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• Alternatives to WPD/WIA on Windows XP?

  - by Marek

  WPD does not work correctly on Windows XP (SP1 if that matters), even if Microsoft states it does. Problem with WPD: IPortableDeviceManager.GetDevices call does not find any devices on Win XP while it finds all connected cameras on Windows 7. A few other people had this same problem with WPD not working on XP, no solution: 1 2 I have decided to reimplement the functionality using WIA. Problem with WIA automation/WIA interfaces: WIA automation offers only silly dialogs when interacting with the camera - I need to rather do this from code Programming against WIA interfaces is recommended to achieve lower level tasks with WIA. I have not found any samples how to use WIA interfaces from C# (also found some indication that this is not possible at all or at least very hard to do) Thus I have looked at WIA 2.0 (wrapper around wiaaut.dll): I am getting HRESULT 0x80210006 (WIA_ERROR_BUSY) for the first time and then HRESULT E_FAIL all the time on Win XP while on Windows 7 the same code works without a problem. I am getting out of options here... Can you recommend an alternative to provide the following features for cameras connected to the computer that works on Windows XP? sends a notification that a picture was taken allows to download the recently taken picture from the camera

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• Context migration in CUDA.NET

  - by Vyacheslav

  I'm currently using CUDA.NET library by GASS. I need to initialize cuda arrays (actually cublas vectors, but it doesn't matters) in one CPU thread and use them in other CPU thread. But CUDA context which holding all initialized arrays and loaded functions, can be attached to only one CPU thread. There is mechanism called context migration API to detach context from one thread and attach it to another. But i don't how to properly use it in CUDA.NET. I tried something like this: class Program { private static float[] vector1, vector2; private static CUDA cuda; private static CUBLAS cublas; private static CUdeviceptr ptr; static void Main(string[] args) { cuda = new CUDA(false); cublas = new CUBLAS(cuda); cuda.Init(); cuda.CreateContext(0); AllocateVectors(); cuda.DetachContext(); CUcontext context = cuda.PopCurrentContext(); GetVectorFromDeviceAsync(context); } private static void AllocateVectors() { vector1 = new float[]{1f, 2f, 3f, 4f, 5f}; ptr = cublas.Allocate(vector1.Length, sizeof (float)); cublas.SetVector(vector1, ptr); vector2 = new float[5]; } private static void GetVectorFromDevice(object objContext) { CUcontext localContext = (CUcontext) objContext; cuda.PushCurrentContext(localContext); cuda.AttachContext(localContext); //change vector somehow vector1[0] = -1; //copy changed vector to device cublas.SetVector(vector1, ptr); cublas.GetVector(ptr, vector2); CUDADriver.cuCtxPopCurrent(ref localContext); } private static void GetVectorFromDeviceAsync(CUcontext cUcontext) { Thread thread = new Thread(GetVectorFromDevice); thread.IsBackground = false; thread.Start(cUcontext); } } But execution fails on attempt to copy changed vector to device because context is not attached? Any ideas how i can get it work?

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• C++ smart pointers: sharing pointers vs. sharing data

  - by Eli Bendersky

  In this insightful article, one of the Qt programmers tries to explain the different kinds of smart pointers Qt implements. In the beginning, he makes a distinction between sharing data and sharing the pointers themselves: First, let’s get one thing straight: there’s a difference between sharing pointers and sharing data. When you share pointers, the value of the pointer and its lifetime is protected by the smart pointer class. In other words, the pointer is the invariant. However, the object that the pointer is pointing to is completely outside its control. We don’t know if the object is copiable or not, if it’s assignable or not. Now, sharing of data involves the smart pointer class knowing something about the data being shared. In fact, the whole point is that the data is being shared and we don’t care how. The fact that pointers are being used to share the data is irrelevant at this point. For example, you don’t really care how Qt tool classes are implicitly shared, do you? What matters to you is that they are shared (thus reducing memory consumption) and that they work as if they weren’t. Frankly, I just don't undersand this explanation. There was a clarification plea in the article comments, but I didn't find the author's explanation sufficient. If you do understand this, please explain. What is this distinction, and how are other shared pointer classes (i.e. from boost or the new C++ standards) fit into this taxonomy? Thanks in advance

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• Implementing Autocompletion in iPhone UITextField for contacts in address book

  - by nacho4d

  Hi, I would like to have a UITextField or UITextView in where as I do some input, alternatives will appear something similar to when you type an address in Mail Application, alternatives appear down and is possible tap them so get a better input user interface.(since there is no need to type the complete word or address or phone number) I do know how to fetch data from Address Book framework, also how to input text in UITextField/UITextView and its delegates but I don't know what kind of structure to use for fetching and showing data as the user do his/her input. I know basic CoreData if this matters, I hope I can get some help. UPDATE (2010/3/10): I don't have problem make a native-like GUI but I am asking about the algorithm, does any body knows what kind algorithm is best for this thing? maybe some binary tree? Or should I just fetch data from coredata everytime? Thanks Ignacio UPDATE (2010/03/28): I've been very busy these days, so I have not tried UISearchResults but it seems fine to me. BUT I wonder was there a necessity of deletion of the wining answer? I don't think is fair my reputation went down and couldn't see the winning answer. ;(

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• Google appengine authentication on iPhone web app on the home screen

  - by Rakesh Pai

  I'm using Google appengine for developing an web application that is meant to be used on both the browser and iphone. I have purchased a domain name for this application, so that I have a pretty URL. I've used the User API for authentication. This works just fine on desktop browsers and iPhone Safari. The user could add the application to the home screen (by tapping the "+" at the bottom toolbar). However when that's done, it seems like the cookies set by Google are not in affect within this "application", and the user is effectively logged out. To make matters worse, when the user clicks on the login link (as generated by GAE), the app closes and opens safari to complete the login. Since the session is apparently not shared between the two, the login process is futile, and the "home-screen" version of the app continues to be logged out. It seems that the cookies are not shared between a "home-screen" app and Safari. It also seems that the "home-screen" app will only work within it's own domain, and any redirect to any other domain will open Safari. Any idea how I can go about fixing this?

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• maven and lift using scala 2.8 : lift-mapper missing?

  - by Bjorn J

  Newbie question since I'm not up to speed using maven at all. I'm trying to use scala + lift using scala 2.8, environment is a win7 box if that matters. I create a basic project using: mvn archetype:generate -U -DarchetypeGroupId=net.liftweb -DarchetypeArtifactId=lift-archetype-basic -DarchetypeVersion=2.0-scala280-SNAPSHOT -DarchetypeRepository=http://scala-tools.org/repo-snapshots -DremoteRepositories=http://scala-tools.org/repo-snapshots -DgroupId=com.liftworkshop -DartifactId=todo -Dversion=1.0-SNAPSHOT So far so good, but then, I try to cd into my new project and do: mvn jetty:run I after quite a few downloads end up with a error like below: [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Failed to resolve artifact. Missing: ---------- 1) net.liftweb:lift-mapper:jar:2.0-scala280-SNAPSHOT Try downloading the file manually from the project website. Then, install it using the command: mvn install:install-file -DgroupId=net.liftweb -DartifactId=lift-mapper -D version=2.0-scala280-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file Alternatively, if you host your own repository you can deploy the file there: mvn deploy:deploy-file -DgroupId=net.liftweb -DartifactId=lift-mapper -Dve rsion=2.0-scala280-SNAPSHOT -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -Dr epositoryId=[id] Path to dependency: 1) com.liftworkshop:todo:war:1.0-SNAPSHOT 2) net.liftweb:lift-mapper:jar:2.0-scala280-SNAPSHOT ---------- 1 required artifact is missing. for artifact: com.liftworkshop:todo:war:1.0-SNAPSHOT from the specified remote repositories: scala-tools.snapshots (http://scala-tools.org/repo-snapshots), scala-tools.releases (http://scala-tools.org/repo-releases), central (http://repo1.maven.org/maven2) Any ideas?

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• How do you prove your cleverness and programming skills?

  - by Sebi

  Lately, there were a lot of questions related to career planning and how to decide which languages to learn, how to learn new languages and so on. But I was thinking about a way, how do you will proof later that you're really learned something. Ok you can mentione it in your application for a job or in the interview, but by just stating that I was learning e.g. C++ at home, I don't think this will really be very sucessful. So some suggested to create something (homepage, application, whatsoever) to prove that you also can use these skills in practice. But still I'm not really sure if this will provide any benefit, because it would require a very special project to show all your skills and I don't think you can easily invent such a project (that sould also be useful). Others suggested to solve for example the Project Euler questions but still I'm not sure how this will be useful in career-planning. Are you going to mention at your job interview that you solved all this question in the company's favorite programming language?? :D I can't imagine. The reason why I'm asking is that I have some spare time and I would really like to learn some new programming languages (C++ and/or Python if this matters) and I'm looking for a smart way to do is while concurrently assure that it will be useful in my future career. (there are 3-4 companies id like to try to get a job andIi know all of them are using mainly C++/Pyhton...)

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• Pointing non-www to a spcific sub-directory

  - by Ben Sinclair

  I might be going about this all wrong so let me know if I am. I am creating software that allows people to sign up and have their own sub-domain on my website. So say my website is ben.com, they could have their own sub-domain called juice.ben.com. When they type their sub-domain juice.ben.com in their address bar, it will load the contents in a root directory. I have also set-up a .htaccess redirect to redirect www.ben.com to ben.com. Not sure if this matters with my question but I thought I'd mention it. Ok, so basically what I think I need to do is put the software they they've signed up to in the root directory. So when someone goes to juice.ben.com, they will be pointed to the root directory (I beleive I cans et-up wild card sub-domains with my host) and the software will then analyse their sub-domain and then display their account. Now, if someone just types in ben.com into their browser, I want it to show the contents of the ben.com/_website/ folder but still show in the address bar that they are still in the root directory. Hopefully I am making sense :) Is this possible with htaccess? If so, what do I need to do?

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• Sparse parameter selection using Genetic Algorithm

  - by bgbg

  Hello, I'm facing a parameter selection problem, which I would like to solve using Genetic Algorithm (GA). I'm supposed to select not more than 4 parameters out of 3000 possible ones. Using the binary chromosome representation seems like a natural choice. The evaluation function punishes too many "selected" attributes and if the number of attributes is acceptable, it then evaluates the selection. The problem is that in these sparse conditions the GA can hardly improve the population. Neither the average fitness cost, nor the fitness of the "worst" individual improves over the generations. All I see is slight (even tiny) improvement in the score of the best individual, which, I suppose, is a result of random sampling. Encoding the problem using indices of the parameters doesn't work either. This is most probably, due to the fact that the chromosomes are directional, while the selection problem isn't (i.e. chromosomes [1, 2, 3, 4]; [4, 3, 2, 1]; [3, 2, 4, 1] etc. are identical) What problem representation would you suggest? P.S If this matters, I use PyEvolve.

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• Writing an efficient cron job script utilizing Zend_Mail_Storage_Imap.

  - by fireeyedboy

  I'm new to the IMAP protocol and Zend_Mail_Storage and I'm writing a small php script for a cron job that should regularly poll an IMAP account and check for new messages, and send an e-mail if new messages have arrived. As you can imagine, I want to only poll the IMAP account for relevant messages, and I only want to send a new e-mail if new messages have arrived since the last polled new message. So I thought of keeping track of the last message I polled with some unique identifier for a message. But I'm a bit uncertain about whether the methods I want to utilize for this do what I expect them to do though. So my questions are: Does the iterator position of Zend_Mail_Storage_Imap actually resemble some IMAP unique identifier for messages, or is it simply only and internal position of Zend_Mail_Storage_Abstract? For instance, if I tell it to seek() to message 5 (which I stored from an earlier session) will it indeed seek to the appropriate message on the IMAP server, even if for instance messages have been deleted since last session? Would keeping track of this latest polled message id in a file suffice for a cron job that, say, polls the account every 5 or 10 minutes? Or is this too naive, and should I be using a database for instance. Or is there maybe a much easier way to keep track of such state with Zend_Mail_Storage_Abstract? Also, do I need to poll every IMAP folder? Or is everything accumulated when I poll INBOX? If you could shed some light on any of these matters, I'ld appreciate it. Thanks in advance.

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• jQuery scrollTop() doesn't seem to work in Safari or Chrome (Windows)

  - by Pointy

  I've got a simple setup to allow a "help"-style window to be loaded and scrolled to a particular point on the page. More or less the code looks like this: var target = /* code */; target.offsetParent().scrollTop(target.offset().top - fudgeValue); The target of the scroll and the fudge value are determined by a couple of hints dropped on the page, and I'm having no problems with that part of this mechanism anywhere. In Firefox and IE8, the above code works exactly like I want: the scrolled box (in this case, the page body) correctly scrolls the contained stuff to the right point in the window when it's told to do so. In Chrome and Safari, however, the call to scrollTop() apparently does nothing at all. All the numbers are OK, and the target refers to the right thing (and the offsetParent() is indeed the body element), but nothing at all happens. As far as I can tell from googling around, this is supposed to work. Is there something funny about the renderer under Safari and Chrome? This is jQuery 1.3.2 if that matters. Test page: http://gutfullofbeer.net/scrolltop.html

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• Selected Item in Dropdown Lists from Enum in ASP.net MVC

  - by AlexCuse

  Sorry if this is a dup, my searching turned up nothing. I am using the following method to generate drop down lists for enum types (lifted from here: http://addinit.com/?q=node/54): public static string DropDownList(this HtmlHelper helper, string name, Type type, object selected) { if (!type.IsEnum) throw new ArgumentException("Type is not an enum."); if(selected != null && selected.GetType() != type) throw new ArgumentException("Selected object is not " + type.ToString()); var enums = new List<SelectListItem>(); foreach (int value in Enum.GetValues(type)) { var item = new SelectListItem(); item.Value = value.ToString(); item.Text = Enum.GetName(type, value); if(selected != null) item.Selected = (int)selected == value; enums.Add(item); } return System.Web.Mvc.Html.SelectExtensions.DropDownList(helper, name, enums, "--Select--"); } It is working fine, except for one thing. If I give the dropdown list the same name as the property on my model the selected value is not set properly. Meaning this works: <%= Html.DropDownList("fam", typeof(EnumFamily), Model.Family)%> But this doesn't: <%= Html.DropDownList("family", typeof(EnumFamily), Model.Family)%> Because I'm trying to pass an entire object directly to the controller method I am posting to, I would really like to have the dropdown list named for the property on the model. When using the "right" name, the dropdown does post correctly, I just can't seem to set the selected value. I don't think this matters but I am running MVC 1 on mono 2.6

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• LINQ2SQL - Binding result to a grid - want changes to be reflected without re-binding?

  - by Isaac

  Hello, I have a grid (DevExpress XtraGrid, if that matters) which is bound to a LINQ to SQL Entity property. gridItems.DataSource = purchaseOrder.PendingItemsGrouped; Well, the grid is being displayed properly,and I can see the purchase items that are pending. The problem arises when purchaseOrder.PendingItemsGrouped gets changed ... once that happens, the grid does not reflect the changes. The exact procedure is as following: The user selects a row from the grid, inserts a serial number on a specific textbox, and then hits enter effectively receiving this item from the purchase order, and inserting it into stock. inventoryWorker.AddItemToStock( userSelectedItem, serialNumber ); The item gets properly inserted to the inventory, but the grid still shows the item as if it is still awaiting it to be received. How do I solve this problem? Do I really need to re-bind the grid so the changes can be reflected? I even tried instead of: gridItems.DataSource = ...; This: gridItems.DataBindings.Add( new Binding( "DataSource", purchase, "PendingItemsGrouped" ) ); But couldn't solve the problem. Thank you very much for your time, Isaac. OBS: Re-Binding the Grid works, but my question is ... is that even the proper way of doing things? I feel like I'm miles off the right track.

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• Nunit Relative Path failing

  - by levi.siebens

  I'm having an issue with Nunit where I cannot find an image file when I run my tests and each time it looks for images it looks in the Nunit folder instead of looking inside the folder where the binary resides. Below is a detailed description of what's happening. I'm building a binary that is under test which contains the definition for some game elements and png files which will define the sprites I'm using (for sanity sake call it Binary1) Nunit runs tests from a seperate binary (Binary1Test) executing test methods against the first binary (Binary1). All tests pass, unless the test executes code in Binary1 which then requires Binary1 to use one of the image files (which are defined via a relative path). When the method is called, Nunit throws a file not found exception stating that it cannot find the file and states it's looking inside of the Program Files\Nunit.net 2.0 folder So I have no idea why the code is doing this, and to make matters more confusing when I pull up Enviornment.CurrentDirectory it gives me the correct path (the path to my debug folder) and not the path to nunit. Also if I use this instead of using the relative path, my tests will run without issue. So my question is, does anyone know why in the case of loading relative paths from within my binary that nunit decides to use it's directory instead of the directory where the binary is located and where the images are stored? Thanks.

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• PDFView printWithInfo:autoRotate: fails

  - by Brian Postow

  I'm trying to print a PDFDocument that I am constructing from a series of images. In case it matters, I'm doing all of this from within a Mozilla plugin. I create the PDFDocument, and put it into a PDFView, then I call [printView printWithInfo: [NSPrintInfo sharedPrintInfo] autoRotate: YES]; The print dialog comes up (as a separate window, instead of panel. I assume that that comes from being inside a mozilla window, so I wasn't too worried about it. The dialog shows my document, and I can page through it correctly, and everything looks good. However, when I hit "Print" the dropdown with "Layout" etc becomes empty, and the view under that becomes empty. The window doesn't disappear, and the document doesn't print. Hitting Cancel does exactly the same thing. The only thing I can do then is force-quit Mozillla. I based the program off of PDFKitLinker2 from the apple dev site, and that program works. But I can't see any significant differences between it and my version. Any suggestions on where to look? thanks. EDIT: Yes, I know that this is pretty much an exact duplicate of http://stackoverflow.com/questions/2058501/printing-off-screen-pdfviews but that never got a sufficient answer... (And I didn't notice it until just now...)

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• Beginner question - Loop invariants (Specifically Ch.3 of "Accelerated C++")

  - by Owen

  Hi - as I said, a complete beginner question here. I'm currently working my way through "Accelerated C++" and just came across this in chapter 3: // invariant: // we have read count grades so far, and // sum is the sum of the first count grades while (cin >> x) { ++count; sum += x; } The authors follow this by explaining that the invariant needs special attention paid to it because when the input is read into the variable x, we will have read count+1 grades and thus the invariant will be untrue. Similarly, when we have incremented the counter, the variable sum will no longer be the sum of the last count grades (in case you hadn't guessed, it's the traditional program for calculating student marks). What I don't understand is why this matters. Surely for just about any other loop, a similar statement would be true? For example, here is the book's first while loop (the output is filled in later): // invariant: we have written r rows so far while (r != rows) { // write a row of output std::cout << std::endl; ++r; } Once we have written the appropriate row of output, surely the invariant is false until we have incremented r, just as in the other example? It's probably something really obvious, anyone could enlighten me as to what makes these two cases different, that'd be great - and thanks in advance for taking the time to answer such a complete novice question. Owen

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• Environment variable names with parentheses, like %ProgramFiles(x86)%, in PowerShell?

  - by jwfearn

  How does one get the value of environment variable whose name contains parentheses in a PowerShell script? To complicate matters, some variables names contains parentheses while others have similar names without parenteses. For example (using cmd.exe): C:\>set | find "ProgramFiles" CommonProgramFiles=C:\Program Files\Common Files CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files ProgramFiles=C:\Program Files ProgramFiles(x86)=C:\Program Files (x86) We see that %ProgramFiles% is not the same as %ProgramFiles(x86)%. My PowerShell code is failing in a weird way because it's ignoring the part of the environment variable name after the parentheses. Since this happens to match the name of a different, but existing, environment variable I don't fail, I just get the right value of the wrong variable. Here's a test function in the PowerShell scripting language to illustrate my problem: function Do-Test { $ok = "C:\Program Files (x86)" # note space between 's' and '( $bad = "$Env:ProgramFiles" + "(x86)" # uses %ProgramFiles% $bin32 = "$Env:ProgramFiles(x86)" # LINE 6, I want to use %ProgramFiles(x86)% if ( $bin32 -eq $ok ) { Write-Output "Pass" } elseif ( $bin32 -eq $bad ) { Write-Output "Fail: %ProgramFiles% used instead of %ProgramFiles(x86)%" } else { Write-Output "Fail: some other reason" } } And here's the output: PS> Do-Test Fail: %ProgramFiles% used instead of %ProgramFiles(x86)% Is there a simple change I can make to line 6 above to get the correct value of %ProgramFiles(x86)%? *NOTE: In the text of this post I am using batch file syntax for environment variables as a convenient shorthand. For example %SOME_VARIABLE% means "the value of the environment variable whose name is SOME_VARIABLE". If I knew the properly escaped syntax in PowerShell, I wouldn't need to ask this question.*

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• How Can I Prevent Memory Leaks in IE Mobile?

  - by Jake Howlett

  Hi All, I've written an application for use offline (with Google Gears) on devices using IE Mobile. The devices are experiencing memory leaks at such a rate that the device becomes unusable over time. The problem page fetches entries from the local Gears database and renders a table of each entry with a link in the last column of each row to open the entry ( the link is just onclick="open('myID')" ). When they've done with the entry they return to the table, which is RE-rendered. It's the repeated building of this table that appears to be the problem. Mainly the onclick events. The table is generated in essence like this: var tmp=""; for (var i=0; i<100; i++){ tmp+="<tr><td>row "+i+"</td><td><a href=\"#\" id=\"LINK-"+i+"\""+ " onclick=\"afunction();return false;\">link</a></td></tr>"; } document.getElementById('view').innerHTML = "<table>"+tmp+"</table>"; I've read up on common causes of memory leaks and tried setting the onclick event for each link to "null" before re-rendering the table but it still seems to leak. Anybody got any ideas? In case it matters, the function being called from each link looks like this: function afunction(){ document.getElementById('view').style.display="none"; } Would that constitute a circular reference in any way? Jake

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• How bad is code using std::basic_string<t> as a contiguous buffer?

  - by BillyONeal

  I know technically the std::basic_string template is not required to have contiguous memory. However, I'm curious how many implementations exist for modern compilers that actually take advantage of this freedom. For example, if one wants code like the following it seems silly to allocate a vector just to turn around instantly and return it as a string: DWORD valueLength = 0; DWORD type; LONG errorCheck = RegQueryValueExW( hWin32, value.c_str(), NULL, &type, NULL, &valueLength); if (errorCheck != ERROR_SUCCESS) WindowsApiException::Throw(errorCheck); else if (valueLength == 0) return std::wstring(); std::wstring buffer; do { buffer.resize(valueLength/sizeof(wchar_t)); errorCheck = RegQueryValueExW( hWin32, value.c_str(), NULL, &type, &buffer[0], &valueLength); } while (errorCheck == ERROR_MORE_DATA); if (errorCheck != ERROR_SUCCESS) WindowsApiException::Throw(errorCheck); return buffer; I know code like this might slightly reduce portability because it implies that std::wstring is contiguous -- but I'm wondering just how unportable that makes this code. Put another way, how may compilers actually take advantage of the freedom having noncontiguous memory allows? Oh: And of course given what the code's doing this only matters for Windows compilers.

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• C++ Exceptions and Inheritance from std::exception

  - by fbrereto

  Given this sample code: #include <iostream> #include <stdexcept> class my_exception_t : std::exception { public: explicit my_exception_t() { } virtual const char* what() const throw() { return "Hello, world!"; } }; int main() { try { throw my_exception_t(); } catch (const std::exception& error) { std::cerr << "Exception: " << error.what() << std::endl; } catch (...) { std::cerr << "Exception: unknown" << std::endl; } return 0; } I get the following output: Exception: unknown Yet simply making the inheritance of my_exception_t from std::exception public, I get the following output: Exception: Hello, world! Could someone please explain to me why the type of inheritance matters in this case? Bonus points for a reference in the standard.

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• persistence.xml ignores Hibernate and chooses DataNucleus

  - by iNPUTmice

  Hi, I'm toying around with GWT (dunno if this matters) and Hibernate. I've created a a file persistence.xml in META-INF with (amoung) other configuration the line: org.hibernate.ejb.HibernatePersistence But when I startup the EntityManager it chooses DataNucleus instead of Hibernate (which later fails because it isnt installed (jar are not in the class path)) Java Code is: EntityManagerFactory factory = Persistence.createEntityManagerFactory("gwt"); EntityManager em =factory.createEntityManager(); EntityTransaction transacation = em.getTransaction(); transacation.begin(); Campaign campaign = new Campaign(); campaign.setName("Test"); em.persist(campaign); transacation.commit(); config file contains: <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="gwt" transaction-type="JTA"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <jta-data-source>java:/DefaultDS</jta-data-source> <properties> ...

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• Proper use of HTTP status codes in a "validation" server

  - by Romulo A. Ceccon

  Among the data my application sends to a third-party SOA server are complex XMLs. The server owner does provide the XML schemas (.xsd) and, since the server rejects invalid XMLs with a meaningless message, I need to validate them locally before sending. I could use a stand-alone XML schema validator but they are slow, mainly because of the time required to parse the schema files. So I wrote my own schema validator (in Java, if that matters) in the form of an HTTP Server which caches the already parsed schemas. The problem is: many things can go wrong in the course of the validation process. Other than unexpected exceptions and successful validation: the server may not find the schema file specified the file specified may not be a valid schema file the XML is invalid against the schema file Since it's an HTTP Server I'd like to provide the client with meaningful status codes. Should the server answer with a 400 error (Bad request) for all the above cases? Or they have nothing to do with HTTP and it should answer 200 with a message in the body? Any other suggestion? Update: the main application is written in Ruby, which doesn't have a good xml schema validation library, so a separate validation server is not over-engineering.

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• javascript - catch SyntaxError and run alternate function

  - by ludicco

  Hello there, I'm trying to build something on javascript that I can have an input that can be everything like string, xml, javascript and (non-javascript string without quotes) as follows: //strings eval("'hello I am a string'"); /* note the following proper quote marks */ //xml eval(<p>Hello I am a XML doc</p>); //javascript eval("var hello = 2+2;"); So this first 3 are working well since they are simple javascript native formats but when I try use this inside javascript //plain-text without quotes eval("hello I am a plain text without quotes"); //--SyntaxError: missing ; before statement:--// Obviously javascript interprets this as syntax error because it thinks its javascript throwing a SyntaxError. So what I would like to do it to catch this error and perform the adjustment method if this occurs. I've already tried with try catch but it doesn't work since it keeps returning the Syntax error as soon as it tries to execute the code. Any help would be much appreciated Cheers :) Additional Information: Imagine an external file that javascript would read, using spidermonkey, so it's a non-browser stuff(I can't use HttpRequest, DOM, etc...)..not sure if this matters, but there it is. :)

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• Are Subversion 1.6 & Xcode 3.2 compatible?

  - by Meltemi

  Trying to get Xcode to work with Subversion server. Server: Subversion upgraded to 1.6.9 (Mac OS X Leopard 10.5.8) Client: Xcode 3.2.1 (Snow Leopard 10.6.2 with Subversion 1.6.5 though not sure that matters) Repository on server is setup and working fine via command line. However, I get an error when trying to create the Repository connection in Xcode: Error: 160043 (Unsupported FS format) Description: Expected FS format '2'; found format '4' a Google search seems to say that the server needs to be updated...but it's running 1.6.9 which is the most current version I'm aware of. Anyone know how to make this work? Is it even possible? I'm well aware of the command line usage but I would like to get Xcode & SVN talking... Revisiting this after some time: Using command line: username$ svn+ssh://hostname/Library/Subversion/Repository/test yields the same result: Description: Expected FS format '2'; found format Can anyone verify that I need to upgrade Subversion on the client machine to match version on server (1.6.9)?!? was hoping i wouldn't have to unless it was a "major" revision (ie. 1.5.x - 1.6.x)

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• ASP.NET Sql Timeout

  - by Petoj

  Well we have this Asp.Net application that we installed at a customer but now some times we get a SqlException that says "Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding." now the wired thing is that the exception comes instantly when i press the button, this does not happen every time i press the button so its random.. any idea what i could try to pinpoint the problem? We are using the EnterpriseLibrary Database block if that matters... Stack trace: at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlDataReader.ConsumeMetaData() at System.Data.SqlClient.SqlDataReader.get_MetaData() at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) at Microsoft.Practices.EnterpriseLibrary.Data.Database.DoExecuteReader(DbCommand command, CommandBehavior cmdBehavior) at Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command)

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