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• Java: How can a constructor return a value?

  - by HH

  $ cat Const.java public class Const { String Const(String hello) { return hello; } public static void main(String[] args) { System.out.println(new Const("Hello!")); } } $ javac Const.java Const.java:7: cannot find symbol symbol : constructor Const(java.lang.String) location: class Const System.out.println(new Const("Hello!")); ^ 1 error

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• Where should I put zoomIn in my MapActivity?

  - by Johny

  I'm writing an Android app, and I'd like to zoomIn as soon as the map has been loaded. I get the following error: java.lang.IllegalArgumentException: width and height must be > 0 This MapActivity - width and height must be > 0 question suggests the problem is the zoomIn() method is in the onCreate() method. But I get same error when I put it in the onResume() method. I've been searching for hours and I can't find anything about it at http://developer.android.com or anywhere else... Also I can't find a way to get the time point the map has been loaded. A "MapLoadedListener" or something like that... EDIT Here is my code: public class AMap extends MapActivity{ private final String LOG_TAG = this.getClass().getSimpleName(); private Context mContext; private Chronometer timer; private TextView tvCountdown; private RelativeLayout rl; private MapView mapView; private MapController mapController; private List<Overlay> mapOverlays; private PlayersOverlay playersOverlay; private Drawable drawable; private Builder endDialog; private ContextThemeWrapper ctw; private Handler mHandler = new Handler(); private Player player = new Player(); private StartTask startTask; private EndTask endTask; private MyDBAdapter mdba; private Cursor playersCursor; private UpdateBroadcastReceiver r; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.map_view); mContext = AMap.this; // set map mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true); mapView.setFocusable(true); // find the relative layout rl = (RelativeLayout) findViewById(R.id.rl); // set the chronometer timer = (Chronometer) findViewById(R.id.tv_timer); timer.setBackgroundColor(Color.DKGRAY); // set the countdown textview tvCountdown = (TextView) findViewById(R.id.tv_countdown); // Open DB connection and get players Cursor mdba = new MyDBAdapter(mContext); mdba.open(); playersCursor = mdba.getGame(); // Get this player's id and location Intent starter = this.getIntent(); player.setId(starter.getIntExtra("id", 0)); player.setLatitude(starter.getDoubleExtra("lat", 0)); player.setLongitude(starter.getDoubleExtra("lon", 0)); // Set this player's location as map's center GeoPoint geoPoint = new GeoPoint((int) (player.getLatitude()*1E6), (int) (player.getLongitude()*1E6)); mapController = mapView.getController(); mapController.setCenter(geoPoint); mapController.setZoom(15); Log.d(LOG_TAG, "My playersCursor has "+playersCursor.getCount()+" rows"); // drawable is needed but not used drawable = this.getResources().getDrawable(R.drawable.ic_launcher); // set PlayersOverlay (locations and statuses) playersOverlay = new PlayersOverlay(player.getId(), playersCursor, drawable, this); mapOverlays = mapView.getOverlays(); mapOverlays.add(playersOverlay); mHandler.postDelayed(mUpdateTimeTask, 100); } private Runnable mUpdateTimeTask = new Runnable() { public void run() { int h = mapView.getLayoutParams().height; int w = mapView.getLayoutParams().width; Log.d(LOG_TAG, "w = "+w+" , h = "+h); mHandler.postAtTime(this, System.currentTimeMillis() + 1000); } }; @Override public void onAttachedToWindow(){ Log.d(LOG_TAG, "Attached to Window"); int h = mapView.getLayoutParams().height; int w = mapView.getLayoutParams().width; Log.d(LOG_TAG, " Attached to window: w = "+w+" , h = "+h); //mapController.zoomInFixing(screenPoint.x, screenPoint.y); } public void onWindowFocusChanged(boolean hasFocus){ Log.d(LOG_TAG, "Focus changed to: "+hasFocus); int h = mapView.getLayoutParams().height; int w = mapView.getLayoutParams().width; Log.d(LOG_TAG, " Window focus changed: w = "+w+" , h = "+h); //mapController.zoomInFixing(screenPoint.x, screenPoint.y); } @Override protected void onStart(){ super.onStart(); // Create and register the broadcast receiver for messages from service IntentFilter filter = new IntentFilter(AppConstants.iGAME_UPDATE); r = new UpdateBroadcastReceiver(); registerReceiver(r, filter); // Create the dialog for end of game ctw = new ContextThemeWrapper(mContext, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen); endDialog = new AlertDialog.Builder(ctw); endDialog.setMessage("End of Game"); endDialog.setCancelable(false); endDialog.setNeutralButton("OK", new OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { Intent highScores = new Intent(AMap.this, HighScores.class); startActivity(highScores); playersCursor.close(); finish(); } }); } @Override protected void onStop() { if(!playersCursor.isClosed()) playersCursor.close(); unregisterReceiver(r); mdba.close(); super.onStop(); } @Override protected boolean isRouteDisplayed() { return false; } // Receives signal from NetworkService that DB has been updated public class UpdateBroadcastReceiver extends BroadcastReceiver { boolean startSignal, update, endSignal; @Override public void onReceive(Context context, Intent intent) { endSignal = intent.getBooleanExtra("endSignal", false); if(endSignal){ Log.d(LOG_TAG, "Game Update BroadcastReceiver received End Signal"); endTask = new EndTask(); endTask.execute(); return; } update = intent.getBooleanExtra("update", false); if(update){ Log.d(LOG_TAG, "Game Update BroadcastReceiver received game update"); playersCursor.requery(); mapView.invalidate(); return; } startSignal = intent.getBooleanExtra("startSignal", false); if(startSignal){ Log.d(LOG_TAG, "Game Update BroadcastReceiver received Start Signal"); startTask = new StartTask(); startTask.execute(); return; } } } class StartTask extends AsyncTask<Void,Integer,Void>{ private final ToneGenerator tg = new ToneGenerator(AudioManager.STREAM_NOTIFICATION, 100); private final long DELAY = 1200; @Override protected Void doInBackground(Void... params) { int i = 3; while(i>=0){ publishProgress(i); try { Thread.sleep(DELAY); } catch (InterruptedException e) { e.printStackTrace(); } i--; } return null; } @Override protected void onProgressUpdate(Integer... progress){ tg.startTone(ToneGenerator.TONE_PROP_PROMPT); tvCountdown.setText(""+progress[0]); } @Override protected void onPostExecute(Void result) { rl.removeView(tvCountdown); timer.setBase(SystemClock.elapsedRealtime()); timer.start(); //enable screen touches playersOverlay.setGameStarted(true); } } class EndTask extends AsyncTask<Void,Void,Void>{ @Override protected void onPreExecute(){ //disable screen touches playersOverlay.setEndOfGame(true); timer.stop(); } @Override protected Void doInBackground(Void... params) { return null; } @Override protected void onPostExecute(Void result) { try{ endDialog.show(); }catch(Exception e){ Toast.makeText(mContext, "End of game", Toast.LENGTH_LONG); Intent highScores = new Intent(AMap.this, HighScores.class); startActivity(highScores); playersCursor.close(); finish(); } mHandler.removeCallbacks(mUpdateTimeTask); } } }

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• How to fix the position of the button in applet

  - by user1609804

  I'm trying to make an applet that has a buttons in the right, where each button is corresponding to a certain pokemon. I already did it, but the buttons isn't fixed.they keep following the mouse. please help. This is my code: import javax.swing.*; import java.awt.image.BufferedImage; import java.io.*; import javax.imageio.ImageIO; import java.applet.*; import java.awt.event.*; import java.awt.*; public class choosePokemon extends Applet implements ActionListener { private int countPokemon; private int[] storePokemon; private int x,y; //this will be the x and y coordinate of the button BufferedImage Picture; public int getCountPokemon(){ //for other class that needs how many pokemon return countPokemon; } public int[] getStoredPokemon(){ //for other class that needs the pokemon return storePokemon; } public void init(){ x=0;y=0; try{ Picture = ImageIO.read(new File("pokeball.png")); } catch( IOException ex ){ } } public void paint( Graphics g ){ pokemon display = new pokemon(); // to access the pokemon attributes in class pokemon ButtonGroup group = new ButtonGroup(); //create a button group for( int a=0;a<16;a++ ){ // for loop in displaying the buttons of every pokemon(one pokemon, one button) display.choose( a ); //calls the method choose in which accepts an integer from 0-15 and saves the attributes of the pokemon corresponding to the integer JButton pokemonButton = new JButton( display.getName() ); // creates the button pokemonButton.setActionCommand( display.getName() ); // isasave sa actioncommand yung name ng kung ano mang pokemon pokemonButton.addActionListener(this); //isasama yung bagong gawang button sa listener para malaman kung na-click yung button pokemonButton.setBounds( x,y,50,23 ); group.add( pokemonButton ); //eto naman yung mag-aadd sa bagong gawang button sa isang group na puro buttons(button ng mga pokemon) y+=23; if( a==7 ){ x+=50; y=0; } add( pokemonButton ); //will add the button to the applet } g.drawImage( Picture, 120, 20, null ); } public void actionPerformed(ActionEvent e) { try{ //displays the picture of the selected pokemon Picture = ImageIO.read(new File( "pokemon/" + e.getActionCommand() + ".png" )); } catch( IOException ex ){ } } public boolean chosen( int PChoice ){ //this will check if the chosen pokemon is already the player's pokemon boolean flag = false; for( int x=0; x<countPokemon && !flag ;x++ ){ if( storePokemon[x]==PChoice ){ flag = true; } } return flag; }

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• Static lock in Python?

  - by roddik

  Hello. I've got the following code: import time import threading class BaseWrapper: #static class lock = threading.Lock() @staticmethod def synchronized_def(): BaseWrapper.lock.acquire() time.sleep(5) BaseWrapper.lock.release() def test(): print time.ctime() if __name__ is '__main__': for i in xrange(10): threading.Thread(target = test).start() I want to have a method synchronized using static lock. However the above code prints the same time ten times, so it isn't really locking. How can I fix it? TIA

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• Rails: three most recent comments for unique users

  - by Dennis Collective

  class User has_many :comments end class Comment belongs_to :user named_scope :recent, :order => 'comments.created_at DESC' named_scope :limit, lambda { |limit| {:limit => limit}} named_scope :by_unique_users end what would I put in the :by_unique_users so that I can do Comment.recent.by_unique_users.limit(3), and only get one comment per user

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• Formtastic with Mongoid embedded_in relations

  - by miah

  Is there any quick way to make a form for embeds_many-embedded_in relation? I have the following: class Team include Mongoid::Document field :name, :type => String embeds_many :players end class Player include Mongoid::Document embedded_in :team, :inverse_of => :players field :name, :type => String end I want to create a form for team with embedded editing for players. Seen https://github.com/bowsersenior/formtastic_with_mongoid_tutorial but "TODO" there.

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• "Cannot find symbol" problem.

  - by joseph

  I'm getting the Cannot find symbol error from my code. Does anyone know what can cause this problem? // Register JDBC driver Class.forName("net.sourceforge.jtds.jdbc.Driver"); method forName(java.Lang.String) Class.forName("net.sourceforge.jtds.jdbc.Driver); ^

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• Can't modify constant item in scalar assignment

  - by joe

  sub new { my $class = shift; my $ldap_obj = Net::LDAP->new( 'test.company.com' ) or die "$@"; my $self = { _ldap = $ldap_obj, _dn ='dc=users,dc=ldap,dc=company,dc=com', _dn_login = 'dc=login,dc=ldap,dc=company,dc=com', _description ='company', }; # Print all the values just for clarification. bless $self, $class; return $self; } what is wrong on this code : i got this error Can't modify constant item in scalar assignment at Core.pm line 12, near "$ldap_obj,"

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• How do I get my dependenices inject using @Configurable in conjunction with readResolve()

  - by bmatthews68

  The framework I am developing for my application relies very heavily on dynamically generated domain objects. I recently started using Spring WebFlow and now need to be able to serialize my domain objects that will be kept in flow scope. I have done a bit of research and figured out that I can use writeReplace() and readResolve(). The only catch is that I need to look-up a factory in the Spring context. I tried to use @Configurable(preConstruction = true) in conjunction with the BeanFactoryAware marker interface. But beanFactory is always null when I try to use it in my createEntity() method. Neither the default constructor nor the setBeanFactory() injector are called. Has anybody tried this or something similar? I have included relevant class below. Thanks in advance, Brian /* * Copyright 2008 Brian Thomas Matthews Limited. * All rights reserved, worldwide. * * This software and all information contained herein is the property of * Brian Thomas Matthews Limited. Any dissemination, disclosure, use, or * reproduction of this material for any reason inconsistent with the * express purpose for which it has been disclosed is strictly forbidden. */ package com.btmatthews.dmf.domain.impl.cglib; import java.io.InvalidObjectException; import java.io.ObjectStreamException; import java.io.Serializable; import java.lang.reflect.InvocationTargetException; import java.util.HashMap; import java.util.Map; import org.apache.commons.beanutils.PropertyUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.BeanFactoryAware; import org.springframework.beans.factory.annotation.Configurable; import org.springframework.util.StringUtils; import com.btmatthews.dmf.domain.IEntity; import com.btmatthews.dmf.domain.IEntityFactory; import com.btmatthews.dmf.domain.IEntityID; import com.btmatthews.dmf.spring.IEntityDefinitionBean; /** * This class represents the serialized form of a domain object implemented * using CGLib. The readResolve() method recreates the actual domain object * after it has been deserialized into Serializable. You must define * &lt;spring-configured/&gt; in the application context. * * @param <S> * The interface that defines the properties of the base domain * object. * @param <T> * The interface that defines the properties of the derived domain * object. * @author <a href="mailto:[email protected]">Brian Matthews</a> * @version 1.0 */ @Configurable(preConstruction = true) public final class SerializedCGLibEntity<S extends IEntity<S>, T extends S> implements Serializable, BeanFactoryAware { /** * Used for logging. */ private static final Logger LOG = LoggerFactory .getLogger(SerializedCGLibEntity.class); /** * The serialization version number. */ private static final long serialVersionUID = 3830830321957878319L; /** * The application context. Note this is not serialized. */ private transient BeanFactory beanFactory; /** * The domain object name. */ private String entityName; /** * The domain object identifier. */ private IEntityID<S> entityId; /** * The domain object version number. */ private long entityVersion; /** * The attributes of the domain object. */ private HashMap<?, ?> entityAttributes; /** * The default constructor. */ public SerializedCGLibEntity() { SerializedCGLibEntity.LOG .debug("Initializing with default constructor"); } /** * Initialise with the attributes to be serialised. * * @param name * The entity name. * @param id * The domain object identifier. * @param version * The entity version. * @param attributes * The entity attributes. */ public SerializedCGLibEntity(final String name, final IEntityID<S> id, final long version, final HashMap<?, ?> attributes) { SerializedCGLibEntity.LOG .debug("Initializing with parameterized constructor"); this.entityName = name; this.entityId = id; this.entityVersion = version; this.entityAttributes = attributes; } /** * Inject the bean factory. * * @param factory * The bean factory. */ public void setBeanFactory(final BeanFactory factory) { SerializedCGLibEntity.LOG.debug("Injected bean factory"); this.beanFactory = factory; } /** * Called after deserialisation. The corresponding entity factory is * retrieved from the bean application context and BeanUtils methods are * used to initialise the object. * * @return The initialised domain object. * @throws ObjectStreamException * If there was a problem creating or initialising the domain * object. */ public Object readResolve() throws ObjectStreamException { SerializedCGLibEntity.LOG.debug("Transforming deserialized object"); final T entity = this.createEntity(); entity.setId(this.entityId); try { PropertyUtils.setSimpleProperty(entity, "version", this.entityVersion); for (Map.Entry<?, ?> entry : this.entityAttributes.entrySet()) { PropertyUtils.setSimpleProperty(entity, entry.getKey() .toString(), entry.getValue()); } } catch (IllegalAccessException e) { throw new InvalidObjectException(e.getMessage()); } catch (InvocationTargetException e) { throw new InvalidObjectException(e.getMessage()); } catch (NoSuchMethodException e) { throw new InvalidObjectException(e.getMessage()); } return entity; } /** * Lookup the entity factory in the application context and create an * instance of the entity. The entity factory is located by getting the * entity definition bean and using the factory registered with it or * getting the entity factory. The name used for the definition bean lookup * is ${entityName}Definition while ${entityName} is used for the factory * lookup. * * @return The domain object instance. * @throws ObjectStreamException * If the entity definition bean or entity factory were not * available. */ @SuppressWarnings("unchecked") private T createEntity() throws ObjectStreamException { SerializedCGLibEntity.LOG.debug("Getting domain object factory"); // Try to use the entity definition bean final IEntityDefinitionBean<S, T> entityDefinition = (IEntityDefinitionBean<S, T>)this.beanFactory .getBean(StringUtils.uncapitalize(this.entityName) + "Definition", IEntityDefinitionBean.class); if (entityDefinition != null) { final IEntityFactory<S, T> entityFactory = entityDefinition .getFactory(); if (entityFactory != null) { SerializedCGLibEntity.LOG .debug("Domain object factory obtained via enity definition bean"); return entityFactory.create(); } } // Try to use the entity factory final IEntityFactory<S, T> entityFactory = (IEntityFactory<S, T>)this.beanFactory .getBean(StringUtils.uncapitalize(this.entityName) + "Factory", IEntityFactory.class); if (entityFactory != null) { SerializedCGLibEntity.LOG .debug("Domain object factory obtained via direct look-up"); return entityFactory.create(); } // Neither worked! SerializedCGLibEntity.LOG.warn("Cannot find domain object factory"); throw new InvalidObjectException( "No entity definition or factory found for " + this.entityName); } }

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• Generic IBindingListView Implementations

  - by Brad Leach

  Can anyone suggest a good implementation of a generic collection class that implements the IBindingListView & IBindingList interfaces and provides Filtering and Searching capabilities? I see my current options as: Using a class that someone else has written and tested Inheriting from BindingList, and implementing the IBindingListView interfaces Write a custom collection from scratch, implementing IBindingListView and IBindingList. Obviously, the first option is my preferred choice. Thanking you.

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• ggplot geom_bar - to many bars

  - by Andreas

  I am sorry for the non-informative title. exstatus <- structure(list(org = structure(c(2L, 1L, 7L, 3L, 6L, 2L, 2L, 7L, 2L, 1L, 2L, 2L, 4L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 8L, 4L, 2L, 2L, 5L, 7L, 8L, 6L, 2L, 7L, 2L, 2L, 7L, 2L, 2L, 2L, 2L, 4L, 2L, 2L, 1L, 2L, 2L, 7L, 2L, 7L, 2L, 4L, 7L, 2L, 4L, 2L, 2L, 2L, 7L, 7L, 2L, 7L, 2L, 7L, 1L, 7L, 5L, 2L, 2L, 1L, 7L, 3L, 5L, 3L, 2L, 2L, 2L, 7L, 4L, 2L, 7L, 2L, 4L, 2L, 2L, 2L, 4L, 6L, 2L, 4L, 4L, 7L, 2L, 2L, 2L, 7L, 6L, 2L, 2L, 1L, 2L, 2L, 4L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 6L, 2L, 7L, 7L, 2L, 7L, 8L, 7L, 8L, 6L, 7L, 2L, 2L, 2L, 7L, 2L, 7L, 2L, 7L, 2L, 7L, 2L, 4L, 2L, 7L, 2L, 4L, 8L, 2L, 3L, 4L, 2L, 7L, 3L, 8L, 8L, 6L, 2L, 2L, 2L, 7L, 7L, 7L, 7L, 2L, 2L, 2L, 2L, 7L, 2L, 4L, 7L, 7L, 8L, 2L, 7L, 2L, 2L, 2L, 2L, 1L, 7L, 7L, 2L, 1L, 7L, 2L, 7L, 7L, 2L, 2L, 7L, 2L, 2L, 7L, 7L, 2L, 7L, 2L, 7L, 5L, 2L), .Label = c("gl", "il", "gm", "im", "gk", "ik", "tv", "tu"), class = "factor"), art = structure(c(2L, 1L, 3L, 1L, 2L, 2L, 2L, 3L, 2L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 3L, 2L, 2L, 2L, 1L, 3L, 3L, 2L, 2L, 3L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L, 2L, 3L, 2L, 3L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 2L, 3L, 2L, 3L, 1L, 3L, 1L, 2L, 2L, 1L, 3L, 1L, 1L, 1L, 2L, 2L, 2L, 3L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 1L, 2L, 2L, 2L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L, 2L, 3L, 3L, 2L, 3L, 3L, 3L, 3L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 2L, 3L, 2L, 1L, 2L, 2L, 3L, 1L, 3L, 3L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 3L, 3L, 3L, 2L, 3L, 2L, 2L, 2L, 2L, 1L, 3L, 3L, 2L, 1L, 3L, 2L, 3L, 3L, 2L, 2L, 3L, 2L, 2L, 3L, 3L, 2L, 3L, 2L, 3L, 1L, 2L), .Label = c("Finish", "Attending", "Something"), class = "factor"), type = structure(c(2L, 2L, 5L, 3L, 1L, 2L, 2L, 5L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 4L, 3L, 2L, 2L, 1L, 5L, 4L, 1L, 2L, 5L, 2L, 2L, 5L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 5L, 2L, 5L, 2L, 3L, 5L, 2L, 3L, 2L, 2L, 2L, 5L, 5L, 2L, 5L, 2L, 5L, 2L, 5L, 1L, 2L, 2L, 2L, 5L, 3L, 1L, 3L, 2L, 2L, 2L, 5L, 3L, 2L, 5L, 2L, 3L, 2L, 2L, 2L, 3L, 1L, 2L, 3L, 3L, 5L, 2L, 2L, 2L, 5L, 1L, 2L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 2L, 5L, 5L, 2L, 5L, 4L, 5L, 4L, 1L, 5L, 2L, 2L, 2L, 5L, 2L, 5L, 2L, 5L, 2L, 5L, 2L, 3L, 2L, 5L, 2L, 3L, 4L, 2L, 3L, 3L, 2L, 5L, 3L, 4L, 4L, 1L, 2L, 2L, 2L, 5L, 5L, 5L, 5L, 2L, 2L, 2L, 2L, 5L, 2L, 3L, 5L, 5L, 4L, 2L, 5L, 2L, 2L, 2L, 2L, 2L, 5L, 5L, 2L, 2L, 5L, 2L, 5L, 5L, 2L, 2L, 5L, 2L, 2L, 5L, 5L, 2L, 5L, 2L, 5L, 1L, 2L), .Label = c("short", "long", "between", "young", "old"), class = "factor")), .Names = c("org", "art", "type"), row.names = c(NA, -192L), class = "data.frame") and then the plot ggplot(exstatus, aes(x=type, fill=art))+ geom_bar(aes(y=..count../sum(..count..)),position="dodge") The problem is that the two rightmost bars ("young", "old") are too thick - "something" takes up the whole width - whcih is not what I intended. I am sorry that I can not explain it better.

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• does the object creating a sub appdomain get instantiated in that sub appdomain?

  - by Eric

  does the object creating a sub appdomain get instantiated in that sub appdomain? I have an object that is in the main AppDomain and it is creating another AppDomain and it requires the calling class to be serializable and is creating an instance of the calling class in the new sub AppDomain. I'm wondering if that is how it is, or if there is a way that I can create the sub appDomain but still hold on to the original instantiation of the calling object in the main appDomain

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• Simple linq question: using linq to get an array of properties

  - by Joel Barsotti

  Lets say we have a simple class public class Foo { public string FooName; } Now we want to do some simple work on it. public void SomeCallerMethod(List<Foo> listOfFoos) { string[] fooNames = listOfFoo. // What to do here? } If I even knew what method to call, I could probably find the rest of the peices.

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• how can i inherit from both QWidget and QThread?

  - by rashid

  I have a class like this class GUI : public QWidget, public QThread When I do the above i get errors about connect signals. The error says "Reference to "connect" is ambiguous". Is there a way to inherit from both? Thank you

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• Android remote service doesn't call service methods

  - by tarantel

  Hello, I'm developing a GPS tracking software on android. I need IPC to control the service from different activities. So I decide to develop a remote service with AIDL. This wasn't a big problem but now it's always running into the methods of the interface and not into those of my service class. Maybe someone could help me? Here my ADIL file: package test.de.android.tracker interface ITrackingServiceRemote { void startTracking(in long trackId); void stopTracking(); void pauseTracking(); void resumeTracking(in long trackId); long trackingState(); } And the here a short version of my service class: public class TrackingService extends Service implements LocationListener{ private LocationManager mLocationManager; private TrackDb db; private long trackId; private boolean isTracking = false; @Override public void onCreate() { super.onCreate(); mNotificationManager = (NotificationManager) this .getSystemService(NOTIFICATION_SERVICE); mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE); db = new TrackDb(this.getApplicationContext()); } @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); } @Override public void onDestroy(){ //TODO super.onDestroy(); } @Override public IBinder onBind(Intent intent){ return this.mBinder; } private IBinder mBinder = new ITrackingServiceRemote.Stub() { public void startTracking(long trackId) throws RemoteException { TrackingService.this.startTracking(trackId); } public void pauseTracking() throws RemoteException { TrackingService.this.pauseTracking(); } public void resumeTracking(long trackId) throws RemoteException { TrackingService.this.resumeTracking(trackId); } public void stopTracking() throws RemoteException { TrackingService.this.stopTracking(); } public long trackingState() throws RemoteException { long state = TrackingService.this.trackingState(); return state; } }; public synchronized void startTracking(long trackId) { // request updates every 250 meters or 0 sec this.trackId = trackId; mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 250, this); isTracking = true; } public synchronized long trackingState() { if(isTracking){ return trackId; } else return -1; } public synchronized void stopTracking() { if(isTracking){ mLocationManager.removeUpdates(this); isTracking = false; } else Log.i(TAG, "Could not stop because service is not tracking at the moment"); } public synchronized void resumeTracking(long trackId) { if(!isTracking){ this.trackId = trackId; mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 250, this); isTracking = true; } else Log.i(TAG, "Could not resume because service is tracking already track " + this.trackId); } public synchronized void pauseTracking() { if(isTracking){ mLocationManager.removeUpdates(this); isTracking = false; } else Log.i(TAG, "Could not pause because service is not tracking at the moment"); } public void onLocationChanged(Location location) { //TODO } For easier access from the client I wrote a ServiceManager class which sets up the ServiceConnection and you can call the service methods. Here my code for this: public class TrackingServiceManager{ private static final String TAG = "TrackingServiceManager"; private ITrackingServiceRemote mService = null; private Context mContext; private Boolean isBound = false; private ServiceConnection mServiceConnection; public TrackingServiceManager(Context ctx){ this.mContext = ctx; } public void start(long trackId) { if (isBound && mService != null) { try { mService.startTracking(trackId); } catch (RemoteException e) { Log.e(TAG, "Could not start tracking!",e); } } else Log.i(TAG, "No Service bound! 1"); } public void stop(){ if (isBound && mService != null) { try { mService.stopTracking(); } catch (RemoteException e) { Log.e(TAG, "Could not stop tracking!",e); } } else Log.i(TAG, "No Service bound!"); } public void pause(){ if (isBound && mService != null) { try { mService.pauseTracking(); } catch (RemoteException e) { Log.e(TAG, "Could not pause tracking!",e); } } else Log.i(TAG, "No Service bound!"); } public void resume(long trackId){ if (isBound && mService != null) { try { mService.resumeTracking(trackId); } catch (RemoteException e) { Log.e(TAG, "Could not resume tracking!",e); } } else Log.i(TAG, "No Service bound!"); } public float state(){ if (isBound && mService != null) { try { return mService.trackingState(); } catch (RemoteException e) { Log.e(TAG, "Could not resume tracking!",e); return -1; } } else Log.i(TAG, "No Service bound!"); return -1; } /** * Method for binding the Service with client */ public boolean connectService(){ mServiceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { TrackingServiceManager.this.mService = ITrackingServiceRemote.Stub.asInterface(service); } } @Override public void onServiceDisconnected(ComponentName name) { if (mService != null) { mService = null; } } }; Intent mIntent = new Intent("test.de.android.tracker.action.intent.TrackingService"); this.isBound = this.mContext.bindService(mIntent, mServiceConnection, Context.BIND_AUTO_CREATE); return this.isBound; } public void disconnectService(){ this.mContext.unbindService(mServiceConnection); this.isBound = false; } } If i now try to call a method from an activity for example start(trackId) nothing happens. The binding is OK. When debugging it always runs into the startTracking() in the generated ITrackingServiceRemote.java file and not into my TrackingService class. Where is the problem? I can't find anything wrong. Thanks in advance! Tobias

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• Is there some performance issue between leaving empty ListProperties or using dynamic (expando) prop

  - by indiehacker

  Is there a datastore performance difference between adding dynamic properties of the expando class when they are needed for an entity or the simpler (for me) framework of just setting up all possible properties I might need from the start even though most instances will just be left empty. In my specific case I would be having 5-8 empty ReferenceList properties as 'overhead' that will be empty when I skip using expando class.

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• In Ruby, how does coerce() actually work?

  - by Jian Lin

  It is said that when we have a class Point and knows how to perform point * 3 like the following: class Point def initialize(x,y) @x, @y = x, y end def *(c) Point.new(@x * c, @y * c) end end point = Point.new(1,2) p point p point * 3 Output: #<Point:0x336094 @x=1, @y=2> #<Point:0x335fa4 @x=3, @y=6> but then, 3 * point is not understood: Point can't be coerced into Fixnum (TypeError) So we need to further define an instance method coerce: class Point def coerce(something) [self, something] end end p 3 * point Output: #<Point:0x3c45a88 @x=3, @y=6> So it is said that 3 * point is the same as 3.*(point) that is, the instance method * takes an argument point and invoke on the object 3. Now, since this method * doesn't know how to multiply a point, so point.coerce(3) will be called, and get back an array: [point, 3] and then * is once again applied to it, is that true? point * 3 which is the same as point.*(3) and now, this is understood and we now have a new Point object, as performed by the instance method * of the Point class. The question is: 1) who invokes point.coerce(3) ? Is it Ruby automatically, or is it some code inside of * method of Fixnum by catching an exception? Or is it by case statement that when it doesn't know one of the known types, then call coerce? 2) Does coerce always need to return an array of 2 elements? Can it be no array? Or can it be an array of 3 elements? 3) And is the rule that, the original operator (or method) * will then be invoked on element 0, with the argument of element 1? (element 0 and element 1 are the two elements in that array returned by coerce) Who does it? Is it done by Ruby or is it done by code in Fixnum? If it is done by code in Fixnum, then it is a "convention" that everybody follows when doing a coerce? So could it be the code in * of Fixnum do something like this: if (something.typeof? ...) else if ... # other type else if ... # other type else # if it is not a type I know array = something.coerce(self) return array[0].*(array[1]) end

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• adjusting table content with javascript by enumerating rows

  - by Tom

  I have a table row with 4 columns on my ecommerce site and I want to replace the content of 1st column if total amount in last column (TD class "total") is over 10 EUR. How can I do this with javascript only, I guess somehow to enumerate through the table rows and look for a correct row (one with the last column class as total) and then access the content of 1st column on this row but how?

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• Asp.net MVC 3 Razor code problem in a if statement

  - by ray247

  I have the following asp.net mvc 3 razor code, where "item" is my model, <a @if (item.Selected) { class="youarehere" } href="@item.Href" title="@item.Title">@item.Description</a> This code throws up the following error, CS1513: } expected which is pointing to class="youarehere" portion of the code, but I could not figure out why. Could someone help point out how to fix it please? Thank you.

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• How to find about structure of bitmap and JPEG files?

  - by Sorush Rabiee

  I'm trying to write a very simple image processing program for fun and practice. I was using System.Drawing. ... .Bitmap class to handle images and edit their data. but now I want to write my own class of Bitmap object implementation and want to know how bmp files (and other common bitmap formats) and their meta-data (indexing, color system & etc) are stored in files, and how to read and write them directly?

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• Superfish drag-drop problem

  - by HasanGursoy

  Hi, I've created a menu with jQuery superfish but I'm having problem when drag-drop on one of the top menu items. .sfHover class is added when pressed on a item and if this item is not clicked and dropped item remains with .sfHover class and because of this, background of the item is changed. How can I fix this problem? Here is the demo.

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• JSON output of a view in Grails

  - by daliz

  Ok, I have a very simple app created in Grails. I have a generated domain class (Person) and its generated controller, using the automatic Grails scaffold: package contacts class PersonController { def scaffold = Person } Now I'd like to get a JSON representation of a Person object. Do I have to change the view or the controller? And how? Thank you.

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• Space in DIV ??

  - by alex

  Hello all, Is it possible to avoid the spaces X & Y (see image)? There is no padding in CSS! <html> <head> <title>Prova WIDGET</title> <link rel="stylesheet" href="jquery-ui-1.8.1.custom/css/ui-lightness/jquery-ui-1.8.1.custom.css" type="text/css"> <script src="jquery-ui-1.8.1.custom/development-bundle/jquery-1.4.2.js" type="text/javascript"></script> <script src="jquery-ui-1.8.1.custom/js/jquery-ui-1.8.1.custom.min.js" type="text/javascript"></script> <script type="text/javascript"> $(themify); function themify(){ $("#pulsante").addClass("ui-button ui-button-text-only ui-widget ui-state-default ui-corner-all"); //ui-button-text } </script> <style>#test{display:none}</style> <script type="text/javascript"> function rendiVisibile(){ if(document.getElementById("test").style.display = "none"){ $("#test").css({"width":"100px","float":"right","text-align":"center"}); $("#test").show("slide",{},1000); } } </script> </head> <body> <h2 class="ui-widget-header">Tentativo widget con DIV</h2> <form action=""> <input type="button" value="Submit" id="pulsante" onclick="rendiVisibile()";><br/></br> <div id="test" class="ui-widget ui-widget-content ui-corner-all"> <h3 class="ui-widget-header ui-corner-all">CIAO</h3> <p class="ui-widget-content ui-corner-all">Un saluto</p> </div> </form> </body> </html>

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• What happens on Activity.finish() with AsyncTask still running in background?

  - by stormin986

  What happens on Activity.finish() with an AsyncTask still running in background? Does it just pop the Activity off the Activity Stack, but wait to destroy the Activity object until the AsyncTask fully completes (since the AsyncTask is an inner class of my Activity)? Also, would it act any differently if the AsyncTask were a public, non-inner class that held no references to the instance of the Activity?

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• How to pass initialisation parameters to a web service in Netbeans

  - by Bob Roberts

  I have built a web web service with Netbeans 6.8 using the "Web Service from WSDL" wizard. It has generated the binding classes and a skeleton for the class implementing the web service. I've set some initialization parameters in web.xml, under the servlet corresponding to the web service. Now I'd like to pass those parameters to the class implementing the web service. How can this be achieved (preferably without editing any of the code auto-generated by Netbeans)?

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