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  • JQuery ajax request returns error and status 0

    - by Kucebe
    I use this pseudo-class to make ajax request to server: function RequestManager(url, params, success, error){ //save this ajax configuration this._ajaxCall = null; this._url= url; this._type = params.type; this._timer = params.timer || 0; this._success = function(){ alert("ok"); }; this._error = function(){ alert("ko"); }; } RequestManager.prototype = { require : function(tag){//here there will be a tag object in array format if(this.timer>0){ //wait this.timer } if(this.ajaxCall != null ){ this.ajaxCall.abort(); this.ajaxCall = null; } var self = this; this.ajaxCall = $.ajax({ url: this._url, type: this._type, data: tag, success: function(xmlResponse){ var responseArray = []; var response = _extractElements(xmlResponse, arrayResponse); self._success(response); }, error: self._error, complete : function(xhr, statusText){ alert(xhr.status); return null; } }); } When i instantiate a new object, and i use it to load a request, it always return to me error, and status code is 0. Server correctly generates an xml document. Why i can't get a correct 200 code back?

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  • Symfony / Doctrine - How to filter form field by property in related model

    - by Dan
    I have a UserForm class which has a select list populated from a related model (specified by a foreign relationship in the yml) like so: $this->setWidget('report_id', new sfWidgetFormDoctrineChoice(array('model' => $this->getRelatedModelName('Report')))); I'd like to filter the Report objects that come from this relation by one of the Report fields, "active" such that only Reports with active=1 appear in the form. I have a method, ReportTable::GetActiveReports() that performs the appropriate query and returns the filtered reports. So one option is to populate the Widget with the results of that function. Any tips on the syntax to do that? It seems to me the cleaner way is to use the UserFormFilter class to filter the reports by active=1 there. Unfortunately I couldn't find any documentation on how to use form filters (or really what they are), so maybe this is not the right solution. Is a Form Filter the appropriate tool for this job? It seems I should use the Doctrine_Record_Filter_Standard class as defined here: http://www.doctrine-project.org/api/orm/1.2/doctrine/doctrine_record_filter_standard.html But it's not clear to me the appropriate usage. Any guidance would be helpful. Thanks! Dan

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  • Any way for a class to prevent outside code from declaring variables of its type?

    - by supercat
    Is it possible for a class of exposing a type for function returns, without allowing users of that class to create variables of that type? A couple usage scenarios: A Fluent interface on a large class; a statement like "foo=bar.WithX(5).WithY(9).WithZ(19);" would be inefficient if it had to create three new instances of the class, but could be much more efficient if the WithX could create one instance, and the other statements could simply use it. A class may wish to support a statement like "foo[19].x = 9;" even when foo itself isn't an array, and does not hold the data in class instances that can be exposed to the public; one way to do that is to have foo[19] return a struct which holds a reference to 'foo' and the value '19', and has a member property 'x' which could call "foo.SetXValue(19, 9);" Such a struct could have a conversion operator to convert itself to the "apparent" type of foo[19]. In both of these scenarios, storing the value returned by a method or property into a variable and then using it more than once would cause strange behavior. It would be desirable if the designer of the class exposing such methods or properties could ensure that callers wouldn't be able to use them more than once. Is there any practical way to accomplish that?

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  • iPhone openGLES performance tuning

    - by genesys
    Hey there! I'm trying now for quite a while to optimize the framerate of my game without really making progress. I'm running on the newest iPhone SDK and have a iPhone 3G 3.1.2 device. I invoke arround 150 drawcalls, rendering about 1900 Triangles in total (all objects are textured using two texturelayers and multitexturing. most textures come from the same textureAtlasTexture stored in pvrtc 2bpp compressed texture). This renders on my phone at arround 30 fps, which appears to me to be way too low for only 1900 triangles. I tried many things to optimize the performance, including batching together the objects, transforming the vertices on the CPU and rendering them in a single drawcall. this yelds 8 drawcalls (as oposed to 150 drawcalls), but performance is about the same (fps drop to arround 26fps) I'm using 32byte vertices stored in an interleaved array (12bytes position, 12bytes normals, 8bytes uv). I'm rendering triangleLists and the vertices are ordered in TriStrip order. I did some profiling but I don't really know how to interprete it. instruments-sampling using Instruments and Sampling yelds this result: http://neo.cycovery.com/instruments_sampling.gif telling me that a lot of time is spent in "mach_msg_trap". I googled for it and it seems this function is called in order to wait for some other things. But wait for what?? instruments-openGL instruments with the openGL module yelds this result: http://neo.cycovery.com/intstruments_openglES_debug.gif but here i have really no idea what those numbers are telling me shark profiling: profiling with shark didn't tell me much either: http://neo.cycovery.com/shark_profile_release.gif the largest number is 10%, spent by DrawTriangles - and the whole rest is spent in very small percentage functions Can anyone tell me what else I could do in order to figure out the bottleneck and could help me to interprete those profiling information? Thanks a lot!

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  • process csv in scala

    - by portoalet
    I am using scala 2.7.7, and wanted to parse CSV file and store the data in SQLite database. I ended up using OpenCSV java library to parse the CSV file, and using sqlitejdbc library. Using these java libraries makes my scala code looks almost identical to that of Java code (sans semicolon and with val/var) As I am dealing with java objects, I can't use scala list, map, etc, unless I do scala2java conversion or upgrade to scala 2.8 Is there a way I can simplify my code further using scala bits that I don't know? val filename = "file.csv"; val reader = new CSVReader(new FileReader(filename)) var aLine = new Array[String](10) var lastSymbol = "" while( (aLine = reader.readNext()) != null ) { if( aLine != null ) { val symbol = aLine(0) if( !symbol.equals(lastSymbol)) { try { val rs = stat.executeQuery("select name from sqlite_master where name='" + symbol + "';" ) if( !rs.next() ) { stat.executeUpdate("drop table if exists '" + symbol + "';") stat.executeUpdate("create table '" + symbol + "' (symbol,data,open,high,low,close,vol);") } } catch { case sqle : java.sql.SQLException => println(sqle) } lastSymbol = symbol } val prep = conn.prepareStatement("insert into '" + symbol + "' values (?,?,?,?,?,?,?);") prep.setString(1, aLine(0)) //symbol prep.setString(2, aLine(1)) //date prep.setString(3, aLine(2)) //open prep.setString(4, aLine(3)) //high prep.setString(5, aLine(4)) //low prep.setString(6, aLine(5)) //close prep.setString(7, aLine(6)) //vol prep.addBatch() prep.executeBatch() } } conn.close()

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  • How to pass SAFEARRAY of UDTs to unmaged code from C#.

    - by themilan
    I also used VT_RECORD. But didn't got success in passing safearray of UDTs. [ComVisible(true)] [StructLayout(LayoutKind.Sequential)] public class MY_CLASS { [MarshalAs(UnmanagedType.U4)] public Int32 width; [MarshalAs(UnmanagedType.U4)] public Int32 height; }; [DllImport("mydll.dll")] public static extern Int32 GetTypes( [In, Out][MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_RECORD, SafeArrayUserDefinedSubType = typeof(MY_CLASS))]MY_CLASS[] myClass, [In, Out][MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_RECORD, SafeArrayUserDefinedSubType = typeof(Guid))]Guid[] guids ); If i communicate with my unmanaged code without 1st parameter, Then there is no error in passing "guids" parameter to unmanaged code. I also able to cast elements of obtained SAFEARRAY at unmanaged side to GUID type. But If i tried to pass my UDT class MY_CLASS to unmanaged code with SAFEARRAY then it fails on managed code. (as above code snippet) It shows exception "An unhandled exception of type 'System.Runtime.InteropServices.SafeArrayTypeMismatchException' occurred in myapp.exe" "Additional information: Specified array was not of the expected type." Plz help me in such a situation to pass SAFEARRAY of UDTs to unmaged code.

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  • Hidden features of Perl?

    - by Adam Bellaire
    What are some really useful but esoteric language features in Perl that you've actually been able to employ to do useful work? Guidelines: Try to limit answers to the Perl core and not CPAN Please give an example and a short description Hidden Features also found in other languages' Hidden Features: (These are all from Corion's answer) C# Duff's Device Portability and Standardness Quotes for whitespace delimited lists and strings Aliasable namespaces Java Static Initalizers JavaScript Functions are First Class citizens Block scope and closure Calling methods and accessors indirectly through a variable Ruby Defining methods through code PHP Pervasive online documentation Magic methods Symbolic references Python One line value swapping Ability to replace even core functions with your own functionality Other Hidden Features: Operators: The bool quasi-operator The flip-flop operator Also used for list construction The ++ and unary - operators work on strings The repetition operator The spaceship operator The || operator (and // operator) to select from a set of choices The diamond operator Special cases of the m// operator The tilde-tilde "operator" Quoting constructs: The qw operator Letters can be used as quote delimiters in q{}-like constructs Quoting mechanisms Syntax and Names: There can be a space after a sigil You can give subs numeric names with symbolic references Legal trailing commas Grouped Integer Literals hash slices Populating keys of a hash from an array Modules, Pragmas, and command-line options: use strict and use warnings Taint checking Esoteric use of -n and -p CPAN overload::constant IO::Handle module Safe compartments Attributes Variables: Autovivification The $[ variable tie Dynamic Scoping Variable swapping with a single statement Loops and flow control: Magic goto for on a single variable continue clause Desperation mode Regular expressions: The \G anchor (?{}) and '(??{})` in regexes Other features: The debugger Special code blocks such as BEGIN, CHECK, and END The DATA block New Block Operations Source Filters Signal Hooks map (twice) Wrapping built-in functions The eof function The dbmopen function Turning warnings into errors Other tricks, and meta-answers: cat files, decompressing gzips if needed Perl Tips See Also: Hidden features of C Hidden features of C# Hidden features of C++ Hidden features of Java Hidden features of JavaScript Hidden features of Ruby Hidden features of PHP Hidden features of Python

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  • UITableViewController not redrawing new cell text label after popViewControllerAnimated

    - by crunchyt
    I have a problemetic UITableViewController fails to redraw an updated cell after a child view is removed. Here's what's happening. After changing data in a child view, the parent view controller reloads the source data array and runs [tableView reloadData] via a PostNotification. After this triggers, I use popViewControllerAnimated to return to the parent UITableViewController (this pops the child view off the stack, and reveals the controller one level up). However, my updated data does not appear in the parent view controller! According to the debugger, the cell's label has been updated, but the visible label does not change. However, if I scroll-flick the table, momentarily moving the updated cell out of view, when it reappears the label is updated! I also try calling [tableView reloadData] via viewWillAppear but the issue still persists. Here is some additional info that may be helpful. I have a 3 views structured like this: 1/ SettingsViewController : UITableViewController 2/ -- UserView : UITableViewController 3/ ---- UserDetailsView : UIViewController <UIActionSheetDelegate> I am calling UserDetailsView from inside UserView as follows: UserDetailsView *userDetailsView = [[UserDetailsView alloc] init]; [self.navigationController pushViewController:userDetailsView animated:YES]; If I return to the top-most controller (SettingsViewController) and then load the problematic controller (UserView), everything is drawn correctly. It is only when returning from a child view that this issue occurs. Thank you in advance for your suggestions.

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  • How to not persist NSManagedObjects retrieved from NSManagedObjectContext

    - by RickiG
    Hi I parse an xml file containing books, for each new node I go: Book *book = (Book*)[NSEntityDescription insertNewObjectForEntityForName:@"Book" inManagedObjectContext:managedObjectContext]; To obtain an NSManagedObject of my Core Data Book Entity, I then proceed to populate the managed Book object with data, add it to an array, rinse, repeat. When I am done, I present the list of books to the user. I have not yet executed the save: NSError *error; if (![managedObjectContext save:&error]) { NSLog(@"%@", [error domain]); } The user now selects one of the books, this one I would like to persist, but only this one, all the other books are of no interest to me any more. The Book Entity does not have/or is part of any relationships. It is just a "single" Entity. If I pull the "save lever" every Book object will be persisted and I will have to delete everything but my desired one. How would I get around this challenge, I can't really seem to find that particular use-case in the Core Data Programming Guide, which sort of also bugs me a bit, am I going against best practice here? Thanks for any help given.

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  • Form repeats values

    - by Tunji Gbadamosi
    I have a dynamically generated form to accept guest details and store the results into the a session array. However, when I retrieve the details, I keep finding that the last two guest details are always the same even though different inputs were given. Here's my form for getting the values (guests.php): <?php session_start(); require_once 'FormDB.php'; include 'connect.php'; include 'guests_.php'; ?> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Enter guest details</title> <script language="JavaScript" type="text/javascript" src="validation_functions.js"></script> </head> <body> <?php if($_SESSION['logged_in']){ //print '<script type="text/javascript">'; //print 'alert("You have successfully logged in '. $_SESSION['volunteer']['first_name'].'")'; //print '</script>'; $first_name="first_name"; $surname="surname"; $sex="sex"; $age = "age"; echo $error; //echo '<form name="choose" action="tables.php" method="post" onsubmit="return validate_guests(this);">'; echo '<form name="choose" action="guests.php" method="post" onsubmit="return validate_guests(this);">'; echo '<input type="hidden" name="hidden_value" value="'.$_SESSION['no_guests'].'" />'; if($_SESSION['no_guests'] >= 1){ echo '<table border="1">'; echo '<th>First Name</th>'; echo '<th>Surname</th>'; echo '<th>Day of Birth</th>'; echo '<th>Month of Birth</th>'; echo '<th>Year of Birth</th>'; echo '<th>Sex</th>'; //echo '<div id="volunteer">'; echo '<tr>'; echo '<td>'; echo $_SESSION['volunteer']['first_name']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['surname']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_day']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_month']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_year']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['sex']; echo '</td>'; echo '</tr>'; //echo '</div>'; for($i=0;$i<$_SESSION['no_guests'];$i++){ //$guest = "guest_".$i; //echo '<div class="'.$guest.'">'; echo '<tr>'; echo '<td>'; echo '<input type="text" name="guest['.$i.']['.$first_name.']" id="fn'.$i.'">'; echo '</td>'; echo '<td>'; echo '<input type="text" name="guest['.$i.']['.$surname.']" id="surname'.$i.'">'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_day]" id="dob_day'.$i.'">'; for($j=1;$j<32;$j++){ echo"<option value='$j'>$j</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_month] id="dob_month'.$i.'">'; for($j=0;$j<sizeof($month);$j++){ $value = ($j + 1); echo"<option value='$value'>$month[$j]</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.'][dob_year] id="dob_year'.$i.'">'; for($j=1900;$j<$year_limit;$j++){ echo"<option value='$j'>$j</option>"; } echo '</select>'; echo '</td>'; echo '<td>'; echo '<select name="guest['.$i.']['.$sex.']" id="sex'.$i.'">'; echo '<option>Female</option>'; echo '<option>Male</option>'; echo '</select>'; echo '</td>'; echo '</tr>'; //echo '</div>'; } echo '</table>'; } else{ echo '<table border="1">'; echo '<th>First Name</th>'; echo '<th>Surname</th>'; echo '<th>Day of Birth</th>'; echo '<th>Month of Birth</th>'; echo '<th>Year of Birth</th>'; echo '<th>Sex</th>'; echo '<th>Table</th>'; echo '<th>Seat</th>'; echo '<th>Menu</th>'; //echo '<div id="volunteer">'; echo '<tr>'; echo '<td>'; echo $_SESSION['volunteer']['first_name']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['surname']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_day']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_month']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['dob_year']; echo '</td>'; echo '<td>'; echo $_SESSION['volunteer']['sex']; echo '</td>'; echo '</tr>'; //echo '</div>'; } echo '</table>'; echo '<input type="submit" value="Submit">'; echo '</form>'; } else{ print '<script type="text/javascript">'; print 'alert("You have not successfully logged in '. $_SESSION['volunteer']['first_name'].'")'; print '</script>'; } ?> </body> Here's my code for processing the details (guests_.php): <?php $error = ""; if($_POST){ //$guests = array(); $guests = isset($_POST['guest']) ? $_POST['guest'] : null; if($guests){ foreach($guests as &$guest){ $guest['first_name'] = ucwords(strip_tags($guest['first_name'])); $guest['surname'] = ucwords(strip_tags($guest['surname'])); $guest['dob_day'] = ucwords(strip_tags($guest['dob_day'])); $guest['dob_month'] = ucwords(strip_tags($guest['dob_month'])); $guest['dob_year'] = ucwords(strip_tags($guest['dob_year'])); $guest['sex'] = ucwords(strip_tags($guest['sex'])); } } foreach($guests as $guest){ $date = $form->create_date($guest['dob_day'], $guest['dob_month'], $guest['dob_year']); $exist = $form->user_exists($guest['first_name'], $guest['surname'], $date, $guest['sex']); if($exist != ""){ $error .= $exist; } } if($error == ""){ //$_SESSION['existent_guests'] = FALSE; $_SESSION['guests'] = $guests; $form->set_guests($_SESSION['guests']); //$form->set_volunteer($_SESSION['volunteer']); header("location: tables.php"); exit(); } } ?>

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  • Raytracing (LoS) on 3D hex-like tile maps

    - by herenvardo
    Greetings, I'm working on a game project that uses a 3D variant of hexagonal tile maps. Tiles are actually cubes, not hexes, but are laid out just like hexes (because a square can be turned to a cube to extrapolate from 2D to 3D, but there is no 3D version of a hex). Rather than a verbose description, here goes an example of a 4x4x4 map: (I have highlighted an arbitrary tile (green) and its adjacent tiles (yellow) to help describe how the whole thing is supposed to work; but the adjacency functions are not the issue, that's already solved.) I have a struct type to represent tiles, and maps are represented as a 3D array of tiles (wrapped in a Map class to add some utility methods, but that's not very relevant). Each tile is supposed to represent a perfectly cubic space, and they are all exactly the same size. Also, the offset between adjacent "rows" is exactly half the size of a tile. That's enough context; my question is: Given the coordinates of two points A and B, how can I generate a list of the tiles (or, rather, their coordinates) that a straight line between A and B would cross? That would later be used for a variety of purposes, such as determining Line-of-sight, charge path legality, and so on. BTW, this may be useful: my maps use the (0,0,0) as a reference position. The 'jagging' of the map can be defined as offsetting each tile ((y+z) mod 2) * tileSize/2.0 to the right from the position it'd have on a "sane" cartesian system. For the non-jagged rows, that yields 0; for rows where (y+z) mod 2 is 1, it yields 0.5 tiles. I'm working on C#4 targeting the .Net Framework 4.0; but I don't really need specific code, just the algorithm to solve the weird geometric/mathematical problem. I have been trying for several days to solve this at no avail; and trying to draw the whole thing on paper to "visualize" it didn't help either :( . Thanks in advance for any answer

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  • Why is setting HTML5's CanvasPixelArray values ridiculously slow and how can I do it faster?

    - by Nixuz
    I am trying to do some dynamic visual effects using the HTML 5 canvas' pixel manipulation, but I am running into a problem where setting pixels in the CanvasPixelArray is ridiculously slow. For example if I have code like: imageData = ctx.getImageData(0, 0, 500, 500); for (var i = 0; i < imageData.length; i += 4){ imageData.data[i] = buffer[i]; imageData.data[i + 1] = buffer[i + 1]; imageData.data[i + 2] = buffer[i + 2]; } ctx.putImageData(imageData, 0, 0); Profiling with Chrome reveals, it runs 44% slower than the following code where CanvasPixelArray is not used. tempArray = new Array(500 * 500 * 4); imageData = ctx.getImageData(0, 0, 500, 500); for (var i = 0; i < imageData.length; i += 4){ tempArray[i] = buffer[i]; tempArray[i + 1] = buffer[i + 1]; tempArray[i + 2] = buffer[i + 2]; } ctx.putImageData(imageData, 0, 0); My guess is that the reason for this slowdown is due to the conversion between the Javascript doubles and the internal unsigned 8bit integers, used by the CanvasPixelArray. Is this guess correct? Is there anyway to reduce the time spent setting values in the CanvasPixelArray?

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  • Vector is pointing to uninitialized bytes when used in recvfrom call

    - by Adam A.
    In a function that I am writing I am trying to return a pointer to a vector of unsigned chars. The relevant code is below. std::vector<unsigned char> *ret = new std::vector<unsigned char>(buffSize,'0'); int n = recvfrom(fd_, &((*ret)[0]) ,buffSize, &recvAddress, &sockSize); //This should work too... recvfrom(fd_, ret ,buffSize, &recvAddress, &sockSize); // display chars somehow just for testing for(std::vector<unsigned char>::iterator it=ret->begin(); it<it->end();i++) { std::cout<<*it; } std::cout<<std::endl; ... return ret; When I run this through valgrind I get errors talking about how the buffer in recvfrom is pointing to uninitialized bytes. I've narrowed this down to the vector since I swapped it out for an unsigned char array and everything works fine. Any suggestions?

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  • Indy Write Buffering / Efficient TCP communication

    - by Smasher
    I know, I'm asking a lot of questions...but as a new delphi developer I keep falling over all these questions :) This one deals with TCP communication using indy 10. To make communication efficient, I code a client operation request as a single byte (in most scenarios followed by other data bytes of course, but in this case only one single byte). Problem is that var Bytes : TBytes; ... SetLength (Bytes, 1); Bytes [0] := OpCode; FConnection.IOHandler.Write (Bytes, 1); ErrorCode := Connection.IOHandler.ReadByte; does not send that byte immediately (at least the servers execute handler is not invoked). If I change the '1' to a '9' for example everything works fine. I assumed that Indy buffers the outgoing bytes and tried to disable write buffering with FConnection.IOHandler.WriteBufferClose; but it did not help. How can I send a single byte and make sure that it is immediatly sent? And - I add another little question here - what is the best way to send an integer using indy? Unfortunately I can't find function like WriteInteger in the IOHandler of TIdTCPServer...and WriteLn (IntToStr (SomeIntVal)) seems not very efficient to me. Does it make a difference whether I use multiple write commands in a row or pack things together in a byte array and send that once? Thanks for any answers! EDIT: I added a hint that I'm using Indy 10 since there seem to be major changes concerning the read and write procedures.

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  • Handling mach exceptions in 64bit OS X application

    - by Brad S
    I have been able to register my own mach port to capture mach exceptions in my applications and it works beautifully when I target 32 bit. However when I target 64 bit, my exception handler catch_exception_raise() gets called but the array of exception codes that is passed to the handler are 32 bits wide. This is expected in a 32 bit build but not in 64 bit. In the case where I catch EXC_BAD_ACCESS the first code is the error number and the second code should be the address of the fault. Since the second code is 32 bits wide the high 32 bits of the 64 bit fault address is truncated. I found a flag in <mach/exception_types.h> I can pass in task_set_exception_ports() called MACH_EXCEPTION_CODES which from looking at the Darwin sources appears to control the size of the codes passed to the handler. It looks like it is meant to be ored with the behavior passed in to task_set_exception_ports(). However when I do this and trigger an exception, my mach port gets notified, I call exc_server() but my handler never gets called, and when the reply message is sent back to the kernel I get the default exception behavior. I am targeting the 10.6 SDK. I really wish apple would document this stuff better. Any one have any ideas?

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  • Android: writing a file to sdcard

    - by Sumit M Asok
    I'm trying to write a file from an Http post reply to a file on the sdcard. Everything works fine until the byte array of data is retrieved. I've tried setting WRITE_EXTERNAL_STORAGE permission in the manifest and tried many different combinations of tutorials I found on the net. All I could find was using the openFileOutput("",MODE_WORLD_READABLE) method, of the activity but how my app writes file is by using a thread. Specifically, a thread is invoked from another thread when a file has to be written, so giving an activity object didn't work even though I tried it. The app has come a long way and I cannot change how the app is currently written. Please, someone help me? CODE: File file = new File(bgdmanip.savLocation); FileOutputStream filecon = null; filecon = new FileOutputStream(file); // bgdmanip.savLocation holds the whole files path byte[] myByte; myByte = Base64Coder.decode(seReply); Log.d("myBytes", String.valueOf(myByte)); bos.write(myByte); filecon.write(myByte); myvals = x * 11024; seReply is a string reply from HttpPost response. the second set of code is looped with reference to x. the file is created but remains 0 bytes

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  • Passing a NSArray between classes

    - by Althane
    So, my second question based off of this application I'm teaching myself Objective C with. I have a Data Source class, which for now looks mostly like: - (id) init { if (self = [super init]){ listNames = [[NSArray alloc] initWithObjects: @"Grocery", @"Wedding", @"History class",@"CS Class",@"Robotics",@"Nuclear Sciences", @"Video",@"Library",@"Funeral", nil]; NSLog(@"%@",listNames); } return self; } The .h looks as follows: @interface MainViewDataSource : NSObject { NSArray *listNames; } @property (nonatomic, retain) NSArray *listNames; -(NSArray *)getListNames; So that's where I make it. Now the problem is that when I try to get the array listNames, it returns nothing. The following piece: NSArray* data = [listData listNames]; Is supposed to put the information in listNames in data, but... isn't. Since I'm rather used to JAva, I'm betting this is an Objective C quirk that I don't know how to fix. Which is why I'd be here asking for help. What's the proper way to pass around NSArrays like this?

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  • Can't get any speedup from parallelizing Quicksort using Pthreads

    - by Murat Ayfer
    I'm using Pthreads to create a new tread for each partition after the list is split into the right and left halves (less than and greater than the pivot). I do this recursively until I reach the maximum number of allowed threads. When I use printfs to follow what goes on in the program, I clearly see that each thread is doing its delegated work in parallel. However using a single process is always the fastest. As soon as I try to use more threads, the time it takes to finish almost doubles, and keeps increasing with number of threads. I am allowed to use up to 16 processors on the server I am running it on. The algorithm goes like this: Split array into right and left by comparing the elements to the pivot. Start a new thread for the right and left, and wait until the threads join back. If there are more available threads, they can create more recursively. Each thread waits for its children to join. Everything makes sense to me, and sorting works perfectly well, but more threads makes it slow down immensely. I tried setting a minimum number of elements per partition for a thread to be started (e.g. 50000). I tried an approach where when a thread is done, it allows another thread to be started, which leads to hundreds of threads starting and finishing throughout. I think the overhead was way too much. So I got rid of that, and if a thread was done executing, no new thread was created. I got a little more speedup but still a lot slower than a single process. The code I used is below. http://pastebin.com/UaGsjcq2 Does anybody have any clue as to what I could be doing wrong?

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  • NullPointerException and the best way to deal with it

    - by lupin
    Note: This is homework/assignment feel not to answer if you don't want to. Ok after some search and reading these: http://stackoverflow.com/questions/425439/how-to-check-if-array-element-is-null-to-avoid-nullpointerexception-in-java http://stackoverflow.com/questions/963936/gracefully-avoiding-nullpointerexception-in-java http://c2.com/cgi/wiki?NullPointerException Am still not making any progress on how to deal with NullPointerException error on my code, snippet for questionable code: int findElement(String element) { int retval = 0; for ( int i = 0; i < setElements.length; i++) { if ( setElements[i].equals(element) ) { // This line 31 here return retval = i; } else { return retval = -1; } } return retval; } void add(String newValue) { int elem = findElement(newValue); if( numberOfElements < maxNumberOfElements && elem != -1 ) { setElements[numberOfElements] = newValue; numberOfElements++; } else { System.out.println("Element " + newValue + "already exist"); } } It compile but adding new element to a set throws a NullPointerException error. D:\javaprojects>java SetDemo Enter string element to be added A You entered A Exception in thread "main" java.lang.NullPointerException at Set.findElement(Set.java:31) at Set.add(Set.java:44) at SetDemo.main(Set.java:145) I added another check, though honestly don't have clue if this right to line 31. if ( setElements != null && setElements[i].equals(element) ) but still no joy. A documentation/tips or explanation is greatly appreciated. learning, lupin

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  • Laravel - public layout not needed in every function

    - by fischer
    I have just recently started working with Laravel. Great framework so far! However I have a question. I am using a layout template like this: public $layout = 'layouts.private'; This is set in my Base_Controller: public function __construct(){ //Styles Asset::add('reset', 'css/reset.css'); Asset::add('main', 'css/main.css'); //Scripts Asset::add('jQuery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js'); //Switch layout template according to the users auth credentials. if (Auth::check()) { $this -> layout = 'layouts.private'; } else { $this -> layout = 'layouts.public'; } parent::__construct(); } However I get an error exception now when I try to access functions in my diffrent controllers, which should not call any view, i.e. when a user is going to login: class Login_Controller extends Base_Controller { public $restful = true; public function post_index() { $user = new User(); $credentials = array('username' => Input::get('email'), 'password' => Input::get('password')); if (Auth::attempt($credentials)) { } else { } } } The error I get, is that I do not set the content of the different variables in my public $layout. But since no view is needed in this function, how do I tell Laravel not to include the layout in this function? The best solution that I my self have come a cross (don't know if this is a bad way?) is to unset($this -> layout); from function post_index()... To sum up my question: how do I tell Laravel not to include public $layout in certain functions, where a view is not needed? Thanks in advance, fischer

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  • Unable to run Ajax Minifier as post-build in Visual Studio.

    - by James South
    I've set up my post build config as demonstrated at http://www.asp.net/ajaxlibrary/ajaxminquickstart.ashx I'm getting the following error though: The "JsSourceFiles" parameter is not supported by the "AjaxMin" task. Verify the parameter exists on the task, and it is a settable public instance property. My configuration settings...... <Import Project="$(MSBuildExtensionsPath)\Microsoft\MicrosoftAjax\ajaxmin.tasks" /> <Target Name="AfterBuild"> <ItemGroup> <JS Include="**\*.js" Exclude="**\*.min.js" /> </ItemGroup> <ItemGroup> <CSS Include="**\*.css" Exclude="**\*.min.css" /> </ItemGroup> <AjaxMin JsSourceFiles="@(JS)" JsSourceExtensionPattern="\.js$" JsTargetExtension=".min.js" CssSourceFiles="@(CSS)" CssSourceExtensionPattern="\.css$" CssTargetExtension=".min.css" /> </Target> I had a look at the AjaxMinTask.dll with reflector and noted that the publicly exposed properties do not match the ones in my config. There is an array of ITaskItem called SourceFiles though so I edited my configuration to match. <Import Project="$(MSBuildExtensionsPath)\Microsoft\MicrosoftAjax\ajaxmin.tasks" /> <Target Name="AfterBuild"> <ItemGroup> <JS Include="**\*.js" Exclude="**\*.min.js" /> </ItemGroup> <ItemGroup> <CSS Include="**\*.css" Exclude="**\*.min.css" /> </ItemGroup> <AjaxMin SourceFiles="@(JS);@(CSS)" SourceExtensionPattern="\.js$;\.css$" TargetExtension=".min.js;.min.css"/> </Target> I now get the error: The "SourceFiles" parameter is not supported by the "AjaxMin" task. Verify the parameter exists on the task, and it is a settable public instance property. I'm scratching my head now. Surely it should be easier than this? I'm running Visual Studio 2010 Ultimate on a Windows 7 64 bit installation.

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  • undefined method `build_users' with nested models

    - by Cédric
    I've got into trouble with nested attributes. Here is my Account model : class Account < ActiveRecord::Base has_many :products has_many :blogs has_many :openings has_many :users has_one :logo, :class_name => "AccountPicture" has_one :address, :class_name => "AccountAddress" has_and_belongs_to_many :options accepts_nested_attributes_for :logo, :allow_destroy => true accepts_nested_attributes_for :address, :allow_destroy => true accepts_nested_attributes_for :users, :allow_destroy => true end And here is my User model : class User < ActiveRecord::Base belongs_to :account end As you can see, Account accepts nested attributes for logo, address, and users. While testing, i can use nested attributes for logo and address, but not for user. a = Account.new => #<Account id: nil, hostname: nil, subdomain: nil, name: nil, description: nil, base_line: nil, footer: nil, phone_number: nil, mobile_number: nil, email_address: nil, created_at: nil, updated_at: nil> # building the address works fine >> a.build_address => #<AccountAddress id: nil, account_id: nil, country: nil, state: nil, county: nil, city: nil, suburb: nil, zipcode: nil, street: nil, streetno: nil, longitude: nil, latitude: nil, error_code: nil> # building the users fails >> a.build_users NoMethodError: undefined method `build_users' for #<Account:0x7f6862a5f948> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/attribute_methods.rb:260:in `method_missing' from (irb):2 Thus, in my views, when i use the nested forms, i got this error back : User(#69850615730460) expected, got Array(#69850664775200) Any help would be appreciated. Thanks.

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  • How to add a badge to the system generated "More" UITabBarItem

    - by Mark Hoffman
    My app has 6 menu items, so the OS shows the first 4, then shows a "More" item that links to a screen where the user can select the other two. My problem is that I want to show a badge on the More item so that the user knows that one of the menu items that is hidden needs their attention. (It's clear to our users which hidden item the badge represents since one of the hidden items is Settings and the other is current Uploads) I don't know how to access the "More" item since the "items" array on UITabBar only contains the 6 actual UITabBarItems that I've created; it doesn't include the system generated "More" item. I've tried setting the badge on one of the hidden UITabBarItems, but no badge is ever displayed. I didn't find much on Google, which makes me wonder if I'm going about this completely wrong. The iTunes app does the same thing when you download items. They display a More item and attach a badge to it, so I figured I was in good company, but I'll be damned if I see how they did that. (Unless they manually created a UITabBarSystemItemMore item and manually handled displaying the other menu items. Ugh.)

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  • Error handling in Rails Controller for adding embedded Mongoid documents to Model

    - by Dragonfly
    I have a Item model that has embedded documents. Currently, the following comments_controller code will add a comment to the item successfully. However, if pushing the comment document onto the comments array on item fails, I will not know this. #this does work, but i do not know if the push fails def create comment = Comment.new(:text => params[:text]) @item.comments << comment render :text => comment end I would like to have something like this, but @item.comments << comment does not return true or false: #this does not work def create comment = Comment.new(:text => params[:text]) if @item.comments << comment render :text => comment else render :text => 'oh no' end end Nor does it throw an exception when the document push fails: #this does not work def create begin comment = Comment.new(:text => params[:text]) @item.comments << comment render :text => comment rescue Exception => e render :text => 'oh no' end end Thanks!

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  • picturebox image randomisation C#

    - by cheesebunz
    Hi everyone, i am working on a puzzle slider program and trying to randomize images inside of pictureboxes. I did some research on the internet can't find any examples i could work on. These are my code: Random r = new Random(); PictureBox[] picBox = new PictureBox[9]; picBox[0] = new PictureBox(); picBox[1] = new PictureBox(); picBox[2] = new PictureBox(); picBox[3] = new PictureBox(); picBox[4] = new PictureBox(); picBox[5] = new PictureBox(); picBox[6] = new PictureBox(); picBox[7] = new PictureBox(); picBox[8] = new PictureBox(); i have bitmap array too: Bitmap[] pictures = new Bitmap[9]; pictures[0] = new Bitmap(@"1.1Bright.jpg"); pictures[1] = new Bitmap(@"1.2Bright.jpg"); pictures[2] = new Bitmap(@"1.3Bright.jpg"); pictures[3] = new Bitmap(@"2.1Bright.jpg"); pictures[4] = new Bitmap(@"2.2Bright.jpg"); pictures[5] = new Bitmap(@"2.3Bright.jpg"); pictures[6] = new Bitmap(@"3.1Bright.jpg"); pictures[7] = new Bitmap(@"3.2Bright.jpg"); pictures[8] = new Bitmap(@"3.3Dark.jpg"); i tried a few ways but i don't know how to set random pictures[] into the picBox[]: for(int i=0; i<=8;i++) { picBox[i].Image= pictures[r.Next(0,9)]; } the problem here is that some pictureboxes e.g picBox[1] and picBox[6] are repeated pictures. How do i make them non repeats? Examples are greatly appreciated thanks.

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