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• Defend PHP; convince me it isn't horrible

  - by Jason L

  I made a tongue-in-cheek comment in another question thread calling PHP a terrible language and it got down-voted like crazy. Apparently there are lots of people here who love PHP. So I'm genuinely curious. What am I missing? What makes PHP a good language? Here are my reasons for disliking it: PHP has inconsistent naming of built-in and library functions. Predictable naming patterns are important in any design. PHP has inconsistent parameter ordering of built-in functions, eg array_map vs. array_filter which is annoying in the simple cases and raises all sorts of unexpected behaviour or worse. The PHP developers constantly deprecate built-in functions and lower-level functionality. A good example is when they deprecated pass-by-reference for functions. This created a nightmare for anyone doing, say, function callbacks. A lack of consideration in redesign. The above deprecation eliminated the ability to, in many cases, provide default keyword values for functions. They fixed this in PHP 5, but they deprecated the pass-by-reference in PHP 4! Poor execution of name spaces (formerly no name spaces at all). Now that name spaces exist, what do we use as the dereference character? Backslash! The character used universally for escaping, even in PHP! Overly-broad implicit type conversion leads to bugs. I have no problem with implicit conversions of, say, float to integer or back again. But PHP (last I checked) will happily attempt to magically convert an array to an integer. Poor recursion performance. Recursion is a fundamentally important tool for writing in any language; it can make complex algorithms far simpler. Poor support is inexcusable. Functions are case insensitive. I have no idea what they were thinking on this one. A programming language is a way to specify behavior to both a computer and a reader of the code without ambiguity. Case insensitivity introduces much ambiguity. PHP encourages (practically requires) a coupling of processing with presentation. Yes, you can write PHP that doesn't do so, but it's actually easier to write code in the incorrect (from a sound design perspective) manner. PHP performance is abysmal without caching. Does anyone sell a commercial caching product for PHP? Oh, look, the designers of PHP do. Worst of all, PHP convinces people that designing web applications is easy. And it does indeed make much of the effort involved much easier. But the fact is, designing a web application that is both secure and efficient is a very difficult task. By convincing so many to take up programming, PHP has taught an entire subgroup of programmers bad habits and bad design. It's given them access to capabilities that they lack the understanding to use safely. This has led to PHP's reputation as being insecure. (However, I will readily admit that PHP is no more or less secure than any other web programming language.) What is it that I'm missing about PHP? I'm seeing an organically-grown, poorly-managed mess of a language that's spawning poor programmers. So convince me otherwise!

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• Not sure why I'm getting a NullPointerException when creating a Swing component

  - by Alex

  The error occurs when creating the Box object. public void drawBoard(Board board){ for(int row = 0; row < 8; row++){ for(int col = 0; col < 8; col++){ Box box = new Box(board.getSquare(col, row).getColour(), col, row); squarePanel[col][row].add(box); } } Board is given from the Game constructor here (another class): public Game() throws Throwable{ View graphics = new View(); board = new Board(); board.setDefault(); graphics.drawBoard(board); } The Board constructor looks like this: public Board(){ grid = new Square[COLUMNS][ROWS]; for(int row = 0; row < 8; row++){ for(int col = 0; col < 8; col++){ grid[col][row] = new Square(this); } } for(int row = 0; row < 8; row++){ for(int col = 0; col < 4; col++){ int odd = 2*col + 1; int even = 2*col; getSquare(odd, row).setColour(Color.BLACK); getSquare(even, row).setColour(Color.WHITE); } } } And finally the Box class: class Box extends JComponent{ Color boxColour; int col, row; public Box(Color boxColour, int col, int row){ this.boxColour = boxColour; this.col = col; this.row = row; repaint(); } public void paint(Graphics drawBox){ drawBox.setColor(boxColour); drawBox.drawRect(50*col, 50*row, 50, 50); drawBox.fillRect(50*col, 50*row, 50, 50); } } So while looping through the array, it uses the two integers as coordinates to create the Box. The coordinates are referenced and then repaint() is run. The box also gets the colour, using the two integers, from the Square in the Board class. Since the colour is already set, before the drawBoard(board) method is run, that shouldn't be a problem, right? Exception in thread "main" java.lang.NullPointerException at View.drawBoard(View.java:38) at Game.<init>(Game.java:21) at Game.main(Game.java:14) The relevant part of Square import java.awt.Color; public class Square { private Piece piece; private Board board; private Color squareColour; public Square(Board board){ this.board = board; } public void setColour(Color squareColour){ this.squareColour = squareColour; } public Color getColour(){ return squareColour; }

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• Visual Studio reports that not all code path return a value, even though they do

  - by chris12892

  I have an API in NETMF C# that I am writing that includes a function to send an HTTP request. For those who are familiar with NETMF, this is a heavily modified version of the "webClient" example, which a simple application that demonstrates how to submit an HTTP request, and recive a response. In the sample, it simply prints the response and returns void,. In my version, however, I need it to return the HTTP response. For some reason, Visual Studio reports that not all code paths return a value, even though, as far as I can tell, they do. Here is my code... /// <summary> /// This is a modified webClient /// </summary> /// <param name="url"></param> private string httpRequest(string url) { // Create an HTTP Web request. HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest; // Set request.KeepAlive to use a persistent connection. request.KeepAlive = true; // Get a response from the server. WebResponse resp = request.GetResponse(); // Get the network response stream to read the page data. if (resp != null) { Stream respStream = resp.GetResponseStream(); string page = ""; byte[] byteData = new byte[4096]; char[] charData = new char[4096]; int bytesRead = 0; Decoder UTF8decoder = System.Text.Encoding.UTF8.GetDecoder(); int totalBytes = 0; // allow 5 seconds for reading the stream respStream.ReadTimeout = 5000; // If we know the content length, read exactly that amount of // data; otherwise, read until there is nothing left to read. if (resp.ContentLength != -1) { for (int dataRem = (int)resp.ContentLength; dataRem > 0; ) { Thread.Sleep(500); bytesRead = respStream.Read(byteData, 0, byteData.Length); if (bytesRead == 0) throw new Exception("Data laes than expected"); dataRem -= bytesRead; // Convert from bytes to chars, and add to the page // string. int byteUsed, charUsed; bool completed = false; totalBytes += bytesRead; UTF8decoder.Convert(byteData, 0, bytesRead, charData, 0, bytesRead, true, out byteUsed, out charUsed, out completed); page = page + new String(charData, 0, charUsed); } page = new String(System.Text.Encoding.UTF8.GetChars(byteData)); } else throw new Exception("No content-Length reported"); // Close the response stream. For Keep-Alive streams, the // stream will remain open and will be pushed into the unused // stream list. resp.Close(); return page; } } Any ideas? Thanks...

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• Why do I get an extra newline in the middle of a UTF-8 character with XML::Parser?

  - by René Nyffenegger

  I encountered a problem dealing with UTF-8, XML and Perl. The following is the smallest piece of code and data in order to reproduce the problem. Here's an XML file that needs to be parsed: <?xml version="1.0" encoding="utf-8"?> <test> <words>???????????? ??????? ????????? ???? ???????????? ??????</words> <words>???????????? ??????? ????????? ???? ???????????? ??????</words> <words>???????????? ??????? ????????? ???? ???????????? ??????</words> [<words> .... </words> 148 times repeated] <words>???????????? ??????? ????????? ???? ???????????? ??????</words> <words>???????????? ??????? ????????? ???? ???????????? ??????</words> </test> The parsing is done with this perl script: use warnings; use strict; use XML::Parser; use Data::Dump; my $in_words = 0; my $xml_parser=new XML::Parser(Style=>'Stream'); $xml_parser->setHandlers ( Start => \&start_element, End => \&end_element, Char => \&character_data, Default => \&default); open OUT, '>out.txt'; binmode (OUT, ":utf8"); open XML, 'xml_test.xml' or die; $xml_parser->parse(*XML); close XML; close OUT; sub start_element { my($parseinst, $element, %attributes) = @_; if ($element eq 'words') { $in_words = 1; } else { $in_words = 0; } } sub end_element { my($parseinst, $element, %attributes) = @_; if ($element eq 'words') { $in_words = 0; } } sub default { # nothing to see here; } sub character_data { my($parseinst, $data) = @_; if ($in_words) { if ($in_words) { print OUT "$data\n"; } } } When the script is run, it produces the out.txt file. The problem is in this file on line 147. The 22th character (which in utf-8 consists of \xd6 \xb8) is split between the d6 and b8 with a new line. This should not happen. Now, I am interested if someone else has this problem or can reproduce it. And why I am getting this problem. I am running this script on Windows: C:\temp>perl -v This is perl, v5.10.0 built for MSWin32-x86-multi-thread (with 5 registered patches, see perl -V for more detail) Copyright 1987-2007, Larry Wall Binary build 1003 [285500] provided by ActiveState http://www.ActiveState.com Built May 13 2008 16:52:49

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• Android : Providing auto autosuggestion in android places Api?

  - by user1787493

  I am very new to android Google maps i write the following program for displaying the auto sugesstion in the android when i am type the text in the Autocomplete text box it is going the input to the url but the out put is not showing in the program .please see once and let me know where i am doing the mistake. package com.example.exampleplaces; import java.util.ArrayList; import org.json.JSONArray; import org.json.JSONObject; import org.json.JSONTokener; import android.app.Activity; import android.os.AsyncTask; import android.os.Bundle; import android.provider.SyncStateContract.Constants; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.View; import android.widget.AutoCompleteTextView; import android.widget.ProgressBar; public class Place extends Activity { private AutoCompleteTextView mAtv_DestinationLocaiton; public ArrayList<String> autocompletePlaceList; public boolean DestiClick2; private ProgressBar destinationProgBar; private static final String GOOGLE_PLACE_API_KEY = ""; private static final String GOOGLE_PLACE_AUTOCOMPLETE_URL = "https://maps.googleapis.com/maps/api/place/autocomplete/json?"; //https://maps.googleapis.com/maps/api/place/autocomplete/output?parameters @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); autocompletePlaceList = new ArrayList<String>(); destinationProgBar=(ProgressBar)findViewById(R.id.progressBar1); mAtv_DestinationLocaiton = (AutoCompleteTextView) findViewById(R.id.et_govia_destination_location); mAtv_DestinationLocaiton.addTextChangedListener(new TextWatcher() { public void onTextChanged(CharSequence s, int start, int before, int count) { Log.i("Count", "" + count); if (!mAtv_DestinationLocaiton.isPerformingCompletion()) { autocompletePlaceList.clear(); DestiClick2 = false; new loadDestinationDropList().execute(s.toString()); } } public void beforeTextChanged(CharSequence s, int start, int count, int after) { // TODO Auto-generated method stub } public void afterTextChanged(Editable s) { // TODO Auto-generated method stub } }); } private class loadDestinationDropList extends AsyncTask<String, Void, ArrayList<String>> { @Override protected void onPreExecute() { // Showing progress dialog before sending http request destinationProgBar.setVisibility(View.INVISIBLE); } protected ArrayList<String> doInBackground(String... unused) { try { Thread.sleep(3000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } autocompletePlaceList = getAutocompletePlaces(mAtv_DestinationLocaiton.getText().toString()); return autocompletePlaceList; } public ArrayList<String> getAutocompletePlaces(String placeName) { String response2 = ""; ArrayList<String> autocompletPlaceList = new ArrayList<String>(); String url = GOOGLE_PLACE_AUTOCOMPLETE_URL + "input=" + placeName + "&sensor=false&key=" + GOOGLE_PLACE_API_KEY; Log.e("MyAutocompleteURL", "" + url); try { //response2 = httpCall.connectToGoogleServer(url); JSONObject jsonObj = (JSONObject) new JSONTokener(response2.trim() .toString()).nextValue(); JSONArray results = (JSONArray) jsonObj.getJSONArray("predictions"); for (int i = 0; i < results.length(); i++) { Log.e("RESULTS", "" + results.getJSONObject(i).getString("description")); autocompletPlaceList.add(results.getJSONObject(i).getString( "description")); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return autocompletPlaceList; } } }

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• Mbean registered but not found in mbean Server

  - by Prisco

  I have a problem about the mbeans. I have created a simple mbean and I have registered it on the default mBeanServer that is run (Via eclipse or java -jar mbean.jar) and in the same process if I try to fouund the mbean registered with a simple query: for (ObjectInstance instance : mbs.queryMBeans(ObjectNameMbean, null)) { System.out.println(instance.toString()); } the query retuerns my mbean, but if I start another process and try to search this mbean registered the mbeas is not found! why? The approch is : (Process that is running) public static void main(String[] args) throws Exception { MBeanServer mbeanServer =ManagementFactory.getPlatformMBeanServer(); ObjectName objectName = new ObjectName(ObjectNameMbean); Simple simple = new Simple (1, 0); mbeanServer.registerMBean(simple, objectName); while (true) { wait (Is this necessary?) } } So this is the first process that is running (that has the only pourpose to registry the mbean, because there is another process that want to read these informations. So I start another process to search this mbean but nothing. I 'm not using jboss but the local Java virtual Machine but my scope is to deploy this simple application in one ejb (autostart) and another ejb will read all informations. All suggestions are really apprecciated. This example should be more useful : Object Hello: public class Hello implements HelloMBean { public void sayHello() { System.out.println("hello, world"); } public int add(int x, int y) { return x + y; } public String getName() { return this.name; } public int getCacheSize() { return this.cacheSize; } public synchronized void setCacheSize(int size) { this.cacheSize = size; System.out.println("Cache size now " + this.cacheSize); } private final String name = "Reginald"; private int cacheSize = DEFAULT_CACHE_SIZE; private static final int DEFAULT_CACHE_SIZE = 200; } Interface HelloBean (implemented by Hello) public interface HelloMBean { public void sayHello(); public int add(int x, int y); public String getName(); public int getCacheSize(); public void setCacheSize(int size); } Simple Main import java.lang.management.ManagementFactory; import java.util.logging.Logger; import javax.management.MBeanServer; import javax.management.ObjectName; public class Main { static Logger aLog = Logger.getLogger("MBeanTest"); public static void main(String[] args) { try{ MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); ObjectName name = new ObjectName("ApplicationDomain:type=Hello"); Hello mbean = new Hello(); mbs.registerMBean(mbean, name); // System.out.println(mbs.getAttribute(name, "Name")); aLog.info("Waiting forever..."); Thread.sleep(Long.MAX_VALUE); } catch(Exception x){ x.printStackTrace(); aLog.info("exception"); } } } So now I have exported this project as jar file and run it as "java -jar helloBean.jar" and by eclipse I have modified the main class to read informations of this read (Example "Name" attribute) by using the same objectname used to registry it . Main to read : public static void main(String[] args) { try{ MBeanServer mbs = ManagementFactory.getPlatformMBeanServer(); ObjectName name = new ObjectName("ApplicationDomain:type=Hello"); System.out.println(mbs.getAttribute(name, "Name")); } catch(Exception x){ x.printStackTrace(); aLog.info("exception"); } } But nothing, the bean is not found.

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• L2S DataContext out of synch: row not found or changed

  - by awrigley

  The Problem I am getting a number of errors that imply that the DataContext, or rather, the way I am using the DataContext is getting out of synch. The error occurs on db.SubmitChanges() where db is my DataContext instance. The error is: Row not found or changed. The problem only occurs intermitently, for example, adding a row then deleting it. If I stop the dev server and restart, the added row is there and I can delete it no problem. Ie, it seems that the problem is related to the DataContext losing track of the rows that have been added. IMPORTANT: Before anyone votes to close this thread, on the basis of it being a duplicate, I have checked the sql server profiler and there is no "Where 0 = 1" in the SQL. I have also recreated the dbml file, so am satisfied that the database schema is in synch with the schema represented by the dbml file. Ie, no cases of mismatched nullable/not nullable columns, etc. My Diagnosis (for what it is worth): It seems to be a problem related to how I am using the DataContext. I am new to MVC, Repositories and Services patterns, so suspect that I have wired things up wrong. The Setup Simple eLearning app in its early stages. Pupils need to be able to add and delete courses (Courses table) to their UserCourses. To do this, I have a service that gets a specific DataContext instance Dependency Injected into its constructor. Service Class Constructor: public class SqlPupilBlockService : IPupilBlockService { DataContext db; public SqlPupilBlockService(DataContext db) { this.db = db; CoursesRepository = new SqlRepository<Course>(db); UserCoursesRepository = new SqlRepository<UserCourse>(db); } // Etc, etc } The CoursesRepository and UserCoursesRepository are both private properties of the service class that are of Type IRepository (just a simple generic repository interface). Sql Respoitory Code: public class SqlRepository<T> : IRepository<T> where T : class { DataContext db; public SqlRepository(DataContext db) { this.db = db; } #region IRepository<T> Members public IQueryable<T> Query { get { return db.GetTable<T>(); } } public List<T> FetchAll() { return Query.ToList(); } public void Add(T entity) { db.GetTable<T>().InsertOnSubmit(entity); } public void Delete(T entity) { db.GetTable<T>().DeleteOnSubmit(entity); } public void Save() { db.SubmitChanges(); } #endregion } The two methods for adding and deleting UserCourses are: Service Methods for Adding and Deleting UserCourses: public void AddUserCourse(int courseId) { UserCourse uc = new UserCourse(); uc.IdCourse = courseId; uc.IdUser = UserId; uc.DateCreated = DateTime.Now; uc.DateAmended = DateTime.Now; uc.Role = "Pupil"; uc.CourseNotes = string.Empty; uc.ActiveStepIndex = 0; UserCoursesRepository.Add(uc); UserCoursesRepository.Save(); } public void DeleteUserCourse(int courseId) { var uc = (UserCoursesRepository.Query.Where(x => x.IdUser == UserId && x.IdCourse == courseId)).Single(); UserCoursesRepository.Delete(uc); UserCoursesRepository.Save(); } Ajax I am using Ajax via Ajax.BeginForm I don't think that is relevant. ASP.NET MVC 3 I am using mvc3, but don't think that is relevant: the errors are related to model code.

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• Launching an Activity from a Service

  - by nldev

  When I am trying to launch a call activity from a Service, I get a NullPointerException. Here is my code: Intent callIntent = new Intent(Intent.ACTION_CALL); callIntent.setData(Uri.parse("tel:" + number)); callIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(callIntent); I get the exception on the startActivity line. I tried to use getApplication.startActivity and getApplicationContext.startActivity but no luck. Any ideas? edit : Maybe some usefull info: I am trying to create a service that will run on the background and scan sensor data, when a certain signal is given i would like to maken an automated call to a number. edit : full adb error code: 03-31 09:04:10.214: ERROR/AndroidRuntime(1896): Uncaught handler: thread main exiting due to uncaught exception 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): java.lang.RuntimeException: Unable to instantiate service dfz.epilepsiedetector.services.DetectionService: java.lang.NullPointerException 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2668) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.app.ActivityThread.access$3100(ActivityThread.java:116) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1846) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.os.Handler.dispatchMessage(Handler.java:99) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.os.Looper.loop(Looper.java:123) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.app.ActivityThread.main(ActivityThread.java:4203) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at java.lang.reflect.Method.invokeNative(Native Method) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at java.lang.reflect.Method.invoke(Method.java:521) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at dalvik.system.NativeStart.main(Native Method) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): Caused by: java.lang.NullPointerException 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.content.ContextWrapper.getPackageName(ContextWrapper.java:120) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.content.ComponentName.<init>(ComponentName.java:75) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.content.Intent.<init>(Intent.java:2302) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at dfz.epilepsiedetector.services.DetectionService.<init>(DetectionService.java:35) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at java.lang.Class.newInstanceImpl(Native Method) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at java.lang.Class.newInstance(Class.java:1472) 03-31 09:04:10.226: ERROR/AndroidRuntime(1896): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2665) edit Trimmed class code: `public class DetectionService extends IntentService implements SensorEventListener { private SensorManager mSensorManager; private Sensor mAccelerometer; private boolean hasSeizure = false; private final int POLLS_PER_SECOND = 10; public DetectionService() { super("EpilepsionDetectionService"); //mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); // mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); /*Intent callIntent = new Intent(Intent.ACTION_CALL); callIntent.setData(Uri.parse("tel:" + "+31648363944")); callIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);*/ Intent callIntent = new Intent(DetectionService.this, InformationActivity.class); callIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); getApplication().startActivity(callIntent); //((Activity) getContext()).startActivity(callIntent); }`

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• TCP client in C and server in Java

  - by faldren

  I would like to communicate with 2 applications : a client in C which send a message to the server in TCP and the server in Java which receive it and send an acknowledgement. Here is the client (the code is a thread) : static void *tcp_client(void *p_data) { if (p_data != NULL) { char const *message = p_data; int sockfd, n; struct sockaddr_in serv_addr; struct hostent *server; char buffer[256]; sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd < 0) { error("ERROR opening socket"); } server = gethostbyname(ALARM_PC_IP); if (server == NULL) { fprintf(stderr,"ERROR, no such host\n"); exit(0); } bzero((char *) &serv_addr, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr, server->h_length); serv_addr.sin_port = htons(TCP_PORT); if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0) { error("ERROR connecting"); } n = write(sockfd,message,strlen(message)); if (n < 0) { error("ERROR writing to socket"); } bzero(buffer,256); n = read(sockfd,buffer,255); if (n < 0) { error("ERROR reading from socket"); } printf("Message from the server : %s\n",buffer); close(sockfd); } return 0; } And the java server : try { int port = 9015; ServerSocket server=new ServerSocket(port); System.out.println("Server binded at "+((server.getInetAddress()).getLocalHost()).getHostAddress()+":"+port); System.out.println("Run the Client"); while (true) { Socket socket=server.accept(); BufferedReader in= new BufferedReader(new InputStreamReader(socket.getInputStream())); System.out.println(in.readLine()); PrintStream out=new PrintStream(socket.getOutputStream()); out.print("Welcome by server\n"); out.flush(); out.close(); in.close(); System.out.println("finished"); } } catch(Exception err) { System.err.println("* err"+err); } With n = read(sockfd,buffer,255); the client is waiting a response and for the server, the message is never ended so it doesn't send a response with PrintStream. If I remove these lines : bzero(buffer,256); n = read(sockfd,buffer,255); if (n < 0) { error("ERROR reading from socket"); } printf("Message from the server : %s\n",buffer); The server knows that the message is finished but the client can't receive the response. How solve that ? Thank you

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• Perl kill(0, $pid) in Windows always returning 1

  - by banshee_walk_sly

  I'm trying to make a Perl script that will run a set of other programs in Windows. I need to be able to capture the stdout, stderr, and exit code of the process, and I need to be able to see if a process exceeds it's allotted execution time. Right now, the pertinent part of my code looks like: ... $pid = open3($wtr, $stdout, $stderr, $command); if($time < 0){ waitpid($pid, 0); $return = $? >> 8; $death_sig = $? & 127; $core_dump = $? & 128; } else{ # Do timeout stuff, currently not working as planned print "pid: $pid\n"; my $elapsed = 0; #THIS LOOP ONLY TERMINATES WHEN $time > $elapsed ...? while(kill 0, $pid and $time > $elapsed){ Time::HiRes::usleep(1000); # sleep for milliseconds $elapsed += 1; $return = $? >> 8; $death_sig = $? & 127; $core_dump = $? & 128; } if($elapsed >= $time){ $status = "FAIL"; print $log "TIME LIMIT EXCEEDED\n"; } } #these lines are needed to grab the stdout and stderr in arrays so # I may reuse them in multiple logs if(fileno $stdout){ @stdout = <$stdout>; } if(fileno $stderr){ @stderr = <$stderr>; } ... Everything is working correctly if $time = -1 (no timeout is needed), but the system thinks that kill 0, $pid is always 1. This makes my loop run for the entirety of the time allowed. Some extra details just for clarity: This is being run on Windows. I know my process does terminate because I have get all the expected output. Perl version: This is perl, v5.10.1 built for MSWin32-x86-multi-thread (with 2 registered patches, see perl -V for more detail) Copyright 1987-2009, Larry Wall Binary build 1007 [291969] provided by ActiveState http://www.ActiveState.com Built Jan 26 2010 23:15:11 I appreciate your help :D For that future person who may have a similar issue I got the code to work, here is the modified code sections: $pid = open3($wtr, $stdout, $stderr, $command); close($wtr); if($time < 0){ waitpid($pid, 0); } else{ print "pid: $pid\n"; my $elapsed = 0; while(waitpid($pid, WNOHANG) <= 0 and $time > $elapsed){ Time::HiRes::usleep(1000); # sleep for milliseconds $elapsed += 1; } if($elapsed >= $time){ $status = "FAIL"; print $log "TIME LIMIT EXCEEDED\n"; } } $return = $? >> 8; $death_sig = $? & 127; $core_dump = $? & 128; if(fileno $stdout){ @stdout = <$stdout>; } if(fileno $stderr){ @stderr = <$stderr>; } close($stdout); close($stderr);

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• setting something disposed or invisible java

  - by OVERTONE

  this might be simple enough as just inserting the right method but i cant seem to get it right. i have a simple program with two buttons. each one changes the picture above them. but anytime i click the buttons i get some odd awt event queue error. i think its because im trying to add something to a frame after its already been made. package icnon; import javax.imageio.*; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class FrameIconExample extends JFrame implements ActionListener { JLabel j; JPanel p, l, k; JButton picOne, picTwo; Container cPane; public FrameIconExample() { JButton picOne = new JButton("picOne"); JButton picTwo = new JButton("picTwo"); picOne.setName("picOne"); picTwo.setName("picTwo"); picOne.addActionListener(this); picTwo.addActionListener(this); JPanel p = new JPanel(new GridLayout(2, 1)); JPanel l = new JPanel(new FlowLayout()); JPanel k = new JPanel(new FlowLayout()); cPane = getContentPane(); j = new JLabel(new ImageIcon("../meet/src/images/beautiful-closeup-portrait-photography.jpg")); l.add(j); k.add(picOne); k.add(picTwo); p.add(l); p.add(k); add(p); } public static void main(String[] args) { FrameIconExample frame = new FrameIconExample(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(new Dimension(300, 800)); frame.setTitle("Frame Icon Example"); // Display the form frame.setVisible(true); } @Override public void actionPerformed(ActionEvent e) { JButton temp = (JButton) e.getSource(); String src = "../meet/src/images/Majken Kruse portrait - john.jpg"; //System.out.println(src + " " + temp.getName()); if(temp.getName().equalsIgnoreCase("picOne")) { src = "../meet/src/images/beautiful-closeup-portrait-photography.jpg"; System.out.println(src + " " + temp.getName()); Icon img; j = new JLabel(new ImageIcon(src)); l.add(j); System.out.println("1"); } if(temp.getName().equalsIgnoreCase("picTwo")) { src = "../icontest/images/Majken Kruse portrait - john.jpg"; System.out.println(src + " " + temp.getName()); Icon img; j = new JLabel(new ImageIcon(src)); l.add(j); System.out.println("2"); } } } its all just the one program so if you copy paste it into an editor you can see the stack trace. but the source of the image files wont be there. does anyone know how id do it? or where im goin wrong? stack trace: ../meet/src/images/beautiful-closeup-portrait-photography.jpg picOne Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at icnon.FrameIconExample.actionPerformed(FrameIconExample.java:68) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)

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• C# performance varying due to memory

  - by user1107474

  Hope this is a valid post here, its a combination of C# issues and hardware. I am benchmarking our server because we have found problems with the performance of our quant library (written in C#). I have simulated the same performance issues with some simple C# code- performing very heavy memory-usage. The code below is in a function which is spawned from a threadpool, up to a maximum of 32 threads (because our server has 4x CPUs x 8 cores each). This is all on .Net 3.5 The problem is that we are getting wildly differing performance. I run the below function 1000 times. The average time taken for the code to run could be, say, 3.5s, but the fastest will only be 1.2s and the slowest will be 7s- for the exact same function! I have graphed the memory usage against the timings and there doesnt appear to be any correlation with the GC kicking in. One thing I did notice is that when running in a single thread the timings are identical and there is no wild deviation. I have also tested CPU-bound algorithms and the timings are identical too. This has made us wonder if the memory bus just cannot cope. I was wondering could this be another .net or C# problem, or is it something related to our hardware? Would this be the same experience if I had used C++, or Java?? We are using 4x Intel x7550 with 32GB ram. Is there any way around this problem in general? Stopwatch watch = new Stopwatch(); watch.Start(); List<byte> list1 = new List<byte>(); List<byte> list2 = new List<byte>(); List<byte> list3 = new List<byte>(); int Size1 = 10000000; int Size2 = 2 * Size1; int Size3 = Size1; for (int i = 0; i < Size1; i++) { list1.Add(57); } for (int i = 0; i < Size2; i = i + 2) { list2.Add(56); } for (int i = 0; i < Size3; i++) { byte temp = list1.ElementAt(i); byte temp2 = list2.ElementAt(i); list3.Add(temp); list2[i] = temp; list1[i] = temp2; } watch.Stop(); (the code is just meant to stress out the memory) I would include the threadpool code, but we used a non-standard threadpool library. EDIT: I have reduced "size1" to 100000, which basically doesn't use much memory and I still get a lot of jitter. This suggests it's not the amount of memory being transferred, but the frequency of memory grabs?

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• Why is there a Null Pointer Exception in this Java Code?

  - by algorithmicCoder

  This code takes in users and movies from two separate files and computes a user score for a movie. When i run the code I get the following error: Exception in thread "main" java.lang.NullPointerException at RecommenderSystem.makeRecommendation(RecommenderSystem.java:75) at RecommenderSystem.main(RecommenderSystem.java:24) I believe the null pointer exception is due to an error in this particular class but I can't spot it....any thoughts? import java.io.*; import java.lang.Math; public class RecommenderSystem { private Movie[] m_movies; private User[] m_users; /** Parse the movies and users files, and then run queries against them. */ public static void main(String[] argv) throws FileNotFoundException, ParseError, RecommendationError { FileReader movies_fr = new FileReader("C:\\workspace\\Recommender\\src\\IMDBTop10.txt"); FileReader users_fr = new FileReader("C:\\workspace\\Recommender\\src\\IMDBTop10-users.txt"); MovieParser mp = new MovieParser(movies_fr); UserParser up = new UserParser(users_fr); Movie[] movies = mp.getMovies(); User[] users = up.getUsers(); RecommenderSystem rs = new RecommenderSystem(movies, users); System.out.println("Alice would rate \"The Shawshank Redemption\" with at least a " + rs.makeRecommendation("The Shawshank Redemption", "asmith")); System.out.println("Carol would rate \"The Dark Knight\" with at least a " + rs.makeRecommendation("The Dark Knight", "cd0")); } /** Instantiate a recommender system. * * @param movies An array of Movie that will be copied into m_movies. * @param users An array of User that will be copied into m_users. */ public RecommenderSystem(Movie[] movies, User[] users) throws RecommendationError { m_movies = movies; m_users = users; } /** Suggest what the user with "username" would rate "movieTitle". * * @param movieTitle The movie for which a recommendation is made. * @param username The user for whom the recommendation is made. */ public double makeRecommendation(String movieTitle, String username) throws RecommendationError { int userNumber; int movieNumber; int j=0; double weightAvNum =0; double weightAvDen=0; for (userNumber = 0; userNumber < m_users.length; ++userNumber) { if (m_users[userNumber].getUsername().equals(username)) { break; } } for (movieNumber = 0; movieNumber < m_movies.length; ++movieNumber) { if (m_movies[movieNumber].getTitle().equals(movieTitle)) { break; } } // Use the weighted average algorithm here (don't forget to check for // errors). while(j<m_users.length){ if(j!=userNumber){ weightAvNum = weightAvNum + (m_users[j].getRating(movieNumber)- m_users[j].getAverageRating())*(m_users[userNumber].similarityTo(m_users[j])); weightAvDen = weightAvDen + (m_users[userNumber].similarityTo(m_users[j])); } j++; } return (m_users[userNumber].getAverageRating()+ (weightAvNum/weightAvDen)); } } class RecommendationError extends Exception { /** An error for when something goes wrong in the recommendation process. * * @param s A string describing the error. */ public RecommendationError(String s) { super(s); } }

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• error Caused by: java.lang.OutOfMemoryError Load Image

  - by user2493770

  This is my method to load images in background, the first and second load normally. But after these loading, a memory error appears. How can I fix this? public class MainArrayAdapterViewHolder extends ArrayAdapter<EmpresaListaPrincipal> { private final Context context; private ArrayList<EmpresaListaPrincipal> data_array; public DisplayImageOptions options; public ImageLoader imageLoader = ImageLoader.getInstance(); public MainArrayAdapterViewHolder(Context context, ArrayList<EmpresaListaPrincipal> list_of_ids) { super(context, R.layout.main_list_rowlayout, list_of_ids); this.context = context; this.data_array = list_of_ids; //------------- read more here https://github.com/nostra13/Android-Universal-Image-Loader options = new DisplayImageOptions.Builder().showImageForEmptyUri(R.drawable.ic_launcher).showImageOnFail(R.drawable.ic_launcher).resetViewBeforeLoading() .cacheOnDisc().imageScaleType(ImageScaleType.IN_SAMPLE_INT).bitmapConfig(Bitmap.Config.RGB_565).delayBeforeLoading(0).build(); File cacheDir = StorageUtils.getCacheDirectory(context); ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(context).memoryCacheExtraOptions(720, 1280) // default = device screen // dimensions .discCacheExtraOptions(720, 1280, CompressFormat.JPEG, 100).threadPoolSize(3) // default .threadPriority(Thread.NORM_PRIORITY - 1) // default .memoryCacheSize(2 * 1024 * 1024).discCache(new UnlimitedDiscCache(cacheDir)) // default .discCacheSize(50 * 1024 * 1024).discCacheFileCount(100).discCacheFileNameGenerator(new HashCodeFileNameGenerator()) // default .imageDownloader(new BaseImageDownloader(context)) // default .tasksProcessingOrder(QueueProcessingType.FIFO) // default .defaultDisplayImageOptions(options) // default .build(); imageLoader.init(config); } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder viewholder; View v = convertView; //Asociamos el layout de la lista que hemos creado e incrustamos el ViewHolder if(convertView == null){ LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //View rowView = inflater.inflate(R.layout.main_list_rowlayout, parent, false); v = inflater.inflate(R.layout.main_list_rowlayout, parent, false); viewholder = new ViewHolder(); viewholder.textView_main_row_title = (TextView) v.findViewById(R.id.textView_main_row_title); viewholder.imageView_restaurant_icon = (ImageView) v.findViewById(R.id.imageView_restaurant_icon); viewholder.textView_main_row_direccion = (TextView) v.findViewById(R.id.textView_main_row_direccion); v.setTag(viewholder); } ImageLoadingListener mImageLoadingListenr = new ImageLoadingListener() { @Override public void onLoadingStarted(String arg0, View arg1) { // Log.e("* started *", String.valueOf("complete")); } @Override public void onLoadingComplete(String arg0, View arg1, Bitmap arg2) { // Log.e("* complete *", String.valueOf("complete")); } @Override public void onLoadingCancelled(String arg0, View arg1) { } @Override public void onLoadingFailed(String arg0, View arg1, FailReason arg2) { // TODO Auto-generated method stub } }; try { viewholder = (ViewHolder) v.getTag(); viewholder.textView_main_row_title.setText(data_array.get(position).getNOMBRE()); viewholder.textView_main_row_direccion.setText(data_array.get(position).getDIRECCION()); String image = data_array.get(position).getURL(); // ------- image --------- try { if (image.length() > 4) imageLoader.displayImage(image, viewholder.imageView_restaurant_icon, options, mImageLoadingListenr); } catch (Exception ex) { } //textView_main_row_title.setText(name); //textView_main_row_address.setText(address); } catch (Exception e) { // TODO: handle exception } return v; } public class ViewHolder { public TextView textView_main_row_title; public TextView textView_main_row_direccion; //public TextView cargo; public ImageView imageView_restaurant_icon; } }

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• Can i create different observables and different corresponding observers in java?

  - by mithun1538

  Hello everyone, Currently, I have one observable and many observers. What i need is different observables, and depending on the observable, different observers. How do I achieve this? ( For understanding, assume I have different apples - say apple1 apple2... I have observer_1 observing apple1, observer_2 observing apple2, observer_3 observing apple 2 and so on..). I tried creating different objects of the Observable class, but since observers are observing the same class of observable, I don't know how to access a particular instance of the Observable. I have included the following servlet code that contains Observer and Observable classes: public class CustomerServlet extends HttpServlet { public String getNextMessage() { // Create a message sink to wait for a new message from the // message source. return new MessageSink().getNextMessage(source); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ObjectOutputStream dout = new ObjectOutputStream(response.getOutputStream()); String recMSG = getNextMessage(); dout.writeObject(recMSG); dout.flush(); } public void broadcastMessage(String message) { // Send the message to all the HTTP-connected clients by giving the // message to the message source source.sendMessage(message); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { ObjectInputStream din= new ObjectInputStream(request.getInputStream()); String message = (String)din.readObject(); ObjectOutputStream dout = new ObjectOutputStream(response.getOutputStream()); dout.writeObject("1"); dout.flush(); if (message != null) { broadcastMessage(message); } // Set the status code to indicate there will be no response response.setStatus(response.SC_NO_CONTENT); } catch (Exception e) { e.printStackTrace(); } } @Override public String getServletInfo() { return "Short description"; }// </editor-fold> MessageSource source = new MessageSource(); } class MessageSource extends Observable { public void sendMessage(String message) { setChanged(); notifyObservers(message); } } class MessageSource extends Observable { public void sendMessage(String message) { setChanged(); notifyObservers(message); } } class MessageSink implements Observer { String message = null; // set by update() and read by getNextMessage() // Called by the message source when it gets a new message synchronized public void update(Observable o, Object arg) { // Get the new message message = (String)arg; // Wake up our waiting thread notify(); } // Gets the next message sent out from the message source synchronized public String getNextMessage(MessageSource source) { // Tell source we want to be told about new messages source.addObserver(this); // Wait until our update() method receives a message while (message == null) { try { wait(); } catch (Exception e) { System.out.println("Exception has occured! ERR ERR ERR"); } } // Tell source to stop telling us about new messages source.deleteObserver(this); // Now return the message we received // But first set the message instance variable to null // so update() and getNextMessage() can be called again. String messageCopy = message; message = null; return messageCopy; } }

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• Trying to packetize TCP with non-blocking IO is hard! Am I doing something wrong?

  - by Ricket

  Oh how I wish TCP was packet-based like UDP is! But alas, that's not the case, so I'm trying to implement my own packet layer. Here's the chain of events so far (ignoring writing packets) Oh, and my Packets are very simply structured: two unsigned bytes for length, and then byte[length] data. (I can't imagine if they were any more complex, I'd be up to my ears in if statements!) Server is in an infinite loop, accepting connections and adding them to a list of Connections. PacketGatherer (another thread) uses a Selector to figure out which Connection.SocketChannels are ready for reading. It loops over the results and tells each Connection to read(). Each Connection has a partial IncomingPacket and a list of Packets which have been fully read and are waiting to be processed. On read(): Tell the partial IncomingPacket to read more data. (IncomingPacket.readData below) If it's done reading (IncomingPacket.complete()), make a Packet from it and stick the Packet into the list waiting to be processed and then replace it with a new IncomingPacket. There are a couple problems with this. First, only one packet is being read at a time. If the IncomingPacket needs only one more byte, then only one byte is read this pass. This can of course be fixed with a loop but it starts to get sorta complicated and I wonder if there is a better overall way. Second, the logic in IncomingPacket is a little bit crazy, to be able to read the two bytes for the length and then read the actual data. Here is the code, boiled down for quick & easy reading: int readBytes; // number of total bytes read so far byte length1, length2; // each byte in an unsigned short int (see getLength()) public int getLength() { // will be inaccurate if readBytes < 2 return (int)(length1 << 8 | length2); } public void readData(SocketChannel c) { if (readBytes < 2) { // we don't yet know the length of the actual data ByteBuffer lengthBuffer = ByteBuffer.allocate(2 - readBytes); numBytesRead = c.read(lengthBuffer); if(readBytes == 0) { if(numBytesRead >= 1) length1 = lengthBuffer.get(); if(numBytesRead == 2) length2 = lengthBuffer.get(); } else if(readBytes == 1) { if(numBytesRead == 1) length2 = lengthBuffer.get(); } readBytes += numBytesRead; } if(readBytes >= 2) { // then we know we have the entire length variable // lazily-instantiate data buffers based on getLength() // read into data buffers, increment readBytes // (does not read more than the amount of this packet, so it does not // need to handle overflow into the next packet's data) } } public boolean complete() { return (readBytes > 2 && readBytes == getLength()+2); } Basically I need feedback on my code. Please suggest any improvements. Even overhauling my entire system would be okay, if you have suggestions for how better to implement the whole thing. Book recommendations are welcome too; I love books. I just get the feeling that something isn't quite right.

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• C# : Console.Read() does not get the "right" input

  - by Daemonfire3002nd

  Hi there, I have the following code: The actual problem is the "non-quoted" code. I want to get the player amount (max = 4), but when I ask via Console.Read() and I enter any Int from 1 to 4 I get as value: 48 + Console.Read(). They only thing how I can get the "real" input is using Console.ReadLine(), but this does not give me an Integer, no it returns a string, and actually do not know how to convert String (Numbers) to Integers in C#, because I am new, and because I only found ToString() and not ToNumber. using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace eve_calc_tool { class Program { int players; int units; int active_units; int inactive_units; int finished_units; int lastDiceNumber = 0; bool game_state; public static void Main(string[] args) { int count_game = 0; //Console.Title = "Mensch ärger dich nicht"; //Console.WriteLine("\tNeues Spiel wird"); //Console.WriteLine("\t...geladen"); //System.Threading.Thread.Sleep(5000); //Console.Clear(); //Console.WriteLine("Neues Spiel wird gestartet, bitte haben sie etwas Geduld"); //Console.Title = "Spiel " + count_game.ToString(); //Console.Clear(); //string prevText = "Anzahl der Spieler: "; //Console.WriteLine(prevText); string read = Console.ReadLine(); /*Program game = new Program(); game.players = read; game.setPlayers(game.players); if (game.players > 0 && 5 > game.players) { game.firstRound(); }*/ string readagain = read; Console.ReadLine(); } /* bool setPlayers(int amount) { players = amount; if (players > 0) { return true; } else { return false; } } bool createGame() { inactive_units = units = getPlayers() * 4; active_units = 0; finished_units = 0; game_state = true; if (game_state == true) { return true; } else { return false; } } int getPlayers() { return players; } private static readonly Random random = new Random(); private static readonly object syncLock = new object(); public static int RandomNumber(int min, int max) { lock (syncLock) { // synchronize return random.Next(min, max); } } int rollDice() { lastDiceNumber = RandomNumber(1,6); return lastDiceNumber; } int firstRound() { int[] results = new int[getPlayers()]; for (int i = 0; i < getPlayers(); i++) { results[i] = rollDice(); } Array.Sort(results); return results[3]; } */ } }

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• Java deadlock problem....

  - by markovuksanovic

  I am using java sockets for communication. On the client side I have some processing and at this point I send an object to the cient. The code is as follows: while (true) { try { Socket server = new Socket("localhost", 3000); OutputStream os = server.getOutputStream(); InputStream is = server.getInputStream(); CommMessage commMessage = new CommMessageImpl(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(commMessage); os.write(bos.toByteArray()); os.flush(); byte[] buff = new byte[512]; int bytesRead = 0; ByteArrayOutputStream receivedObject = new ByteArrayOutputStream(); while ((bytesRead = is.read(buff)) > -1) { receivedObject.write(buff, 0, bytesRead); System.out.println(receivedObject); } os.close(); Thread.sleep(10000); } catch (IOException e) { } catch (InterruptedException e) { } } Next on the server side I have the following code to read the object and write the response (Which is just an echo message) public void startServer() { Socket client = null; try { server = new ServerSocket(3000); logger.log(Level.INFO, "Waiting for connections."); client = server.accept(); logger.log(Level.INFO, "Accepted a connection from: " + client.getInetAddress()); os = new ObjectOutputStream(client.getOutputStream()); is = new ObjectInputStream(client.getInputStream()); // Read contents of the stream and store it into a byte array. byte[] buff = new byte[512]; int bytesRead = 0; ByteArrayOutputStream receivedObject = new ByteArrayOutputStream(); while ((bytesRead = is.read(buff)) > -1) { receivedObject.write(buff, 0, bytesRead); } // Check if received stream is CommMessage or not contents. CommMessage commMessage = getCommMessage(receivedObject); if (commMessage != null) { commMessage.setSessionState(this.sessionManager.getState().getState()); ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(commMessage); os.write(bos.toByteArray()); System.out.println(commMessage.getCommMessageType()); } else { processData(receivedObject, this.sessionManager); } os.flush(); } catch (IOException e) { } finally { try { is.close(); os.close(); client.close(); server.close(); } catch (IOException e) { } } } The above code works ok if I do not try to read data on the client side (If i exclude the code related to reading). But if I have that code, for some reason, I get some kind of deadlock when accessing input streams. Any ideas what I might have done wrong? Thanks in advance.

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• CookieContainer bug?

  - by Salar

  I'm confused how CookieContainer handles domain, so I create this test. This test shows cookieContainer doesn't return any cookie for "site.com" but according to RFC it should return at least 2 cookies. Isn't it a bug? How make it to work? Here is a discussion about this bug: http://social.msdn.microsoft.com/Forums/en-US/ncl/thread/c4edc965-2dc2-4724-8f08-68815cf1dce6 <%@ Page Language="C#" %> <%@ Import Namespace="System.Net" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> CookieContainer getContainer() { CookieContainer result = new CookieContainer(); Uri uri = new Uri("http://sub.site.com"); string cookieH = @"Test1=val; domain=sub.site.com; path=/"; result.SetCookies(uri, cookieH); cookieH = @"Test2=val; domain=.site.com; path=/"; result.SetCookies(uri, cookieH); cookieH = @"Test3=val; domain=site.com; path=/"; result.SetCookies(uri, cookieH); return result; } void Test() { CookieContainer cookie = getContainer(); lblResult.Text += "<br>Total cookies count: " + cookie.Count + " &nbsp;&nbsp; expected: 3"; Uri uri = new Uri("http://sub.site.com"); CookieCollection coll = cookie.GetCookies(uri); lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2"; uri = new Uri("http://other.site.com"); coll = cookie.GetCookies(uri); lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2"; uri = new Uri("http://site.com"); coll = cookie.GetCookies(uri); lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2"; } protected void Page_Load(object sender, EventArgs e) { Test(); } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>CookieContainer Test Page</title> </head> <body> <form id="frmTest" runat="server"> <asp:Label ID="lblResult" EnableViewState="false" runat="server"></asp:Label> </form> </body> </html>

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• show hidden div tag from another page

  - by neueweblernen

  I'm trying to link to an all-inclusive FAQ page from various pages. The answers are contained in tags, nested within a line item of an unordered list housed by categories. The FAQ page has the following categories: Practical Nurse Exam Online Renewal Practice Hours etc. Under Practical Nurse Exam, there are sub categories, subjects, with questions below in tags that expand onClick. (e.g. Examination Day, Exam Results, etc.) Let's say I'm on a different page called Registration and there's a link to the FAQs for Exam Results. I'm able to link to the page and included the hashtag on the anchor or Exam Results, but it does not expand the subcategory. I've read this thread but it didn't work for me. Please help! The code is below: <script type="text/javascript"> function toggle(Info,pic) { var CState = document.getElementById(Info); CState.style.display = (CState.style.display != 'block') ? 'block' : 'none'; } window.onload = function() { var hash = window.location.hash; // would be "#div1" or something if(hash != "") { var id = hash.substr(1); // get rid of # document.getElementById(id).style.display = 'block'; } } </script> <style type="text/css"> .FAQ { cursor:hand; cursor:pointer; } .FAA { display:none; padding-left:20px; text-indent:-20px; } #FAQlist li { list-style-type: none; } #FAQlist ul { margin-left:0px; } headingOne{ font-family:Arial, Helvetica, sans-serif; color:#66BBFF; font-size:20px; font-weight:bold;} </style> Here's the body (part of it anyway) <headingOne class="FAQ" onClick="toggle('CPNRE', this)">PRACTICAL NURSE EXAM</headingOne> <div class="FAA" id="CPNRE"> <h3><a name="applying">Applying to write the CPNRE</a></h3> <ul id="FAQlist" style="width:450px;"> <li class="FAQ"> <p onclick="toggle('faq1',this)"> <strong>Q: How much does it cost to write the exam?</strong></p> <div class="FAA" id="faq1"> <b>A.</b> In 2013, the cost for the first exam writing is $600.00 which includes the interim license fee. See <a href="https://www.clpnbc.org/What-is-an-LPN/Becoming-an-LPN/Canadian-Practical-Nurse-Registration-Examination/Fees-and-Deadlines.aspx"> fee schedule</a>.</div> <hr /> </li> and here's the body of the other page that contains the link and the same script syntax as the all-inclusive FAQ page. This is just a test, that's not exactly what it will say: <a onclick="toggle('CPNRE', this)" href="file:///S|/Designs/Web stuff/FAQ all inclusive.html#applying"> click here</a>

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• SOAP Service Request C#

  - by user3728352

  I have this code that tries to send a request to a soap server, I'm new to soap so i am not sure if the terms i am using are correct or not please correct me I am wrong. Basically i am accessing a web service method named getUserDomain via soap request Here is the code: public void CallWebService() { var _url = "https://....com/QcXmlWebService/QcXmlWebService.asmx?wsdl"; var _action = "https://....com/QcXmlWebService/QcXmlWebService.asmx?op=GetUserDomains"; XmlDocument soapEnvelopeXml = CreateSoapEnvelope(); HttpWebRequest webRequest = CreateWebRequest(_url, _action); InsertSoapEnvelopeIntoWebRequest(soapEnvelopeXml, webRequest); webRequest.BeginGetResponse(null, null); // begin async call to web request. IAsyncResult asyncResult = webRequest.BeginGetResponse(null, null); // suspend this thread until call is complete. You might want to // do something usefull here like update your UI. asyncResult.AsyncWaitHandle.WaitOne(); // get the response from the completed web request. string soapResult; using (WebResponse webResponse = webRequest.EndGetResponse(asyncResult)) { using (StreamReader rd = new StreamReader(webResponse.GetResponseStream())) { soapResult = rd.ReadToEnd(); } Console.Write(soapResult); } } private HttpWebRequest CreateWebRequest(string url, string action) { HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url); webRequest.Headers.Add("SOAPAction", action); webRequest.ContentType = "text/xml;charset=\"utf-8\""; webRequest.Accept = "text/xml"; webRequest.Method = "POST"; return webRequest; } private XmlDocument CreateSoapEnvelope() { XmlDocument soapEnvelop = new XmlDocument(); string oRequest = ""; oRequest = @"<soap:Envelope xmlns:soap=""http://www.w3.org/2003/05/soap-envelope"" xmlns:qcx=""http://smething.com/QCXML"">"; oRequest = oRequest + "<soap:Header/>"; oRequest = oRequest + "<soap:Body>"; oRequest = oRequest + "<qcx:GetUserDomains>"; oRequest = oRequest + "<qcx:inputXml><![CDATA["; oRequest = oRequest + "<GetUserDomains>"; oRequest = oRequest + "<login>"; oRequest = oRequest + "<domain_name>MBB_BTS</domain_name>"; oRequest = oRequest + "<project_name>WCDMA_BTS_IV</project_name>"; oRequest = oRequest + "<user_name>user</user_name>"; oRequest = oRequest + "<password>pass</password>"; oRequest = oRequest + "</login>"; oRequest = oRequest + "</GetUserDomains>"; oRequest = oRequest + " ]]>"; oRequest = oRequest + "</qcx:inputXml>"; oRequest = oRequest + "</qcx:GetUserDomains>"; oRequest = oRequest + "</soap:Body>"; oRequest = oRequest + "</soap:Envelope>"; soapEnvelop.LoadXml(oRequest); return soapEnvelop; } private void InsertSoapEnvelopeIntoWebRequest(XmlDocument soapEnvelopeXml, HttpWebRequest webRequest) { using (Stream stream = webRequest.GetRequestStream()) { soapEnvelopeXml.Save(stream); } } This code i have seen somewhere in stack overflow before as an answer but i couldn't get it to work... The error im getting is threw exception System.net.webexception. the remote server returned an error :(500) internal server Thanks

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• why is my intent not useful?

  - by user1634887

  This is my first to ask here. I write the code for a Broadcast A start another Broadcast B. But the Broadcast B didn't get the intent's value. Broadcast A:get the sms contain message and start B public void onReceive(Context context, Intent intent) { Object[] pdus=(Object[])intent.getExtras().get("pdus"); for(Object pdu:pdus) { byte[] date=(byte[])pdu; SmsMessage message=SmsMessage.createFromPdu(date); String sender=message.getOriginatingAddress(); String body=message.getMessageBody(); if(sender.equals(AppUtil.herPhone)&&body.regionMatches(0, AppUtil.herSmsText, 0, 18)) { Toast.makeText(context, body, Toast.LENGTH_LONG).show(); String [] bodyArray=body.split(" "); String longitude=bodyArray[1]; String latitude=bodyArray[2]; **Intent uiIntent=new Intent(); Bundle bundle=new Bundle(); bundle.putString("longitude", longitude); bundle.putString("latitude", latitude); uiIntent.putExtras(bundle); uiIntent.setAction("android.janmac.location"); context.sendBroadcast(uiIntent);** abortBroadcast(); } } } Boardcast B: it nest in an Activity. register: button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { AppUtil.SendMessage(MainActivity.this); uiReceiver=new UIReceiver(); IntentFilter filter=new IntentFilter(); filter.addAction("android.janmac.location"); registerReceiver(uiReceiver, filter); } }); extend: private class UIReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Log.v("location","uireceiver????!"); **Bundle bundle=new Bundle(); bundle=intent.getExtras(); herLongitude=Double.valueOf(bundle.getString("longitude")); herLatitude=Double.valueOf(bundle.getString("latitude"));** } } but the bundle couldn't get any values. here is log: 08-30 11:17:40.494: D/AndroidRuntime(2359): Shutting down VM 08-30 11:17:40.514: W/dalvikvm(2359): threadid=1: thread exiting with uncaught exception (group=0x40018560) 08-30 11:17:40.544: E/AndroidRuntime(2359): FATAL EXCEPTION: main 08-30 11:17:40.544: E/AndroidRuntime(2359): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.janmac.location (has extras) } in com.example.locationclient.MainActivity$UIReceiver@40513690 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:722) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Handler.handleCallback(Handler.java:587) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Handler.dispatchMessage(Handler.java:92) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.os.Looper.loop(Looper.java:130) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.ActivityThread.main(ActivityThread.java:3835) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.reflect.Method.invokeNative(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.reflect.Method.invoke(Method.java:507) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622) 08-30 11:17:40.544: E/AndroidRuntime(2359): at dalvik.system.NativeStart.main(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): Caused by: java.lang.NumberFormatException 08-30 11:17:40.544: E/AndroidRuntime(2359): at org.apache.harmony.luni.util.FloatingPointParser.parseDblImpl(Native Method) 08-30 11:17:40.544: E/AndroidRuntime(2359): at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:283) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.Double.parseDouble(Double.java:318) 08-30 11:17:40.544: E/AndroidRuntime(2359): at java.lang.Double.valueOf(Double.java:356) 08-30 11:17:40.544: E/AndroidRuntime(2359): at com.example.locationclient.MainActivity$UIReceiver.onReceive(MainActivity.java:231) 08-30 11:17:40.544: E/AndroidRuntime(2359): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:709) 08-30 11:17:40.544: E/AndroidRuntime(2359): ... 9 more enter code here

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• Setup database for Unit tests with Spring, Hibernate and Spring Transaction Support

  - by Michael Bulla

  I want to test integration of dao-layer with my service-layer in a unit-test. So I need to setup some data in my database (hsql). For this setup I need an own transaction at the begining of my testcase to ensure that all my setup is really commited to database before starting my testcase. So here's what I want to achieve: // NotTranactional public void doTest { // transaction begins setup database // commit transaction service.doStuff() // doStuff is annotated @Transactional(propagation=Propagation.REQUIRED) } Here is my not working code: @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"/asynchUnit.xml"}) @DirtiesContext(classMode=ClassMode.AFTER_EACH_TEST_METHOD) public class ReceiptServiceTest implements ApplicationContextAware { @Autowired(required=true) private UserHome userHome; private ApplicationContext context; @Before @Transactional(propagation=Propagation.REQUIRED) public void init() throws Exception { User user = InitialCreator.createUser(); userHome.persist(user); } @Test public void testDoSomething() { ... } } Leading to this exception: org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here at org.springframework.orm.hibernate3.SpringSessionContext.currentSession(SpringSessionContext.java:63) at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:687) at de.diandan.asynch.modell.GenericHome.getSession(GenericHome.java:40) at de.diandan.asynch.modell.GenericHome.persist(GenericHome.java:53) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196) at $Proxy28.persist(Unknown Source) at de.diandan.asynch.service.ReceiptServiceTest.init(ReceiptServiceTest.java:63) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) I dont know whats the right way to get the transaction around setup database. What I tried: @Before @Transactional(propagation=Propagation.REQUIRED) public void setup() { setup database } - Spring seems not to start transaction in @Before-annotated methods. Beyond that, thats not what I really want, cause there are a lot merhods in my testclass which needs a slightly differnt setup, so I need several of that init-methods. @Transactional(propagation=Propagation.REQUIRED) public void setup() { setup database } public void doTest { init(); service.doStuff() // doStuff is annotated @Transactional(propagation=Propagation.REQUIRED) } -- init seems not to get started in transaction What I dont want to do: public void doTest { // doing my own transaction-handling setup database // doing my own transaction-handling service.doStuff() // doStuff is annotated @Transactional(propagation=Propagation.REQUIRED) } -- start mixing springs transaction-handling and my own seems to get pain in the ass. @Transactional(propagation=Propagation.REQUIRED) public void doTest { setup database service.doStuff() } -- I want to test as real as possible situation, so my service should start with a clean session and no transaction opened So whats the right way to setup database for my testcase?

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• if statement to check available elements

  - by nicmare

  Hi there, i allways found an answer here just be reading the threads but now its time for my very first thread because i was unable to find related questions: this is my target code: <li> <span class="panel"> <a href="…" class="image" rel="group"> <img title="…" src="…" alt="…" width="128" height="96" /> </a> <span class="sizes"> <span class="button"> <a href="#" class="size1" rel="…" title="1">9x13</a> </span> <span class="button"> <a href="#" class="size2" rel="…" title="3">10x15</a> </span> <span class="button"> <a href="#" class="size3" rel="…" title="6">20x30</a> </span> </span> </span> <a href="…" class="image" rel="group"> <span class="added"></span> <img title="…" src="…" alt="…" width="128" height="96" class="thumbnail" /> </a> </li> i add two "span" elements through jquery: $('.sizes a').click( function (e) { e.preventDefault(); $(this).after("<span class='checked'></span><span class='remove'></span>"); } ); the maximum amount of those s are 3 times in a wrapped div. so i am trying to do is the following: $(".remove").live('click', function(){ $(this).hide(); $(this).prev().hide(); // hide checked span if ($(this).parent().parent().children().children().each().hasClass('checked')) { $(this).parent().parent().parent().next().children(".added").hide(); } } ); of course my if statement is crap. i try it in my own words: if there are more than one span(class=remove) in span(class=panel) then nothing should happen. but if there is just one span(class=remove) left in span(class=panel) THEN should be hidden how do i achieve this? there is an online demonstration of this: http://bit.ly/972be4 as you can see, every time when i hit a button below an image, the image gets marked by a label. and i want to hide this label (class=added) when no button is selected Thank you very much! best wishes from germany

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• Strange behaviour of CUDA kernel

  - by username_4567

  I'm writing code for calculating prefix sum. Here is my kernel __global__ void prescan(int *indata,int *outdata,int n,long int *sums) { extern __shared__ int temp[]; int tid=threadIdx.x; int offset=1,start_id,end_id; int *global_sum=&temp[n+2]; if(tid==0) { temp[n]=blockDim.x*blockIdx.x; temp[n+1]=blockDim.x*(blockIdx.x+1)-1; start_id=temp[n]; end_id=temp[n+1]; //cuPrintf("Value of start %d and end %d\n",start_id,end_id); } __syncthreads(); start_id=temp[n]; end_id=temp[n+1]; temp[tid]=indata[start_id+tid]; temp[tid+1]=indata[start_id+tid+1]; for(int d=n>>1;d>0;d>>=1) { __syncthreads(); if(tid<d) { int ai=offset*(2*tid+1)-1; int bi=offset*(2*tid+2)-1; temp[bi]+=temp[ai]; } offset*=2; } if(tid==0) { sums[blockIdx.x]=temp[n-1]; temp[n-1]=0; cuPrintf("sums %d\n",sums[blockIdx.x]); } for(int d=1;d<n;d*=2) { offset>>=1; __syncthreads(); if(tid<d) { int ai=offset*(2*tid+1)-1; int bi=offset*(2*tid+2)-1; int t=temp[ai]; temp[ai]=temp[bi]; temp[bi]+=t; } } __syncthreads(); if(tid==0) { outdata[start_id]=0; } __threadfence_block(); __syncthreads(); outdata[start_id+tid]=temp[tid]; outdata[start_id+tid+1]=temp[tid+1]; __syncthreads(); if(tid==0) { temp[0]=0; outdata[start_id]=0; } __threadfence_block(); __syncthreads(); if(blockIdx.x==0 && threadIdx.x==0) { for(int i=1;i<gridDim.x;i++) { sums[i]=sums[i]+sums[i-1]; } } __syncthreads(); __threadfence(); if(blockIdx.x==0 && threadIdx.x==0) { for(int i=0;i<gridDim.x;i++) { cuPrintf("****sums[%d]=%d ",i,sums[i]); } } __syncthreads(); __threadfence(); if(blockIdx.x!=gridDim.x-1) { int tid=(blockIdx.x+1)*blockDim.x+threadIdx.x; if(threadIdx.x==0) cuPrintf("Adding %d \n",sums[blockIdx.x]); outdata[tid]+=sums[blockIdx.x]; } __syncthreads(); } In above kernel, sums array will accumulate prefix sum per block and and then first thread will calculate prefix sum of this sum array. Now if I print this sum array from device side it'll show correct results while in cuPrintf("Adding %d \n",sums[blockIdx.x]); this line it prints that it is taking old value. What could be the reason?

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