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• linking error in zxing while trying to use it in my project iphone

  - by Usman

  Hi, In My Project i need bar-code scanning. so i use zxing library but i m heaving some linking error and its getting me crazy. error is Undefined symbols: "zxing::BinaryBitmap::BinaryBitmap(zxing::Ref<zxing::Binarizer>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::GrayBytesMonochromeBitmapSource(unsigned char const*, int, int, int)in GrayBytesMonochromeBitmapSource.o "zxing::qrcode::QRCodeReader::decode(zxing::Ref<zxing::BinaryBitmap>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::~LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o "zxing::ReaderException::~ReaderException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::String::getText()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::LuminanceSource", referenced from: typeinfo for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "vtable for zxing::IllegalArgumentException", referenced from: __ZTVN5zxing24IllegalArgumentExceptionE$non_lazy_ptr in Decoder.o "typeinfo for zxing::ReaderException", referenced from: GCC_except_table1 in Decoder.o "vtable for zxing::Exception", referenced from: __ZTVN5zxing9ExceptionE$non_lazy_ptr in Decoder.o "zxing::LuminanceSource::copyMatrix()", referenced from: vtable for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "zxing::Result::getText()", referenced from: -[Decoder decode:] in Decoder.o "zxing::GlobalHistogramBinarizer::GlobalHistogramBinarizer(zxing::Ref<zxing::LuminanceSource>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::IllegalArgumentException::~IllegalArgumentException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::Result::getResultPoints()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::IllegalArgumentException", referenced from: GCC_except_table1 in Decoder.o "zxing::Exception::what() const", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "vtable for zxing::ReaderException", referenced from: __ZTVN5zxing15ReaderExceptionE$non_lazy_ptr in Decoder.o "zxing::qrcode::QRCodeReader::QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o "zxing::qrcode::QRCodeReader::~QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o ld: symbol(s) not found collect2: ld returned 1 exit status "zxing::BinaryBitmap::BinaryBitmap(zxing::Ref<zxing::Binarizer>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::GrayBytesMonochromeBitmapSource(unsigned char const*, int, int, int)in GrayBytesMonochromeBitmapSource.o "zxing::qrcode::QRCodeReader::decode(zxing::Ref<zxing::BinaryBitmap>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::LuminanceSource::~LuminanceSource()", referenced from: GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o GrayBytesMonochromeBitmapSource::~GrayBytesMonochromeBitmapSource()in GrayBytesMonochromeBitmapSource.o "zxing::ReaderException::~ReaderException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::String::getText()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::LuminanceSource", referenced from: typeinfo for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "vtable for zxing::IllegalArgumentException", referenced from: __ZTVN5zxing24IllegalArgumentExceptionE$non_lazy_ptr in Decoder.o "typeinfo for zxing::ReaderException", referenced from: GCC_except_table1 in Decoder.o "vtable for zxing::Exception", referenced from: __ZTVN5zxing9ExceptionE$non_lazy_ptr in Decoder.o "zxing::LuminanceSource::copyMatrix()", referenced from: vtable for GrayBytesMonochromeBitmapSourcein GrayBytesMonochromeBitmapSource.o "zxing::Result::getText()", referenced from: -[Decoder decode:] in Decoder.o "zxing::GlobalHistogramBinarizer::GlobalHistogramBinarizer(zxing::Ref<zxing::LuminanceSource>)", referenced from: -[Decoder decode:] in Decoder.o "zxing::IllegalArgumentException::~IllegalArgumentException()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "zxing::Result::getResultPoints()", referenced from: -[Decoder decode:] in Decoder.o "typeinfo for zxing::IllegalArgumentException", referenced from: GCC_except_table1 in Decoder.o "zxing::Exception::what() const", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o "vtable for zxing::ReaderException", referenced from: __ZTVN5zxing15ReaderExceptionE$non_lazy_ptr in Decoder.o "zxing::qrcode::QRCodeReader::QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o "zxing::qrcode::QRCodeReader::~QRCodeReader()", referenced from: -[Decoder decode:] in Decoder.o -[Decoder decode:] in Decoder.o ld: symbol(s) not found collect2: ld returned 1 exit status i m trying to resolve this for last two day. i think i m missing some library or some file. can any one point me out what i m doing wrong. Usman

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• Eclipse CDT code analysis thinks size_t is ambiguous

  - by Chris

  It does, after all, get defined in stddef.h AND c++config.h: c++config.h: namespace std { typedef __SIZE_TYPE__ size_t; typedef __PTRDIFF_TYPE__ ptrdiff_t; #ifdef __GXX_EXPERIMENTAL_CXX0X__ typedef decltype(nullptr) nullptr_t; #endif } stddef.h: #define __SIZE_TYPE__ long unsigned int So when a file does using namespace std, the Eclipse CDT code analysis gets confused and says the symbol is ambiguous. I don't know how gcc works around this, but does anybody have any suggestions on what to do for the eclipse code analysis?

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• Map a 32 bit float to a 32 bit integer

  - by zounds

  Is there a way to map floats to ints or unsigned ints so that with the exception of NaN, order is preserved? So if a and b are floats, and F is the mapping function, a < b implies F(a) < F(b) and a == b implies F(a) == F(b)

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• Reading off a socket until end of line C#?

  - by Omar Kooheji

  I'm trying to write a service that listens to a TCP Socket on a given port until an end of line is recived and then based on the "line" that was received executes a command. I've followed a basic socket programming tutorial for c# and have come up with the following code to listen to a socket: public void StartListening() { _log.Debug("Creating Maing TCP Listen Socket"); _mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipLocal = new IPEndPoint(IPAddress.Any, _port); _log.Debug("Binding to local IP Address"); _mainSocket.Bind(ipLocal); _log.DebugFormat("Listening to port {0}",_port); _mainSocket.Listen(10); _log.Debug("Creating Asynchronous callback for client connections"); _mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null); } public void OnClientConnect(IAsyncResult asyn) { try { _log.Debug("OnClientConnect Creating worker socket"); Socket workerSocket = _mainSocket.EndAccept(asyn); _log.Debug("Adding worker socket to list"); _workerSockets.Add(workerSocket); _log.Debug("Waiting For Data"); WaitForData(workerSocket); _log.DebugFormat("Clients Connected [{0}]", _workerSockets.Count); _mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null); } catch (ObjectDisposedException) { _log.Error("OnClientConnection: Socket has been closed\n"); } catch (SocketException se) { _log.Error("Socket Exception", se); } } public class SocketPacket { private System.Net.Sockets.Socket _currentSocket; public System.Net.Sockets.Socket CurrentSocket { get { return _currentSocket; } set { _currentSocket = value; } } private byte[] _dataBuffer = new byte[1]; public byte[] DataBuffer { get { return _dataBuffer; } set { _dataBuffer = value; } } } private void WaitForData(Socket workerSocket) { _log.Debug("Entering WaitForData"); try { lock (this) { if (_workerCallback == null) { _log.Debug("Initializing worker callback to OnDataRecieved"); _workerCallback = new AsyncCallback(OnDataRecieved); } } SocketPacket socketPacket = new SocketPacket(); socketPacket.CurrentSocket = workerSocket; workerSocket.BeginReceive(socketPacket.DataBuffer, 0, socketPacket.DataBuffer.Length, SocketFlags.None, _workerCallback, socketPacket); } catch (SocketException se) { _log.Error("Socket Exception", se); } } public void OnDataRecieved(IAsyncResult asyn) { SocketPacket socketData = (SocketPacket)asyn.AsyncState; try { int iRx = socketData.CurrentSocket.EndReceive(asyn); char[] chars = new char[iRx + 1]; _log.DebugFormat("Created Char array to hold incomming data. [{0}]",iRx+1); System.Text.Decoder decoder = System.Text.Encoding.UTF8.GetDecoder(); int charLength = decoder.GetChars(socketData.DataBuffer, 0, iRx, chars, 0); _log.DebugFormat("Read [{0}] characters",charLength); String data = new String(chars); _log.DebugFormat("Read in String \"{0}\"",data); WaitForData(socketData.CurrentSocket); } catch (ObjectDisposedException) { _log.Error("OnDataReceived: Socket has been closed. Removing Socket"); _workerSockets.Remove(socketData.CurrentSocket); } catch (SocketException se) { _log.Error("SocketException:",se); _workerSockets.Remove(socketData.CurrentSocket); } } This I thought was going to be a good basis for what I wanted to do, but the code I have appended the incoming characters to a text box one by one and didn't do anything with it. Which doesn't really work for what I want to do. My main issue is the decoupling of the OnDataReceived method from the Wait for data method. which means I'm having issues building a string (I would use a string builder but I can accept multiple connections so that doesn't really work. Ideally I'd like to look while listening to a socket until I see and end of line character and then call a method with the resulting string as a parameter. What's the best way to go about doing this.

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• using group_concat in PHPMYADMIN will show the result as [BLOB - 3B]

  - by Itay Moav

  I have a query which uses the GROUP_CONCAT of mysql on an integer field. I am using PHPMYADMIN to develop this query. My problem that instead of showing 1,2 which is the result of the concatenated field, I get [BLOB - 3B]. Query is SELECT rec_id,GROUP_CONCAT(user_id) FROM t1 GROUP BY rec_id (both fields are unsigned int, both are not unique) What should I add to see the actual results?

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• objective-c uncompress/inflate a NSData object which contains a gzipped string

  - by user141146

  Hi, I'm using objective-c (iPhone) to read a sqlite table that contains blob data. The blob data is actually a gzipped string. The blob data is read into memory as an NSData object I then use a method (gzipInflate) which I grabbed from here (http://www.cocoadev.com/index.pl?NSDataCategory) -- see method below. However, the gzipInflate method is returning nil. If I step through the gzipInflate method, I can see that the status returned near the bottom of the method is -3, which I assume is some type of error (Z_STREAM_END = 1 and Z_OK = 0, but I don't know precisely what a status of -3 is). Consequently, the function returns nil even though the input NSData is 841 bytes in length. Any thoughts on what I'm doing wrong? Is there something wrong with the method? Something wrong with how I'm using the method? Any thoughts on how to test this? Thanks for any help! - (NSData *)gzipInflate { // NSData *compressed_data = [self.description dataUsingEncoding: NSUTF16StringEncoding]; NSData *compressed_data = self.description; if ([compressed_data length] == 0) return compressed_data; unsigned full_length = [compressed_data length]; unsigned half_length = [compressed_data length] / 2; NSMutableData *decompressed = [NSMutableData dataWithLength: full_length + half_length]; BOOL done = NO; int status; z_stream strm; strm.next_in = (Bytef *)[compressed_data bytes]; strm.avail_in = [compressed_data length]; strm.total_out = 0; strm.zalloc = Z_NULL; strm.zfree = Z_NULL; if (inflateInit2(&strm, (15+32)) != Z_OK) return nil; while (!done) { // Make sure we have enough room and reset the lengths. if (strm.total_out >= [decompressed length]) [decompressed increaseLengthBy: half_length]; strm.next_out = [decompressed mutableBytes] + strm.total_out; strm.avail_out = [decompressed length] - strm.total_out; // Inflate another chunk. status = inflate (&strm, Z_SYNC_FLUSH); NSLog(@"zstreamend = %d", Z_STREAM_END); if (status == Z_STREAM_END) done = YES; else if (status != Z_OK) break; //status here actually is -3 } if (inflateEnd (&strm) != Z_OK) return nil; // Set real length. if (done) { [decompressed setLength: strm.total_out]; return [NSData dataWithData: decompressed]; } else return nil; }

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• How are integers casted to bytes in Java?

  - by helixed

  I know Java doesn't allow unsigned types, so I was wondering how it casts an integer to a byte. Say I have an integer a with a value of 255 and I cast the integer to a byte. Is the value represented in the byte 11111111? In other words, is the value treated more as a signed 8 bit integer, or does it just directly copy the last 8 bits of the integer? Thanks, helixed

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• PHP Doctrine frustration: loading models doesn't work..?

  - by ropstah

  I'm almost losing it, i really hope someone can help me out! I'm using Doctrine with CodeIgniter. Everything is setup correctly and works until I generate the classes and view the website. Fatal error: Class 'BaseObjecten' not found in /var/www/vhosts/domain.com/application/models/Objecten.php on line 13 I'm using the following bootstrapper (as CodeIgniter plugin): <?php // system/application/plugins/doctrine_pi.php // load Doctrine library require_once BASEPATH . '/plugins/Doctrine/lib/Doctrine.php'; // load database configuration from CodeIgniter require_once APPPATH.'/config/database.php'; // this will allow Doctrine to load Model classes automatically spl_autoload_register(array('Doctrine', 'autoload')); // we load our database connections into Doctrine_Manager // this loop allows us to use multiple connections later on foreach ($db as $connection_name => $db_values) { // first we must convert to dsn format $dsn = $db[$connection_name]['dbdriver'] . '://' . $db[$connection_name]['username'] . ':' . $db[$connection_name]['password']. '@' . $db[$connection_name]['hostname'] . '/' . $db[$connection_name]['database']; Doctrine_Manager::connection($dsn,$connection_name); } // CodeIgniter's Model class needs to be loaded require_once BASEPATH.'/libraries/Model.php'; // telling Doctrine where our models are located Doctrine::loadModels(APPPATH.'/models'); // (OPTIONAL) CONFIGURATION BELOW // this will allow us to use "mutators" Doctrine_Manager::getInstance()->setAttribute( Doctrine::ATTR_AUTO_ACCESSOR_OVERRIDE, true); // this sets all table columns to notnull and unsigned (for ints) by default Doctrine_Manager::getInstance()->setAttribute( Doctrine::ATTR_DEFAULT_COLUMN_OPTIONS, array('notnull' => true, 'unsigned' => true)); // set the default primary key to be named 'id', integer, 4 bytes Doctrine_Manager::getInstance()->setAttribute( Doctrine::ATTR_DEFAULT_IDENTIFIER_OPTIONS, array('name' => 'id', 'type' => 'integer', 'length' => 4)); ?> Anyone? p.s. I also tried adding the following right after // (OPTIONAL CONFIGURATION) Doctrine_Manager::getInstance()->setAttribute(Doctrine::ATTR_MODEL_LOADING, Doctrine::MODEL_LOADING_CONSERVATIVE); spl_autoload_register(array('Doctrine', 'modelsAutoload'));

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• C# datatypes vs. MySql datatypes

  - by Funky81

  Does anyone has the list of conversion from MySQL data types to C# data types ? I'm having difficulties when tried to convert from smallint unsigned type into c# type.

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• Convert Byte Array into Bitset

  - by Unknown

  I have a byte array generated by a random number generator. I want to put this into the STL bitset. Unfortunately, it looks like Bitset only supports the following constructors: A string of 1's and 0's like "10101011" An unsigned long. (my byte array will be longer) The only solution I can think of now is to read the byte array bit by bit and make a string of 1's and 0's. Does anyone have a more efficient solution?

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• Popping UIView crashes app

  - by Adun

  I'm basically pushing a UIView from a UITableViewController and all it contains is a UIWebView. However when I remove the UIView to return back to the UITableView the app crashes. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // Navigation logic may go here. Create and push another view controller. if (indexPath.row == websiteCell) { NSString *urlPath = [NSString stringWithFormat:@"http://%@", exhibitor.website]; WebViewController *webViewController = [[WebViewController alloc] initWithURLString:urlPath]; // Pass the selected object to the new view controller. [self.parentViewController presentModalViewController:webViewController animated:YES]; [webViewController release]; } } If I comment out the [webViewController release] the app doesn't crash, but I know that this would be a leak. Below is the code for the Web Browser: #import "WebViewController.h" @implementation WebViewController @synthesize webBrowserView; @synthesize urlValue; @synthesize toolBar; @synthesize spinner; @synthesize loadUrl; -(id)initWithURLString:(NSString *)urlString { if (self = [super init]) { urlValue = urlString; } return self; } #pragma mark WebView Controls - (void)goBack { [webBrowserView goBack]; } - (void)goForward { [webBrowserView goForward]; } - (void)reload { [webBrowserView reload]; } - (void)closeBrowser { [self.parentViewController dismissModalViewControllerAnimated:YES]; } #pragma end // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; CGRect contentRect = self.view.bounds; //NSLog(@"%f", contentRect.size.height); float webViewHeight = contentRect.size.height - 44.0f; // navBar = 44 float toolBarHeight = contentRect.size.height - webViewHeight; // navigation bar UINavigationBar *navBar = [[[UINavigationBar alloc] initWithFrame:CGRectMake(0, 20, contentRect.size.width, 44)] autorelease]; navBar.delegate = self; UIBarButtonItem *doneButton = [[[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:nil action:@selector(closeBrowser)] autorelease]; UINavigationItem *item = [[[UINavigationItem alloc] initWithTitle:@"CEDIA10"] autorelease]; item.leftBarButtonItem = doneButton; [navBar pushNavigationItem:item animated:NO]; [self.view addSubview:navBar]; // web browser webBrowserView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 64, contentRect.size.width, webViewHeight)]; webBrowserView.delegate = self; webBrowserView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; webBrowserView.scalesPageToFit = YES; [self.view addSubview:webBrowserView]; // buttons UIBarButtonItem *backButton = [[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"arrowleft.png"] style:UIBarButtonItemStylePlain target:self action:@selector(goBack)] autorelease]; UIBarButtonItem *fwdButton = [[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"arrowright.png"] style:UIBarButtonItemStylePlain target:self action:@selector(goForward)] autorelease]; UIBarButtonItem *refreshButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(reload)] autorelease]; UIBarButtonItem *flexSpace = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil] autorelease]; UIBarButtonItem *fixSpace = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil] autorelease]; [fixSpace setWidth: 40.0f]; spinner = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite] autorelease]; [spinner startAnimating]; UIBarButtonItem *loadingIcon = [[[UIBarButtonItem alloc] initWithCustomView:spinner] autorelease]; NSArray *toolBarButtons = [[NSArray alloc] initWithObjects: fixSpace, backButton, fixSpace, fwdButton, flexSpace, loadingIcon, flexSpace, refreshButton, nil]; // toolbar toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, webViewHeight, contentRect.size.width, toolBarHeight)]; toolBar.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth; toolBar.items = toolBarButtons; [self.view addSubview:toolBar]; // load the request NSURL *requestString = [NSURL URLWithString:urlValue]; [webBrowserView loadRequest:[NSURLRequest requestWithURL: requestString]]; [toolBarButtons release]; } - (void)viewWillDisappear { if ([webBrowserView isLoading]) { [webBrowserView stopLoading]; webBrowserView.delegate = nil; } } #pragma mark UIWebView - (void)webViewDidStartLoad:(UIWebView*)webView { [spinner startAnimating]; } - (void)webViewDidFinishLoad:(UIWebView*)webView { [spinner stopAnimating]; } - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { loadUrl = [[request URL] retain]; if ([[loadUrl scheme] isEqualToString: @"mailto"]) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"CEDIA10" message:@"Do you want to open Mail and exit AREC10?" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes",nil]; [alert show]; [alert release]; return NO; } [loadUrl release]; return YES; } - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error { [spinner stopAnimating]; if (error.code == -1009) { // no internet connection UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"CEDIA10" message:@"You need an active Internet connection." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; } } #pragma mark UIAlertView - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { if (buttonIndex == 1) { [[UIApplication sharedApplication] openURL:loadUrl]; [loadUrl release]; } } - (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. [webBrowserView release]; [urlValue release]; [toolBar release]; [spinner release]; [loadUrl release]; webBrowserView = nil; webBrowserView.delegate = nil; urlValue = nil; toolBar = nil; spinner = nil; loadUrl = nil; } - (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [webBrowserView release]; [urlValue release]; [toolBar release]; [spinner release]; [loadUrl release]; webBrowserView.delegate = nil; urlValue = nil; toolBar = nil; spinner = nil; loadUrl = nil; [super dealloc]; } @end Below this is the crash log that I am getting: Date/Time: 2010-05-13 11:58:20.023 +1000 OS Version: iPhone OS 3.1.3 (7E18) Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x00000000, 0x00000000 Crashed Thread: 0 Thread 0 Crashed: 0 libSystem.B.dylib 0x00090b2c __kill + 8 1 libSystem.B.dylib 0x00090b1a kill + 4 2 libSystem.B.dylib 0x00090b0e raise + 10 3 libSystem.B.dylib 0x000a7e34 abort + 36 4 libstdc++.6.dylib 0x00066390 __gnu_cxx::__verbose_terminate_handler() + 588 5 libobjc.A.dylib 0x00008898 _objc_terminate + 160 6 libstdc++.6.dylib 0x00063a84 __cxxabiv1::__terminate(void (*)()) + 76 7 libstdc++.6.dylib 0x00063afc std::terminate() + 16 8 libstdc++.6.dylib 0x00063c24 __cxa_throw + 100 9 libobjc.A.dylib 0x00006e54 objc_exception_throw + 104 10 CoreFoundation 0x00095bf6 -[NSObject doesNotRecognizeSelector:] + 106 11 CoreFoundation 0x0001ab12 ___forwarding___ + 474 12 CoreFoundation 0x00011838 _CF_forwarding_prep_0 + 40 13 QuartzCore 0x0000f448 CALayerCopyRenderLayer + 24 14 QuartzCore 0x0000f048 CA::Context::commit_layer(_CALayer*, unsigned int, unsigned int, void*) + 100 15 QuartzCore 0x0000ef34 CALayerCommitIfNeeded + 336 16 QuartzCore 0x0000eedc CALayerCommitIfNeeded + 248 17 QuartzCore 0x00011ee8 CA::Context::commit_root(void*, void*) + 52 18 QuartzCore 0x00011e80 x_hash_table_foreach + 64 19 QuartzCore 0x00011e2c CA::Transaction::foreach_root(void (*)(void*, void*), void*) + 40 20 QuartzCore 0x0000bb68 CA::Context::commit_transaction(CA::Transaction*) + 1068 21 QuartzCore 0x0000b46c CA::Transaction::commit() + 276 22 QuartzCore 0x000135d4 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 84 23 CoreFoundation 0x0000f82a __CFRunLoopDoObservers + 466 24 CoreFoundation 0x00057340 CFRunLoopRunSpecific + 1812 25 CoreFoundation 0x00056c18 CFRunLoopRunInMode + 44 26 GraphicsServices 0x000041c0 GSEventRunModal + 188 27 UIKit 0x00003c28 -[UIApplication _run] + 552 28 UIKit 0x00002228 UIApplicationMain + 960 29 CEDIA10 0x00002e16 main (main.m:14) 30 CEDIA10 0x00002db8 start + 32 Any ideas on why the app is crashing?

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• GCD and AppleEvents / NSOperationQueue and AppleScript

  - by mahal tertin

  As i understood, the threads provided by GCD do have a runloop but no source/port. Now i use some of methods that call AppleScripts thru AppleEvents inside an NSOperationQueue. And sometimes my app crashes with following stacktrace. my questions: Usage of AppleScript inside a NSInvocationOperation or NSBlockOperation Usage of AppleEvents inside GCD-Threads do i have to add a source / port to a runloop of a gcd-thread before using AppleEvents? do i have to add a source / port to a runloop of a gcd-thread before using [CATransaction commit]? do i have to add a source / port to a runloop of a gcd-thread before using [NSObject performSelectorAfterDelay...] ? if yes, how? can i simply call CFRunLoopRunInMode(kCFRunLoopDefaultMode, 5.0, false); /// or 30 or the defined timeout of appleevent? .. Thread 9: Dispatch queue: com.apple.root.default-priority 0 libSystem.B.dylib 0x00007fff88276e82 semaphore_wait_signal_trap 10 1 libSystem.B.dylib 0x00007fff8827c3cd pthread_mutex_lock 469 2 com.apple.applescript 0x000000011d3d461f AppleScriptComponent 50 3 com.apple.applescript 0x000000011d3edbcc AGenericCall::Delegate(ComponentInstanceRecord*) 46 4 com.apple.applescript 0x000000011d3ed520 AGenericManager::HandleOSACall(ComponentParameters*) 54 5 com.apple.applescript 0x000000011d3ed4b0 GenericComponent 219 6 com.apple.openscripting 0x00007fff8381c6da OSAExecuteEvent 63 7 com.apple.Foundation 0x00007fff86f320d8 -[NSAppleScript(NSPrivate) _executeAppleEvent:withMode:error:] 161 8 xxx 0x0000000100048af0 -[TCallScript callScript:withArrayOfParameters:] 480 9 xxx 0x0000000100048ffd -[TCallScript callHandler:withParameters:] 477 10 xxx 0x0000000100036032 -[ZFOpenWindowController getSafariItemForCurrentTabForWindow:] 66 11 xxx 0x00000001000346af -[ZFOpenWindowController refreshWindowList:] 1679 12 xxx 0x000000010003541c -[ZFOpenWindowController bringZFToForegroundZoomOut:orJustLinkFrontMost:toItem:] 2988 13 xxx 0x0000000100053556 __-[ZFSelectionTool openWithPreferredApplication:]_block_invoke_516 54 14 com.apple.Foundation 0x00007fff86ed87d9 -[NSBlockOperation main] 140 15 com.apple.Foundation 0x00007fff86ec906d -[__NSOperationInternal start] 681 16 com.apple.Foundation 0x00007fff86ec8d23 ____startOperations_block_invoke_2 99 17 libSystem.B.dylib 0x00007fff882b2ce8 _dispatch_call_block_and_release 15 18 libSystem.B.dylib 0x00007fff88291279 _dispatch_worker_thread2 231 19 libSystem.B.dylib 0x00007fff88290bb8 _pthread_wqthread 353 20 libSystem.B.dylib 0x00007fff88290a55 start_wqthread 13 ... Thread 11 Crashed: Dispatch queue: com.apple.root.default-priority 0 com.apple.applescript 0x000000011d40f658 BCHandleError() 182 1 com.apple.applescript 0x000000011d4059ca UASExecute1() 2546 2 com.apple.applescript 0x000000011d3dd1d5 ASExecuteEvent(AEDesc const*, unsigned int, int, unsigned int*) 695 3 ...ple.CoreServices.CarbonCore 0x00007fff85388e04 CallComponentFunction 28 4 com.apple.applescript 0x000000011d3d4cad AppleScriptComponent 1728 5 com.apple.applescript 0x000000011d3edbcc AGenericCall::Delegate(ComponentInstanceRecord*) 46 6 com.apple.applescript 0x000000011d3ed520 AGenericManager::HandleOSACall(ComponentParameters*) 54 7 com.apple.applescript 0x000000011d3ed4b0 GenericComponent 219 8 com.apple.openscripting 0x00007fff8381c6da OSAExecuteEvent 63 9 com.apple.Foundation 0x00007fff86f320d8 -[NSAppleScript(NSPrivate) _executeAppleEvent:withMode:error:] 161 10 xxx 0x0000000100048af0 -[TCallScript callScript:withArrayOfParameters:] 480 11 xxx 0x0000000100048ffd -[TCallScript callHandler:withParameters:] 477 12 xxx 0x0000000100035c67 -[ZFOpenWindowController getItemForAXDocumentOfFrontMostWindow] 119 13 xxx 0x00000001000359f1 -[ZFOpenWindowController getItemForFrontMostWindow:] 721 14 xxx 0x00000001000348ac -[ZFOpenWindowController bringZFToForegroundZoomOut:orJustLinkFrontMost:toItem:] 60 15 xxx 0x0000000100053556 __-[ZFSelectionTool openWithPreferredApplication:]_block_invoke_516 54 16 com.apple.Foundation 0x00007fff86ed87d9 -[NSBlockOperation main] 140 17 com.apple.Foundation 0x00007fff86ec906d -[__NSOperationInternal start] 681 18 com.apple.Foundation 0x00007fff86ec8d23 ____startOperations_block_invoke_2 99 19 libSystem.B.dylib 0x00007fff882b2ce8 _dispatch_call_block_and_release 15 20 libSystem.B.dylib 0x00007fff88291279 _dispatch_worker_thread2 231 21 libSystem.B.dylib 0x00007fff88290bb8 _pthread_wqthread 353 22 libSystem.B.dylib 0x00007fff88290a55 start_wqthread 13

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• How to send email with attachment through code + j2me+blackberry

  - by SWATI

  hey i am building an application in which user can send an email to a person. The user enters the email id of the person to whom email is to be sent in a Edit field and then presses a send button the email must be delivered with an attachment. how can i do it?????? i m really confused after googling. can someone tell me the exact way also,cant i send email from simulator if my cod file is unsigned thanks in advance

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• The best cross platform (portable) arbitrary precision math library

  - by Siu Ching Pong - Asuka Kenji

  Dear ninjas / hackers / wizards, I'm looking for a good arbitrary precision math library in C or C++. Could you please give me some advices / suggestions? The primary requirements: It MUST handle arbitrarily big integers (my primary interest is on integers). In case that you don't know what the word arbitrarily big means, imagine something like 100000! (the factorial of 100000). The precision MUST NOT NEED to be specified during library initialization / object creation. The precision should ONLY be constrained by the available resources of the system. It SHOULD utilize the full power of the platform, and should handle "small" numbers natively. That means on a 64-bit platform, calculating 2^33 + 2^32 should use the available 64-bit CPU instructions. The library SHOULD NOT calculate this in the same way as it does with 2^66 + 2^65 on the same platform. It MUST handle addition (+), subtraction (-), multiplication (*), integer division (/), remainder (%), power (**), increment (++), decrement (--), gcd(), factorial(), and other common integer arithmetic calculations efficiently. Ability to handle functions like sqrt() (square root), log() (logarithm) that do not produce integer results is a plus. Ability to handle symbolic computations is even better. Here are what I found so far: Java's BigInteger and BigDecimal class: I have been using these so far. I have read the source code, but I don't understand the math underneath. It may be based on theories / algorithms that I have never learnt. The built-in integer type or in core libraries of bc / Python / Ruby / Haskell / Lisp / Erlang / OCaml / PHP / some other languages: I have ever used some of these, but I have no idea on which library they are using, or which kind of implementation they are using. What I have already known: Using a char as a decimal digit, and a char* as a decimal string and do calculations on the digits using a for-loop. Using an int (or a long int, or a long long) as a basic "unit" and an array of it as an arbitrary long integer, and do calculations on the elements using a for-loop. Booth's multiplication algorithm What I don't know: Printing the binary array mentioned above in decimal without using naive methods. Example of a naive method: (1) add the bits from the lowest to the highest: 1, 2, 4, 8, 16, 32, ... (2) use a char* string mentioned above to store the intermediate decimal results). What I appreciate: Good comparisons on GMP, MPFR, decNumber (or other libraries that are good in your opinion). Good suggestions on books / articles that I should read. For example, an illustration with figures on how a un-naive arbitrarily long binary to decimal conversion algorithm works is good. Any help. Please DO NOT answer this question if: you think using a double (or a long double, or a long long double) can solve this problem easily. If you do think so, it means that you don't understand the issue under discussion. you have no experience on arbitrary precision mathematics. Thank you in advance! Asuka Kenji

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• emulator crashes

  - by Dave

  I am setting up an Android environment for the first time on Eclipse. I have many years of Eclipse experience, but new to Android. This is being done on an Apple Mac Mini, running MacOSX 10.6.3. I am using the latest Eclipse Classic, version 3.5.2. I am trying to get the tiny hello world program running. When I run it, I get the following in the console window of Eclipse: [2010-06-12 13:48:08 - HelloAndroid] Automatic Target Mode: launching new emulator with compatible AVD 'Android2.2AVD' [2010-06-12 13:48:08 - HelloAndroid] Launching a new emulator with Virtual Device 'Android2.2AVD' [2010-06-12 13:48:11 - HelloAndroid] New emulator found: emulator-5554 [2010-06-12 13:48:11 - HelloAndroid] Waiting for HOME ('android.process.acore') to be launched... [2010-06-12 13:48:12 - Emulator] 2010-06-12 13:48:12.783 emulator[50495:903] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz. [2010-06-12 13:48:19 - HelloAndroid] emulator-5554 disconnected! Cancelling 'com.example.helloandroid.HelloAndroid activity launch'! The emulator crashes with the following info. I have followed all the instructions for running the hello world sample. Anyone have any ideas? Process: emulator [50398] Path: /Users/jeremy/android-sdk-mac_86/tools/emulator Identifier: emulator Version: ??? (???) Code Type: X86 (Native) Parent Process: eclipse [50388] Date/Time: 2010-06-12 13:28:38.595 -0400 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6 Interval Since Last Report: 363037 sec Crashes Since Last Report: 9 Per-App Crashes Since Last Report: 7 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000000007fd000 Crashed Thread: 4 Thread 0: Dispatch queue: com.apple.main-thread 0 emulator 0x000eed4e helper_set_cp15 + 30 Thread 1: 0 libSystem.B.dylib 0x9020bbd2 __workq_kernreturn + 10 1 libSystem.B.dylib 0x9020c168 _pthread_wqthread + 941 2 libSystem.B.dylib 0x9020bd86 start_wqthread + 30 Thread 2: Dispatch queue: com.apple.libdispatch-manager 0 libSystem.B.dylib 0x9020cb42 kevent + 10 1 libSystem.B.dylib 0x9020d25c _dispatch_mgr_invoke + 215 2 libSystem.B.dylib 0x9020c719 _dispatch_queue_invoke + 163 3 libSystem.B.dylib 0x9020c4be _dispatch_worker_thread2 + 240 4 libSystem.B.dylib 0x9020bf41 _pthread_wqthread + 390 5 libSystem.B.dylib 0x9020bd86 start_wqthread + 30 Thread 3: 0 libSystem.B.dylib 0x901e635a semaphore_timedwait_signal_trap + 10 1 libSystem.B.dylib 0x90213ea1 _pthread_cond_wait + 1066 2 libSystem.B.dylib 0x90242a28 pthread_cond_timedwait_relative_np + 47 3 com.apple.audio.CoreAudio 0x9056f965 CAGuard::WaitFor(unsigned long long) + 219 4 com.apple.audio.CoreAudio 0x90572997 CAGuard::WaitUntil(unsigned long long) + 289 5 com.apple.audio.CoreAudio 0x90570294 HP_IOThread::WorkLoop() + 1892 6 com.apple.audio.CoreAudio 0x9056fb2b HP_IOThread::ThreadEntry(HP_IOThread*) + 17 7 com.apple.audio.CoreAudio 0x9056fa42 CAPThread::Entry(CAPThread*) + 140 8 libSystem.B.dylib 0x90213a19 _pthread_start + 345 9 libSystem.B.dylib 0x9021389e thread_start + 34 Thread 4 Crashed: 0 emulator 0x00040380 audioInDeviceIOProc + 96 Thread 4 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x007fd000 ecx: 0x000001fe edx: 0x0198f3f0 edi: 0x00000200 esi: 0x01119850 ebp: 0x01119800 esp: 0xb020fad0 ss: 0x0000001f efl: 0x00010212 eip: 0x00040380 cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037 cr2: 0x007fd000

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• Floating point vs integer calculations on modern hardware

  - by maxpenguin

  I am doing some performance critical work in C++, and we are currently using integer calculations for problems that are inherently floating point because "its faster". This causes a whole lot of annoying problems and adds a lot of annoying code. Now, I remember reading about how floating point calculations were so slow approximately circa the 386 days, where I believe (IIRC) that there was an optional co-proccessor. But surely nowadays with exponentially more complex and powerful CPUs it makes no difference in "speed" if doing floating point or integer calculation? Especially since the actual calculation time is tiny compared to something like causing a pipeline stall or fetching something from main memory? I know the correct answer is to benchmark on the target hardware, what would be a good way to test this? I wrote two tiny C++ programs and compared their run time with "time" on Linux, but the actual run time is too variable (doesn't help I am running on a virtual server). Short of spending my entire day running hundreds of benchmarks, making graphs etc. is there something I can do to get a reasonable test of the relative speed? Any ideas or thoughts? Am I completely wrong? The programs I used as follows, they are not identical by any means: #include <iostream> #include <cmath> #include <cstdlib> #include <time.h> int main( int argc, char** argv ) { int accum = 0; srand( time( NULL ) ); for( unsigned int i = 0; i < 100000000; ++i ) { accum += rand( ) % 365; } std::cout << accum << std::endl; return 0; } Program 2: #include <iostream> #include <cmath> #include <cstdlib> #include <time.h> int main( int argc, char** argv ) { float accum = 0; srand( time( NULL ) ); for( unsigned int i = 0; i < 100000000; ++i ) { accum += (float)( rand( ) % 365 ); } std::cout << accum << std::endl; return 0; } Thanks in advance!

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• C++/STL: std::transform with given stride?

  - by Arman

  Hello, I have a 1d array containing Nd data, I would like to effectively traverse on it with std::transform or std::for_each. unigned int nelems; unsigned int stride=3;// we are going to have 3D points float *pP;// this will keep xyzxyzxyz... Load(pP); std::transform(pP, pP+nelems, strMover<float>(pP, stride));//How to define the strMover?? Kind Regards, Arman.

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• read a file with both text and binary information in .Net

  - by Yin Zhu

  I need to read binary PGM image files. Its format: P5 # comments nrows ncolumns max-value binary values start at this line. (totally nrows*ncolumns bytes/unsigned char) I know how to do it in C or C++ using FILE handler by reading several lines first and read the binary block. But don't know how to do it in .Net.

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• Are "EXC_BREAKPOINT (SIGTRAP)" exceptions caused by debugging breakpoints?

  - by Dennis

  I have a multithreaded app that is very stable on all my test machines and seems to be stable for almost every one of my users (based on no complaints of crashes). The app crashes frequently for one user, though, who was kind enough to send crash reports. All the crash reports (~10 consecutive reports) look essentially identical: Date/Time: 2010-04-06 11:44:56.106 -0700 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6 Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000002, 0x0000000000000000 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 com.apple.CoreFoundation 0x90ab98d4 __CFBasicHashRehash + 3348 1 com.apple.CoreFoundation 0x90adf610 CFBasicHashRemoveValue + 1264 2 com.apple.CoreText 0x94e0069c TCFMutableSet::Intersect(__CFSet const*) const + 126 3 com.apple.CoreText 0x94dfe465 TDescriptorSource::CopyMandatoryMatchableRequest(__CFDictionary const*, __CFSet const*) + 115 4 com.apple.CoreText 0x94dfdda6 TDescriptorSource::CopyDescriptorsForRequest(__CFDictionary const*, __CFSet const*, long (*)(void const*, void const*, void*), void*, unsigned long) const + 40 5 com.apple.CoreText 0x94e00377 TDescriptor::CreateMatchingDescriptors(__CFSet const*, unsigned long) const + 135 6 com.apple.AppKit 0x961f5952 __NSFontFactoryWithName + 904 7 com.apple.AppKit 0x961f54f0 +[NSFont fontWithName:size:] + 39 (....more text follows) First, I spent a long time investigating [NSFont fontWithName:size:]. I figured that maybe the user's fonts were screwed up somehow, so that [NSFont fontWithName:size:] was requesting something non-existent and failing for that reason. I added a bunch of code using [[NSFontManager sharedFontManager] availableFontNamesWithTraits:NSItalicFontMask] to check for font availability in advance. Sadly, these changes didn't fix the problem. I've now noticed that I forgot to remove some debugging breakpoints, including _NSLockError, [NSException raise], and objc_exception_throw. However, the app was definitely built using "Release" as the active build configuration. I assume that using the "Release" configuration prevents setting of any breakpoints--but then again I am not sure exactly how breakpoints work or whether the program needs to be run from within gdb for breakpoints to have any effect. My questions are: could my having left the breakpoints set be the cause of the crashes observed by the user? If so, why would the breakpoints cause a problem only for this one user? If not, has anybody else had similar problems with [NSFont fontWithName:size:]? I will probably just try removing the breakpoints and sending back to the user, but I'm not sure how much currency I have left with that user. And I'd like to understand more generally whether leaving the breakpoints set could possibly cause a problem (when the app is built using "Release" configuration).

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• Can you Download the cmid.ctt File

  - by ArtistDigital

  Can you Download the cmid.ctt File Zong.com.pk http://203.82.55.30/websms/default.aspx?txt_Msg=your-name&txt_MNumber=033489667417&txt_Nick=your-name Still Waiting for Reply.... kindly more Developer to broke the Server expection function alphanumeric(alphane) { var numaric = alphane; for(var j=0; j 47 && hh<59) || (hh 64 && hh<91) || (hh 96 && hh<123)) { } else { return false; } } return true; } function charscount(msg, frm) { frm.num_chars.value = 147 - msg.length; // m = msg; } function moveDivDown() { var el = document.getElementById("chatwindow") st = el.scrollTop; el.scrollTop = el.scrollTop + 300 } function trim(str) { return str.replace(/^\s*|\s*$/g,""); } var XMLHttp; var XMLHttp2; /SEND TO SERVER/ function GetXmlHttpObject() { var objXMLHttp=null /* if (window.XMLHttpRequest) { objXMLHttp=new XMLHttpRequest() } else if (window.ActiveXObject) { objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP") }*/ var ua = navigator.userAgent.toLowerCase(); if (!window.ActiveXObject) objXMLHttp = new XMLHttpRequest(); else if (ua.indexOf('msie 5') == -1) objXMLHttp = new ActiveXObject("Msxml2.XMLHTTP"); else objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP"); return objXMLHttp } function updateChatWindow() { var txt_Msg, txt_mNumber, txt_Nick, myMessage txt_MNumber = document.getElementById("txt_MNumber").value txt_Msg = document.getElementById("txt_Msg").value txt_Nick = document.getElementById("txt_Nick").value txt_Nick = trim (txt_Nick) if (txt_Nick.length==0) { alert ("Please enter the Nick Name") document.getElementById("txt_Nick").focus() document.getElementById("txt_Nick").value="" return false; } if (!alphanumeric(txt_Nick)) { alert ("Please enter a valid alphanumeric Nick Name") document.getElementById("txt_Nick").value="" document.getElementById("txt_Nick").focus() return false; } if (txt_Msg.length==0) return false; if (txt_MNumber.length != 10) { alert ("Please Enter a 10 digit recipient mobile number") return false } if (!IsNumeric (txt_MNumber)) { alert ("Please Enter a valid 10 digit recipient mobile number") return false } document.getElementById("txt_Msg").value = "" document.getElementById("num_chars").value = "147" document.getElementById("txt_Msg").focus() myMessage = '' +txt_Nick + ' Says: ' + txt_Msg + '' document.getElementById("chatwindow").innerHTML= document.getElementById("chatwindow").innerHTML + myMessage moveDivDown() XMLHttp = GetXmlHttpObject() if (XMLHttp==null) { alert ("Browser does not support HTTP Request") return false; } var url="default.aspx?" url=url+"txt_Msg="+txt_Msg url=url+"&txt_MNumber="+txt_MNumber url=url+"&txt_Nick="+txt_Nick url=url+"&sid="+Math.random() XMLHttp.onreadystatechange=stateChanged XMLHttp.open("GET",url,true) XMLHttp.send(null) return false; } function stateChanged() { if (XMLHttp.readyState==4 || XMLHttp.readyState=="complete") { try { document.getElementById("chatwindow").innerHTML= document.getElementById("chatwindow").innerHTML+ XMLHttp.responseText moveDivDown() } catch (e){} } } /RECEIVE FROM SERVER/ function checkResponse() { XMLHttp2 = GetXmlHttpObject() if (XMLHttp2==null) { alert ("Browser does not support HTTP Request") return } var url="" url=url+"?r=C" url=url+"&sid="+Math.random() XMLHttp2.onreadystatechange=stateChanged2 XMLHttp2.open("GET",url,true) XMLHttp2.send(null) } function stateChanged2() { if (XMLHttp2.readyState==4 || XMLHttp2.readyState=="complete") { try { document.getElementById("chatwindow").innerHTML= document.getElementById("chatwindow").innerHTML + XMLHttp2.responseText moveDivDown() } catch (e){} //Again Check Updates after 3 Seconds setTimeout("checkResponse()", 2000); } } function IsNumeric(sText) { var ValidChars = "0123456789"; var IsNumber=true; var Char; for (i = 0; i < sText.length && IsNumber == true; i++) { Char = sText.charAt(i); if (ValidChars.indexOf(Char) == -1) { IsNumber = false; } } return IsNumber; }

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• Uses of a C++ Arithmetic Promotion Header

  - by OlduvaiHand

  I've been playing around with a set of templates for determining the correct promotion type given two primitive types in C++. The idea is that if you define a custom numeric template, you could use these to determine the return type of, say, the operator+ function based on the class passed to the templates. For example: // Custom numeric class template <class T> struct Complex { Complex(T real, T imag) : r(real), i(imag) {} T r, i; // Other implementation stuff }; // Generic arithmetic promotion template template <class T, class U> struct ArithmeticPromotion { typedef typename X type; // I realize this is incorrect, but the point is it would // figure out what X would be via trait testing, etc }; // Specialization of arithmetic promotion template template <> class ArithmeticPromotion<long long, unsigned long> { typedef typename unsigned long long type; } // Arithmetic promotion template actually being used template <class T, class U> Complex<typename ArithmeticPromotion<T, U>::type> operator+ (Complex<T>& lhs, Complex<U>& rhs) { return Complex<typename ArithmeticPromotion<T, U>::type>(lhs.r + rhs.r, lhs.i + rhs.i); } If you use these promotion templates, you can more or less treat your user defined types as if they're primitives with the same promotion rules being applied to them. So, I guess the question I have is would this be something that could be useful? And if so, what sorts of common tasks would you want templated out for ease of use? I'm working on the assumption that just having the promotion templates alone would be insufficient for practical adoption. Incidentally, Boost has something similar in its math/tools/promotion header, but it's really more for getting values ready to be passed to the standard C math functions (that expect either 2 ints or 2 doubles) and bypasses all of the integral types. Is something that simple preferable to having complete control over how your objects are being converted? TL;DR: What sorts of helper templates would you expect to find in an arithmetic promotion header beyond the machinery that does the promotion itself?

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• Serial port : Read data problem, not reading complete data

  - by Anuj Mehta

  Hi I have an application where I am sending data via serial port from PC1 (Java App) and reading that data in PC2 (C++ App). The problem that I am facing is that my PC2 (C++ App) is not able to read complete data sent by PC1 i.e. from my PC1 I am sending 190 bytes but PC2 is able to read close to 140 bytes though I am trying to read in a loop. Below is code snippet of my C++ App Open the connection to serial port serialfd = open( serialPortName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY); if (serialfd == -1) { /* * Could not open the port. */ TRACE << "Unable to open port: " << serialPortName << endl; } else { TRACE << "Connected to serial port: " << serialPortName << endl; fcntl(serialfd, F_SETFL, 0); } Configure the Serial Port parameters struct termios options; /* * Get the current options for the port... */ tcgetattr(serialfd, &options); /* * Set the baud rates to 9600... */ cfsetispeed(&options, B38400); cfsetospeed(&options, B38400); /* * 8N1 * Data bits - 8 * Parity - None * Stop bits - 1 */ options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB; options.c_cflag &= ~CSIZE; options.c_cflag |= CS8; /* * Enable hardware flow control */ options.c_cflag |= CRTSCTS; /* * Enable the receiver and set local mode... */ options.c_cflag |= (CLOCAL | CREAD); // Flush the earlier data tcflush(serialfd, TCIFLUSH); /* * Set the new options for the port... */ tcsetattr(serialfd, TCSANOW, &options); Now I am reading data const int MAXDATASIZE = 512; std::vector<char> m_vRequestBuf; char buffer[MAXDATASIZE]; int totalBytes = 0; fcntl(serialfd, F_SETFL, FNDELAY); while(1) { bytesRead = read(serialfd, &buffer, MAXDATASIZE); if(bytesRead == -1) { //Sleep for some time and read again usleep(900000); } else { totalBytes += bytesRead; //Add data read to vector for(int i =0; i < bytesRead; i++) { m_vRequestBuf.push_back(buffer[i]); } int newBytesRead = 0; //Now keep trying to read more data while(newBytesRead != -1) { //clear contents of buffer memset((void*)&buffer, 0, sizeof(char) * MAXDATASIZE); newBytesRead = read(serialfd, &buffer, MAXDATASIZE); totalBytes += newBytesRead; for(int j = 0; j < newBytesRead; j++) { m_vRequestBuf.push_back(buffer[j]); } }//inner while break; } //while

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• C++ arithmetic with pointers

  - by user69514

  I am trying to add the following: I have an array of double pointers call A. I have another array of double pointers call it B, and I have an unsigned int call it C. So I want to do: A[i] = B[i] - C; how do I do it? I did: A[i] = &B[i] - C; I don't think I am doing this correctly.

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• Issue with angular gradient algorithm

  - by user146780

  I have an angular gradient algorithm: GLuint OGLENGINEFUNCTIONS::CreateAngularGradient( std::vector<ARGBCOLORF> &input,POINTFLOAT start, POINTFLOAT end, int width, int height ) { std::vector<GLubyte> pdata(width * height * 4); float pi = 3.1415; float cx; float cy; float r1; float r2; float ang; float px; float py; float t; cx = start.x; cy = start.y; r1 = 0; r2 = 500; ang = end.x / 100; ARGBCOLORF color; for (unsigned int i = 0; i < height; i++) { for (unsigned int j = 0; j < width; j++) { px = j; py = i; if( px * px + py * py <= r2 * r2 && px * px + py * py >= r1 * r1 ) { t= atan2(py-cy,px-cx) + ang; t= t+ pi; if (t > 2* pi) { t=t-2*pi; t=t/(2*pi); } } //end + start color.r = (0 * t) + (120 * (1 - t)); color.g = (50 * t) + (255 * (1 - t)); color.b = (0 * t) + (50 * (1 - t)); color.a = (255 * t) + (200 * (1 - t)); pdata[i * 4 * width + j * 4 + 0] = (GLubyte) color.r; pdata[i * 4 * width + j * 4 + 1] = (GLubyte) color.g; pdata[i * 4 * width + j * 4 + 2] = (GLubyte) 12; pdata[i * 4 * width + j * 4 + 3] = (GLubyte) 255; } } It works fine except the ang variable only controls the end sweep, not the start sweep. The start sweep is always facing the middle left as seen here: http://img810.imageshack.us/img810/9623/uhoh.png Basically I have no control over the end one going this <- way. How could I control this one? Thanks

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• 2D polygon triangulation

  - by logank9

  The code below is my attempt at triangulation. It outputs the wrong angles (it read a square's angles as 90, 90. 90, 176) and draws the wrong shapes. What am I doing wrong? //use earclipping to generate a list of triangles to draw std::vector<vec> calcTriDraw(std::vector<vec> poly) { std::vector<double> polyAngles; //get angles for(unsigned int i = 0;i < poly.size();i++) { int p1 = i - 1; int p2 = i; int p3 = i + 1; if(p3 > int(poly.size())) p3 -= poly.size(); if(p1 < 0) p1 += poly.size(); //get the angle from 3 points double dx, dy; dx = poly[p2].x - poly[p1].x; dy = poly[p2].y - poly[p1].y; double a = atan2(dy,dx); dx = poly[p3].x - poly[p2].x; dy = poly[p3].y - poly[p2].y; double b = atan2(dy,dx); polyAngles.push_back((a-b)*180/PI); } std::vector<vec> triList; for(unsigned int i = 0;i < poly.size() && poly.size() > 2;i++) { int p1 = i - 1; int p2 = i; int p3 = i + 1; if(p3 > int(poly.size())) p3 -= poly.size(); if(p1 < 0) p1 += poly.size(); if(polyAngles[p2] >= 180) { continue; } else { triList.push_back(poly[p1]); triList.push_back(poly[p2]); triList.push_back(poly[p3]); poly.erase(poly.begin()+p2); std::vector<vec> add = calcTriDraw(poly); triList.insert(triList.end(), add.begin(), add.end()); break; } } return triList; }

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