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• WPF - Handling a RoutedEvent in the parent for a specfic control instance

  - by empo

  In my user control I have several textboxes e.g. Textbox1, Textbox2. In the parent I only want to handle KeyDown events raised from Textbox1, not all Textbox I have added a handler in the parent this.AddHandler(TextBox.KeyDownEvent, new RoutedEventHandler(OnTextboxGoToPageKeyDown)); but of course this will handle all KeyDown events which I don't want. Do I have to add some conditional logic in the RoutedEventHandler to check where the event was raised from? or is there a better way? What's the best way to do this? Thanks.

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• IncludeExceptionDetailInFaults not behaving as thought

  - by pdiddy

  I have this simple test project just to test the IncludeExceptionDetailInFaults behavior. public class Service1 : IService1 { public string GetData(int value) { throw new InvalidCastException("test"); return string.Format("You entered: {0}", value); } } [ServiceContract] public interface IService1 { [OperationContract] string GetData(int value); } In the app.config of the service i have it set to true <serviceDebug includeExceptionDetailInFaults="True" /> On the client side: try { using (var proxy = new ServiceReference1.Service1Client()) Console.WriteLine(proxy.GetData(5)); } catch (Exception ex) { Console.WriteLine(ex.Message); } This is what I thought the behavior was: Setting to includeExceptionDetailInFaults=true would propagate the exception detail to the client. But I'm always getting the CommunicationObjectFaultException. I did try having the FaultContract(typeof(InvalidCastException)) on the contract but same behavior, only getting the CommunicationObjectFaultException. The only way to make it work was to throw new FaultException(new InvalidCastException("test")); But I thought with IncludeExceptionDetailInFaults=true the above was done automatically. Am I missing something?

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• ASP.NET MVC - creating and handling with URLs with Greater Than and Less Than characters

  - by pcampbell

  Consider a link to a page for a user's profile. A page is creating that URL like this: //Model.Name has value "<bad guy>" Html.ActionLink("foo, "ViewUser", new { id=5, title=Url.Encode(Model.Name) }) The actual outcome was http://mysite/Users/5/%253cbad%2guy%253e When navigating to that URL, the server generates a HTTP Error 400 - Bad Request. Question: Given that the Model.Name may contain Unicode characters, or characters otherwise illegal in URLs, what's the best way to strip out illegal characters, or otherwise encode them? The problem surfaces when testing out 'interesting' user inputs with < and >, but anything could come from the user, and therefore be put in a URL by way of Model.Name.

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• Simple javascript to mimic jQuery behaviour of using this in events handlers

  - by Marco Demaio

  This is not a question about jQuery, but about how jQuery implements such a behaviour. In jQuery you can do this: $('#some_link_id').click(function() { alert(this.tagName); //displays 'A' }) could someone explain in general terms (no need you to write code) how do they obtain to pass the event's caller html elments (a link in this specific example) into the this keyword? I obviously tried to look 1st in jQuery code, but I could not understand one line. Thanks!

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• javascript class calling XMLHttpRequest internally, then handling onreadystatechange

  - by Radu M

  this thing almost works: function myClass(url) { this.source = url; this.rq = null; this.someOtherProperty = "hello"; // open connection to the ajax server this.start = function() { if (window.XMLHttpRequest) { this.rq = new XMLHttpRequest(); if (this.rq.overrideMimeType) this.rq.overrideMimeType("text/xml"); } else this.rq = new ActiveXObject("Microsoft.XMLHTTP"); try { this.rq.onreadystatechange = connectionEvent; this.rq.open("GET", this.source, true); this.rq.send(null); this.state = 1; } catch (err) { // some error handler here } } function connectionEvent() { alert("i'm here"); alert("this doesnt work: " + this.someOtherProperty); } } // myClass so it's nothing more than having the XMLHttpRequest object as a member of my class, instead of globally defined, and invoking it in the traditional way. however, inside my connectionEvent callback function, the meaning of "this" is lost, even though the function itself is scoped inside myClass. i also made sure that the object that i instantiate from myClass is kept alive long enough (declared global in the script). in all the examples of using javascript classes that i saw, "this" was still available inside the inner functions. for me, it is not, even if i take my function outside and make it a myClass.prototype.connectionEvent. what am i doing wrong? thank you.

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• Java: error handling with try-catch, empty-try-catch, dummy-return

  - by HH

  A searh uses recursively defined function that easily throws exceptions. I have tried 3 ways to handle exeptions: to ignore with an empty-try-catch() add-dummy-return stop err-propagation due to exeption throw a specific except. (this part I don't really understand. If I throw except, can I force it to continue elsewhere, not continuing the old except-thrown-path?) Some exceptions I do not realy care like during execution removed files -exception (NullPointer) but some I really do like unknown things. Possible exceptions: // 1. if a temp-file or some other file removed during execution -> except. // 2. if no permiss. -> except. // 3. ? --> except. The code is Very import for the whole program. I earlier added clittered-checks, try-catches, avoided-empty-try-catches but it really blurred the logic. Some stoned result here would make the code later much easier to maintain. It was annoying to track random exeptions due to some random temp-file removal! How would you handle exceptions for the critical part? Code public class Find { private Stack<File> fs=new Stack<File>(); private Stack<File> ds=new Stack<File>(); public Stack<File> getD(){ return ds;} public Stack<File> getF(){ return fs;} public Find(String path) { // setting this type of special checks due to errs // propagation makes the code clittered if(path==null) { System.out.println("NULL in Find(path)"); System.exit(9); } this.walk(path); } private void walk( String path ) { File root = new File( path ); File[] list = root.listFiles(); //TODO: dangerous with empty try-catch?! try{ for ( File f : list ) { if ( f.isDirectory() ) { walk( f.getAbsolutePath() ); ds.push(f); } else { fs.push(f); } } }catch(Exception e){e.printStackTrace();} } } Code refactored from here.

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• How and where do we write try catch block to handle Exception

  - by Arpita

  We are using C# language to develope a Windows application. Our windows application consists of three layers (UI,Business and DataAccess layer). In Business Layer there are some public (business) methods through which UI communicates wilh Business layer classes. These public methods also have some private methods to implement the required functionality. There are some methods in DataAcess layer which are called from Business layer class. In this situatuion where should i wrte try-catch? a) In Business Layer Public methods b) In Busyness Layer Private methods c) In DataAccess Layer methods d) In UI methods from where Business methods are called.

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• How can I catch for a connection timeout error in Python's SMTPlib?

  - by ensnare

  The error being thrown is: error: [Errno 110] Connection timed out I'm not sure what to except for? Thanks.

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• NHibernate handling mutliple resultsets from a sp call

  - by Michael Baldry

  I'm using a stored procedure to handle search on my site, it includes full text searching, relevance and paging. I also wanted it to return the total number of results that would have been returned, had paging not being there. So I've now got my SP returning 2 select statements, the search and just SELECT @totalResults. Is there any way I can get NHibernate to handle this? I'm currently accessing the ISession's connection, creating a command and executing the SP myself, and mapping the results. This isn't ideal, so I'm hoping I can get NH to handle this for me. Or if anyone has any other better ways of creating complicated searches etc with NH, I'd really like to hear it.

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• Java Runtime Exception

  - by ikurtz

  when i run my application i get the following error: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.text.FlowView$FlowStrategy.layoutRow(FlowView.java:546) at javax.swing.text.FlowView$FlowStrategy.layout(FlowView.java:460) at javax.swing.text.FlowView.layout(FlowView.java:184) at javax.swing.text.BoxView.setSize(BoxView.java:380) at javax.swing.text.BoxView.updateChildSizes(BoxView.java:349) at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:331) at javax.swing.text.BoxView.layout(BoxView.java:691) at javax.swing.text.BoxView.setSize(BoxView.java:380) at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:1702) at javax.swing.plaf.basic.BasicTextUI.modelToView(BasicTextUI.java:1034) at javax.swing.text.DefaultCaret.repaintNewCaret(DefaultCaret.java:1291) at javax.swing.text.DefaultCaret$1.run(DefaultCaret.java:1270) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) as the error does not mention any of my classes, how would i go about in finding what is causing this? if i try: public void notifyChatMessage(String message){...} the error goes away. but if i try: public void notifyChatMessage(Object message){...} the error is reported. please advise.

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• Throwing exceptions as well as catching exceptions?

  - by Eric S

  I was wondering how Java takes the following scenario public static void main(String[] args) throws IndexOutOfBoundsException, CoordinateException, MissionException, SQLException, ParserConfigurationException { try { doSomething(); } catch (Exception e) { e.printStackTrace(); } } In the above code, I am declaring the main function to throw many different exceptions, but inside the function, I am catching the generic Exception. I am wondering how java takes this internally? I.e., say doSomething() throws an IndexOutOfBounds exception, will the e.printStackTrace() get called in the last catch (Exception e) {...} block? I know if an exception not declared in the throws area of the function gets thrown, the try/catch will handle it, but what about exceptions mentioned in the declaration?

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• Handling messages for window from other process

  - by MK

  I'm developing a C# WPF application that reparents the main window of another application using a call to Win32 SetParent(). The handle to this out-of-process child window is wrapped by a class named FormHost which is derived from HwndHost. All is working well except for one thing: messages for the reparented window are not delivered to FormHost. MSDN documentation clearly states that the HwndHost window procedure WndProc() cannot be used with out-of-process windows. The alternative, MessageHook doesn't work either. I also tried calling AttachThreadInput() to combine the input processing of the two windows. No luck. Any suggestions?

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• Adding a UITapGestureRecognizer to a view then removing seems to short circuit button events

  - by heymon

  In the code below I am popping up a ImageView as the result of a users touchUpInside on a simple info button. There are other buttons on the view. To dismiss the info I added a UITapGestureRecognizer to my controllers view, and hide the view when the tap is detected. If I don't remove the tapGestureRecognizer, the action is called every time some. Even when I do remove the gesture action, no bottons receive touchUpInside events once this gesture recognizer is added. Why? Code from my MainViewController (void) dismissInfo: (UITapGestureRecognizer *)gesture { [kInfoView setHidden: YES]; [gesture removeTarget: self action: NULL]; } (IBAction) displayInfo { CGRect startFrame = CGRectMake(725, 25, 0, 0), origFrame; CGFloat yCenter = [kInfoView frame].size.height/2 + 200; CGPoint startCenter = CGPointMake(724, 25), displayCenter = CGPointMake(384, yCenter); UITapGestureRecognizer *g = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(dismissInfo:)]; [self.view addGestureRecognizer: g]; origFrame = [kInfoView frame]; [kInfoView setCenter: startCenter]; [kInfoView setHidden: NO]; [kInfoView setFrame: startFrame]; [UIView beginAnimations: @"info" context: nil]; [UIView setAnimationDuration: .5]; [UIView setAnimationDelegate: self]; [kInfoView setFrame: origFrame]; [kInfoView setCenter: displayCenter]; [UIView commitAnimations]; }

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• Properly handling unicode characters in Rails

  - by Gdeglin

  By default Rails allows users of our application to input non-utf8 data, such as: ¶®«¼ However when we attempt to retrieve the data from our database and render it in a template Rails incorrectly assumes that it is in UTF-8 format and throws an error. ArgumentError: invalid byte sequence in UTF-8 What is the best way to handle this? I have seen one fix that suggested sanitizing the data in every place the user can input it. However, that would involve changing a considerable amount of code and it would strip out the characters entirely. Ideally we would want some characters converted to their UTF-8 equivalents. Our environment: Ruby: 1.9.1 Rails 2.3.5 MySql Gem: 2.8.1 This is a serious and urgent problem for us so your answers are very appreciated!

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• C# WCF/WebService: Interoperable exception handling.

  - by michael paul

  I understand that WCF will convert an exception into a fault and send it back as a SOAP message, but I was wondering if this is truly interoperable. I guess I'm having a tough time trying to figure out this possible scenario: Client (Java) calls a WCF Service (LoginService). Server checks for proper authorization, user authorization fails. Server throws an UnauthorizedAccessException. WCF converts this into a Fault somehow. (* - See Below As Well) Client has to be able to know how to read this Fault. I guess I'm just having a tough time understanding how this could still be interoperable because it is expecting Java to know how to translate a SOAP Fault that .NET encodes from an UnauthorizedAccessException. Also, how does .NET actually convert the exception to a fault, what goes in as the fault code, name, etc. Some of the things seem to be "duh"s like perhaps the Fault Name is "UnauthorizedAccessException", but I'd rather know for sure than guess.

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• Hide an access violation on another application

  - by Fernando

  Hi, I have an application that sometimes causes an access violation on exit. This is quite unpredictable and all attempts to locate the bug have been unsuccesful so far. The bug is harmless, as no data is lost, so I was thinking if it might be possible to just hide it. Is it possible to have another app launch the buggy one and catch the Access Violation exception if it occurs? If yes, how? Thanks in advance!

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• Handling Unknown JSON Properties with Jackson

  - by henrik_lundgren

  Hi, For deserializing json with unknown field into an object there's @JsonAnySetter. But what if I read such json into my object, modify some known fields and write it back to json? The unknown properties will be lost. How do I handle such cases? Is it possible to map an object or do I have to read the data into a JsonNode or Map?

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• wxWidgets EVT_KILL_FOCUS

  - by Wallter

  Q1:I am using wxWidgets (C++) and have come accost a problem that i can not locate any help. I have created several wxTextCtrl boxes and would like the program to update the simple calculations in them when the user 'kills the focus.' I could not find any documentation on this subject on the wxWidgets webpage and Googling it only brought up wxPython. The two events i have found are: EVT_COMMAND_KILL_FOCUS - EVT_KILL_FOCUS for neither of which I could find any snippet for. Could anyone give me a short example or lead me to a page that would be helpful? Q2:Would i have to create an event to handle the focus being killed for each of my 8 wxTextCtrl boxes? In the case that i have to create a different event: How would i get each event to differentiate from each other? Will i have to create new wxID's for each of the wxTextCtrl boxes? class BasicPanel : public wxPanel { ... wxTextCtrl* one; wxTextCtrl* two; wxTextCtrl* three; wxTextCtrl* four; ... }

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• AST with fixed nodes instead of error nodes in antlr

  - by ahe

  I have an antlr generated Java parser that uses the C target and it works quite well. The problem is I also want it to parse erroneous code and produce a meaningful AST. If I feed it a minimal Java class with one import after which a semicolon is missing it produces two "Tree Error Node" objects where the "import" token and the tokens for the imported class should be. But since it parses the following code correctly and produces the correct nodes for this code it must recover from the error by adding the semicolon or by resyncing. Is there a way to make antlr reflect this fixed input it produces internally in the AST? Or can I at least get the tokens/text that produced the "Tree Node Errors" somehow? In the C targets antlr3commontreeadaptor.c around line 200 the following fragment indicates that the C target only creates dummy error nodes so far: static pANTLR3_BASE_TREE errorNode (pANTLR3_BASE_TREE_ADAPTOR adaptor, pANTLR3_TOKEN_STREAM ctnstream, pANTLR3_COMMON_TOKEN startToken, pANTLR3_COMMON_TOKEN stopToken, pANTLR3_EXCEPTION e) { // Use the supplied common tree node stream to get another tree from the factory // TODO: Look at creating the erronode as in Java, but this is complicated by the // need to track and free the memory allocated to it, so for now, we just // want something in the tree that isn't a NULL pointer. // return adaptor->createTypeText(adaptor, ANTLR3_TOKEN_INVALID, (pANTLR3_UINT8)"Tree Error Node"); } Am I out of luck here and only the error nodes the Java target produces would allow me to retrieve the text of the erroneous nodes?

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• Handling autopost back in MVC

  - by Shetty

  hi, How do i handle autopoatback in MVC? suppose i have a textbax. I enter a value in it, i need to check if the value exists in some table in the database. So in ASP .net i can set autopostback =true and handle on TextBox_TextChanged event. How do i do it here?? And what are the pros and cons of using asp.NET server control in MVC?

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• Handling form security

  - by Harun Baris Bulut

  So how do you maintain the form security about posting data to different page problem? For instance you have a member and he/she tries to change the personal settings and you redirected member to www.domain.com/member/change/member_id member changed the values and post the data to another page by changing the action with firebug or something else. For instance www.domain.com/member/change/member_id_2 How do you handle this problem without using sessions?

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• Java - AWT / Swing - handling the Event Descriptor Thread

  - by waitinforatrain

  Hi, I have a question about the 'Event Descriptor Thread'. I have a Main class that is also a JFrame. It initialises the rest of the components in the code, some of them do not involve Swing and some of them do. Is it enough to simply initialise the Main class using the EDT like this?... public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { new Main(); } }); } This way everything would run on the Event Dispatcher thread.

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• Why a very good PHP framework - Qcodo (or Qcubed - its branch) - is so unpopular?

  - by Pawel

  I am wondering why this framework (QCodo) is almost forgotten and totally unpopular. I've started using it a few years ago and it is the only thing that keeps me with PHP. Yeah ... its development is stuck (that's why there is now more active branch Qcubed) but it is still very good piece of software. Its main advantages: Event driven (something like asp.net) no spaghetti code Powerful code generation good ORM follows DRY very simple AJAX support is fun to write Since then I wanted to be trendy and checked Django but I cannot write normal request-based web application (it just doesn't feel right). Don't believe? chess.com is written with it and surely there are plenty others. My 2 questions are: Have you heard of it (PHP people)? If you are using it what is your opinion about it (show us examples of your work) Thanks

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• Alternative to jQuery's .toggle() method that supports eventData?

  - by Bungle

  The jQuery documentation for the .toggle() method states: The .toggle() method is provided for convenience. It is relatively straightforward to implement the same behavior by hand, and this can be necessary if the assumptions built into .toggle() prove limiting. The assumptions built into .toggle have proven limiting for my current task, but the documentation doesn't elaborate on how to implement the same behavior. I need to pass eventData to the handler functions provided to toggle(), but it appears that only .bind() will support this, not .toggle(). My first inclination is to use a flag global to a single handler function to store the click state. In other words, rather than: $('a').toggle(function() { alert('odd number of clicks'); }, function() { alert('even number of clicks'); }); do this: var clicks = true; $('a').click(function() { if (clicks) { alert('odd number of clicks'); clicks = false; } else { alert('even number of clicks'); clicks = true; } }); I haven't tested the latter, but I suspect it would work. Is this the best way to do something like this, or is there a better way that I'm missing? Thanks!

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• Handling Solr read and write timeout exception

  - by Azhar

  Hello, I am new to solr. I have developed a an website which uses solr for indexing. I want to handle the timeouts that can occur during solr read and write index.Please guide me on how can i handle these exceptions. I am using solrj as solr client and my website and solr server are running on the tomcat. Thnak you!

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