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• Multiplying complex with constant in C++

  - by Atilla Filiz

  The following code fails to compile #include <iostream> #include <cmath> #include <complex> using namespace std; int main(void) { const double b=3; complex <double> i(0, 1), comp; comp = b*i; comp=3*i; return 0; } with error: no match for ‘operator*’ in ‘3 * i’ What is wrong here, why cannot I multiply with immediate constants?

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• save and play recorded sound

  - by blacksheep

  i'd like to save and play again this recorded sounds: @interface Recorder : NSObject { NSMutableArray *times; NSMutableArray *samples; } @end @implementation Recorder – (id) init { [super init]; times = [[NSMutableArray alloc] init]; samples = [[NSMutableArray alloc] init]; return self; } – (void) recordSound: (id) someSound { CFAbsoluteTime now = CFAbsoluteTimeGetCurrent(); NSNumber *wrappedTime = [NSNumber numberWithDouble:now]; [times addObject:wrappedTime]; [samples addObject:someSound]; } @end thanx blacksheep

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• Blackberry RichTextField preferred height during layout

  - by James Veenstra

  This is using the Backberry JDK (5.0 if needed). I have a custom Manager that contains a RichTextField. I want the height of the field to vary by the amount of text in the RichTextField. The sublayout code looks like this (rtf is a RichTextField object): protected void sublayout(int width, int height) { int h = rtf.getPreferredHeight(); setExtent(Display.getWidth(), h); layoutChild(rtf, Display.getWidth(), h); setPositionChild(rtf, 0, 0); setExtent(Display.getWidth(), h); } The call to rtf.getPreferredHeight always returns the same value, no matter how much text (and therefore how many lines on the screen). Any clues on how to get the height of a RichTextField when the content and width are known?

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• .NET TreeView causes application to crash when trying to check Parent node

  - by alexD

  I have a TreeView with check boxes, and when a user checks a child node, I want to go up the tree and check each parent. However, for some reason my application blows up whenever I touch the parent node. For the nodes in my tree, I've extended TreeNode to create my own objects with some data that I need to store in them, but I still reference them as TreeNodes when checking/unchecking. My code looks like this: //checkBox checked event handler if (node.Parent != null) { checkAllParents(node.Parent); } // private void checkAllParents(TreeNode node) { node.Checked = true; if (node.Parent != null) { checkAllParents(node.Parent); } }

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• Qt toggle always on top for a QMainWindow

  - by Jake Petroules

  void MainWindow::on_actionAlways_on_Top_triggered(bool checked) { Qt::WindowFlags flags = this->windowFlags(); if (checked) { this->setWindowFlags(flags | Qt::CustomizeWindowHint | Qt::WindowStaysOnTopHint); this->show(); } else { this->setWindowFlags(flags ^ (Qt::CustomizeWindowHint | Qt::WindowStaysOnTopHint)); this->show(); } } The above solution works but because setWindowFlags hides the window, it needs to be reshown and of course that doesn't look very elegant. So how do I toggle "always on top" for a QMainWindow without that "flashing" side effect?

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• How to access the backing field of an inherited class using fluent nhibernate

  - by Akk

  How do i set the Access Strategy in the mapping class to point to the inherited _photos field? public class Content { private IList<Photo> _photos; public Content() { _photos = new List<Photo>(); } public virtual IEnumerable<Photo> Photos { get { return _photos; } } public virtual void AddPhoto() {...} } public class Article : Content { public string Body {get; set;} } I am currently using thw following to try and locate the backing field but an exception is thrown as it cannot be found. public class ArticleMap : ClassMap<Article> { HasManyToMany(x => x.Photos) .Access.CamelCaseField(Prefix.Underscore) //_photos //... } i tried moving the backing field _photos directly into the class and the access works. So how can i access the backing field of an inherited class?

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• Modal View Does Not Appear in Center in Horizontal Orientation

  - by Sheehan Alam

  I have a UIPresentationFormSheet (contains a textview) that appears in the center of the screen when I am in vertical orientation. When I dismiss the modal view, it disappears fine. When I am in horizontal orientation my modal view does not appear in the center of the screen. I have to dismiss my keyboard for the modal view to appear in the center. [self presentModalViewController:composeTweetController animated:TRUE]; When I dismiss the modal view in horizontal orientation the app automatically switches to vertical orientation. -(void)dismissComposeTweetView{ [self dismissModalViewControllerAnimated:TRUE]; } I want the following to happen: Modal view should appear in the center in horizontal orientation Modal view should disappear without switching to vertical orientation

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• Cast Object to JTable?

  - by Chris

  I am trying to implement a ListSelectionListener for some of my JTables. Simply (at the moment) the ListSelectionListener is supposed to simply return the text of the cell that was selected. My program design has several JTables and I would like to have one ListSelectionListener work for them all. In the valueChanged event of the ListSelectionListener I thought it was possible to do something like: private class SelectionHandler implements ListSelectionListener { public void valueChanged(ListSelectionEvent e) { JTable table = (JTable)e.getSource(); String data = (String) table.getValueAt(table.getSelectedRow(), 0); // Print data } } But when I do this I a ClassCastException error. Is there a way to do something like this? One solution I thought of was to compare the source of the event (e.getSource()) to all my JTables to see if they were equivalent (big if block) and then just calling .getValueAt inside that block but that would making the code in the future difficult if tables were to be added or removed.

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• Manually Adjusting UI for Rotation

  - by Driss Zouak

  In my view I have some number-pad type buttons that I want to manually adjust their X and Y when the view is rotated. I'm having trouble figuring out how to support this. I have added in my ViewDidLoad NSNotificationCenter.DefaultCenter.AddObserver("UIDeviceOrientationDidChangeNotification", DeviceRotated ); And I defined my DeviceRotated but the breakpoint is never hit. I thought this might be because of the Autorotate, so I overrided the ShouldAutorotateToInterfaceOrientation and set that to false (true didn't work either). I figured there should be some WillRotate (but that's a void return type) or something that would allow me to indicate that I want the View to rotate, and whatever is set to auto adjust I'd like it to do that, but that I would like to be able to manually adjust any other items that I need. If I have to do everything myself, that's fine as well. Any advice would be appreciated, Driss.

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• pointer being freed was not allocated

  - by kudorgyozo

  Hello i have the following error: malloc: * error for object 0x2087000: pointer being freed was not allocated * set a breakpoint in malloc_error_break to debug I have no idea what object that is. I don't know how to find it. Can anybody explain to me how (and where) to use malloc_history. I have set a breakpoint in malloc_error_break but i couldn't find out what object is at that address. I receive this after removing an object from an nsmutablearray and popping a view controller manually. If I comment out the line [reviewUpload.images removeObject: self.reviewUploadImg] it doesn't give me the error but of course it's not useful for me like that. - (void) removeImage { debugLog(@"reviewUploadImg %@", self.reviewUploadImg); debugLog(@"reviewUpload %@", self.reviewUpload); debugLog(@"reviewUploadImg thumb %@", self.reviewUploadImg.thumb); [reviewUpload.images removeObject: self.reviewUploadImg]; [self.navigationController popViewControllerAnimated:TRUE]; }

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• How can I change the value or a static char* from a function? C++

  - by flyout

  I am trying to change the value of a "static char *" I define at startup, I do it from inside a function, and when this function returns the var I am trying to re-set the value doesn't retain it. Example: static char *X = "test_1"; void testFunc() { char buf[256]; // fill buf with stuff... X = buf; } How can I achieve this without using static for buf? Should I use another datatype? if so, which one?

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• Record video file with 'thumbnail' image in Windows phone 8

  - by Deepak

  I'm trying to create a video capturing application store video file with 'thumbnail' image in Windows phone 8. I got some hint from the following link : How to get the thumbnail of a recorded video - windows phone 8?. But the result is quite annoying. I think there is some problem with the function. void captureSource_CaptureImageCompleted(object sender, CaptureImageCompletedEventArgs e) { using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication()) { WriteableBitmap wb = e.Result; string fileName = "CameraMovie.jpg"; if (isoStore.FileExists(fileName)) isoStore.DeleteFile(fileName); IsolatedStorageFileStream file = isoStore.CreateFile(fileName); Extensions.SaveJpeg(wb, file, wb.PixelWidth, wb.PixelHeight, 0, 85); file.Close(); captureSource.Stop(); fileSink.CaptureSource = null; fileSink.IsolatedStorageFileName = null; } } e.Result has some invalid data in it.while i bind it to an image control it shows some annoying image. Anyone please help me.

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• How can I access a global pointer outside of a C function?

  - by patrick

  I am trying to access the data of*tkn within a different function in my program for example: putchar(*tkn); It is a global variable but its not working correctly. Any ideas? #define MAX 20 // globals char *tkn; char array[MAX]; ... void tokenize() { int i = 0, j = 0; char *delim = " "; tkn = strtok (str," "); // get token 1 if (tkn != NULL) { printf("token1: "); while ((*tkn != 0) && (tkn != NULL)) { putchar(*tkn); array[i] = *tkn; *tkn++; i++; } } }

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• Flash AS3: automate property assignment to new instance from arguments in constructor

  - by matt lohkamp

  I like finding out about tricky new ways to do things. Let's say you've got a class with a property that gets set to the value of an argument in the constructor, like so: package{ public class SomeClass{ private var someProperty:*; public function SomeClass(_someProperty:*):void{ someProperty = _someProperty; } } } That's not exactly a hassle. But imagine you've got... I don't know, five properties. Ten properties, maybe. Rather then writing out each individual assignment, line by line, isn't there a way to loop through the constructor's arguments and set the value of each corresponding property on the new instance accordingly? I don't think that the ...rest or arguments objects will work, since they only keep an enumerated list of the arguments, not the argument names - I'm thinking something like this would be better: for(var propertyName:String in argsAsAssocArray){this[propertyName] = argsAsAssocArray[propertyName];} ... does something like this exist?

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• Can't inherit from auto_ptr without problems

  - by fret

  What I want to do is this: #include <memory> class autostr : public std::auto_ptr<char> { public: autostr(char *a) : std::auto_ptr<char>(a) {} autostr(autostr &a) : std::auto_ptr<char>(a) {} // define a bunch of string utils here... }; autostr test(char a) { return autostr(new char(a)); } void main(int args, char **arg) { autostr asd = test('b'); return 0; } (I actually have a copy of the auto_ptr class that handles arrays as well, but the same error applies to the stl one) The compile error using GCC 4.3.0 is: main.cpp:152: error: no matching function for call to `autostr::autostr(autostr)' main.cpp:147: note: candidates are: autostr::autostr(autostr&) main.cpp:146: note: autostr::autostr(char*) I don't understand why it's not matching the autostr argument as a valid parameter to autostr(autostr&).

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• Extension method question. Why do I need to use someObj = someObj.somemethod();

  - by Kettenbach

  Hi All, I have a simple extension method that I would like to use to add an item to an array of items. public static T[] addElement<T>(this T[] array, T elementToAdd) { var list = new List<T>(array) {elementToAdd}; return list.ToArray(); } this works ok, but when I use it, I am having to set the array equal to the return value. I see that I am returning an Array. I likely want this method to be void, but I would like the item added. Does anyone have any ideas on what I need to do , to make this work the way I am wanting? Instead of someArray = someArray.addElement(item), I just want to do someArray.addElement(item) and then someArray be ready to go. What am I missing here? Thanks, ~ck in San Diego

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• Running a java program in linux terminal with -class path

  - by Arya

  Hello I've been trying for an hour to run the following program with a the postgresql classpath class Test{ public static void main(String[] args){ try { Class.forName("org.postgresql.Driver"); } catch (ClassNotFoundException cnfe) { System.err.println("Couldn't find Postgresql driver class!"); } } } The program compiled fine with the javac command, but I'm having a hard time running it with the postgresql classpath. I have "postgresql-9.0-801.jdbc4.jar" in the same directory as the file and I tried the following, but non of them worked java -classpath ./postgresql-9.0-801.jdbc4.jar Test java -classpath postgresql-9.0-801.jdbc4.jar Test java -classpath "postgresql-9.0-801.jdbc4.jar" Test What am I doing wrong? Regards!

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• In C++, what is the "order of precedence" for shadowed variable names?

  - by Emile Cormier

  In C++, what is the "order of precedence" for shadowed variable names? I can't seem to find a concise answer online. For example: #include <iostream> int shadowed = 1; struct Foo { Foo() : shadowed(2) {} void bar(int shadowed = 3) { std::cout << shadowed << std::endl; // What does this output? } int shadowed; }; int main() { Foo().bar(); } I can't think of any other scopes where a variable might conflict. Please let me know if I missed one.

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• Are memory barriers necessary for atomic reference counting shared immutable data?

  - by Dietrich Epp

  I have some immutable data structures that I would like to manage using reference counts, sharing them across threads on an SMP system. Here's what the release code looks like: void avocado_release(struct avocado *p) { if (atomic_dec(p->refcount) == 0) { free(p->pit); free(p->juicy_innards); free(p); } } Does atomic_dec need a memory barrier in it? If so, what kind of memory barrier? Additional notes: The application must run on PowerPC and x86, so any processor-specific information is welcomed. I already know about the GCC atomic builtins. As for immutability, the refcount is the only field that changes over the duration of the object.

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• How do you do masked password entry on windows using character overwriting?

  - by Erick

  Currently I am using this implementation to hide user input during password entry: void setEcho(bool enable) { HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE); DWORD mode; GetConsoleMode(hStdin, &mode); if(enable) { mode |= ENABLE_ECHO_INPUT; } else { mode &= ~ENABLE_ECHO_INPUT; } SetConsoleMode(hStdin, mode); } The user needs to be able to have positive feed back that text entry is being made. What techniques are available in a Win32 environment using C++?

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• How to pass event to method?

  - by tomaszs

  I would like to create a method that takes as a argument an event an adds eventHandler to it to handle it properly. Like this: I have 2 events: public event EventHandler Click; public event EventHandler Click2; Now i would like to pass particular event to my method like this (pseudocode): public AttachToHandleEvent(EventHandler MyEvent) { MyEvent += Item_Click; } private void Item_Click(object sender, EventArgs e) { MessageBox.Show("lalala"); } ToolStripMenuItem tool = new ToolStripMenuItem(); AttachToHandleEvent(tool.Click); Is it possible or do I not understand it good? Edit: I've noticed with help of you that this code worked fine, and returned to my project and noticed that when I pass event declared in my class it works, but when I pass event from other class id still does not work. Updated above example to reflect this issue. What I get is this error: The event 'System.Windows.Forms.ToolStripItem.Click' can only appear on the left hand side of += or -=

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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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• What's wrong with my logic (Java syntax)

  - by soda

  I'm trying to make a simple program that picks a random number and takes input from the user. The program should tell the user if the guess was hot (-/+ 5 units) or cold, but I never reach the else condition. Here's the section of code: public static void giveHint (int guess) { int min = guess - 5; int max = guess + 5; if ((guess > min) && (guess < max)) { System.out.println("Hot.."); } else { System.out.println("Cold.."); } }

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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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• Session is null when inherit from System.Web.UI.Page

  - by Andreas K.

  I want to extend the System.Web.UI.Page-class with some extra stuff. In the ctor I need the value of a session-variable. The problem is that the Session-object is null... public class ExtendedPage : System.Web.UI.Page { protected foo; public ExtendedPage() { this.foo = (int)HttpContext.Current.Session["foo"]; // NullReferenceException } } If I move the part with the session-object into the Load-Event everything works fine... public class ExtendedPage : System.Web.UI.Page { protected foo; public ExtendedPage() { this.Load += new EventHandler(ExtendedPage_Load); } void ExtendedPage_Load(object sender, EventArgs e) { this.foo = (int)HttpContext.Current.Session["foo"]; } } Why is the Session-object null in the first case??

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