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• Simple question - XSB Prolog

  - by KP65

  Hello! I'm diving into the world of prolog headfirst but I seem to have hit shallow water! I'm looking at database manipulation in prolog with regards to this tutorial:Learn Prolog Now! It states that I can see my database by entering listing So i tried it and it should basically output everything in my .P file(facts, rules), but this is what i get, here are my sequence of commands: ? consult('D:\Prolog\testfile.P'). [testfile.P loaded] ? listing. library_directory(C:blahblahpathtoXSB) library_directory(C:blahblahXSBpath) {this is listed around 5 times)} shouldn't this command display what is in testfile.P, according to the tutorial? also, after consult testfile.P i should be ableto use assert to add more facts but it doesnt actually change anything in the testfile.P..? any ideas

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• jQuery prevent paste to iframe designmode from MS Word

  - by naugtur

  I've seen some questions on catching the paste event. This looks helpful. But I want to prevent paste on a designmode iframe from happening when the pasted content is not plaintext, but comes from MS Word or other WYSIWYG editor. What is experience on that? I suppose I should catch the event (bind to iframe or to its body?) and look for some specific tags in the clipboard. What content does Internet Explorer add every time? [edit] After doing more research I see there is no easy way to work with clipboard in non Internet Explorer browser except some Flash tricks. I don't want them. How can I detect paste in Firefox and others then?

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• UITextField in UITableView to becomeFirstResponder.

  - by f0rz

  Hi ! I have a problem which I dont have a clue how to work around. Maybe anyone of you could help me to the correct directions... Simple I have a UITableView with each cell containing a UITextField. When I´m editing a cell (UITextField) and hit Return Key, a new row is inserted under the current cell. After that I reloadData on the TableView, the new row is showed. Everything is OK here. Now to my problem, I want to [UITextField becomeFirstResponder] on the newest added row. But I could not find anyway to accomplish this. I could post code but didn't find that necessary. Cheers.

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• MVC4 bundling GZIP and headers

  - by plurby

  I'm testing my site with Google PageSpeed and YSlow and the bundles that i've created with MVC4 bundles aren't getting Gzipped (Compressing resources with gzip or deflate can reduce the number of bytes sent over the network) and there is no Vary: Accept-Encoding header (Instructs proxy servers to cache two versions of the resource: one compressed, and one uncompressed. This helps avoid issues with public proxies that do not detect the presence of a Content-Encoding header properly.) And also how can i add encoding header for the whole scripts folder on the ISS. I know there is HTTP Response Headers, then Add Custom HTTP Response Header, but will this work on the whole scripts folders and subfolders and what to put in the Name and Value fields. How can this be solved. Regards.

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• How to edit a link within a contentEditable div

  - by Travis

  Does anyone have any suggestions on how to edit an link in a contentEditable div? It would be ideal once the link is either clicked with mouse, or the cursor hits the link, that the a small prompt would pop up and allow the user to change the href property of the link. The prompt isn't the issue, but how is it possible to detect the link has been either clicked or that the cursor has arrived at the link? onfocus doesn't seem to work in a contentEditable div on Firefox & Safari. Any ideas?

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• C# inheritance XmlSerializer

  - by ikurtz

  greetngs, i have two classes: [Serializable] public class FireGridUnit { public GridUnit FireGridLocation { get; set; } } [Serializable] public class FireResult: FireGridUnit { public bool Hit { get; set; } public bool ShipDestroyed { get; set; } public Ship.ValidShips DestroyedShipType {get; set;} public bool Win { get; set; } } as you see FireResult inherits FireGrdUnit. in my code when i try to use them i get a runtime error: Unable to cast object of type 'NietzscheBattleships.FireGridUnit' to type 'NietzscheBattleships.FireResult'. is this because if i am serializing the class has to be independant ie not be inherited? many thanks.

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• Can a struct become deallocated?

  - by brettr

  I've declared a struct in my header file like this: typedef struct { NSString *department; NSString *departmentId; } Department; Department currentDepartment; This struct is in a fairly simple class. I assign the struct values in viewDidLoad. Just before leaving viewDidLoad, I see the struct values are still there. After the user clicks a segment control, I reassign the struct values. Before assigning values, I see the two struct values are 0x0. I do have NSZombieEnabled, which is printing out this when I mouse over the struct while the app is running and one of my breakpoints have been hit: MyApp[25722:207] *** -[CFString _cfTypeID]: message sent to deallocated instance 0xfc0e90 I'm not creating an instance of the struct or deallocating it. How can it be getting deallocated?

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• Why shouldn't I always use nullable types in C#.

  - by Matthew Vines

  I've been searching for some good guidance on this since the concept was introduced in .net 2.0. Why would I ever want to use non-nullable data types in c#? (A better question is why wouldn't I choose nullable types by default, and only use non-nullable types when that explicitly makes sense.) Is there a 'significant' performance hit to choosing a nullable data type over its non-nullable peer? I much prefer to check my values against null instead of Guid.empty, string.empty, DateTime.MinValue,<= 0, etc, and to work with nullable types in general. And the only reason I don't choose nullable types more often is the itchy feeling in the back of my head that makes me feel like it's more than backwards compatibility that forces that extra '?' character to explicitly allow a null value. Is there anybody out there that always (most always) chooses nullable types rather than non-nullable types? Thanks for your time,

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• COM port cannot be opened in asp.net

  - by Pandiya Chendur

  I following this article for sending SMS it is a winform application.. I have referenced all the Dll's to my asp.net application..... I use an aspx page to detect a mobile device connected to a PC..... But it alwys shows COM 'n' Port could not be opened..... using SMS; using GsmComm.GsmCommunication; using GsmComm.PduConverter; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { GsmCommMain comm = new GsmCommMain(6, 9600, 300); comm.Open(); if (!comm.IsConnected()) { Response.Write("No Phone Connected"); } else { SmsSubmitPdu pdu = new SmsSubmitPdu("test", "+919999999999", ""); CommSetting.comm.SendMessage(pdu); } } }

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• _mask and Rails

  - by Eric Koslow

  So I am trying to get the cancan gem to work with my rails 3 app and I've hit a problem. I tried to copy the code that Ryan Bates (the creator of the gem) used in his screen cast, but I get an error saying that roles_mask is not a method. I figure that the _mask method was removed from Ruby/Rails at some point, and I'm now wondering what is the replacement. Here's the code in my user.rb model: named_scope :with_role, lambda { |role| {:conditions => "roles_mask & #{2**ROLES.index(role.to_s)} > 0 "} } ROLES = %w[admin student principal admissions] def roles=(roles) self.roles_mask = (roles & ROLES).map { |r| 2**ROLES.index(r) }.sum end def roles ROLES.reject { |r| ((roles_mask || 0) & 2**ROLES.index(r)).zero? } end def role? roles.include? role.to_s end def role_symbols roles.map(&:to_sym) end I'm using Rails 3 and Ruby 1.9.2dev Thank you

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• Invalid UTF-8 for Postgres, Perl thinks they're ok

  - by gorilla

  I'm running perl 5.10.0 and Postgres 8.4.3, and strings into a database, which is behind a DBIx::Class. These strings should be in UTF-8, and therefore my database is running in UTF-8. Unfortunatly some of these strings are bad, containing malformed UTF-8, so when I run it I'm getting an exception DBI Exception: DBD::Pg::st execute failed: ERROR: invalid byte sequence for encoding "UTF8": 0xb5 I thought that I could simply ignore the invalid ones, and worry about the malformed UTF-8 later, so using this code, it should flag & ignore the bad titles. if(not utf8::valid($title)){ $title="Invalid UTF-8"; } $data->title($title); $data->update(); However perl seems to think that the strings are valid, but it still throws the exceptions. How can I get perl to detect the bad UTF-8?

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• Intercept UITableView scroll touches

  - by Jonesy

  Is it possible to control when the UITableView scrolls in my own code. I am trying to get behaviour where a vertical swipe scrolls and a horizontal swipe gets passed through to my code (of which there are many example) BUT I want a DIAGONAL swipe to do nothing, i.e the UITableView should not even begin scrolling. I tried catching it in here - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView but the scrollView.contentOffset.x is always 0 so I cannot detect a horizontal movement. I also tried subclassing UITableView and implementing - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event etc.. but the UITableView (and I guess it's parent UIScrollView) start to scroll before the touches are notified? To re-iterate, I want the UITableView scrolling to be locked if a diagonal swipe is made, but to scroll vertically normally. (This behaviour can be seen in Tweetie(Twitter) for the iPhone) Thanks for any help!

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• Where to mention Accessdenied page in form Authentication

  - by Muhammad Akhtar

  I have implement Form Authentication <location path="Admin"> <system.web> <authorization> <deny users="?"/> <allow roles="Admin" /> <deny roles="systemAdmin"/> </authorization> </system.web> </location> Since in above mentioned rights, Admin can have access to Admin folder and systemAdmin can't have. I have make custom Accessdenied page where I am showing message to user he has not permission to access this page Now the issue is, If systemAdmin try to hit Admin folder page, he will be redirected to AccessDenied.apsx page. (please Note: both user are authenticated, 1 user have permission to some folder and other user have permission to other folder. I don't want to put check in each page) where to specify accessdenied page redirection ? Thanks

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• iPhone Foundation - performance implications of mutable and xxxWithCapacity:0

  - by Adam Eberbach

  All of the collection classes have two versions - mutable and immutable, such as NSArray and NSMutableArray. Is the distinction merely to promote careful programming by providing a const collection or is there some performance hit when using a mutable object as opposed to immutable? Similarly each of the collection classes has a method xxxxWithCapacity, like [NSMutableArray arrayWithCapacity:0]. I often use zero as the argument because it seems a better choice than guessing wrongly how many objects might be added. Is there some performance advantage to creating a collection with capacity for enough objects in advance? If not why isn't the function something like + (id)emptyArray?

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• clicking the debug button in Eclipse will not start debug mode

  - by iHorse

  i am running Eclipse 3.5.0 on a MacBook Pro using the Android SDK. i noticed that on this particular project i am working on i cant seem to actually enter debug mode. i click the little green bug icon in the tool bar and the app starts and runs. but if i switch over to the Debug Perspective i see no indication that it is running in debug mode. furthermore i can not hit any brake points that i have set. this makes debugging code a bit hard. Other projects that i am working on don't have this issue. any ideas on what i need to change in the project to get this to work?

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• Android, simply view question about view reset

  - by javano

  I have a button in my activity, when you click the button an if statement is ran against its text label; if(BTN_1.getText()=="firsttext"){ //do some stuff, then... BTN_1.setText("secondtext"); }else if(BTN_1.getText()=="secondtext"){ //do other stuff, then... BTN_1.setText("firsttext"); } Firstly, if I hit the home button and go back to the desktop and then click back onto my app the view has reset its self; if I press the button and leave it in a state where the text of the button is "secondtext", when I return to my app it says "firsttext", how can I stop the view of my app refreshing its self like this? Secondly, under my XML layout I have defined the buttons text; android:text="firsttext" But this won't actually match my if statement above, under onCreate of this app I have: BTN_CONNECT.setText("Connect"); But visually the text of the button is exactly the same, why won't it match? Thanks for reading :)

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• How can I set up .NET UnhandledException handling in a Windows service?

  - by Mike Pateras

  protected override void OnStart(string[] args) { AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); Thread.Sleep(10000); throw new Exception(); } void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) { } I attached a debugger to the above code in my windows service, setting a breakpoint in CurrentDomain_UnhandledException, but it was never hit. The exception pops up saying that it is unhandled, and then the service stops. I even tried putting some code in the event handler, in case it was getting optimized away. Is this not the proper way to set up unhandled exception handling in a windows service?

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• Put DrawingGroup on a Canvas?

  - by stefan.at.wpf

  Hello, I have a DrawingGroup and I want to put it on a Canvas, but because DrawingGroup is no UIElement, this is not possible. Whats the best way to do this? And from which class could I derive, so that I could do something like canvas1.Children.Add(new myDrawingGroup()); (Meaning I want to add my DrawingGroup as one element on the canvas, instead of several single Drawings / Geometries. I also need hit testing and databinding support.) Thank you very much for any hint!

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• Ever any performance different between Java >> and >>> right shift operators?

  - by Sean Owen

  Is there ever reason to think the (signed) and (unsigned) right bit-shift operators in Java would perform differently? I can't detect any difference on my machine. This is purely an academic question; it's never going to be the bottleneck I'm sure. I know: it's best to write what you mean foremost; use for division by 2, for example. I assume it comes down to which architectures have which operations implemented as an instruction.

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• UnitTest++ constructing fixtures multiple times?

  - by Peter

  I'm writing some unit tests in UnitTest++ and want to write a bunch of tests which share some common resources. I thought that this should work via their TEST_FIXTURE setup, but it seems to be constructing a new fixture for every test. Sample code: #include <UnitTest++.h> struct SomeFixture { SomeFixture() { // this line is hit twice } }; TEST_FIXTURE(SomeFixture, FirstTest) { } TEST_FIXTURE(SomeFixture, SecondTest) { } I feel like I must be doing something wrong; I had thought that the whole point of having the fixture was so that the setup/teardown code only happens once. Am I wrong on this? Is there something else I have to do to make it work that way?

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• Back button loop with IFRAMES

  - by Tim Jackson

  In my (school) website we use Iframes to display class blogs (on blogger). This works well EXCEPT if the user then clicks on (say) a photo inside the iframe. Blogger (in this case) then displays the photo in the whole browser window and the back button loops; that is if the back button is hit, the browser (IE, FF, Chrome) stays on the same page. The only way out is for the user to jump back two pages (which many of our users don't know how to do). I've read a lot of posts on back buttons and iframes and there doesn't appear to be a simple solution. Bear in mind that I don't have control over the iframe content (so no embedded back buttons in the frame are possible). Ideas anyone?

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• UDF call in entity framework is cached

  - by Fred Yang

  I am doing a test after reading an article http://blogs.msdn.com/alexj/archive/2009/08/07/tip-30-how-to-use-a-custom-store-function.aspx about udf function called. When I use a function with objectContext.Entities.Where( t= udf(para1, para2) == 1), here the Entities is not ObjectQuery, but an ObjectSet, the first time I call the method, it runs correctly, if I reuse the objectContext,and run it again but with different para1, para2, then the previous parameter values still cached, and the result is same as previous one, which is wrong. The sql profiler shows that both query hit the database, but the t-sql is the same. Am I missing something? And the ObjectSet does not support .where(esql_string). How to get udf working with ObjectSet? Thanks Fred

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• Is detecting scrollbar presence with jQuery still difficult?

  - by donpal

  I know that detecting scrollbar presence is supposed to be one of those illusive things that we should all have to suffer through. What I've read so far is that you can't really detect scrollbar presence, only use hints in the DOM to know if they may be present, and it can't be done in less than 30 lines of code. This sounds a little impossible to me now that we're in 2010. Does jQuery have a cross-browser reliable solution that takes care of this and works at least most of the time? Any help please, I'm pulling my hair, half of it is already on the floor.

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• How to display image in grails GSP?

  - by Walter

  I'm still learning Grails and seem to have hit a stumbling block. Here are the 2 domain classes: class Photo { byte[] file static belongsTo = Profile } class Profile { String fullName Set photos static hasMany = [photos:Photo] } The relevant controller snippet: class PhotoController { ..... def viewImage = { def photo = Photo.get( params.id ) byte[] image = photo.file response.outputStream << image } ...... } Finally the GSP snippet: <img class="Photo" src="${createLink(controller:'photo', action:'viewImage', id:'profileInstance.photos.get(1).id')}" /> Now how do I access the photo so that it will be shown on the GSP? I'm pretty sure that profileInstance.photos.get(1).id is not correct. Thanks!!

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• How can I have HTML tab expansion in ST2 w/ Emmet inside Handlebars templates(emberjs)?

  - by Zuko

  Okay, so I'm using Sublime Text 2 with Emmet. But "Tab" expansion of HTML snippets doesn't work inside a script because of the scope. Example: In HTML, I can type "h1" and then hit tab, and it will generate "" When using Ember.js, and more specifically Handlebars, it doesn't work. <script type="text/x-handlebars"> h1 </script> Pressing tab after that "h1" doesn't expand it because it's inside a script; Emmet turns this off. I can press Ctrl+E, which is the "expand anywhere" hotkey, and that works just fine. However, that is uncomfortable and prone to missing and hitting things like Ctrl+S or Ctrl+D which have undesired effects. So, how can I change this? I tweeted at the developer, and got a reply, https://twitter.com/chikuyonok/status/398708331969540096 But couldn't understand what to do.

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