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• Spring Security and the Synchronizer Token J2EE pattern, problem when authentication fails.

  - by dfuse

  Hey, we are using Spring Security 2.0.4. We have a TransactionTokenBean which generates a unique token each POST, the bean is session scoped. The token is used for the duplicate form submission problem (and security). The TransactionTokenBean is called from a Servlet filter. Our problem is the following, after a session timeout occured, when you do a POST in the application Spring Security redirects to the logon page, saving the original request. After logging on again the TransactionTokenBean is created again, since it is session scoped, but then Spring forwards to the originally accessed url, also sending the token that was generated at that time. Since the TransactionTokenBean is created again, the tokens do not match and our filter throws an Exception. I don't quite know how to handle this elegantly, (or for that matter, I can't even fix it with a hack), any ideas? This is the code of the TransactionTokenBean: public class TransactionTokenBean implements Serializable { public static final int TOKEN_LENGTH = 8; private RandomizerBean randomizer; private transient Logger logger; private String expectedToken; public String getUniqueToken() { return expectedToken; } public void init() { resetUniqueToken(); } public final void verifyAndResetUniqueToken(String actualToken) { verifyUniqueToken(actualToken); resetUniqueToken(); } public void resetUniqueToken() { expectedToken = randomizer.getRandomString(TOKEN_LENGTH, RandomizerBean.ALPHANUMERICS); getLogger().debug("reset token to: " + expectedToken); } public void verifyUniqueToken(String actualToken) { if (getLogger().isDebugEnabled()) { getLogger().debug("verifying token. expected=" + expectedToken + ", actual=" + actualToken); } if (expectedToken == null || actualToken == null || !isValidToken(actualToken)) { throw new IllegalArgumentException("missing or invalid transaction token"); } if (!expectedToken.equals(actualToken)) { throw new InvalidTokenException(); } } private boolean isValidToken(String actualToken) { return StringUtils.isAlphanumeric(actualToken); } public void setRandomizer(RandomizerBean randomizer) { this.randomizer = randomizer; } private Logger getLogger() { if (logger == null) { logger = Logger.getLogger(TransactionTokenBean.class); } return logger; } } and this is the Servlet filter (ignore the Ajax stuff): public class SecurityFilter implements Filter { static final String AJAX_TOKEN_PARAM = "ATXTOKEN"; static final String TOKEN_PARAM = "TXTOKEN"; private WebApplicationContext webApplicationContext; private Logger logger = Logger.getLogger(SecurityFilter.class); public void init(FilterConfig config) { setWebApplicationContext(WebApplicationContextUtils.getWebApplicationContext(config.getServletContext())); } public void destroy() { } public void doFilter(ServletRequest req, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; if (isPostRequest(request)) { if (isAjaxRequest(request)) { log("verifying token for AJAX request " + request.getRequestURI()); getTransactionTokenBean(true).verifyUniqueToken(request.getParameter(AJAX_TOKEN_PARAM)); } else { log("verifying and resetting token for non-AJAX request " + request.getRequestURI()); getTransactionTokenBean(false).verifyAndResetUniqueToken(request.getParameter(TOKEN_PARAM)); } } chain.doFilter(request, response); } private void log(String line) { if (logger.isDebugEnabled()) { logger.debug(line); } } private boolean isPostRequest(HttpServletRequest request) { return "POST".equals(request.getMethod().toUpperCase()); } private boolean isAjaxRequest(HttpServletRequest request) { return request.getParameter("AJAXREQUEST") != null; } private TransactionTokenBean getTransactionTokenBean(boolean ajax) { return (TransactionTokenBean) webApplicationContext.getBean(ajax ? "ajaxTransactionTokenBean" : "transactionTokenBean"); } void setWebApplicationContext(WebApplicationContext context) { this.webApplicationContext = context; } }

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• Trouble with datasource not being called from viewWillAppear

  - by user278859

  A little background. I have taken GCCalendar which only works in portrait orientation and extended it to work in landscape similar to how the iPhone's Calendar app works. I did this by duplicating the main view class and modifying it to work in landscape. So when the phone is in portrait orientation the CGCalendar is instantiated from the apps main view controller using the original portrait view class and when in landscape orientation using the new modified landscape view class. Most of the other classes in GCCalendar are shared without modification. A few had to be duplicated as well. I got it all working great except for an issue with the datasource. The datasource is called when the calendar is first loaded and each time the user changes the dates being viewed. Problem is I can't get the datasource call to work on the first call. I am stumped as it works fine in portrait orientation and I cannot find any difference between the 2 versions. Following is some of the code that shows how it gets to the datasource call the first time. Subsequent calls removes all the calendar subviews and instantiates them again with the new dates. The duplicated landscape class names end in LS. Otherwise as you can see they are identical. Does anyone has any idea of where else I might look to resolve this issue? Thanks, John -------------------------------- //App main view controller - (void)showLandscapeCalendar { GCCalendarLandscapeView *calendar = [[[GCCalendarLandscapeView alloc] init] autorelease]; calendar.dataSource = self; calendar.delegate = self; navigationController = [[UINavigationController alloc] initWithRootViewController:calendar]; [self presentModalViewController:navigationController animated:YES]; } - (void)showPortraitCalendar { GCCalendarPortraitView *calendar = [[[GCCalendarPortraitView alloc] init] autorelease]; calendar.dataSource = self; calendar.delegate = self; navigationController = [[UINavigationController alloc] initWithRootViewController:calendar]; [self presentModalViewController:navigationController animated:YES]; } - (NSArray *)calendarEventsForDate:(NSDate *)date{ //build and return the events array //this is the protocol datasource method //It is supposed to run every time the date changes in the calendar } ------------------------------- // GCCalendarLandscapeView... - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; if (viewDirty) { [self reloadDayAnimated:NO context:NULL]; viewDirty = NO; } viewVisible = YES; } - (void)reloadDayAnimated:(BOOL)animated context:(void *)context { GCCalendarDayViewLS *nextDayView = [[GCCalendarDayViewLS alloc] initWithCalendarView:self]; } ------------------------------- //GCCalendarDayViewLS - (id)initWithCalendarView:(GCCalendarView *)view { if (self = [super init]) { dataSource = view.dataSource; } return self; } - (void)reloadData { //** first time through the dataSource method does not run events = [dataSource calendarEventsForDate:date]; } ------------------------------- // GCCalendarPortraitView... - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; if (viewDirty) { [self reloadDayAnimated:NO context:NULL]; viewDirty = NO; } viewVisible = YES; } - (void)reloadDayAnimated:(BOOL)animated context:(void *)context { GCCalendarDayView *nextDayView = [[GCCalendarDayView alloc] initWithCalendarView:self]; } ------------------------------- //GCCalendarDayView - (id)initWithCalendarView:(GCCalendarView *)view { if (self = [super init]) { dataSource = view.dataSource; } return self; } - (void)reloadData { **//this one works every time events = [dataSource calendarEventsForDate:date]; }

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• Typesafe fire-and-forget asynchronous delegate invocation in C#

  - by LBushkin

  I recently found myself needing a typesafe "fire-and-forget" mechanism for running code asynchronously. Ideally, what I would want to do is something like: var myAction = (Action)(() => Console.WriteLine("yada yada")); myAction.FireAndForget(); // async invocation Unfortunately, the obvious choice of calling BeginInvoke() without a corresponding EndInvoke() does not work - it results in a slow resource leak (since the asyn state is held by the runtime and never released ... it's expecting an eventual call to EndInvoke(). I also can't run the code on the .NET thread pool because it may take a very long time to complete (it's advised to only run relatively short-lived code on the thread pool) - this makes it impossible to use the ThreadPool.QueueUserWorkItem(). Initially, I only needed this behavior for methods whose signature matches Action, Action<...>, or Func<...>. So I put together a set of extension methods (see listing below) that let me do this without running into the resource leak. There are overloads for each version of Action/Func. Unfortunately, I now want to port this code to .NET 4 where the number of generic parameters on Action and Func have been increased substantially. Before I write a T4 script to generate these, I was also hoping to find a simpler more elegant way to do this. Any ideas are welcome. public static class AsyncExt { public static void FireAndForget( this Action action ) { action.BeginInvoke(OnActionCompleted, action); } public static void FireAndForget<T1>( this Action<T1> action, T1 arg1 ) { action.BeginInvoke(arg1, OnActionCompleted<T1>, action); } public static void FireAndForget<T1,T2>( this Action<T1,T2> action, T1 arg1, T2 arg2 ) { action.BeginInvoke(arg1, arg2, OnActionCompleted<T1, T2>, action); } public static void FireAndForget<TResult>(this Func<TResult> func, TResult arg1) { func.BeginInvoke(OnFuncCompleted<TResult>, func); } public static void FireAndForget<T1,TResult>(this Func<T1, TResult> action, T1 arg1) { action.BeginInvoke(arg1, OnFuncCompleted<T1,TResult>, action); } // more overloads of FireAndForget<..>() for Action<..> and Func<..> private static void OnActionCompleted( IAsyncResult result ) { var action = (Action)result.AsyncState; action.EndInvoke(result); } private static void OnActionCompleted<T1>( IAsyncResult result ) { var action = (Action<T1>)result.AsyncState; action.EndInvoke( result ); } private static void OnActionCompleted<T1,T2>(IAsyncResult result) { var action = (Action<T1,T2>)result.AsyncState; action.EndInvoke(result); } private static void OnFuncCompleted<TResult>( IAsyncResult result ) { var func = (Func<TResult>)result.AsyncState; func.EndInvoke( result ); } private static void OnFuncCompleted<T1,TResult>(IAsyncResult result) { var func = (Func<T1, TResult>)result.AsyncState; func.EndInvoke(result); } // more overloads of OnActionCompleted<> and OnFuncCompleted<> }

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• Recursively created linked lists with a class, C++

  - by Jon Brant

  I'm using C++ to recursively make a hexagonal grid (using a multiply linked list style). I've got it set up to create neighboring tiles easily, but because I'm doing it recursively, I can only really create all 6 neighbors for a given tile. Obviously, this is causing duplicate tiles to be created and I'm trying to get rid of them in some way. Because I'm using a class, checking for null pointers doesn't seem to work. It's either failing to convert from my Tile class to and int, or somehow converting it but not doing it properly. I'm explicitly setting all pointers to NULL upon creation, and when I check to see if it still is, it says it's not even though I never touched it since initialization. Is there a specific way I'm supposed to do this? I can't even traverse the grid without NULLs of some kind Here's some of my relevant code. Yes, I know it's embarassing. Tile class header: class Tile { public: Tile(void); Tile(char *Filename); ~Tile(void); void show(void); bool LoadGLTextures(); void makeDisplayList(); void BindTexture(); void setFilename(char *newName); char Filename[100]; GLuint texture[2]; GLuint displayList; Tile *neighbor[6]; float xPos, yPos,zPos; };` Tile Initialization: Tile::Tile(void) { xPos=0.0f; yPos=0.0f; zPos=0.0f; glEnable(GL_DEPTH_TEST); strcpy(Filename, strcpy(Filename, "Data/BlueTile.bmp")); if(!BuildTexture(Filename, texture[0]))MessageBox(NULL,"Texture failed to load!","Crap!",MB_OK|MB_ICONASTERISK); for(int x=0;x<6;x++) { neighbor[x]=NULL; } } Creation of neighboring tiles: void MakeNeighbors(Tile *InputTile, int stacks) { for(int x=0;x<6;x++) { InputTile->neighbor[x]=new Tile();InputTile->neighbor[x]->xPos=0.0f;InputTile->neighbor[x]->yPos=0.0f;InputTile->zPos=float(stacks); } if(stacks) { for(int x=0;x<6;x++)MakeNeighbors(InputTile->neighbor[x],stacks-1); } } And finally, traversing the grid: void TraverseGrid(Tile *inputTile) { Tile *temp; for(int x=0;x<6;x++) if(inputTile->neighbor[x]) { temp=inputTile->neighbor[x]; temp->xPos=0.0f; TraverseGrid(temp); //MessageBox(NULL,"Not Null!","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); } } The key line is "if(inputTile-neighbor[x])" and whether I make it "if(inputTile-neighbor[x]==NULL)" or whatever I do, it just isn't handling it properly. Oh and I'm also aware that I haven't set up the list fully. It's only one direction now.

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• Canceling in Sqlite

  - by Yusuf

  I am trying to use handle database with insert, update, and delete such as notepad. I'm having problems in canceling data .In normal case which presses the confirm button, it will be saved into sqlite and will be displayed on listview. How can I make cancel event through back key or more button event? I want my Button and back key to cancel data but its keep on saving... public static int numTitle = 1; public static String curDate = ""; private EditText mTitleText; private EditText mBodyText; private Long mRowId; private NotesDbAdapter mDbHelper; private TextView mDateText; private boolean isOnBackeyPressed; public SQLiteDatabase db; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mDbHelper = new NotesDbAdapter(this); mDbHelper.open(); setContentView(R.layout.note_edit); setTitle(R.string.edit_note); mTitleText = (EditText) findViewById(R.id.etTitle_NE); mBodyText = (EditText) findViewById(R.id.etBody_NE); mDateText = (TextView) findViewById(R.id.tvDate_NE); long msTime = System.currentTimeMillis(); Date curDateTime = new Date(msTime); SimpleDateFormat formatter = new SimpleDateFormat("d'/'M'/'y"); curDate = formatter.format(curDateTime); mDateText.setText("" + curDate); Button confirmButton = (Button) findViewById(R.id.bSave_NE); Button cancelButton = (Button) findViewById(R.id.bCancel_NE); Button deleteButton = (Button) findViewById(R.id.bDelete_NE); mRowId = (savedInstanceState == null) ? null : (Long) savedInstanceState .getSerializable(NotesDbAdapter.KEY_ROWID); if (mRowId == null) { Bundle extras = getIntent().getExtras(); mRowId = extras != null ? extras.getLong(NotesDbAdapter.KEY_ROWID) : null; } populateFields(); confirmButton.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { setResult(RESULT_OK); Toast.makeText(NoteEdit.this, "Saved", Toast.LENGTH_SHORT) .show(); finish(); } }); deleteButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub mDbHelper.deleteNote(mRowId); Toast.makeText(NoteEdit.this, "Deleted", Toast.LENGTH_SHORT) .show(); finish(); } }); cancelButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub boolean diditwork = true; try { db.beginTransaction(); populateFields(); db.setTransactionSuccessful(); } catch (SQLException e) { diditwork = false; } finally { db.endTransaction(); if (diditwork) { Toast.makeText(NoteEdit.this, "Canceled", Toast.LENGTH_SHORT).show(); } } } }); } private void populateFields() { if (mRowId != null) { Cursor note = mDbHelper.fetchNote(mRowId); startManagingCursor(note); mTitleText.setText(note.getString(note .getColumnIndexOrThrow(NotesDbAdapter.KEY_TITLE))); mBodyText.setText(note.getString(note .getColumnIndexOrThrow(NotesDbAdapter.KEY_BODY))); } } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); saveState(); outState.putSerializable(NotesDbAdapter.KEY_ROWID, mRowId); } public void onBackPressed() { super.onBackPressed(); isOnBackeyPressed = true; finish(); } @Override protected void onPause() { super.onPause(); if (!isOnBackeyPressed) saveState(); } @Override protected void onResume() { super.onResume(); populateFields(); } private void saveState() { String title = mTitleText.getText().toString(); String body = mBodyText.getText().toString(); if (mRowId == null) { long id = mDbHelper.createNote(title, body, curDate); if (id > 0) { mRowId = id; } } else { mDbHelper.updateNote(mRowId, title, body, curDate); } }`enter code here`

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• non blocking client server chat application in java using nio

  - by Amith

  I built a simple chat application using nio channels. I am very much new to networking as well as threads. This application is for communicating with server (Server / Client chat application). My problem is that multiple clients are not supported by the server. How do I solve this problem? What's the bug in my code? public class Clientcore extends Thread { SelectionKey selkey=null; Selector sckt_manager=null; public void coreClient() { System.out.println("please enter the text"); BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in)); SocketChannel sc = null; try { sc = SocketChannel.open(); sc.configureBlocking(false); sc.connect(new InetSocketAddress(8888)); int i=0; while (!sc.finishConnect()) { } for(int ii=0;ii>-22;ii++) { System.out.println("Enter the text"); String HELLO_REQUEST =stdin.readLine().toString(); if(HELLO_REQUEST.equalsIgnoreCase("end")) { break; } System.out.println("Sending a request to HelloServer"); ByteBuffer buffer = ByteBuffer.wrap(HELLO_REQUEST.getBytes()); sc.write(buffer); } } catch (IOException e) { e.printStackTrace(); } finally { if (sc != null) { try { sc.close(); } catch (Exception e) { e.printStackTrace(); } } } } public void run() { try { coreClient(); } catch(Exception ej) { ej.printStackTrace(); }}} public class ServerCore extends Thread { SelectionKey selkey=null; Selector sckt_manager=null; public void run() { try { coreServer(); } catch(Exception ej) { ej.printStackTrace(); } } private void coreServer() { try { ServerSocketChannel ssc = ServerSocketChannel.open(); try { ssc.socket().bind(new InetSocketAddress(8888)); while (true) { sckt_manager=SelectorProvider.provider().openSelector(); ssc.configureBlocking(false); SocketChannel sc = ssc.accept(); register_server(ssc,SelectionKey.OP_ACCEPT); if (sc == null) { } else { System.out.println("Received an incoming connection from " + sc.socket().getRemoteSocketAddress()); printRequest(sc); System.err.println("testing 1"); String HELLO_REPLY = "Sample Display"; ByteBuffer buffer = ByteBuffer.wrap(HELLO_REPLY.getBytes()); System.err.println("testing 2"); sc.write(buffer); System.err.println("testing 3"); sc.close(); }}} catch (IOException e) { e.printStackTrace(); } finally { if (ssc != null) { try { ssc.close(); } catch (IOException e) { e.printStackTrace(); } } } } catch(Exception E) { System.out.println("Ex in servCORE "+E); } } private static void printRequest(SocketChannel sc) throws IOException { ReadableByteChannel rbc = Channels.newChannel(sc.socket().getInputStream()); WritableByteChannel wbc = Channels.newChannel(System.out); ByteBuffer b = ByteBuffer.allocate(1024); // read 1024 bytes while (rbc.read(b) != -1) { b.flip(); while (b.hasRemaining()) { wbc.write(b); System.out.println(); } b.clear(); } } public void register_server(ServerSocketChannel ssc,int selectionkey_ops)throws Exception { ssc.register(sckt_manager,selectionkey_ops); }} public class HelloClient { public void coreClientChat() { Clientcore t=new Clientcore(); new Thread(t).start(); } public static void main(String[] args)throws Exception { HelloClient cl= new HelloClient(); cl.coreClientChat(); }} public class HelloServer { public void coreServerChat() { ServerCore t=new ServerCore(); new Thread(t).start(); } public static void main(String[] args) { HelloServer st= new HelloServer(); st.coreServerChat(); }}

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• Sqlite returns error

  - by ruruma

  I'm trying to implement loading data from database and put it into different views. But log cat returns error, that it cannot find "_id" column. Can somebody help me with this? SqlHelper Code public class FiboSqlHelper extends SQLiteOpenHelper { public static final String TABLE_FILMDB = "FiboFilmTop250"; public static final String COLUMN_ID = "_id"; private static final String DATABASE_NAME = "FiboFilmDb250.sqlite"; private static final int DATABASE_VERSION = 1; public static final String COLUMN_TITLE = "Title"; public static final String COLUMN_RATING = "Rating"; public static final String COLUMN_GENRE = "Genre"; public static final String COLUMN_TIME = "Time"; public static final String COLUMN_PREMDATE = "PremDate"; public static final String COLUMN_PLOT = "Plot"; private static final String DATABASE_CREATE = "create table "+TABLE_FILMDB+"("+COLUMN_ID +" integer primary key autoincrement, " +COLUMN_TITLE+" text not null "+COLUMN_RATING+" text not null "+COLUMN_GENRE+" text not null "+COLUMN_TIME+" text not null "+COLUMN_PREMDATE+" text not null "+COLUMN_PLOT+" "+"text not null)"; public FiboSqlHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); // TODO Auto-generated constructor stub } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub db.execSQL(DATABASE_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub Log.w(FiboSqlHelper.class.getName(), "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL("DROP TABLE IF EXISTS " + TABLE_FILMDB); onCreate(db); } }` SqlAdapterCode: public class FiboSqlAdapter { private SQLiteDatabase database; private FiboSqlHelper dbHelper; private String[] allColumns = {FiboSqlHelper.COLUMN_ID, FiboSqlHelper.COLUMN_TITLE, FiboSqlHelper.COLUMN_GENRE, FiboSqlHelper.COLUMN_PREMDATE, FiboSqlHelper.COLUMN_TIME, FiboSqlHelper.COLUMN_PLOT}; public FiboSqlAdapter (Context context){ dbHelper = new FiboSqlHelper(context); } public void open() throws SQLException { database = dbHelper.getWritableDatabase(); } public void close(){ dbHelper.close(); } public List<FilmDataEntity> getAllFilmData(){ List<FilmDataEntity> fDatas = new ArrayList<FilmDataEntity>(); Cursor cursor = database.query(FiboSqlHelper.TABLE_FILMDB, allColumns, null,null,null,null,null); cursor.moveToFirst(); while(!cursor.isAfterLast()){ FilmDataEntity fData = cursorToData(cursor); fDatas.add(fData); cursor.moveToNext(); } cursor.close(); return fDatas; } private FilmDataEntity cursorToData(Cursor cursor){ FilmDataEntity fData = new FilmDataEntity(); fData.setId(cursor.getLong(1)); fData.setTitle(cursor.getString(2)); fData.setRating(cursor.getString(6)); fData.setGenre(cursor.getString(4)); fData.setPremDate(cursor.getString(5)); fData.setShortcut(cursor.getString(8)); return fData; }} DataEntity: ` public class FilmDataEntity { private long id; private String title; private String rating; private String genre; private String premDate; private String shortcut; public String getShortcut() { return shortcut; } public void setShortcut(String shortcut) { this.shortcut = shortcut; } public String getGenre() { return genre; } public void setGenre(String genre) { this.genre = genre; } public String getPremDate() { return premDate; } public void setPremDate(String premDate) { this.premDate = premDate; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getRating() { return rating; } public void setRating(String rating) { this.rating = rating; } public long getId() { return id; } public void setId(long id) { this.id = id; } } Part from main activity: `List<FilmDataEntity> fE1; sqA = new FiboSqlAdapter(this); sqA.open(); fE1 = sqA.getAllFilmData(); `

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• Arduino: Putting servos in my class causes them to rotate all the way to one side

  - by user2526712

  I am trying to create a new class that controls two servos. My code compiles just fine. However, when I run it, the servos just turn all the way to one direction. This seems to happen when I try instantiating the class (when in the constructor, I attach the servos in the class to pins). In My class's header file, I have [UPDATED] #ifndef ServoController_h #define ServoController_h #include "Arduino.h" #include <Servo.h> class ServoController { public: ServoController(int rotateServoPin, int elevateServoPin); void rotate(int degrees); void elevate(int degrees); private: Servo rotateServo; Servo elevateServo; int elevationAngle; int azimuthAngle; }; #endif Code so far for my Class: #include "Arduino.h" #include "ServoController.h" ServoController::ServoController(int rotateServoPin, int elevateServoPin) { azimuthAngle = 0; elevationAngle = 0; elevateServo.attach(elevateServoPin); rotateServo.attach(rotateServoPin); } void ServoController::rotate(int degrees) { //TO DO rotateServo.write(degrees); } void ServoController::elevate(int degrees) { //TO DO elevateServo.write(degrees); } And finally my arduino sketch so far is just: #include <ServoController.h> #include <Servo.h> ServoController sc(2 , 3); void setup() { } void loop() { } I'm pretty sure the circuit I am using is fine, since if I do not use my class, and just use the servo library directly in my arduino file, the servos move correctly. any ideas why this might happen? [UPDATE] I actually got this working. In my constructor, I have removed the lines to attach the servos to pins. Instead, I have added another method to my class which does the attachment. ServoController::ServoController(int rotateServoPin, int elevateServoPin) { azimuthAngle = 0; elevationAngle = 0; // elevateServo.attach(elevateServoPin); // rotateServo.attach(rotateServoPin); } void ServoController::attachPins(int rotateServoPin, int elevateServoPin) { azimuthAngle = 0; elevationAngle = 0; elevateServo.attach(elevateServoPin); rotateServo.attach(rotateServoPin); } I then call this in my sketch's setup() function: void setup() { sc.attachPins(2,3); } It seems like if I attach my servos outside of the setup() function, my problem occurs. [UPDATE July 27 9:13PM] Verified something with another test: I created a new sketch where I attached a servo before setup(): #include <Servo.h> Servo servo0; servo0.attach(2); void setup() { } void loop() // this function runs repeatedly after setup() finishes { servo0.write(90); delay(2000); servo0.write(135); delay(2000); servo0.write(45); delay(2000); } When I try to compile, Arduino throws an error: "testservotest:4: error: expected constructor, destructor, or type conversion before '.' token" So there was an error, but it was not thrown when the attach method was called from a class Thanks very much

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• Android Expandable List View Update

  - by Gaurav Arora

  I am implementing a chatting application, where I have made a service to listen all the presence changed. On the change of the presence I want to update the data and I am unable to update the data that is showing in the expandable list view. Please suggest me a means to do the same. public class UserMenuActivity extends ExpandableListActivity { private XMPPConnection connection; String name,availability,subscriptionStatus; TextView tv_Status; /** Variable Define here */ private String[] data = { "View my profile", "New Multiperson Chat", "New Broad Cast Message", "New Contact Category", "New Group", "Invite to CCM", "Search", "Expand All", "Settings", "Help", "Close" }; private String[] data_Contact = { "Rename Category","Move Contact to Category", "View my profile", "New Multiperson Chat", "New Broad Cast Message", "New Contact Category", "New Group", "Invite to CCM", "Search", "Expand All", "Settings", "Help", "Close" }; private String[] data_child_contact = { "Open chat", "Delete Contact","View my profile", "New Multiperson Chat", "New Broad Cast Message", "New Contact Category", "New Group", "Invite to CCM", "Search", "Expand All", "Settings", "Help", "Close" }; private String[] menuItem = { "Chats", "Contacts", "CGM Groups", "Pending","Request" }; private List<String> menuItemList = Arrays.asList(menuItem); private int commonGroupPosition = 0; private String etAlertVal; private DatabaseHelper dbHelper; private int categoryID, listPos; /** New Code here.. */ private ArrayList<String> groupNames; private ArrayList<ArrayList<ChildItems>> childs; private UserMenuAdapter adapter; private Object object; private String[] data2 = { "PIN Michelle", "IP Call" }; private ListView mlist2; private ImageButton mimBtnMenu; private LinearLayout mllpopmenu; private View popupView; private PopupWindow popupWindow; private AlertDialog.Builder alert; private EditText input; private TextView mtvUserName, mtvUserTagLine; private ExpandableListView mExpandableListView; public static List<CategoryDataClass> categoryList; private boolean menuType = false; private String childValContact=""; public static Context context; @Override public void onBackPressed() { if (mllpopmenu.getVisibility() == View.VISIBLE) { mllpopmenu.setVisibility(View.INVISIBLE); } else { if (CCMStaticVariable.CommonConnection.isConnected()) { CCMStaticVariable.CommonConnection.disconnect(); } super.onBackPressed(); } } @SuppressWarnings("unchecked") @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_MENU) { if (mllpopmenu.getVisibility() == View.VISIBLE) { mllpopmenu.setVisibility(View.INVISIBLE); } else { if (commonGroupPosition >= 4 && menuType == true) { if(childValContact == ""){ mllpopmenu.setVisibility(View.VISIBLE); mlist2.setAdapter(new ArrayAdapter(UserMenuActivity.this, R.layout.listviewtext, R.id.tvMenuText, data_Contact)); }else{ mllpopmenu.setVisibility(View.VISIBLE); mlist2.setAdapter(new ArrayAdapter(UserMenuActivity.this, R.layout.listviewtext, R.id.tvMenuText, data_child_contact)); } } else if (commonGroupPosition == 0) { mllpopmenu.setVisibility(View.VISIBLE); mlist2.setAdapter(new ArrayAdapter(UserMenuActivity.this, R.layout.listviewtext, R.id.tvMenuText, data)); } } return true; } return super.onKeyDown(keyCode, event); } @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.usermenulayout); dbHelper = new DatabaseHelper(UserMenuActivity.this); //this.context = context.getApplicationContext(); XMPPConn.getContactList(); connection = CCMStaticVariable.CommonConnection; Presence userPresence = new Presence(Presence.Type.available); userPresence.setPriority(24); userPresence.setMode(Presence.Mode.away); connection.sendPacket(userPresence); } @Override protected void onResume() { super.onResume(); Presence userPresence = new Presence(Presence.Type.available); userPresence.setPriority(24); userPresence.setMode(Presence.Mode.away); connection.sendPacket(userPresence); XMPPConn.getContactList(); setExpandableListView(); } public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { if (groupPosition == 1 && childPosition == 0) { startActivity(new Intent(UserMenuActivity.this, InvitetoCCMActivity.class)); } else if (groupPosition == 1 && childPosition != 0) { Intent intent = new Intent(UserMenuActivity.this, UserChatActivity.class); intent.putExtra("userNameVal", XMPPConn.mfriendList.get(childPosition - 1).friendName); startActivity(intent); } else if (groupPosition == 2 && childPosition == 0) { startActivity(new Intent(UserMenuActivity.this, CreateGroupActivity.class)); } else if (groupPosition == 2 && childPosition != 0) { String GROUP_NAME = childs.get(groupPosition).get(childPosition) .getName().toString(); int end = GROUP_NAME.indexOf("("); CCMStaticVariable.groupName = GROUP_NAME.substring(0, end).trim(); startActivity(new Intent(UserMenuActivity.this, GroupsActivity.class)); } else if (groupPosition >= 4) { childValContact = childs.get(groupPosition).get(childPosition).getName().trim(); showToast("user==>"+childValContact, 0); } return false; } private void setExpandableListView() { /***###############GROUP ARRAY ############################*/ final ArrayList<String> groupNames = new ArrayList<String>(); groupNames.add("Chats (2)"); groupNames.add("Contacts (" + XMPPConn.mfriendList.size() + ")"); groupNames.add("CGM Groups (" + XMPPConn.mGroupList.size() + ")"); groupNames.add("Pending (1)"); XMPPConn.getGroup(); categoryList = dbHelper.getAllCategory(); /**Group From Sever*/ if (XMPPConn.mGroupList.size() > 0) { for (int g = 0; g < XMPPConn.mGroupList.size(); g++) { XMPPConn.getGroupContact(XMPPConn.mGroupList.get(g).groupName); groupNames.add(XMPPConn.mGroupList.get(g).groupName + "(" + XMPPConn.mGroupContactList.size()+ ")"); } } if(categoryList.size() > 0){ for (int cat = 0; cat < categoryList.size(); cat++) { groupNames.add(categoryList.get(cat).getCategoryName()+ "(0)"); } } this.groupNames = groupNames; /*** ###########CHILD ARRAY * #################*/ ArrayList<ArrayList<ChildItems>> childs = new ArrayList<ArrayList<ChildItems>>(); ArrayList<ChildItems> child = new ArrayList<ChildItems>(); child.add(new ChildItems("Alisha", "Hi",0)); child.add(new ChildItems("Michelle", "Good Morning",0)); childs.add(child); child = new ArrayList<ChildItems>(); child.add(new ChildItems("", "",0)); if (XMPPConn.mfriendList.size() > 0) { for (int n = 0; n < XMPPConn.mfriendList.size(); n++) { child.add(new ChildItems(XMPPConn.mfriendList.get(n).friendNickName, XMPPConn.mfriendList.get(n).friendStatus, XMPPConn.mfriendList.get(n).friendState)); } } childs.add(child); /************** CGM Group Child here *********************/ child = new ArrayList<ChildItems>(); child.add(new ChildItems("", "",0)); if (XMPPConn.mGroupList.size() > 0) { for (int grop = 0; grop < XMPPConn.mGroupList.size(); grop++) { child.add(new ChildItems( XMPPConn.mGroupList.get(grop).groupName + " (" + XMPPConn.mGroupList.get(grop).groupUserCount + ")", "",0)); } } childs.add(child); child = new ArrayList<ChildItems>(); child.add(new ChildItems("Shuchi", "Pending (Waiting for Authorization)",0)); childs.add(child); /************************ Group Contact List *************************/ if (XMPPConn.mGroupList.size() > 0) { for (int g = 0; g < XMPPConn.mGroupList.size(); g++) { /** Contact List */ XMPPConn.getGroupContact(XMPPConn.mGroupList.get(g).groupName); child = new ArrayList<ChildItems>(); for (int con = 0; con < XMPPConn.mGroupContactList.size(); con++) { child.add(new ChildItems( XMPPConn.mGroupContactList.get(con).friendName, XMPPConn.mGroupContactList.get(con).friendStatus,0)); } childs.add(child); } } if(categoryList.size() > 0){ for (int cat = 0; cat < categoryList.size(); cat++) { child = new ArrayList<ChildItems>(); child.add(new ChildItems("-none-", "",0)); childs.add(child); } } this.childs = childs; /** Set Adapter here */ adapter = new UserMenuAdapter(this, groupNames, childs); setListAdapter(adapter); object = this; mlist2 = (ListView) findViewById(R.id.list2); mimBtnMenu = (ImageButton) findViewById(R.id.imBtnMenu); mllpopmenu = (LinearLayout) findViewById(R.id.llpopmenu); mtvUserName = (TextView) findViewById(R.id.tvUserName); mtvUserTagLine = (TextView) findViewById(R.id.tvUserTagLine); //Set User name.. System.out.println("CCMStaticVariable.loginUserName===" + CCMStaticVariable.loginUserName); if (!CCMStaticVariable.loginUserName.equalsIgnoreCase("")) { mtvUserName.setText("" + CCMStaticVariable.loginUserName); } /** Expandable List set here.. */ mExpandableListView = (ExpandableListView) this .findViewById(android.R.id.list); mExpandableListView.setOnGroupClickListener(new OnGroupClickListener() { @Override public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) { XMPPConn.getContactList(); if (parent.isGroupExpanded(groupPosition)) { commonGroupPosition = 0; }else{ commonGroupPosition = groupPosition; } String GROUP_NAME = groupNames.get(groupPosition); int end = groupNames.get(groupPosition).indexOf("("); String GROUP_NAME_VALUE = GROUP_NAME.substring(0, end).trim(); if (menuItemList.contains(GROUP_NAME_VALUE)) { menuType = false; CCMStaticVariable.groupCatName = GROUP_NAME_VALUE; } else { menuType = true; CCMStaticVariable.groupCatName = GROUP_NAME_VALUE; } long findCatId = dbHelper.getCategoryID(GROUP_NAME_VALUE); if (findCatId != 0) { categoryID = (int) findCatId; } childValContact=""; showToast("Clicked on==" + GROUP_NAME_VALUE, 0); return false; } }); /** Click on item */ mlist2.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int pos,long arg3) { if (commonGroupPosition >= 4) { if(childValContact == ""){ if (pos == 0) { showAlertEdit(CCMStaticVariable.groupCatName); } /** Move contact to catgory */ if (pos == 1) { startActivity(new Intent(UserMenuActivity.this,AddContactCategoryActivity.class)); } }else{ if(pos == 0){ Intent intent = new Intent(UserMenuActivity.this,UserChatActivity.class); intent.putExtra("userNameVal",childValContact); startActivity(intent); } if(pos == 1){ XMPPConn.removeEntry(childValContact); showToast("Contact deleted sucessfully", 0); Intent intent = new Intent(UserMenuActivity.this,UserMenuActivity.class); } } } else { /** MyProfile */ if (pos == 0) { startActivity(new Intent(UserMenuActivity.this, MyProfileActivity.class)); } /** New multiperson chat start */ if (pos == 1) { startActivity(new Intent(UserMenuActivity.this, NewMultipersonChatActivity.class)); } /** New Broadcast message */ if (pos == 2) { startActivity(new Intent(UserMenuActivity.this, NewBroadcastMessageActivity.class)); } /** Click on add category */ if (pos == 3) { showAlertAdd(); } if (pos == 4) { startActivity(new Intent(UserMenuActivity.this, CreateGroupActivity.class)); } if (pos == 5) { startActivity(new Intent(UserMenuActivity.this, InvitetoCCMActivity.class)); } if (pos == 6) { startActivity(new Intent(UserMenuActivity.this, SearchActivity.class)); } if (pos == 7) { onGroupExpand(2); for (int i = 0; i < groupNames.size(); i++) { mExpandableListView.expandGroup(i); } } /** Click on settings */ if (pos == 8) { startActivity(new Intent(UserMenuActivity.this, SettingsActivity.class)); } if (pos == 10) { System.exit(0); } if (pos == 14) { if (mllpopmenu.getVisibility() == View.VISIBLE) { mllpopmenu.setVisibility(View.INVISIBLE); if (popupWindow.isShowing()) { popupWindow.dismiss(); } } else { mllpopmenu.setVisibility(View.VISIBLE); mlist2.setAdapter(new ArrayAdapter( UserMenuActivity.this, R.layout.listviewtext, R.id.tvMenuText, data)); } } } } }); } /** Toast message display here.. */ private void showToast(String msg, int time) { Toast.makeText(this, msg, time).show(); } public String showSubscriptionStatus(String friend){ return friend; } } Service.class public class UpdaterService extends Service { private XMPPConnection connection; String Friend; String user = ""; @Override public IBinder onBind(Intent arg0) { // TODO Auto-generated method stub return null; } @Override public void onCreate() { // Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show(); super.onCreate(); } @Override public void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); } @Override public void onStart(Intent intent, int startId) { // TODO Auto-generated method stub showToast("My Service Started", 0); connection = getConnection(); if (connection.isConnected()) { final Roster roster = connection.getRoster(); RosterListener r1 = new RosterListener() { @Override public void presenceChanged(Presence presence) { // TODO Auto-generated method stub XMPPConn.getContactList(); } @Override public void entriesUpdated(Collection<String> arg0) { // TODO Auto-generated method stub //notification("entriesUpdated"); } @Override public void entriesDeleted(Collection<String> arg0) { // TODO Auto-generated method stub //notification("entriesDeleted"); } @Override public void entriesAdded(Collection<String> arg0) { // TODO Auto-generated method stub Iterator<String> it = arg0.iterator(); if (it.hasNext()) { user = it.next(); } RosterEntry entry = roster.getEntry(user); if(entry.getType().toString().equalsIgnoreCase("to")){ int index_of_Alpha = Friend.indexOf("@"); String subID = Friend.substring(0, index_of_Alpha); notification("Hi "+subID+" wants to add you"); } } }; if (roster != null) { roster.setSubscriptionMode(Roster.SubscriptionMode.manual); System.out.println("subscription going on"); roster.addRosterListener(r1); } } else { showToast("Connection lost-", 0); } } protected void showToast(String msg, int time) { Toast.makeText(this, msg, time).show(); } private XMPPConnection getConnection() { return CCMStaticVariable.CommonConnection; } /** Notification manager */ private void notification(CharSequence message) { String ns = Context.NOTIFICATION_SERVICE; NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns); int icon = R.drawable.ic_launcher; CharSequence tickerText = message; long when = System.currentTimeMillis(); Notification notification = new Notification(icon, tickerText, when); Context context = getApplicationContext(); CharSequence contentTitle = "CCM"; CharSequence contentText = message; Intent notificationIntent = new Intent(this, ManageNotification.class); notificationIntent.putExtra("Subscriber_ID",user ); PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0); notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent); notification.flags |= Notification.FLAG_AUTO_CANCEL; final int HELLO_ID = 1; mNotificationManager.notify(HELLO_ID, notification); } } Here is my adapter class public class UserMenuAdapter extends BaseExpandableListAdapter { private ArrayList<String> groups; private ArrayList<ArrayList<ChildItems>> childs; private Context context; public LayoutInflater inflater; ImageView img_availabiliy; private static final int[] EMPTY_STATE_SET = {}; private static final int[] GROUP_EXPANDED_STATE_SET = {android.R.attr.state_expanded}; private static final int[][] GROUP_STATE_SETS = { EMPTY_STATE_SET, // 0 GROUP_EXPANDED_STATE_SET // 1 }; public UserMenuAdapter(Context context, ArrayList<String> groups, ArrayList<ArrayList<ChildItems>> childs) { this.context = context; this.groups = groups; this.childs = childs; inflater = LayoutInflater.from(context); } @Override public Object getChild(int groupPosition, int childPosition) { return childs.get(groupPosition).get(childPosition); } @Override public long getChildId(int groupPosition, int childPosition) { return (long) (groupPosition * 1024 + childPosition); } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { View v = null; if (convertView != null) v = convertView; else v = inflater.inflate(R.layout.child_layout, parent, false); ChildItems ci = (ChildItems) getChild(groupPosition, childPosition); TextView tv = (TextView) v.findViewById(R.id.tvChild); tv.setText(ci.getName()); TextView tv2 = (TextView) v.findViewById(R.id.tvChild2); tv2.setText(ci.getDailyStatus()); img_availabiliy = (ImageView)v.findViewById(R.id.img_childlayout_AVAILABILITY); ImageView friendPics = (ImageView)v.findViewById(R.id.ivFriendPics); if(ci.getStatusState() == 1){ img_availabiliy.setImageResource(R.drawable.online); } else if(ci.getStatusState()==0){ img_availabiliy.setImageResource(R.drawable.offline); } else if (ci.getStatusState()==2) { img_availabiliy.setImageResource(R.drawable.away); } else if(ci.getStatusState()==3){ img_availabiliy.setImageResource(R.drawable.busy); } else{ img_availabiliy.setImageDrawable(null); } if((groupPosition == 1 && childPosition == 0)){ friendPics.setImageResource(R.drawable.inviteto_ccm); img_availabiliy.setVisibility(View.INVISIBLE); } else if(groupPosition == 2 && childPosition == 0){ friendPics.setImageResource(R.drawable.new_ccmgroup); img_availabiliy.setVisibility(View.VISIBLE); }else{ if(ci.getPicture()!= null){ Bitmap bitmap = BitmapFactory.decodeByteArray(ci.getPicture(), 0, ci.getPicture().length); bitmap = Bitmap.createScaledBitmap(bitmap, 50, 50, true); friendPics.setImageBitmap(bitmap); }else{ friendPics.setImageResource(R.drawable.avatar); } img_availabiliy.setVisibility(View.VISIBLE); } return v; } @Override public int getChildrenCount(int groupPosition) { return childs.get(groupPosition).size(); } @Override public Object getGroup(int groupPosition) { return groups.get(groupPosition); } @Override public int getGroupCount() { return groups.size(); } @Override public long getGroupId(int groupPosition) { return (long) (groupPosition * 1024); } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { View v = null; if (convertView != null) v = convertView; else v = inflater.inflate(R.layout.group_layout, parent, false); String gt = (String) getGroup(groupPosition); TextView tv2 = (TextView) v.findViewById(R.id.tvGroup); if (gt != null) tv2.setText(gt); /**Set Image on group layout, Max/min*/ View ind = v.findViewById( R.id.explist_indicator); View groupInd = v.findViewById( R.id.llgroup); if( ind != null ) { ImageView indicator = (ImageView)ind; if( getChildrenCount( groupPosition ) == 0 ) { indicator.setVisibility( View.INVISIBLE ); } else { indicator.setVisibility( View.VISIBLE ); int stateSetIndex = ( isExpanded ? 1 : 0) ; Drawable drawable = indicator.getDrawable(); drawable.setState(GROUP_STATE_SETS[stateSetIndex]); } } if( groupInd != null ) { RelativeLayout indicator2 = (RelativeLayout)groupInd; if( getChildrenCount( groupPosition ) == 0 ) { indicator2.setVisibility( View.INVISIBLE ); } else { indicator2.setVisibility( View.VISIBLE ); int stateSetIndex = ( isExpanded ? 1 : 0) ; Drawable drawable2 = indicator2.getBackground(); drawable2.setState(GROUP_STATE_SETS[stateSetIndex]); } } return v; } @Override public boolean hasStableIds() { return true; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } public void onGroupCollapsed(int groupPosition) { } public void onGroupExpanded(int groupPosition) { } } I just want to update my list in ON PRESENCE CHANGED method in the Service class.. Please suggest me a means to do the same.

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• Dynamic Colorbox galleries using Ajax

  - by Gobitron

  Hi, I am new to jQuery / AJAX. I have a page that uses colorbox to display photo galleries. The page displays only one image from each gallery. When clicked, a colorbox opens up with all of the photos from that gallery. These inner photo references (for all photos from all galleries) are hidden on the page in an invisible div. The page is a PHP generated page. The galleries/photos are being populated via Picasa. All of the above works fine, but instead of loading all of the images from all galleries on page load (via PHP), I'd like to load only the requested gallery into the colorbox via AJAX. So far, I have a test page which can insert the proper links into a div on the page, but the Colorbox won't pick up on these links. This is where I need help. How can I get Colorbox to recognize the links generated by my AJAX call? The colorbox scripts sit in the header: <script type="text/javascript" src="libs/js/jquery.colorbox.js"></script> <script type="text/javascript"> //Writing out the ColorBox command for each album $(document).ready(function(){ <?php $setnum = 0; foreach ($albumIds as $albumId){ echo "\t\t\t$(\"a[rel='set" . $setnum . "']\").colorbox({maxWidth:\"640px\", maxHeight:\"480px\"});\n"; $setnum++; } ?> }); </script> Here is my get JSON code located in the body section of the page: $.getJSON("myserv.php",formContent, function(json){ var photos = json.data.items; var numpics = json.data.items.length; var pointer = 1; while (pointer < numpics){ var stuffineed = photos[pointer].media.image.url; $("#ajaxBox").append("<a href='" + stuffineed + "' rel='set" + pointer +"'>" + photos[pointer].media.image.url + "</a><br />"); pointer++; } }); //End json Again, I can get the AJAX to populate the div correctly, but the colorbox script isn't picking up these images. Any help would be greatly appreciated.

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• ProgressDialog not working in external AsyncTask

  - by eric

  I'm beginning to think that to get a ProgressDialog to work the AsyncTask has to be an inner class within an Activity class. True? I have an activity the uses a database to manipulate information. If the database is populated all is well. If it is not populated then I need to download information from a website, populate the database, then access the populated database to complete the Views in onCreate. Problem is without some means to determine when the AsyncTask thread has finished populating the database, I get the following Force Close error message: Sorry! The application has stopped unexpectedly. I click on the Force Close button, the background AsyncTask thread continues to work, the database gets populated, and everything works ok. I need to get rid of that error message and need some help on how to do this. Here's some psuedo code: public class ViewStuff extends Activity { onCreate { if(database is populated) do_stuff else { FillDB task = null; if(task == null || task.getStatus().equals(AsyncTask.Status.FINISHED)) { task = new FillDB(context); task.execute(null); } } continue with onCreate using information from database to properly display } // end onCreate } // end class In a separate file: public class FillDB extends AsyncTask<Void, Void, Void> { private Context context; public FillDB (Context c) //pass the context in the constructor { context = c; } public void filldb () { doInBackground(); } @Override protected void onPreExecute() { ProgressDialog progressDialog = new ProgressDialog(context); //crashes with the following line progressDialog.show(context, "Working..", "Retrieving info"); } @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub try etc etc etc } } What am I doing wrong?

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• Why is casting Derived** to Base*const* forbidden ?

  - by smerlin

  After reading this question, i saw the answer by Naveen containing a link to this page, which basically says, that casting from Derived** to Base** is forbidden since could change a pointer to an pointer to a Derived1 object point to a pointer to a Derived2 object (like: *derived1PtrPtr=derived2Ptr). OK, i understand this is evil ... But when casting Derived** to Base*const* this is not even possible, so whats the reason that this is not allowed anyway ?

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• Which casting technique is better for doing casting from upper class to lower class in C++

  - by Solitaire

  Hi all, i want to cast from upper class pointer to lower class i.e from the base class pointer to derived class pointer. Should i use "Dynamic_cast" or "reinterpret_cast"? please advice me

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• array retain question

  - by Cosizzle

  Hello, im fairly new to objective-c, most of it is clear however when it comes to memory managment I fall a little short. Currently what my application does is during a NSURLConnection when the method -(void)connectionDidFinishLoading:(NSURLConnection *)connection is called upon I enter a method to parse some data, put it into an array, and return that array. However I'm not sure if this is the best way to do so since I don't release the array from memory within the custom method (method1, see the attached code) Below is a small script to better show what im doing .h file #import <UIKit/UIKit.h> @interface memoryRetainTestViewController : UIViewController { NSArray *mainArray; } @property (nonatomic, retain) NSArray *mainArray; @end .m file #import "memoryRetainTestViewController.h" @implementation memoryRetainTestViewController @synthesize mainArray; // this would be the parsing method -(NSArray*)method1 { // ???: by not release this, is that bad. Or does it get released with mainArray NSArray *newArray = [[NSArray alloc] init]; newArray = [NSArray arrayWithObjects:@"apple",@"orange", @"grapes", "peach", nil]; return newArray; } // this method is actually // -(void)connectionDidFinishLoading:(NSURLConnection *)connection -(void)method2 { mainArray = [self method1]; } // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { mainArray = nil; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [mainArray release]; [super dealloc]; } @end

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• Linking errors when building against Boost Unit Test Framework

  - by Rafid

  I am trying to use Boost Unit Test Framework by building a stand alone library as detailed here: http://www.boost.org/doc/libs/1_35_0/libs/test/doc/components/utf/compilation.html So I created a VC library project containing the mentioned files and build it and it was successful. Then I created a test project and referenced the library project I just created, but when I tried to build it, I got the following linking errors: 1>Type.obj : error LNK2019: unresolved external symbol "bool __cdecl boost::test_tools::tt_detail::check_impl(class boost::test_tools::predicate_result const &,class boost::unit_test::lazy_ostream const &,class boost::unit_test::basic_cstring<char const >,unsigned __int64,enum boost::test_tools::tt_detail::tool_level,enum boost::test_tools::tt_detail::check_type,unsigned __int64,...)" (?check_impl@tt_detail@test_tools@boost@@YA_NAEBVpredicate_result@23@AEBVlazy_ostream@unit_test@3@V?$basic_cstring@$$CBD@63@_KW4tool_level@123@W4check_type@123@3ZZ) referenced in function "public: void __cdecl test1::test_method(void)" (?test_method@test1@@QEAAXXZ) 1>BoostUnitTestFramework.lib(framework.obj) : error LNK2019: unresolved external symbol "void __cdecl boost::debug::break_memory_alloc(long)" (?break_memory_alloc@debug@boost@@YAXJ@Z) referenced in function "void __cdecl boost::unit_test::framework::init(class boost::unit_test::test_suite * (__cdecl*)(int,char * * const),int,char * * const)" (?init@framework@unit_test@boost@@YAXP6APEAVtest_suite@23@HQEAPEAD@ZH0@Z) 1>BoostUnitTestFramework.lib(framework.obj) : error LNK2019: unresolved external symbol "void __cdecl boost::debug::detect_memory_leaks(bool)" (?detect_memory_leaks@debug@boost@@YAX_N@Z) referenced in function "void __cdecl boost::unit_test::framework::init(class boost::unit_test::test_suite * (__cdecl*)(int,char * * const),int,char * * const)" (?init@framework@unit_test@boost@@YAXP6APEAVtest_suite@23@HQEAPEAD@ZH0@Z) 1>BoostUnitTestFramework.lib(execution_monitor.obj) : error LNK2019: unresolved external symbol "bool __cdecl boost::debug::attach_debugger(bool)" (?attach_debugger@debug@boost@@YA_N_N@Z) referenced in function "public: int __cdecl boost::detail::system_signal_exception::operator()(unsigned int,struct _EXCEPTION_POINTERS *)" (??Rsystem_signal_exception@detail@boost@@QEAAHIPEAU_EXCEPTION_POINTERS@@@Z) 1>BoostUnitTestFramework.lib(execution_monitor.obj) : error LNK2019: unresolved external symbol "bool __cdecl boost::debug::under_debugger(void)" (?under_debugger@debug@boost@@YA_NXZ) referenced in function "public: int __cdecl boost::execution_monitor::execute(class boost::unit_test::callback0<int> const &)" (?execute@execution_monitor@boost@@QEAAHAEBV?$callback0@H@unit_test@2@@Z) 1>BoostUnitTestFramework.lib(unit_test_main.obj) : error LNK2019: unresolved external symbol "class boost::unit_test::test_suite * __cdecl init_unit_test_suite(int,char * * const)" (?init_unit_test_suite@@YAPEAVtest_suite@unit_test@boost@@HQEAPEAD@Z) referenced in function main 1>C:\Users\Rafid\Workspace\MyPhysics\Builds\VC10\Tests\Debug\Tests.exe : fatal error LNK1120: 6 unresolved externals They seem to be mainly caused by Boost debug library, but I can't see a reason why I should get linking errors putting in mind that Boost debug library only need to be included as header files, rather than linking against as a library! Any ideas?!

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• Handler invocation speed: Objective-C vs virtual functions

  - by Kerido

  I heard that calling a handler (delegate, etc.) in Objective-C can be even faster than calling a virtual function in C++. Is it really correct? If so, how can that be? AFAIK, virtual functions are not that slow to call. At least, this is my understanding of what happens when a virtual function is called: Compute the index of the function pointer location in vtbl. Obtain the pointer to vtbl. Dereference the pointer and obtain the beginning of the array of function pointers. Offset (in pointer scale) the beginning of the array with the index value obtained on step 1. Issue a call instruction. Unfortunately, I don't know Objective-C so it's hard for me to compare performance. But at least, the mechanism of a virtual function call doesn't look that slow, right? How can something other than static function call be faster?

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• How can I close a Window using the OS-X ScriptingBridge framework, from Perl?

  - by Gavin Brock

  Problem... Since MacPerl is no longer supported on 64bit perl, I am trying alternative frameworks to control Terminal.app. I am trying the ScriptingBridge, but have run into a problem passing an enumerated string to the closeSaving method using the PerlObjCBridge. I want to call: typedef enum { TerminalSaveOptionsYes = 'yes ' /* Save the file. */, TerminalSaveOptionsNo = 'no ' /* Do not save the file. */, TerminalSaveOptionsAsk = 'ask ' /* Ask the user whether or not to save the file. */ } TerminalSaveOptions; - (void) closeSaving:(TerminalSaveOptions)saving savingIn:(NSURL *)savingIn; // Close a document. Attempted Solution... I have tried: #!/usr/bin/perl use strict; use warnings; use Foundation; # Load the ScriptingBridge framework NSBundle->bundleWithPath_('/System/Library/Frameworks/ScriptingBridge.framework')->load; @SBApplication::ISA = qw(PerlObjCBridge); # Set up scripting bridge for Terminal.app my $terminal = SBApplication->applicationWithBundleIdentifier_("com.apple.terminal"); # Open a new window, get back the tab my $tab = $terminal->doScript_in_('exec sleep 60', undef); warn "Opened tty: ".$tab->tty->UTF8String; # Yes, it is a tab # Now try to close it # Simple idea eval { $tab->closeSaving_savingIn_('no ', undef) }; warn $@ if $@; # Try passing a string ref my $no = 'no '; eval { $tab->closeSaving_savingIn_(\$no, undef) }; warn $@ if $@; # Ok - get a pointer to the string my $pointer = pack("P4", $no); eval { $tab->closeSaving_savingIn_($pointer, undef) }; warn $@ if $@; eval { $tab->closeSaving_savingIn_(\$pointer, undef) }; warn $@ if $@; # Try a pointer decodes as an int, like PerlObjCBridge uses my $int_pointer = unpack("L!", $pointer); eval { $tab->closeSaving_savingIn_($int_pointer, undef) }; warn $@ if $@; eval { $tab->closeSaving_savingIn_(\$int_pointer, undef) }; warn $@ if $@; # Aaarrgghhhh.... As you can see, all my guesses at how to pass the enumerated string fail. Before you flame me... I know that I could use another language (ruby, python, cocoa) to do this but that would require translating the rest of the code. I might be able to use CamelBones, but I don't want to assume my users have it installed. I could also use the NSAppleScript framework (assuming I went to the trouble of finding the Tab and Window IDs) but it seems odd to have to resort to it for just this one call.

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• Problem with Flash...help

  - by aarontb

  Hey Guys...need help. Working on a project and get this error on the Output Log TypeError: Error #1009: Cannot access a property or method of a null object reference. at FlashSite_fla::MainTimeline/frame16() Here's every frame that is on, begins, or crosses frame 16 Layer Name: Top Menu (4 Button named Home_btn, Works_btn, Tech_btn, Contact_btn) Code attached to frame: stop(); Home_btn.addEventListener(MouseEvent.CLICK, home); function home(event:MouseEvent):void { gotoAndStop(16); } Works_btn.addEventListener(MouseEvent.CLICK, works); function works(event:MouseEvent):void { gotoAndStop(17); } Tech_btn.addEventListener(MouseEvent.CLICK, tech); function tech(event:MouseEvent):void { gotoAndStop(18); } Contacts_btn.addEventListener(MouseEvent.CLICK, contact); function contact(event:MouseEvent):void { gotoAndStop(19); } Layer Name: Investment Opp (button named Invest_btn) Code attached to frame: Invest_btn.addEventListener(MouseEvent.CLICK, invest); function invest(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: MfgOpp (Button named Mfg_btn) Code attached to frame: Mfg_btn.addEventListener(MouseEvent.CLICK, mfg); function mfg(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: MarketResearch (button name Own_btn) Code attached to frame: Own_btn.addEventListener(MouseEvent.CLICK, own); function own(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: ActionScript Code attached to frame: import flash.events.MouseEvent; What am I doing wrong?!?!

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• Hooking a Stacktrace in Delphi 2009

  - by Jim McKeeth

  The Exception class in Delphi 2009 received a number of new features. A number of them are related to getting a stacktrace: property StackTrace: string *read* GetStackTrace; property StackInfo: Pointer read FStackInfo; class var GetExceptionStackInfoProc: function (P: PExceptionRecord): Pointer; class var GetStackInfoStringProc: function (Info: Pointer): string; class var CleanUpStackInfoProc: procedure (Info: Pointer); Has anyone used these to obtain a stack trace yet? Yeah, I know there are other ways to get a stack trace, but if it is supported natively in the Exception class I would rather leverage that. Update: There is an interest blog post about this. Covers it in a lot of depth.

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• How can i do this using a Python Regex?

  - by uberjumper

  I am trying to properly extract methods definitions that are generated by comtypes for Com Interfaces using a regex. Furthermore some of them are blank which causes even more problems for me. Basically i have this: IXMLSerializerAlt._methods_ = [ COMMETHOD([helpstring(u'Loads an object from an XML string.')], HRESULT, 'LoadFromString', ( ['in'], BSTR, 'XML' ), ( ['in'], BSTR, 'TypeName' ), ( ['in'], BSTR, 'TypeNamespaceURI' ), ( ['retval', 'out'], POINTER(POINTER(IUnknown)), 'obj' )), ] class EnvironmentManager(CoClass): u'Singleton object that manages different environments (collections of configuration information).' _reg_clsid_ = GUID('{8A626D49-5F5E-47D9-9463-0B802E9C4167}') _idlflags_ = [] _typelib_path_ = typelib_path _reg_typelib_ = ('{5E1F7BC3-67C5-4AEE-8EC6-C4B73AAC42ED}', 1, 0) INumberFormat._methods_ = [ ] I want to extract both the IXMLSerializerAlt and INumberFormat methods definitions however i cant figure out a proper regex. E.g. for IXMLSerializer i want to extract this: IXMLSerializerAlt._methods_ = [ COMMETHOD([helpstring(u'Loads an object from an XML string.')], HRESULT, 'LoadFromString', ( ['in'], BSTR, 'XML' ), ( ['in'], BSTR, 'TypeName' ), ( ['in'], BSTR, 'TypeNamespaceURI' ), ( ['retval', 'out'], POINTER(POINTER(IUnknown)), 'obj' )), ] This regex in my mind this should work: ^\w+\._methods_\s=\s\[$ (^.+$)* ^]$ Im checking my regex's using kodos however i cannot figure out a way to make this work.

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• How to use Castle Windsor with ASP.Net web forms?

  - by Xian

  I am trying to wire up dependency injection with Windsor to standard asp.net web forms. I think I have achieved this using a HttpModule and a CustomAttribute (code shown below), although the solution seems a little clunky and was wondering if there is a better supported solution out of the box with Windsor? There are several files all shown together here // index.aspx.cs public partial class IndexPage : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Logger.Write("page loading"); } [Inject] public ILogger Logger { get; set; } } // WindsorHttpModule.cs public class WindsorHttpModule : IHttpModule { private HttpApplication _application; private IoCProvider _iocProvider; public void Init(HttpApplication context) { _application = context; _iocProvider = context as IoCProvider; if(_iocProvider == null) { throw new InvalidOperationException("Application must implement IoCProvider"); } _application.PreRequestHandlerExecute += InitiateWindsor; } private void InitiateWindsor(object sender, System.EventArgs e) { Page currentPage = _application.Context.CurrentHandler as Page; if(currentPage != null) { InjectPropertiesOn(currentPage); currentPage.InitComplete += delegate { InjectUserControls(currentPage); }; } } private void InjectUserControls(Control parent) { if(parent.Controls != null) { foreach (Control control in parent.Controls) { if(control is UserControl) { InjectPropertiesOn(control); } InjectUserControls(control); } } } private void InjectPropertiesOn(object currentPage) { PropertyInfo[] properties = currentPage.GetType().GetProperties(); foreach(PropertyInfo property in properties) { object[] attributes = property.GetCustomAttributes(typeof (InjectAttribute), false); if(attributes != null && attributes.Length > 0) { object valueToInject = _iocProvider.Container.Resolve(property.PropertyType); property.SetValue(currentPage, valueToInject, null); } } } } // Global.asax.cs public class Global : System.Web.HttpApplication, IoCProvider { private IWindsorContainer _container; public override void Init() { base.Init(); InitializeIoC(); } private void InitializeIoC() { _container = new WindsorContainer(); _container.AddComponent<ILogger, Logger>(); } public IWindsorContainer Container { get { return _container; } } } public interface IoCProvider { IWindsorContainer Container { get; } }

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• Lua Alien Module - Trouble using WriteProcessMemory function, unsure on types (unit32)

  - by jefferysanders

  require "alien" --the address im trying to edit in the Mahjong game on Win7 local SCOREREF = 0x0744D554 --this should give me full access to the process local ACCESS = 0x001F0FFF --this is my process ID for my open window of Mahjong local PID = 1136 --function to open proc local op = alien.Kernel32.OpenProcess op:types{ ret = "pointer", abi = "stdcall"; "int", "int", "int"} --function to write to proc mem local wm = alien.Kernel32.WriteProcessMemory wm:types{ ret = "long", abi = "stdcall"; "pointer", "pointer", "pointer", "long", "pointer" } local pRef = op(ACCESS, true, PID) local buf = alien.buffer("99") -- ptr,uint32,byte arr (no idea what to make this),int, ptr print( wm( pRef, SCOREREF, buf, 4, nil)) --prints 1 if success, 0 if failed So that is my code. I am not even sure if I have the types set correctly. I am completely lost and need some guidance. I really wish there was more online help/documentation for alien, it confuses my poor brain. What utterly baffles me is that it WriteProcessMemory will sometimes complete successfully (though it does nothing at all, to my knowledge) and will also sometimes fail to complete successfully. As I've stated, my brain hurts. Any help appreciated.

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• NSString copy not copying?

  - by Scotty Allen

  NSString *myString = @"sample string"; NSString *newString = [NSString stringWithString: myString]; If I set a breakpoint after these two lines, the pointer for myString is the same as the pointer for newString. WTF? Isn't NSString copy supposed to return a pointer to a new object? Or am I missing something fundamental about how copy is supposed to work?

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• Compiling GData for iPhone

  - by spin-docta

  Hi, I'm trying to compile a project that uses the GData objective-c framework. I've successfully compiled and run the project under the 'Debug' configuration, but when I try to compile using 'Release' and now 'Adhoc' I get the following errors. NOTE: I duplicated the debug configuration for adhoc and that doesn't seem to help. "_kGDataGoogleAnalyticsDefaultAccountFeed", referenced from: _kGDataGoogleAnalyticsDefaultAccountFeed$non_lazy_ptr in TKGoogleAnayliticsAPI.o ".objc_class_name_GDataFeedAnalyticsAccount", referenced from: literal-pointer@_OBJC@_cls_refs@GDataFeedAnalyticsAccount in TKGoogleAnayliticsAPI.o ".objc_class_name_GDataFeedAnalyticsData", referenced from: literal-pointer@_OBJC@_cls_refs@GDataFeedAnalyticsData in TKGoogleAnayliticsAPI.o ".objc_class_name_GDataQueryAnalytics", referenced from: literal-pointer@_OBJC@_cls_refs@GDataQueryAnalytics in TKGoogleAnayliticsAPI.o ".objc_class_name_GDataServiceGoogleAnalytics", referenced from: literal-pointer@_OBJC@_cls_refs@GDataServiceGoogleAnalytics in TKGoogleAnayliticsAPI.o ld: symbol(s) not found collect2: ld returned 1 exit status

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• Changing drag cursor in VirtualTreeView

  - by Coder12345

  When using VirtualTreeView drag operation by default is [doCopy,doMove]. Move operation is indicated by arrow pointer with small box and Copy operation is indicated by same pointer icon but with added [+] next to it. By default VT uses copy operation and if you press modifier key (SHIFT key) it modifies operation to move therefore removing the [+] from pointer. Here is what I need: reverse the operations (default would be move, with modifier key pressed - copy) and thus reverse pointer arrow too replace modifier key - CTRL instead of SHIFT read in an event which of the two operations occurred and start copy or move operation Any pointers into right direction(s) appreciated.

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