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  • AsyncTask Threading Rule - Can it really only be used once?

    - by stormin986
    In the documentation on AsyncTask it gives the following as a rule related to threading: The task can be executed only once (an exception will be thrown if a second execution is attempted.) All this means is that you have to create a new instance of the class every time you want to use it, right? In other words, it must be done like this: new DownloadFilesTask().execute(url1, url2, url3); new DownloadFilesTask().execute(url4, url5, url6); Or conversely, you can NOT do the following: DownloadFilesTask dfTask = new DownloadFilesTask(); dfTask().execute(url1, url2, url3); dfTask().execute(url4, url5, url6); Can someone verify this is an accurate interpretation? I realize I pretty much just answered this for myself as I was typing this out... But it wasn't immediately obvious to me so I think this would be useful to have posted nonetheless.

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  • How do I programmatically nullify a File Attachment in InfoPath Forms

    - by Doctor Zinda
    Howdy all, I'm running into a problem with some InfoPath C# code while trying to remove an attachment from a form. Basically the process is: User opens form User clicks button File attachment is cleared I've tried adding a blank attachment to my schema that never becomes populated, then setting the original field's value equal to that value by the method below. When debugging the form I catch an error: Schema validation found non-data type errors. Any tips here would be appreciated. public void BTN_ClearAttachment_Clicked(object sender, ClickedEventArgs e) { try { _OriginalAttachment.SetValue(_BLANK_ATTACHMENT.Value); } catch (Exception ex) { _ErrorField.SetValue(ex.Message + " : " + ex.StackTrace); } } Thanks, Dr Z Edit - P.S. I should clear up that both _OriginalAttachment & _ErrorField are both XPathNavigators, pointing at different schema elements. I've verified that these XPathNavigators are both pointing at valid schema elements.

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  • can't explain NullPointerException

    - by John Pope
    In the following code, i have a method to get a Vector of persons with the same zodiac sign. persoane is a Vector. I keep getting a NullPointerException at the if condition (persoane is definetly not null). I am unable to see why. Any help would be greatly appreciated public Vector<Persoana> cautaDupaZodie(String zodie) { Vector<Persoana> rezultat= new Vector<Persoana>(); for(int i=0; i<persoane.size(); i++) { if(persoane.get(i).getData().getZodie().equals(zodie)) //the exception occurs here { rezultat.add(persoane.get(i)); } } return rezultat; }

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  • Custom ArrayList serialization

    - by rayman
    Hi, i was trying to serialize an ArrayList which contacins custom objects. I`am serializing it in a servlet(server side), and deserialize at the client side. (using ObjectOutputStream,ObjectInputStream) it worked fine, when I work with ArrayList< String but when i tried it with ArrayList< MyObject i couldnt get any results in the client side, this is the exception: java.lang.ClassNotFoundException: web.MyObject *ofcourse that i have done this: MyObject implements Serializable ... MyObject contains only String fields in it. what have I done worng? Thanks, ray.

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  • Update through Linq-to-SQL DataContext not working.

    - by Puneet Dudeja
    I have created a small test for updating table using Linq-to-SQL DataContext as follows: using (pessimistic_exampleDataContext db = new pessimistic_exampleDataContext()) { var query = db.test1s.First(t => t.a == 3); if (query.b == "a") query.b = "b"; else query.b = "a"; db.SubmitChanges(); } But after executing this code in a console application in Main method, when I select records from the table, the record is not updated. I have debugged through the code, and it is not even throwing any exception. What can be the problem ?

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  • unrecognized selector sent to instance

    - by iamsmug
    My app works fine in the simulator but when I run it on my phone I get this error: 2010-04-05 21:32:45.119 Top Banana[119:207] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[MethodViewController setReferringObject:]: unrecognized selector sent to instance 0x16e930' It happens here: -(void)method { [UIView beginAnimations:@"View Flip" context:nil]; [UIView setAnimationDuration:0.50]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; [UIView setAnimationTransition: UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache:NO]; MethodViewController *methodViewController = [[MethodViewController alloc] initWithNibName:@"MethodViewController" bundle:0]; NSManagedObject *selectedObject = self.referringObject; methodViewController.referringObject = selectedObject; [self.navigationController pushViewController:methodViewController animated:NO]; methodViewController.title = @"Method"; [UIView commitAnimations]; [MethodViewController release]; } It crashes on this line: methodViewController.referringObject = selectedObject; Not sure how to resolve this as it works in the simulator, I'm sure it is fairly basic to fix, any help will be appreciated.

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  • Using a backwards relation (i.e FOO_set) for ModelChoiceField in Django

    - by Bwmat
    I have a model called Movie, which has a ManyToManyField called director to a model called Person, and I'm trying to create a form with ModelChoiceField like so: class MovieSearchForm(forms.Form): producer = forms.ModelChoiceField(label='Produced by', queryset=movies.models.Person.producer_set, required=False) but this seems to be failing to compile (I'm getting a ViewDoesNotExist exception for the view that uses the form, but it goes away if I just replace the queryset with all the person objects), I'm guessing because '.producer_set' is being evaluated too 'early'. How can I get this work? here are the relevant parts of the movie/person classes: class Person(models.Model): name = models.CharField(max_length=100) class Movie(models.Model): ... producer = models.ForeignKey(Person, related_name="producers") director = models.ForeignKey(Person, related_name="directors") What I'm trying to do is get ever Person who is used in the producer field of some Movie.

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  • Statement.RETURN_GENERATED_KEYS concept

    - by rits
    import java.sql.* ; import java.util.* ; import java.io.* ; class DataBaseFactory{ public static Connection getConnection(){ ... ... ... ... } } class Demo{ public static void main(String []args) throws SQLException{ Connection con = DataBaseFactory.getConnection() ; //This is throwing exception //PreparedStatement ps = con.prepareStatement("insert into user values(?,?)", Statement.RETURN_GENERATED_KEYS) ; //But this is working fine PreparedStatement ps = con.prepareStatement("insert into user values(?,?)") ; } } thnx in advance to all the java people here....

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  • How can I add Copperplate Gothic Bold font in my iPhone program ?

    - by srikanth rongali
    Hi, I need to display some text in cocos2d layer. I added UITextView to it. I added the text in the text View. But, for setting the font by ( UIFont class), I could not do it. I saw the list of supported fonts for iPhone, In that list Copperplate Gothic Bold is not there. I downloaded it from net. It is working good for CCLabel and CCFontMenuItem. How can I make it work for UILabel ? * Assertion failure in -[UILabel setFont:], /SourceCache/UIKit/UIKit-963.10/UILabel.m:445 2010-05-19 16:07:43.282 testOfGameScreen[1155:207] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: font != nil' 2010-05-19 16:07:43.285 testOfGameScreen[1155:207] Stack: ( I am getting the above error when using UIFont with Copperplate Gothic Bold Thank you.

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  • Is it possible to cast the Elapsed Time function to Integer?

    - by nuvio
    I have the following function: (def elapsedtime (with-out-str (time (run-my-function)))) and I was wondering if is possible to store only the integer value of the time, as I can only store a String at the moment.... Any suggestion? Thanks a lot UPDATE So I did use this: (defmacro nsecs [expr] `(let [start# (. System (nanoTime))] ~expr (- (. System (nanoTime)) start#))) And then modified this: (def elapsedtime (nsecs (run-my-function argument1 argument2))) but doesn't work, what am I doing wrong? "Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Wrong number of args (1) passed to: main$fn--105$nsecs"

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  • dozer custom convertors for primitive types

    - by koti
    the below url has an example on dozer custom convertors.. http://stackoverflow.com/questions/1931212/map-collection-size-in-dozer but when i tried that example its giving the exception like this.. Type: null Source parent class: dozerPackage.Source Source field name: images Source field type: class java.util.ArrayList Source field value: [www, eee] Dest parent class: dozerPackage.Destination Dest field name: numOfImages Dest field type: int org.dozer.MappingException: Destination Type (int) is not accepted by this Custom Converter (dozerPackage.TestCustomFieldConverter)! is there any way that i can return the primitive types from dozer custom convertors..

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  • How do I correctly use generics?

    - by ninjasense
    I basically am making webrequests and recieving a JSON response. Depending on the request, I am parsing JSON request into objects I have created. The parsing is pretty much the same no matter what the object Im parsing into looks like. So I have a bunch of methods doing the same work only with different objects, I was wondering how I could accomplish this with generics? Here is an example public static ArrayList<Contact> parseContacts(String responseData) { ArrayList<Contact> Contacts = new ArrayList<Contact>(); try { JSONArray jsonContacts = new JSONArray(responseData); if (!jsonContacts.isNull(0)) { for (int i = 0; i < jsonContacts.length(); i++) { Contacts.add(new Contact(jsonContacts.getJSONObject(i))); } } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { } return Contacts; }

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  • how to use Thread in java ?

    - by tiendv
    Hi all i have code use googleseach API I want to use Thread to improve speed of my program. But i have a problem here is code import java.io.BufferedReader; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; import java.net.URLEncoder; import java.util.ArrayList; import java.util.Enumeration; import java.util.Hashtable; import java.util.List; import org.json.JSONArray; import org.json.JSONObject; import com.yahoo.search.WebSearchResult; /** * Simple Search using Google ajax Web Services * * @author Daniel Jones Copyright 2006 Daniel Jones Licensed under BSD open * source license http://www.opensource.org/licenses/bsd-license.php */ public class GoogleSearchEngine extends Thread { private String queryString; private int maxResult; private ArrayList<String> resultGoogleArrayList = null; public ArrayList<String> getResultGoogleArrayList() { return resultGoogleArrayList; } public void setResultGoogleArrayList(ArrayList<String> resultGoogleArrayList) { this.resultGoogleArrayList = resultGoogleArrayList; } public String getQueryString() { return queryString; } public void setQueryString(String queryString) { this.queryString = queryString; } public int getMaxResult() { return maxResult; } public void setMaxResult(int maxResult) { this.maxResult = maxResult; } // Put your website here public final static String HTTP_REFERER = "http://www.example.com/"; public static ArrayList<String> makeQuery(String query, int maxResult) { ArrayList<String> finalArray = new ArrayList<String>(); ArrayList<String> returnArray = new ArrayList<String>(); try { query = URLEncoder.encode(query, "UTF-8"); int i = 0; String line = ""; StringBuilder builder = new StringBuilder(); while (true) { // Call GoogleAjaxAPI to submit the query URL url = new URL("http://ajax.googleapis.com/ajax/services/search/web?start=" + i + "&rsz=large&v=1.0&q=" + query); URLConnection connection = url.openConnection(); if (connection == null) { break; } // Value i to stop while or Max result if (i >= maxResult) { break; } connection.addRequestProperty("Referer", HTTP_REFERER); BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8")); while ((line = reader.readLine()) != null) { builder.append(line); } String response = builder.toString(); JSONObject json = new JSONObject(response); JSONArray ja = json.getJSONObject("responseData").getJSONArray("results"); for (int j = 0; j < ja.length(); j++) { try { JSONObject k = ja.getJSONObject(j); // Break string into 2 parts: URL and Title by <br> returnArray.add(k.getString("url") + "<br>" + k.getString("titleNoFormatting")); } catch (Exception e) { e.printStackTrace(); } } i += 8; } // Remove objects that is over the max number result required if (returnArray.size() > maxResult) { for (int k=0; k<maxResult; k++){ finalArray.add(returnArray.get(k)); } } else return returnArray; return finalArray; } catch (Exception e) { e.printStackTrace(); } return null; } @Override public void run() { // TODO Auto-generated method stub //super.run(); this.resultGoogleArrayList = GoogleSearchEngine.makeQuery(queryString, maxResult); System.out.println("Code run here "); } public static void main(String[] args) { Thread test = new GoogleSearchEngine(); ((GoogleSearchEngine) test).setQueryString("data "); ((GoogleSearchEngine) test).setMaxResult(10); test.start(); ArrayList<String> returnGoogleArrayList = null; returnGoogleArrayList = ((GoogleSearchEngine) test).getResultGoogleArrayList(); System.out.print("contents of al:" + returnGoogleArrayList); } } when i run it, it can run into run method but it don't excute make query methor and return null array. when i do't use Thread it can nomal . Can you give me the reason why ? or give a sulution Thanks

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  • Array index is not accessable because it is Friend

    - by user3738194
    I am getting and error when I bring my code into another project. In a blank project it works fine, I really have no idea how to get around it, here is the error Error 1 'System.Data.Index' is not accessible in this context because it is 'Friend'. Dim DataString As String = txtAdvancedCommand.Text ' Create an array containing from each letter in Textbox Dim charArray() As Char = DataString.ToCharArray For index = 0 To charArray.GetUpperBound(0) <-----ERROR on word index Try 'Now lets send the data If SerialPort.IsOpen Then SerialPort.Write(charArray(index) & vbCrLf) <-----ERROR on word index Else ConnectSerial() SerialPort.Write(charArray(index) & vbCrLf) <-----ERROR on word index End If Catch e As Exception txtLog.AppendText(e.Message & vbCrLf) End Try Next now the project I am bringing into has a DLL and I suspect it has something to do with it, I cannot get the source code to the DLL so is there another way around this?

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  • cannot convert to object

    - by Dazz
    if i execute the following code i get a cannot convert to object error; Uncaught exception: TypeError: Cannot convert 'validation.messages.field' to object $.fn.validate = function(validation) { $.each(validation.rules, function(field, fieldRules){ $.each(fieldRules, function(rule, ruleValue){ var fieldValue = $('[name=' + field + ']').val(); if (eval(rule + '(fieldValue, ruleValue)') == false){ alert(validation.rules.field.rule); return false; }else{ return true; }; }); }); } the problem is the alert(validation.messages.field.rule); 'field' = 'persoon_voornaam' and 'rule' = 'required' and validation.messages.persoon_voornaam.required works just fine. What am i doing wrong? validation is a JSON that look like this: { rules: { persoon_voornaam: { required: true, minlength: 5, }, postcode_bestemming: { required: true, minlength: 7, }, }, messages: { persoon_voornaam: { required: 'Dit veld is verplicht', minlengt: 'Dit veld moet minstens 5 lang zijn', }, } }

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  • How to display conformation text using jquery

    - by kumar
    I have showresponse funtion somehting like this.. function showResponse(responseText, statusText, xhr, $form) { if (responseText[0].substring(0, 16) != "System.Exception") { $('#error-msg-ID').html('<strong>Update successful.</strong>'); } else { $('#error-msg-ID').html('<strong>Update failed.</strong> ' + responseText[0].substring(0, 48)); } $('#error-msg-ID').removeClass('hide'); $('#gui-stat-').html(responseText[1]); } $('#exc-').ajaxForm({ target: '#error-msg-ID', beforeSubmit: validate_excpt, success: showResponse, dataType: 'json' }); Div tag is.. <div id="#error-msg-ID"> </div> After update successfull I am not able to show Updatesuccessful mesage on divtag? do i am missing something?

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  • How to run an exe which is added in the project

    - by Manish
    First of all I did gave a look at this one. But I didn't got the solution. The accepted anser says to use it like this: Process p = new Process(); p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.FileName = "myExec.exe"; p.Start(); But this is not working for me. THe exception's message says "The system cannot find the specified file". Am I missing something? I added the exe directly to the project itself.

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  • android steganography

    - by poo123
    Im doing steganography on android...my code is as below.. public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.src); picw = mBitmap.getWidth(); pich = mBitmap.getHeight(); pix= new int[picw * pich]; mBitmap.getPixels(pix, 0, picw, 0, 0, picw, pich); try { FileOutputStream fos = super.openFileOutput("dest.png", MODE_WORLD_READABLE); mBitmap.compress(CompressFormat.PNG, 100, fos); fos.flush(); fos.close(); }catch (Exception e) { tv.setText(e.getMessage()); } but whenever i save source image with Bitmap.compress() method pix[0] value before and after compression changed..so i'm unable to extract original data...please help me

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  • Error handling and polymorphism

    - by Neeraj
    I have an application with some bunch of code like this: errCode = callMainSystem(); switch (errCode){ case FailErr: error("Err corresponding to val1\n"); case IgnoreErr: error("Err corresponding to val2\n"); ... ... default: error("Unknown error\n"); } The values are enum constants. Will it make some sense to have something like: // Error* callMainSystem() ... Some code return FaileErr(); // or some other error // handling code Error* err = callMainSystem(); err->toString(); The Error class may be made singleton as it only has to print error messages. What are the pros and cons of above methods,size is an important criteria as the application needs to be supported on embedded devices as well. P.S: I don't want to use exception handling because of portability issues and associated overheads.

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  • how to handle exceptions/errors in php?

    - by fayer
    when using 3rd part libraries they tend to throw exceptions to the browser and hence kill the script. eg. if im using doctrine and insert a duplicate record to the database it will throw an exception. i wonder, what is best practice for handling these exceptions. should i always do a try...catch? but doesn't that mean that i will have try...catch all over the script and for every single function/class i use? Or is it just for debugging? i don't quite get the picture. Cause if a record already exists in a database, i want to tell the user "Record already exists". And if i code a library or a function, should i always use "throw new Expcetion($message, $code)" when i want to create an error? Please shed a light on how one should create/handle exceptions/errors. Thanks

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  • Is it "legal" for C++ runtime to call terminate() when the C++ code is used inside some non-C++ prog

    - by sharptooth
    In certain cases - especially when an exception escapes a destructor during stack unwinding - C++ runtime calls terminate() which must do something reasonable post-mortem and then exit the program. When a question "why so harsh" arises the answer is usually "there's nothing more reasonable to do in such error situations". That sounds reasonable if the whole program is in C++. Now what if the C++ code is in a library and the program that uses the library is not in C++? This happens quite often - for example I might have a native C++ COM component consumed by a .NET program. Once terminate() is called inside the component code the .NET program suddenly ends abnormally. The program author will first of all think "I don't care of C++, why the hell is this library make my program exit?" How do I handle the latter scenario when developing libraries in C++? Is it reasonable that terminate() unexpectedly ends the program? Is there a better way to handle such situations?

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  • How to customise the TextView inside a Spinner?

    - by Janusz
    I have a Spinner with an ArrayAdapter that feeds Values into it. The Problem is that the text is to long for the view and the result is a very very ugly spinner. As can be seen in the screenshot: I tried to pass the Id of my own TextView into the Adapter but everytime the spinner should be shown I get an Exception that the Id I supplied is not valid: 04-26 17:38:39.695: ERROR/AndroidRuntime(4276): android.content.res.Resources$NotFoundException: Resource ID #0x7f09003a type #0x12 is not valid Where do I have to define the TextView? In a separate xml file? With a surrounding viewgroup? It would help me a lot if I could see an example of the adapter initialization and the textview definition?

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  • Can FLV AAC stream be played in Android

    - by HariKJ
    Hi, I'm trying to build a radio player and the client is providing a stream which is a FLV container with the audio being AAC When I read the headers it shows up as audio/aacp. I have tried all possible ways such as using the 1) Streaming through mediaplayer (Does not work) 2) Use the NPR mode of using a proxy stream (I get a broken pipe exception) 3) Play it in chunks ( Plays but I need the SDCard and the playback is not very great) 4) Use the GPL'd FAAD2 Library but I would have to pay the royalty fee Can some one help me out on figuring this issue out. The last option that I have is to have my client change the stream to mp3 container (which I know that it works) Regards, Hari

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  • Error(2,7): PLS-00428: an INTO clause is expected in this SELECT statement

    - by omgzor
    I'm trying to create this trigger and getting the following compiler errors: create or replace TRIGGER RESTAR_PLAZAS AFTER INSERT ON PLAN_VUELO BEGIN SELECT F.NRO_VUELO, M.CAPACIDAD, M.CAPACIDAD - COALESCE(( SELECT count(*) FROM PLAN_VUELO P WHERE P.NRO_VUELO = F.NRO_VUELO ), 0) as PLAZAS_DISPONIBLES FROM VUELO F INNER JOIN MODELO M ON M.ID = F.CODIGO_AVION; END RESTAR_PLAZAS; Error(2,7): PL/SQL: SQL Statement ignored Error(8,5): PL/SQL: ORA-00933: SQL command not properly ended Error(8,27): PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following: begin case declare end exception exit for goto if loop mod null pragma raise return select update while with <an identifier> <a double-quoted delimited-identifier> <a bind variable> << close current delete fetch lock insert open rollback savepoint set sql execute commit forall merge pipe Error(2,1): PLS-00428: an INTO clause is expected in this SELECT statement What's wrong with this trigger?

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  • How can I copy an XmlNode from one XmlDocument to another?

    - by Chris Wenham
    I'm building a tool that authors/edits XML files, and I want to be able to populate it with template fragments defined in another XML file. For example, the tool has an "Add FooBarBaz Element" button that adds a element to the new document being created, and I want to add FooBarBaz by copying it from a template. Or let's say this is my template file: <Templates> <FooBarBaz Attribute="Value"> <ChildElement/> </FooBarBaz> </Templates> I can then grab a template fragment with .GetElementsByTagName("FooBarBaz"), and I'd like to be able to inject it into the new document with something like .AppendChild(templateNode). But the problem is that an XmlNode cannot be copied from one XmlDocument to another, even if you use .Clone() or .CloneNode(), because AppendChild() throws an exception saying that the template element belongs to another context. Is there an easy way to copy a System.Xml.XmlNode between System.Xml.XmlDocuments?

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