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  • Compiler warning when passing NSError ** as a method parameter

    - by splicer
    I've been scratching my head about this for the last 4 hours, trying out all kinds of little experiments, but I can't seem to figure out what's going wrong. Could this be a compiler bug? Test.m: - (id)initWithContentsOfURL:(NSURL *)aURL error:(NSError **)error { if (!(self = [super init])) { return nil; } return self; } main.m: NSError *error; Test *t = [[Test alloc] initWithContentsOfURL:[NSURL fileURLWithPath:@"/"] error:&error]; Here's the compiler warning (from main.m): warning: incompatible Objective-C types 'struct NSError **', expected 'struct NSDictionary **' when passing argument 2 of 'initWithContentsOfURL:error:' from distinct Objective-C type I'm using the latest versions of Xcode and Snow Leopard.

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  • C# : Filtering data of data table using select method

    - by Royson
    I have data table containing one column as FilePath. FilePath D:\New folder\link.txt D:\New folder\SharepointMigration(Work Schedule).xls D:\New folder\my2\link.txt D:\New folder\my2\SharepointMigration(Work Schedule).xls D:\New folder\my2\my3\New Text Document.txt D:\New folder\Try.txt I am filtering my data table by DataRow[] dtRow = dataTable_FilesWithMetaData.Select("FilePath Like '" + sourcePath + "%'"); But it gives me all files and subfolder files. But i want only files not subfolders. How to write such type of filter expression..??

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  • jquery load method

    - by cognos79
    I am using mscaptcha image and trying to only reload the captcha image on button click. Seems like the captcha image is being loaded twice sometimes. <script type="text/javascript"> $(document).ready(function() { $('#btnSubmit').click(function() { $('#dvCaptcha').load('default.aspx #dvCaptcha'); }); }); </script> <div id="btnDiv"> <asp:Button ID="btnSubmit" runat="server" Text="Submit" /> </div> <div id="dvCaptcha"> <cc1:CaptchaControl ID="ccJoin" runat="server" CaptchaBackgroundNoise="none" CaptchaLength="5" CaptchaHeight="60" CaptchaWidth="200" CaptchaLineNoise="None" CaptchaMinTimeout="5" CaptchaMaxTimeout="240" /> </div> Any ideas?

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  • Call the cast operator of template base class within the derived class

    - by yoni
    I have a template class, called Cell, here the definition: template <class T> class OneCell { ..... } I have a cast operator from Cell to T, here virtual operator const T() const { ..... } Now i have derived class, called DCell, here template <class T> class DCell : public Cell<T> { ..... } I need to override the Cell's cast operator (insert a little if), but after I need to call the Cell's cast operator. In other methods it's should be something like virtual operator const T() const { if (...) { return Cell<T>::operator const T; } else throw ... } but i got a compiler error error: argument of type 'const int (Cell::)()const' does not match 'const int' What can I do? Thank you, and sorry about my poor English.

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  • Creating a bitmask parameter for a function or method

    - by synic
    I noticed a lot of Android functions have a parameter that you can pass in that's a bitmask, for different options, like on PendingIntent, you can pass in things like you can call getActivity() with PendingIntent.FLAG_CANCEL_CURRENT|PendingIntent.FLAG_NO_CREATE. I'm wondering how I can create a function that has a parameter like this?

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  • strategy for choosing proper object and proper method

    - by zerkms
    in the code below at first if statements block (there will be more than just "worker" condition, joined with else if) i select proper filter_object. After this in the same conditional block i select what filter should be applied by filter object. This code is silly. public class Filter { public static List<data.Issue> fetch(string type, string filter) { Filter_Base filter_object = new Filter_Base(filter); if (type == "worker") { filter_object = new Filter_Worker(filter); } else if (type == "dispatcher") { filter_object = new Filter_Dispatcher(filter); } List<data.Issue> result = new List<data.Issue>(); if (filter == "new") { result = filter_object.new_issues(); } else if (filter == "ended") { result = filter_object.ended_issues(); } return result; } } public class Filter_Base { protected string _filter; public Filter_Base(string filter) { _filter = filter; } public virtual List<data.Issue> new_issues() { return new List<data.Issue>(); } public virtual List<data.Issue> ended_issues() { return new List<data.Issue>(); } } public class Filter_Worker : Filter_Base { public Filter_Worker(string filter) : base(filter) { } public override List<data.Issue> new_issues() { return (from i in data.db.GetInstance().Issues where (new int[] { 4, 5 }).Contains(i.RequestStatusId) select i).Take(10).ToList(); } } public class Filter_Dispatcher : Filter_Base { public Filter_Dispatcher(string filter) : base(filter) { } } it will be used in some kind of: Filter.fetch("worker", "new"); this code means, that for user that belongs to role "worker" only "new" issues will be fetched (this is some kind of small and simple CRM). Or another: Filter.fetch("dispatcher", "ended"); // here we get finished issues for dispatcher role Any proposals on how to improve it?

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  • Presentmodalviewcontroller method problem with retain count

    - by Infinity
    Hello guys! I am trying to present a modal view controller. I have read the documentation, but something is strange. Here's my code: NSLog(@"rc: %d", [modalViewController retainCount]); UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:modalViewController]; [self presentModalViewController:navigationController animated:YES]; [navigationController release]; NSLog(@"rc: %d", [modalViewController retainCount]); And on the console, appears: rc: 2 rc: 24 And I think 24 is very strange... What do you thin? Why is this happening?

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  • PredicateBuilder "And" Method not working

    - by mikemurf22
    I have downloaded the predicate builder and am having a difficult time getting it to work with the entity framework. Here is my code: v_OrderDetail is the entity var context = new OrdersEntities(); Expression<Func<v_OrderDetail,bool>> whereClause = w => true; var predicate = PredicateBuilder.True<v_OrderDetail>(); predicate.And(w => w.Status == "Work"); var results = context.v_OrderDetail.AsExpandable().Where(predicate); When I look at the results I get back every order. The And predicate doesn't seem to take. When I look at the predicate.parameters.count it only shows 1. I'm not sure, but I would expect it to show 2 after I add the second one. Any help is greatly appreciated.

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  • OleDbException in my update method

    - by Hamed Norouzi
    Why do I have this error? The error message is: Syntax error in INSERT INTO statement. I want to add a record to my database, but it isn't working. Where is the problem? The code is: using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbDataAdapter DbDataAdabter = new OleDbDataAdapter(); DbDataAdabter.SelectCommand = new OleDbCommand("SELECT * FROM [Phone-Book]", connection); OleDbCommandBuilder cb = new OleDbCommandBuilder(DbDataAdabter); connection.Open(); DataRow dataRow = myDataset.Tables["salam"].NewRow(); dataRow[1] = textBox2.Text; dataRow[2] = textBox3.Text; dataRow[3] = textBox4.Text; dataRow[4] = textBox5.Text; dataRow.EndEdit(); myDataset.Tables["salam"].Rows.Add(dataRow); DbDataAdabter.Update(myDataset , "salam"); connection.Close(); connection.Dispose(); } }

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  • call method in a subclass of UIView

    - by rdesign
    Hey, I've got a UIViewController and an own class, a subclass of UIView. In my ViewController I make a instance of the uiview. If I tap the uiview a function gets called within it and an overlay appears. TO get rid of that overlay later the user has to tap somewhere on the screen(besides the instance of my class) How do I tell my class to dismiss the overlay? I already thought of delegate. So my thoughts were to make a MyUIViewControllerdelegate. If my viewcontroller receives a tap the delegate should be called. THe only problem is how do I tell my subclass that it should receive that delegate? I Have no instance of my viewcontroller in my subclass so I can not set the delegate. Any Ideas? Hope my problem is clear :) Thanks a lot

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  • Method synonyms in Ruby

    - by Max
    I'm familiarizing myself with Ruby and it's the first time I see synonyms for methods in the standard library. For now I've found the ones in the Enumerable module: collect <- map detect <- find include <- member etc. Probably other modules contains synonymic methods too. Why are they there? Is it some kind of backward compatibility? Or is it a feature of the language, so the programmer can choose between different options depending on the context to make the program look like plain English?

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  • Better way to call superclass method in ExtJS

    - by Rene Saarsoo
    All the ExtJS documentation and examples I have read suggest calling superclass methods like this: MyApp.MyPanel = Ext.extend(Ext.Panel, { initComponent: function() { // do something MyPanel specific here... MyApp.MyPanel.superclass.initComponent.call(this); } }); I have been using this pattern for quite some time and the main problem is, that when you rename your class then you also have to change all the calls to superclass methods. That's quite inconvenient, often I will forget and then I have to track down strange errors. But reading the source of Ext.extend() I discovered, that instead I could use the superclass() or super() methods that Ext.extend() adds to the prototype: MyApp.MyPanel = Ext.extend(Ext.Panel, { initComponent: function() { // do something MyPanel specific here... this.superclass().initComponent.call(this); } }); In this code renaming MyPanel to something else is simple - I just have to change the one line. But I have doubts... I haven't seen this documented anywhere and the old wisdom says, I shouldn't rely on undocumented behaviour. I didn't found a single use of these superclass() and supr() methods in ExtJS source code. Why create them when you aren't going to use them? Maybe these methods were used in some older version of ExtJS but are deprecated now? But it seems such a useful feature, why would you deprecate it? So, should I use these methods or not?

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  • General method for making sub arrays around a particular element

    - by JJ
    What is a quick, elegant way of using MatLab to form a subarray around a particular element? Element are selected randomly from the data, so you can't take a subarray in the normal way (it has to be generalized for the elements that are selected). What I mean is, forming an array for example 5x5 or 7x7 or something, where the middle element is the one you want.

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  • adding a js method

    - by Sorin Buturugeanu
    Hi! I have a js function that is named getID which is basically return document.getElementById(id) I want to make another function, getTag that would return getElementsByTagName. The part that I can't seem to manage is that I want to be able to call them like this: getID('myid').getTag('input') = so this would return all the input elements inside the element with the id myid Thanks! ps: getTag would also have to work if it's called by it's own, but then it would just return document.getElementsByTagName

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  • Trying to get a json result back from method in another namespace, having issues

    - by Blankman
    I have a seperate .js file and namespace for json requests. I have another .js file and namespace for the actual logic. I can't seem to get the result back in my logic layer. var jsonResult = Blah.Data.LoadAggregates(); alert(jsonResult); alert(jsonResult.d.length); alert(jsonResult.length); all of the above calls are returning undefined. Blah.RegisterNamespace("Blah.Data"); (function(Data) { Data.LoadAggregates = function() { $.ajax({ type: "POST", url: "asdf.asmx/GetAggregates", data: "{}", contentType: "application/json; charset=utf-8", dataType: "json", success: function(data) { ??????? }, error: function(msg) { alert("error" + msg); } }); }; })(Blah.Data);

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  • When using the getInstance() method of the abstract java.text.NumberFormat class, what is the actual

    - by iamchuckb
    This question expands upon the one at abstract-class-numberformat-very-confused-about-getinstance. I feel that this question is different enough to merit being asked on its own. In the answers to that question, it was stated that a code statement such as NumberFormat en = NumberFormat.getInstance(Locale.US); returns an object that is a subclass of the java.text.NumberFormat class. It makes sense to me why the return type can't be just an instance of NumberFormat since that is an abstract class. Rather, it was stated that the returned object is at least an instance of NumberFormat, but actually something else. My question is this: what specifically is the class of the object that is returned? In the Sun documentation the only subclasses I see are ChoicesFormat and DecimalFormat. Is there some sort of behind the scenes compiler voodoo going on here? Thanks in advance!

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  • Stop method not working

    - by avoq
    Hi everyone , can anybody tell me why the following code doesn't work properly? I want to play and stop an audio file. I can do the playback but whenever I click the stop button nothing happens. Here's the code : Thank you. .................. import java.io.*; import javax.sound.sampled.*; import javax.swing.*; import java.awt.event.*; public class SoundClipTest extends JFrame { final JButton button1 = new JButton("Play"); final JButton button2 = new JButton("Stop"); int stopPlayback = 0; // Constructor public SoundClipTest() { button1.setEnabled(true); button2.setEnabled(false); // button play button1.addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e){ button1.setEnabled(false); button2.setEnabled(true); play(); }// end actionPerformed }// end ActionListener );// end addActionListener() // button stop button2.addActionListener( new ActionListener(){ public void actionPerformed( ActionEvent e){ //Terminate playback before EOF stopPlayback = 1; }//end actionPerformed }//end ActionListener );//end addActionListener() this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setTitle("Test Sound Clip"); this.setSize(300, 200); JToolBar bar = new JToolBar(); bar.add(button1); bar.add(button2); bar.setOrientation(JToolBar.VERTICAL); add("North", bar); add("West", bar); setVisible(true); } void play() { try { final File inputAudio = new File("first.wav"); // 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. final Clip 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(); c.start(); if (stopPlayback == 1 ) {c.stop();} } catch (UnsupportedAudioFileException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (LineUnavailableException e) { e.printStackTrace(); } }// end play public static void main(String[] args) { //new SoundClipTest().play(); new SoundClipTest(); } }

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  • SQLiteDataAdapter Update method returning 0

    - by Lirik
    I loaded 83 rows from my CSV file, but when I try to update the SQLite database I get 0 rows... I can't figure out what I'm doing wrong. The program outputs: Num rows loaded is 83 Num rows updated is 0 The source code is: public void InsertData(String csvFileName, String tableName) { String dir = Path.GetDirectoryName(csvFileName); String name = Path.GetFileName(csvFileName); using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + dir + @";Extended Properties=""Text;HDR=Yes;FMT=Delimited""")) { conn.Open(); using (OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM " + name, conn)) { QuoteDataSet ds = new QuoteDataSet(); adapter.Fill(ds, tableName); Console.WriteLine("Num rows loaded is " + ds.Tags.Rows.Count); InsertData(ds, tableName); } } } public void InsertData(QuoteDataSet data, String tableName) { using (SQLiteConnection conn = new SQLiteConnection(_connectionString)) { using (SQLiteDataAdapter sqliteAdapter = new SQLiteDataAdapter("SELECT * FROM " + tableName, conn)) { using (new SQLiteCommandBuilder(sqliteAdapter)) { conn.Open(); Console.WriteLine("Num rows updated is " + sqliteAdapter.Update(data, tableName)); } } } } Any hints on why it's not updating the correct number of rows?

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  • Why does virtual assignment behave differently than other virtual functions of the same signature?

    - by David Rodríguez - dribeas
    While playing with implementing a virtual assignment operator I have ended with a funny behavior. It is not a compiler glitch, since g++ 4.1, 4.3 and VS 2005 share the same behavior. Basically, the virtual operator= behaves differently than any other virtual function with respect to the code that is actually being executed. struct Base { virtual Base& f( Base const & ) { std::cout << "Base::f(Base const &)" << std::endl; return *this; } virtual Base& operator=( Base const & ) { std::cout << "Base::operator=(Base const &)" << std::endl; return *this; } }; struct Derived : public Base { virtual Base& f( Base const & ) { std::cout << "Derived::f(Base const &)" << std::endl; return *this; } virtual Base& operator=( Base const & ) { std::cout << "Derived::operator=( Base const & )" << std::endl; return *this; } }; int main() { Derived a, b; a.f( b ); // [0] outputs: Derived::f(Base const &) (expected result) a = b; // [1] outputs: Base::operator=(Base const &) Base & ba = a; Base & bb = b; ba = bb; // [2] outputs: Derived::operator=(Base const &) Derived & da = a; Derived & db = b; da = db; // [3] outputs: Base::operator=(Base const &) ba = da; // [4] outputs: Derived::operator=(Base const &) da = ba; // [5] outputs: Derived::operator=(Base const &) } The effect is that the virtual operator= has a different behavior than any other virtual function with the same signature ([0] compared to [1]), by calling the Base version of the operator when called through real Derived objects ([1]) or Derived references ([3]) while it does perform as a regular virtual function when called through Base references ([2]), or when either the lvalue or rvalue are Base references and the other a Derived reference ([4],[5]). Is there any sensible explanation to this odd behavior?

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  • CSS - Which method is better?

    - by Joe
    Which is better in regards to processing time but also taking into account ease of use for a developer? .font_small{ font-size:10px; } .font_blue{ color:blue; } .font_red{ color:red; } <span class="font_small font_blue">Hello World!</span><br /> <span class="font_small font_red">Today's the day!</span> OR .font_blue_small{ color:blue; } .font_red_small{ color:red; } .font_blue_small .font_red_small { font-size:10px; } <span class="font_blue_small">Hello World!</span><br /> <span class="font_red_small">Today's the day!</span> OR .font_blue_small{ color:blue; font-size:10px; } .font_red_small{ color:red; font-size:10px; } <span class="font_blue_small">Hello World!</span><br /> <span class="font_red_small">Today's the day!</span> OR Another option I haven't though of yet...?

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  • Compilers behave differently with a null parameter of a generic method

    - by Eyal Schneider
    The following code compiles perfectly with Eclipse, but fails to compile with javac: public class HowBizarre { public static <P extends Number, T extends P> void doIt(P value) { } public static void main(String[] args) { doIt(null); } } I simplified the code, so T is not used at all now. Still, I don't see a reason for the error. For some reason javac decides that T stands for Object, and then complains that Object does not conform to the bounds of T (which is true): HowBizarre.java:6: incompatible types; inferred type argument(s) java.lang.Number,java.lang.Object do not conform to bounds of type variable (s) P,T found : <P,T>void required: void doIt(null); ^ Note that if I replace the null parameter with a non-null value, it compiles fine. Which of the compilers behaves correctly and why? Is this a bug of one of them?

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