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• Linq - how does it work??

  - by clarkeyboy

  Hey, I have just been looking into Linq with ASP.Net. It is very neat indeed. I was just wondering - how do all the classes get populated? I mean in ASP.Net, suppose you have a Linq file called Catalogue, and you then use a For loop to loop through Catalogue.Products and print each Product name. How do the details get stored? Does it just go through the Products table on page load and create another instance of class Product for each row, effectively copying an entire table into an array of class Product? If so, I think I have created a system very much like this, in the sense that there is a SiteContent module with an instance of each Manager class - for example there is UserManager, ProductManager, SettingManager and alike. UserManager contains an instance of the User class for each row in the Users table. They also contain methods such as Create, Update and Remove. These Managers and their "Items" are created on every page load. This just makes it nice and easy to access users, products, settings etc in every page as far as I, the developer, am concerned. Any any subsequent pages I need to create, I just need to reference SiteContent.UserManager to access a list of users, rather than executing a query from within that page (ie this method separates out data access from the workings of the page, in the same way as using code behind separates out the workings of the page from how the page is layed out). However the problem is that this technique seems rather slow. I mean it is effectively creating a database on every page load, taking data from another database. I have taken measures such as preventing, for example, the ProductManager from being created if it is not referenced on page load. Therefore it does not load data into storage when it is not needed. My question is basically whether my technique does the exact same thing as Linq, in the sense of duplicating data from tables into properties of classes.. Thanks in advance for any advice or answers about this. Regards, Richard Clarke

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• error with swiftmailer

  - by user1298805

  I'm trying to add a contact form to my website. In localhost it worked fine, now moving on Tiscali server I'm getting this error: Warning: is_writable() [function.is-writable]: open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/var/www/virtual/mydomain.it/:/usr/share/php/:/var/www/ispcp/gui/tools/filemanager/) in /var/www/virtual/mydomain.it/htdocs/prova-intro/Swift-4.1.6/lib/preferences.php on line 15` Fatal error: Uncaught exception Swift_TransportException' with message 'Expected response code 220 but got code "554", with message "554 santino.mail.tiscali.it ESMTP server not available from your IP "' in /var/www/virtual/mydomain.it/htdocs/prova-intro/Swift-4.1.6/lib/classes/Swift/Transport/AbstractSmtpTransport.php:422 Stack trace: #0 /var/www/virtual/mydomain.it/htdocs/prova-intro/Swift-4.1.6/lib/classes/Swift/Transport/AbstractSmtpTransport.php(315):` Swift_Transport_AbstractSmtpTransport->_assertResponseCode('554 santino.mai...', Array) #1 /var/www/virtual/mydomain.it/htdocs/prova-intro/Swift-4.1.6/lib/classes/Swift/Transport/AbstractSmtpTransport.php(123): Swift_Transport_AbstractSmtpTransport->_readGreeting() #2 /var/www/virtual/mydomain.it/htdocs/prova-intro/Swift-4.1.6/lib/classes/Swift/Mailer.php(79): Swift_Transport_AbstractSmtpTransport->start() #3 /var/www/virtual/mydomain.it/htdocs/prova-intro/mail_SwiftMailer.php(129): Swift_Mailer->send(Object(Swift_Message) in /var/www/virtual/mydomain.it/htdocs/prova-intro/Swift-4.1.6/lib/classes/Swift/Transport/AbstractSmtpTransport.php on line 422` Parameter I'm using: define('HOST_SMTP', 'smtp.mydomain.it'); define('PORT_SMTP', 465); define('SECUTITY_SMTP', ssl); define('EMAIL_SMTP', '[email protected]'); define('PASSWORD_SMTP', 'xxxxxxx'); define('EMAIL_DESTINATARIO', $_POST['destinatario']); define('MAX_DIM_FILE', 1048576); // 1mb

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• Reading binary data from serial port using Dejan TComport Delphi component

  - by johnma

  Apologies for this question but I am a bit of a noob with Delphi. I am using Dejan TComport component to get data from a serial port. A box of equipment connected to the port sends about 100 bytes of binary data to the serial port. What I want to do is extract the bytes as numerical values into an array so that I can perform calculations on them. TComport has a method Read(buffer,Count) which reads DATA from input buffer. function Read(var Buffer; Count: Integer): Integer; The help says the Buffer variable must be large enough to hold Count bytes but does not provide any example of how to use this function. I can see that the Count variable holds the number of bytes received but I can't find a way to access the bytes in Buffer. TComport also has a methord Readstr which reads data from input buffer into a STRING variable. function ReadStr(var Str: String; Count: Integer): Integer; Again the Count variable shows the number of bytes received and I can use Memo1.Text:=str to display some information but obviously Memo1 has problems displaying the control characters. I have tried various ways to try and extract the byte data from Str but so far without success. I am sure it must be easy. Here's hoping.

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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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• php foreach question

  - by user295189

  I have the following code $oldID=-1; $column=0; foreach($pv->rawData as $data){ if ($oldID!= $data->relativeTypeID){ $oldID= $data->relativeTypeID; $column++; $row=1; } echo "Row: ".$row.": Column: ".$column.": ID".$data->relativeTypeID."<br>"; //if exists a description if($data->description){ //insert here in the array $pv->results[$data->relativeTypeID][$row][0]= $data->relation; $pv->results[$data->relativeTypeID][$row][1]= ''; $pv->results[$data->relativeTypeID][$row][2] =''; $pv->results[$data->relativeTypeID][$row][3] = ''; $row++; } } this generates this output Row: 1: Column: 1: ID1 Row: 2: Column: 1: ID1 Row: 1: Column: 2: ID2 Row: 2: Column: 2: ID2 Row: 3: Column: 2: ID2 Row: 4: Column: 2: ID2 Row: 5: Column: 2: ID2 Row: 6: Column: 2: ID2 Row: 7: Column: 2: ID2 Row: 8: Column: 2: ID2 Row: 9: Column: 2: ID2 Row: 10: Column: 2: ID2 Row: 11: Column: 2: ID2 Row: 1: Column: 3: ID3 Row: 1: Column: 4: ID4 Row: 1: Column: 5: ID8 Row: 2: Column: 5: ID8 Row: 3: Column: 5: ID8 Row: 1: Column: 6: ID10 Row: 2: Column: 6: ID10 Row: 3: Column: 6: ID10 Row: 4: Column: 6: ID10 ... .. what I want it to do is to stop at the top 4 columns so I want an output like this Row: 1: Column: 1: ID1 Row: 2: Column: 1: ID1 Row: 1: Column: 2: ID2 Row: 2: Column: 2: ID2 Row: 3: Column: 2: ID2 Row: 4: Column: 2: ID2 Row: 5: Column: 2: ID2 Row: 6: Column: 2: ID2 Row: 7: Column: 2: ID2 Row: 8: Column: 2: ID2 Row: 9: Column: 2: ID2 Row: 10: Column: 2: ID2 Row: 11: Column: 2: ID2 Row: 1: Column: 3: ID3 Row: 1: Column: 4: ID4 as you can see it stopped at column 4. Thanks

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• Do the ‘up to date’ guarantees for values of Java's final fields extend to indirect references?

  - by mattbh

  The Java language spec defines semantics of final fields in section 17.5: The usage model for final fields is a simple one. Set the final fields for an object in that object's constructor. Do not write a reference to the object being constructed in a place where another thread can see it before the object's constructor is finished. If this is followed, then when the object is seen by another thread, that thread will always see the correctly constructed version of that object's final fields. It will also see versions of any object or array referenced by those final fields that are at least as up-to-date as the final fields are. My question is - does the 'up-to-date' guarantee extend to the contents of nested arrays, and nested objects? An example scenario: Thread A constructs a HashMap of ArrayLists, then assigns the HashMap to final field 'myFinal' in an instance of class 'MyClass' Thread B sees a (non-synchronized) reference to the MyClass instance and reads 'myFinal', and accesses and reads the contents of one of the ArrayLists In this scenario, are the members of the ArrayList as seen by Thread B guaranteed to be at least as up to date as they were when MyClass's constructor completed? I'm looking for clarification of the semantics of the Java Memory Model and language spec, rather than alternative solutions like synchronization. My dream answer would be a yes or no, with a reference to the relevant text.

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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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• UTF-8 character encoding battles json_encode()

  - by Dave Jarvis

  Quest I am looking to fetch rows that have accented characters. The encoding for the column (NAME) is latin1_swedish_ci. The Code The following query returns Abord â Plouffe using phpMyAdmin: SELECT C.NAME FROM CITY C WHERE C.REGION_ID=10 AND C.NAME_LOWERCASE LIKE '%abor%' ORDER BY C.NAME LIMIT 30 The following displays expected values (function is called db_fetch_all( $result )): while( $row = mysql_fetch_assoc( $result ) ) { foreach( $row as $value ) { echo $value . " "; $value = utf8_encode( $value ); echo $value . " "; } $r[] = $row; } The displayed values: 5482 5482 Abord â Plouffe Abord â Plouffe The array is then encoded using json_encode: $rows = db_fetch_all( $result ); echo json_encode( $rows ); Problem The web browser receives the following value: {"ID":"5482","NAME":null} Instead of: {"ID":"5482","NAME":"Abord â Plouffe"} (Or the encoded equivalent.) Question The documentation states that json_encode() works on UTF-8. I can see the values being encoded from LATIN1 to UTF-8. After the call to json_encode(), however, the value becomes null. How do I make json_encode() encode the UTF-8 values properly? One possible solution is to use the Zend Framework, but I'd rather not if it can be avoided.

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• String.Empty in strings, need some explanation if possible :)

  - by Pabuc

  Hello all, 2 days ago, there was a question related to string.LastIndexOf(String.Empty) returning the last index of string. So I thought that; a string can always contain string.empty between characters like: "testing" == "t" + String.Empty + "e" + String.Empty +"sting" + String.Empty; After this, I wanted to test if String.IndexOf(String.Empty) was returning 0 because since String.Empty can be between any char in a string, that would be what I expect it to return and I wasn't wrong. string testString = "testing"; int index = testString.LastIndexOf(string.Empty); // index is 6 index = testString.IndexOf(string.Empty); // index is 0 It actually returned 0. I started to think that if I could split a string with String.Empty, I would get at least 2 string and those would be String.Empty and rest of the string since String.IndexOf(String.Empty) returned 0 and String.LastIndexOf(String.Empty) returned length of the string.. Here is what I coded: string emptyString = string.Empty; char[] emptyStringCharArr = emptyString.ToCharArray(); string myDummyString = "abcdefg"; string[] result = myDummyString.Split(emptyStringCharArr); The problem here is, I can't obviously convert String.Empty to char[] and result in an empty string[]. I would really love to see the result of this operation and the reason behind this. So my questions are: Is there any way to split a string with String.Empty? If it is not possible but in an absolute world which it would be possible, would it return an array full of chars like [0] = "t" [1] = "e" [2] = "s" and so on or would it just return the complete string? Which would make more sense and why? Thank you for your time.

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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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• File Format Conversion to TIFF. Some issues???

  - by Nains

  I'm having a proprietary image format SNG( a proprietary format) which is having a countinous array of Image data along with Image meta information in seperate HDR file. Now I need to convert this SNG format to a Standard TIFF 6.0 Format. So I studied the TIFF format i.e. about its Header, Image File Directories( IFD's) and Stripped Image Data. Now I have few concerns about this conversion. Please assist me. SNG Continous Data vs TIFF Stripped Data: Should I convert SNG Data to TIFF as a continous data in one Strip( data load/edit time problem?) OR make logical StripOffsets of the SNG Image data. SNG Data Header uses only necessary Meta Information, thus while converting the SNG to TIFF, some information can’t be retrieved such as NewSubFileType, Software Tag etc. So this raises a concern that after conversion whether any missing directory information such as NewSubFileType, Software Tag etc is necessary and sufficient condition for TIFF File. Encoding of each pixel component of RGB Sample in SNG data: Here each SNG Image Data Strip per Pixel component is encoded as: Out^[i] := round( LineBuffer^[i * 3] * **0.072169** + LineBuffer^[i * 3 + 1] * **0.715160** + LineBuffer^[i * 3+ 2]* **0.212671**); Only way I deduce from it is that each Pixel is represented with 3 RGB component and some coefficient is multiplied with each component to make the SNG Viewer work RGB color information of SNG Image Data. (Developer who earlier work on this left, now i am following the trace :)) Thus while converting this to TIFF, the decoding the same needs to be done. This raises a concern that the how RBG information in TIFF is produced, or better do we need this information?. Please assist...

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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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• 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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• Performance penalty of typecasting and boxing/unboxing types in C# when storing generic values

  - by kitsune

  I have a set-up similar to WPF's DependencyProperty and DependencyObject system. My properties however are generic. A BucketProperty has a static GlobalIndex (defined in BucketPropertyBase) which tracks all BucketProperties. A Bucket can have many BucketProperties of any type. A Bucket saves and gets the actual values of these BucketProperties... now my question is, how to deal with the storage of these values, and what is the penalty of using a typecasting when retrieving them? I currently use an array of BucketEntries that save the property values as simple objects. Is there any better way of saving and returning these values? Beneath is a simpliefied version: public class BucketProperty<T> : BucketPropertyBase { } public class Bucket { private BucketEntry[] _bucketEntries; public void SaveValue<T>(BucketProperty<T> property, T value) { SaveBucketEntry(property.GlobalIndex, value) } public T GetValue<T>(BucketProperty<T> property) { return (T)FindBucketEntry(property.GlobalIndex).Value; } } public class BucketEntry { private object _value; private uint _index; public BucketEntry(uint globalIndex, object value) { ... } }

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• Why my Google endpoint is always the same?

  - by joetsuihk

  always: https://www.google.com/accounts/o8/ud i got wordpress openid ok. so i think is is just discovery phase got some probelms.. <?php $ch = curl_init(); $url = 'https://www.google.com/accounts/o8/id'; $url = $url.'?'; $url = $url.'openid.mode=checkid_setup'; $url = $url.'&openid.ns=http://specs.openid.net/auth/2.0'; $url = $url.'&openid.claimed_id=http://specs.openid.net/auth/2.0/identifier_select'; $url = $url.'&openid.identity=http://specs.openid.net/auth/2.0/identifier_select'; $url = $url.'&openid.return_to='.site_url().'/user/openid/login_callback'; $url = $url.'&openid.realm=http://www.example.com/'; // set url curl_setopt($ch, CURLOPT_URL, $url); //return the transfer as a string curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 2); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_HTTPHEADER,array("Accept: */*")); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); // $output contains the output string $xdr = curl_exec($ch); if (!$xdr) { die(curl_error($ch)); } // close curl resource to free up system resources curl_close($ch); $xml = new SimpleXMLElement($xdr); $url = $xml->XRD->Service->URI; $request = $connection->begin($url); $request always null...

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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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• 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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• What causes exception in string.concat

  - by Budda

  Here are few classes: public class MyItem : ParamOut { public string Code { get { return _quoteCode; } } public InnerItem[] Skus { get { return _skus; } } public PriceSummary Price { get { return _price; } } public override string ToString() { return string.Concat("Code=", Code, "; SKUs=[", Skus != null ? "{" + string.Join("},{", Array.ConvertAll(Skus, item => item.ToString())) + "}" : "", "]" , "; Price={", Price.ToString(), "}", base.ToString() ); } ... } public abstract class ParamOut { public override string ToString() { return null; } public string ErrorMessage { get; set; } } Here is calling functionality: { MyItem item = new MyItem{ ErrorMessage = "Bla-bla-bla" }; string text = item.ToString(); } I am getting NullReference exception inside of 'ToString()' method (each property of item variable is null). Question: Q1. what overload of string.Concat will be called in this case? I have 9 parameters, so I guess one of the following: public static string Concat(params Object[] args) or public static string Concat(params string[] values) But which of them? Q2. Why exception is generated? Shouldn't 'null' be converted into something like 'null' or "" (empty string)? Thanks a lot!

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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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• 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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• 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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• 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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• 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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• 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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