems I'm facing is that the customers will want to translate not only the content but also the interface. I'm currently using gettext and poedit to manage my language files but this is not an option for the customer as they, for one, want have FTP access to the site. Hence, I'm thinking of a mysql back end with an interface in the front end for the customer to manage his own translations of the interface. There is however still no mysql adapater for Zend_Translate. So, does anybody now of an adapter script for Zend_Translate so it can work with a mysql table? Or any arguments against using mysql and possible other solutions for this problem?

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• How can I get a file's upload size using simple Javascript?

  - by Pankaj Khurana

  I have upload file functionality on one of the page. I check for the extension of the file using JavaScript. Now i want to restrict the user from uploading file greater than 1 MB. Is there any way i can check the file upload size using JavaScript. My code currently look like this: <script language="JavaScript"> function validate() { var filename = document.getElementById("txtChooseFile").value; var ext = getExt(filename); if(ext == "txt" || ext == "csv") return true; alert("Please upload Text files only."); return false; } function getExt(filename) { var dot_pos = filename.lastIndexOf("."); if(dot_pos == -1) return ""; return filename.substr(dot_pos+1).toLowerCase(); } </script>

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• How to Conduct an online coding competition?

  - by Alice

  I need to design a website for a programming competition event. It will be similar to TOP CODER competitions. User will be given all questions & then user submits the code, that will be running on the server and checks if it gives the correct solution or not. The first one to finish all the questions is the winner. I've no clue about how to proceed. Assume that languages that are supported are C, C++, Java.

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• Why can't I install psycopg2? (Python 2.6.4, PostgreSQL 8.4, OS X 10.6)

  - by cojadate

  After running python setup.py install I get the following: Warning: Unable to find 'pg_config' filebuilding 'psycopg2._psycopg' extension gcc-4.0 -arch ppc -arch i386 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 - DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.2.1 (dt dec ext pq3)" -DPSYCOPG_EXTENSIONS=1 -DPSYCOPG_NEW_BOOLEAN=1 -DHAVE_PQFREEMEM=1 -DHAVE_PQPROTOCOL3=1 -I/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -I. -c psycopg/psycopgmodule.c -o build/temp.macosx-10.3-fat-2.6/psycopg/psycopgmodule.o unable to execute gcc-4.0: No such file or directory error: command 'gcc-4.0' failed with exit status 1 There's probably something screamingly obvious there to anyone who knows the first thing about back-end web programming, but unfortunately it's all gobbledegook to me. The psycopg2 documentation was not helpful.

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• Visual Studio 2008. MFC event wizard broken

  - by G Forty

  OK, so it's almost a programming question - The VS2008 dialog event wizard has stopped working. Double-clicking on a button in an MFC dialog project does not fire the wizard as usual and a right-click to get to the 'Add Event Handler...' shows a dialog with no message types. Further to this the MFC message mapping and virtual class listing that generally appears in the properties window (Alt + Enter) is now empty. Has anyone elese seen this and if so, how'd they fix it? I have 'repaired' my VS08 installation ... Thx++ Jerry

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• Why does Excel expose an 'Evaluate' method at all?

  - by jtolle

  A few questions have come up recently involving the Application.Evaluate method callable from Excel VBA. The old XLM macro language also exposes an EVALUATE() function. Both can be quite useful. Does anyone know why the general expression evaluator is exposed, though? My own hunch is that Excel needed to give people a way to get ranges from string addresses, and to get the value of named formulas, and just opening a portal to the expression evaluator was the easiest way. But of course you don't need the ability to evaluate arbitrary expressions just to do that. Application.Evaluate seems kind of...unfinished. It isn't very well documented, and there are quite a few quirks and limitations (as described by Charles Williams here: http://www.decisionmodels.com/calcsecretsh.htm) with what is exposed. I suppose the answer could be simply "why not expose it?", but I'd be interested to know what design decisions led to this feature. Failing that, I'd be interested to hear other hunches.

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• question on database query using hibernate in java with annotations

  - by molleman

  Hello, simple question regarding HQL(Hibernate query language) so i have user class , that can hold a list of Projects, how do i take this out of the database depending on a username, this is how i take out my user String username = "stephen"; YFUser user = (YFUser) session.createQuery("select u FROM YFUser u where u.username = :username").setParameter("username", name).uniqueResult(); but i want to take out the list of projects here is the projects list within the class YFUser(my user class); how would i query the database to get this list of projects @Entity @Table(name = "yf_user_table") public class YFUser implements Serializable,ILightEntity { ......... @OneToMany(cascade = CascadeType.ALL,fetch = FetchType.LAZY) @JoinTable(name = "YFUSER_JOIN_PROJECT", joinColumns = { @JoinColumn(name = "user_id") }, inverseJoinColumns = { @JoinColumn(name = "project_id") }) private List<Project> projects = new ArrayList<Project>();

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• What fields have job security?

  - by computergeek6

  I can program pretty well, and I'm trying to think of a programming area that I can practice so I have a better chance of getting a job when I finish my education. I'm currently learning game development, but there are a ton of other people trying to get into game dev, so I want to find something a little more secure and sustainable to develop skills in. I've thought of things like financial systems and engineering stuff, but nothing I can think of is accessible to someone in high school. I'm trying to find something that involves physics or networking and isn't as popular a field as game dev. Does anyone have any ideas?

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• What helpful tactics have you employed to keep your development team on-track?

  - by Ed Altorfer

  I realize that this is a subjective question, so I've marked it as a community wiki. I think that it is pretty specific to programming teams, though, so I've posted it here as opposed to somewhere else. I'm leading a small game development team (four people) as a side project. We are a disjoint team, with everyone in different places, but we do have some of the mainstays of an organized team. Source Control Continuous Integration Bug Tracking Document Workspace Regular Meetings Calendar / Schedule How do you keep your small, disjoint teams on-track? I tend to agree with Joel's opinion about when and how to micromanage and know that my team is motivated, but it can be easy to fall off-course when everyone isn't connected in a physical way and doesn't see what other people on the team are doing. Suggestions, feedback, or criticisms are welcome! Edit: I'm managing the team; I'm not looking for automated tools or anything to do my job for me, just ideas for approach or process that might help everyone feel more "connected" and involved.

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• iPad: CoreData FetchedRequest Ignores Changes in Predicate

  - by Michael

  Hi there, While programming an iPad-app, I'm just running into trouble using a fetchedResultsController with a "dynamic" predicate. it seems the changes to the predicate get ignored. No matter how the predicate changes, I always get the result of the first fetch ... same code runs without no problems on iphone-env (3.1.x) !! sample : - (void)performSearch:(NSString *)searchText { self.displaySearchResults = TRUE; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"searchWords contains[cd] %@", searchText]; [self.fetchedSearchResultsController.fetchRequest setPredicate:predicate]; NSError *error = nil; if (![self.fetchedSearchResultsController performFetch:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } if(deviceIsIPad) { [self showSearchResults]; } else { [cookBookOverview reloadData]; } } can anyone help plz ? btw.: excuse my painful english ;-)

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• Can I add an additional eula/tos inside my app on top of the iphone app store agreement

  - by nickthedude

  I have an app that allows users to generate and publish content. I would like to possibly be able to use the content they publish/create to make derivative works, ie books etc (similar to what icanhazcheeseburger has done.) If I were to put an opt in alert to ask the user whether or not they would like to be a part of this, would this violate the iphone sdk? I know this is not programming question so I'm not sure if this is a fair question, but I thought I heard something like you can't add a eula you have to abide by whatever apple dictates in their app store agreement. Also if you have suggestions on different ways to approach getting users to agree to this I'm all ears, but yes that is kind of subjective. Thanks folks, Nick

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• #pragma directive and its uses in c

  - by sandy101

  Hello , can anyone tell my what does the #pragma can do in the c language . what are its uses and why the above program is not giving the output 'inside v1'& 'inside v2' in the following program ... include void v1(); void v2(); pragma startup v1 pragma exit v2 int main() { printf("inside main\n"); return 0; } void v1() { printf("inside v1\n"); } void v2() { printf("inside v2\n"); } i also want to know what a are the uses of the #pragma directive .... plz help

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• Function Object in Java .

  - by Tony

  I wanna implement a javascript like method in java , is this possible ? Say , I have a Person class : public class Person { private String name ; private int age ; // constructor ,accessors are omitted } And a list with Person objects: Person p1 = new Person("Jenny",20); Person p2 = new Person("Kate",22); List<Person> pList = Arrays.asList(new Person[] {p1,p2}); I wanna implement a method like this: modList(pList,new Operation (Person p) { incrementAge(Person p) { p.setAge(p.getAge() + 1)}; }); modList receives two params , one is a list , the other is the "Function object", it loops the list ,and apply this function to every element in the list. In functional programming language,this is easy , I don't know how java do this? Maybe could be done through dynamic proxy, does that have a performance trade off?

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• Tools and ways to generate HTML help for built-in help system (QtHelp)?

  - by BastiBense

  Hello, I'm in the progress of implementing a built-in help system based on QtHelp into my application. Since QtHelp is based on Qt's help collection files, I need to produce a set of HTML pages. Since I won't be writing the documentation alone (a few of my colleagues will write, too), I am looking for the best way to produce these files. We are internally using a Wiki, and I know that the documentation should be written in some kind of markup language instead of giving all authors a WYSIWYG HTML editor. So my question is, are there tools out there which help with the process of generating documentation that can be exported as a set of HTML files, and possibly, as PDFs, too?. Thanks in advance! Update: I'm already using Doxygen for C++ documentation generation. But I'm not exactly looking for an API-Documentation generator, but something like LaTeX, which allows you to format the documentation contents like a markup document (much like a Wiki).

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• Why the "mutable default argument fix" syntax is so ugly, asks python newbie

  - by Cawas

  Now following my series of "python newbie questions" and based on another question. Go to http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html#other-languages-have-variables and scroll down to "Default Parameter Values". There you can find the following: def bad_append(new_item, a_list=[]): a_list.append(new_item) return a_list def good_append(new_item, a_list=None): if a_list is None: a_list = [] a_list.append(new_item) return a_list So, question here is: why is the "good" syntax over a known issue ugly like that in a programming language that promotes "elegant syntax" and "easy-to-use"? Why not just something in the definition itself, that the "argument" name is attached to a "localized" mutable object like: def better_append(new_item, a_list=[].local): a_list.append(new_item) return a_list I'm sure there would be a better way to do this syntax, but I'm also almost positive there's a good reason to why it hasn't been done. So, anyone happens to know why?

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• Large Scale VHDL techniques

  - by oxinabox.ucc.asn.au

  I'm thinking about implimenting a 16 bit CPU in VHDL. A simplish CPU. ADD, MULS, NEG, BitShift, JUMP, Relitive Jump, BREQ, Relitive BREQ, i don't know somethign along these lines Probably all only working with 16bit operands. I might even cut it down and use only a single operand and a accumulator. With Some status regitsters, Carry, Zero, Neg (unless i use a Accumlator), I know how to design all the parts from logic gates, and plan to build them up from first priciples, So for my ALU I'll need to 'build' a ADDer, proably a Carry Look ahead, group adder, this adder it self is make up oa a couple of parts, wich are themselves made up of a couple of parts. Anyway, my problem is not the CPU design, or the VHDL (i know the language, more or less). It's how i should keep things organised. How should I use packages, How should I name my processes and port maps? (i've never seen the benifit of naming the port maps, or processes)

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• How do you go from an abstract project description to actual code?

  - by Jason

  Maybe its because I've been coding around two semesters now, but the major stumbling block that I'm having at this point is converting the professor's project description and requirements to actual code. Since I'm currently in Algorithms 101, I basically do a bottom-up process, starting with a blank whiteboard and draw out the object and method interactions, then translate that into classes and code. But now the prof has tossed interfaces and abstract classes into the mix. Intellectually, I can recognize how they work, but am stubbing my toes figuring out how to use these new tools with the current project (simulating a web server). In my professors own words, mapping the abstract description to Java code is the real trick. So what steps are best used to go from English (or whatever your language is) to computer code? How do you decide where and when to create an interface, or use an abstract class?

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• How to Get a Webpage's contents without CURL ?

  - by Arsheep

  I need to get webpage's content ,I cant use Curl as it is not enabled.I tried the below code But it is not working. $opts = array( 'http'=>array( 'method'=>"GET", 'header'=>"Accept-language: en\r\n" . "Cookie: foo=bar\r\n" ) ); $context = stream_context_create($opts); $fp = fopen($_GET['url'], 'r', false, $context); if($fp) fpassthru($fp); fclose($fp); exit; The code produce an error Warning: fopen(http://www.google.com/search?&q=site:www.myspace.com+-intitle:MySpaceTV+%22Todd Terje%22) [function.fopen]: failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request

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• Flags with border on hover

  - by Alpan67

  Hello I have 3 flags (Italian, german, english) with the purpose to change language for the whole site in future. How can I make a border on a hover effect that could alxo work with IE ? this is the CCS .miniflags { float:right margin : 5px 20px; padding-right:10px; } and here the HTML <div id="bandiere"> <a><img src="ita.png" class="miniflags" /></a> <a><img src="ger.png" class="miniflags" /></a> <a><img src="eng.png" class="miniflags" /></a> </div> Thanx for help Alex

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• COM port - how to identify a device (.net/c#)

  - by argh

  Hi, I'm programming for Windows CE and I need to connect to a scanner. There is no problem - I know that it is on port COM0, but if I plug in another device earlier it gets another COM port... to get all com ports the easy way is: SerialPort.GetPortNames() But I don't know how to identify a device? Is there any standard way? I can't 'ping' it since there is one device that only sends data... it spams data all the time... and I don't know how to 'ping' a device...

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• Help with Event-Based Components

  - by Joel in Gö

  I have started to look at Event-Based Components (EBCs), a programming method currently being explored by Ralf Wesphal in Germany, in particular. This is a really interesting and promising way to architect a software solution, and gets close to the age-old idea of being able to stick software components together like Lego :) A good starting point is the Channel 9 video here, and there is a fair bit of discussion in German at the Google Group on EBCs. I am however looking for more concrete examples - while the ideas look great, I am finding it hard to translate them into real code for anything more than a trivial project. Does anyone know of any good code examples (in C# preferably), or any more good sites where EBCs are discussed?

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• Scala and the Java Memory Model

  - by Ben Lings

  The Java Memory Model (since 1.5) treats final fields differently to non-final fields. In particular, provided the this reference doesn't escape during construction, writes to final fields in the constructor are guaranteed to be visible on other threads even if the object is made available to the other thread via a data race. (Writes to non-final fields aren't guaranteed to be visible, so if you improperly publish them, another thread could see them in a partially constructed state.) Is there any documentation on how/if the Scala compiler creates final (rather than non-final) backing fields for classes? I've looked through the language specification and searched the web but can't find any definitive answers. (In comparison the @scala.volatile annotation is documented to mark a field as volatile)

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