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  • iphone memory leaks and malloc?

    - by Brodie4598
    Okay so im finally to the point where I am testing my iPad App on an actual iPad... One thing that my app does is display a large (2mb) image in a scroll view. This is causing the iPad to get memory warnings. I run the app in the instruments to check for the leak. When I load the image, a leak is detected and i see the following in the allocations: ALl Allocations: 83.9 MB Malloc 48.55 MB: 48.55 MB Malloc 34.63 MB: 34.63 MB What im trying to understand is how to plug the leak obviously, but also why a 2MB image is causing a malloc of 20x that size I am very new to programming in obj-c so im sure this is an obvious thing, but I just cant figure it out. Here is the code:

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  • NSZombieEnabled hides EXC_BAD_ACCESS error entirely

    - by David Liu
    So I have a subclass of a UIView that starts causing EXC_BAD_ACCESS errors when I go through a specific set of conditions (run on iPad instead of iPhone or simulator, first login only). It throws the exception when the UIView subclass gets deallocated, during the last line, where I have [super dealloc]. I heard about using NSZombieEnabled, so I tossed that on to see if I could get any more information about it, but now it hides the error completely! Does anyone know a bit more about this type of situation? I thought NSZombie would start spewing stuff into my console like before, but I'm hoping that the nonexistance of errors would tell me some sort of information as well.

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  • Does different iVar name change retain count when used with property

    - by russell
    Here is 2 code snapshot- Class A:NSObject { NSMutableArray *a; } @property (retain) NSMutableArray *a; @implementation @synthesize a; -(id)init { if(self=[super init]) { a=[[NSMutableArray alloc] init]; } } @end Class A:NSObject { NSMutableArray *_a; } @property (retain) NSMutableArray *a; @implementation @synthesize a=_a; -(id)init { if(self=[super init]) { _a=[[NSMutableArray alloc] init]; } } @end Now what i need to know, is in both code instance variable assigned value directly rather than using accessor and retain count is 1? Or there is difference between them. Thanks. And one more things, apple recommended not to use accessor in init/dealloc, but at the same time ask not to directly set iVar. So what is the best way to assign value of ivar in init()??

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  • One off errors with NSLog and NSString stringWithFormat

    - by David Liu
    Does anyone know why there would be one-off errors with NSLog and NSString? It works fine in 99% of my program, but for some reason this error appears in one of my model's description method: Example code: localFileId = 7; type = 2; localId = 5; NSLog(@"CachedFile localId=%d, 2=%d, localFileId=%d, type=%d, path=%@", localId, 2, localFileId, type, self.path); Example Result: CachedFile localId=5, 2=0, localFileId=2, type=7, path=(null) Notice the "0" that gets inserted in there, where it should be "2=2". This happens with NSString stringWithFormat as well.

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  • How to make a big switch control structure with variable check values?

    - by mystify
    For example, I have a huge switch control structure with a few hundred checks. They're an animation sequence, which is numbered from 0 to n. Someone said I can't use variables with switch. What I need is something like: NSInteger step = 0; NSInteger i = 0; switch (step) { case i++: // do stuff break; case i++: // do stuff break; case i++: // do stuff break; case i++: // do stuff break; } The point of this is, that the animation system calls a method with this big switch structure, giving it a step number. I want to be able to simply cut-copy-paste large blocks and put them in a different position inside the switch. for example, the first 50 blocks to the end. I could do that easily with a huge if-else structure, but it would look ugly and something tells me switch is much faster. How to?

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  • iPhone - Get a pointer to the data behind CGDataProvider?

    - by jtrim
    I'm trying to take a CGImage and copy its data into a buffer for later processing. The code below is what I have so far, but there's one thing I don't like about it - it's copying the image data twice. Once for CGDataProviderCopyData() and once for the :getBytes:length call on imgData. I haven't been able to find a way to copy the image data directly into my buffer and cut out the CGDataProviderCopyData() step, but there has to be a way...any pointers? (...pun ftw) NSData *imgData = (NSData *)(CGDataProviderCopyData(CGImageGetDataProvider(myCGImageRef))); CGImageRelease(myCGImageRef); // i've got a previously-defined pointer to an available buffer called "mybuff" [imgData getBytes:mybuff length:[imgData length]];

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  • How does an NSTextField know that it's value has changed?

    - by Brian Postow
    I have a textfield that can either be edited by hand, or set through another control. (It's a page number, so you can jump to page 16 by typing in 16, or you can page up and down with the next/prev buttons) I have the value of the text field bound to an int page variable. It seems to work correctly, when you type a page number in, it jumps, when you page up and down, the page number in the text box changes appropriately. However, at some level, when I page up and down, the text box doesn't seem to know that it's value has changed, because if I type 1 it doesn't do anything. It doesn't call the bound set-method or anything. It looks like the textfield is thinking "I'm already 1, so I don't need to do anything." Even though it was 5 because I hit next 4 times. If I type an number other than 1, it goes there. If I THEN type 1, it goes to page 1, because now it thinks it's on that other page. The problem seems to be that I'm changing the value of the textfield programatically, but some part isn't getting the message. Does this seem like a reasonable explanation? And either way, any ideas on what's causing it? thanks

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  • Create a UIView Subclass that calls a delegate function whenever it's parent viewController appears?

    - by Andrew Johnson
    UIViewControllers have viewWillAppear, viewDidDisappear, etc. delegate methods. I would like to create a UIView subclass that can be added to a viewController's view, and when that UIViewController apears or disappears, a delegate function is called. I could easily do this by putting function calls in the UIViewController viewWillAppear/viewWillDisappear delegate functions, but how can I encapsulate this behavior in the UIView?

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  • Problem in encoding and decoding the string in Iphone sdk

    - by monish
    HI Guys, Here I am having a problem In encoding/decoding the strings. Actually I had a string which I am encoding it using the base64.which was working fine. And now I need to decode the string that was encoded before and want to print it. I code I written as: I imported the base64.h and base64.m files into my application which contains the methods as: + (NSData *) dataWithBase64EncodedString:(NSString *) string; - (id) initWithBase64EncodedString:(NSString *) string; - (NSString *) base64EncodingWithLineLength:(unsigned int) lineLength; And the code in my view controller where I encode the String is: - (id)init { if (self = [super init]) { // Custom initialization userName = @"Sekhar"; password = @"Bethalam"; } return self; } -(void)reloadView { NSString *authStr = [NSString stringWithFormat:@"%@:%@",userName,password]; NSData *authData = [authStr dataUsingEncoding:NSASCIIStringEncoding]; NSString *authValue = [NSString stringWithFormat:@"%@", [authData base64EncodingWithLineLength:30]]; NSLog(authValue); //const char *str = authValue; //NSString *decStr = [StringEncryption DecryptString:authValue]; //NSLog(decStr); //NSData *decodeData = [NSData decode:authValue]; //NSString *decStr = [NSString stringWithFormat:@"%@",decodeData]; //NSStr //NSLog(decStr); } -(void)viewWillAppear:(BOOL)animated { [self reloadView]; } and now I want to decode the String that I encoded. But I dont know How to do that.can anyone suggest me with code how to get it. Anyone's help will be much appreciated. Thank you, Monish.

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  • UIPageControl design challenge

    - by Sheehan Alam
    My app has a UITabBarController that loads many different UINavigationControllers. I want a UIPageControl to switch between the different UINavigationControllers. Do I place the UIPageControl in my UINavigationController or in my appDelegate? Suggestions and best practices are welcome.

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  • Unit testing an iPhone static library with XCode 3

    - by teabot
    I am writing a number of static libraries for the iPhone and wish also to have suites of unit tests. XCode 3 provides templates for both static libraries and unit tests but I am wondering how they should fit together in a static library project? In my static library project I have created a target for unit testing but expect to also create an executable to kick off the unit tests than run against the classes in the static library. What is the procedure for doing this?

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  • Unable to retrieve data from SQLite database iOS6.0

    - by kunalg
    When i run build ios5.0 or less then Sqlite response correct and retrieve data its work fine but when run on ios6.0 i am trying to fetch data from my.sqlite database but it is not executing my if case. It always enters in else condition. What wrong thing i am doing? I am not able to execute my if case i.e. if(sqlite3_prepare_v2(database, sqlQuerry, -1, &querryStatement, NULL)==SQLITE_OK). for reference check this code . NSLog(@"sqlite3_prepare_v2 = %d SQLITE_OK %d ",sqlite3_prepare_v2(sqlite, [strQuery UTF8String], -1, &compiledStatement, nil),SQLITE_OK); if(sqlite3_prepare_v2(sqlite, [strQuery UTF8String], -1, &compiledStatement, nil)==SQLITE_OK) { NSLog(@"sqlite3_step = %d SQLITE_ROW %d ",sqlite3_step(compiledStatement),SQLITE_ROW); while (sqlite3_step(compiledStatement)==SQLITE_ROW) { if(sqlite3_column_text(compiledStatement, 2) != nil) modelObj.Name = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)]; } } else { } ////////// in ios6.0 log Print sqlite3_prepare_v2 = 1 SQLITE_OK 0 sqlite3_step = 21 SQLITE_ROW 100 in iOS5.0 log Print sqlite3_prepare_v2 = 0 SQLITE_OK 0 sqlite3_step = 100 SQLITE_ROW 100

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  • How to do a natural sort on an NSArray?

    - by Cory Imdieke
    I've got an array of objects, and I need them sorted by their "title" key. It's currently working, though it's using an ASCII sort instead of a natural sort. The titles are filenames, so they look like this: file1 file2 file3 ... file10 file11 file12 I'm getting, as you would expect: file1 file10 file11 file12 file2 file3 ... Does anyone know if there is a way built-in to the NSArray sorting functionality to get this natural sorting as opposed to the alphabetical sort? I found some generic algorithms, but I was hoping for something built-in...

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  • Problem with XML parser

    - by zp26
    Hi, I have a problem with parsing XML. I have created a program which write a file xml in the project directory. The file XML are correct. (i checked). When i try to read this XML the program crash and return 1 status. I have controlled my 2 path and they are equals. Can you help me please? Thanks so much. #import "PositionIdentifierViewController.h" #import "WriterXML.h" @implementation PositionIdentifierViewController - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { NSString *stringa = [NSString stringWithFormat:@"%@",string]; textArea.text = [textArea.text stringByAppendingString:@"\n"]; textArea.text = [textArea.text stringByAppendingString:stringa]; } -(IBAction)startParsing { NSURL *xmlURL = [NSURL fileURLWithPath:path]; NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; [parser setDelegate:self]; BOOL success = [parser parse]; if(success == YES){ // } [parser release]; } // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; NSArray *tempPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectoryPath = [tempPaths objectAtIndex:0]; path = [documentsDirectoryPath stringByAppendingPathComponent:@"filePosizioni.xml"]; WriterXML *newWriter; newWriter = [[WriterXML alloc]init]; [newWriter saveXML:(NSString*)@"ciao":(float)10:(float)40:(float)70]; [newWriter saveXML:(NSString*)@"pippo":(float)20:(float)50:(float)80]; [newWriter saveXML:(NSString*)@"pluto":(float)30:(float)60:(float)90]; NSLog(path); } - (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 { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [super dealloc]; } @end #import "WriterXML.h" @implementation WriterXML -(void)saveXML:(NSString*)name:(float)x:(float)y:(float)z{ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectoryPath = [paths objectAtIndex:0]; NSString *filePath = [documentsDirectoryPath stringByAppendingPathComponent:@"filePosizioni.xml"]; NSFileHandle *myHandle; NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *titoloXML = [NSString stringWithFormat:@"<?xml version=1.0 encoding=UTF-8 ?>"]; NSString *inizioTag = [NSString stringWithFormat:@"\n\n\n<position>"]; NSString *tagName = [NSString stringWithFormat:@"\n <name>%@</name>", name]; NSString *tagX = [NSString stringWithFormat:@"\n <x>%f</x>", x]; NSString *tagY = [NSString stringWithFormat:@"\n <y>%f</y>", y]; NSString *tagZ = [NSString stringWithFormat:@"\n <z>%f</z>", z]; NSString *fineTag= [NSString stringWithFormat:@"\n</position>"]; NSData* dataTitoloXML = [titoloXML dataUsingEncoding: NSASCIIStringEncoding]; NSData* dataInizioTag = [inizioTag dataUsingEncoding: NSASCIIStringEncoding]; NSData* dataName = [tagName dataUsingEncoding: NSASCIIStringEncoding]; NSData* dataX = [tagX dataUsingEncoding: NSASCIIStringEncoding]; NSData* dataY = [tagY dataUsingEncoding: NSASCIIStringEncoding]; NSData* dataZ = [tagZ dataUsingEncoding: NSASCIIStringEncoding]; NSData* dataFineTag = [fineTag dataUsingEncoding: NSASCIIStringEncoding]; if(![fileManager fileExistsAtPath:filePath]) [fileManager createFileAtPath:filePath contents:dataTitoloXML attributes:nil]; myHandle = [NSFileHandle fileHandleForUpdatingAtPath:filePath]; [myHandle seekToEndOfFile]; [myHandle writeData:dataInizioTag]; NSLog(@"writeok"); [myHandle seekToEndOfFile]; [myHandle writeData:dataName]; NSLog(@"writeok"); [myHandle seekToEndOfFile]; [myHandle writeData:dataX]; NSLog(@"writeok"); [myHandle seekToEndOfFile]; [myHandle writeData:dataY]; NSLog(@"writeok"); [myHandle seekToEndOfFile]; [myHandle writeData:dataZ]; NSLog(@"writeok"); [myHandle seekToEndOfFile]; [myHandle writeData:dataFineTag]; NSLog(@"writeok"); [myHandle seekToEndOfFile]; NSLog(@"zp26 %@",filePath); } @end

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  • Is this a correct porting of java.util.Random in objectiveC

    - by dipu
    I have ported the code inside java.util.Random class in objectivec. I want to have an identical random number generator so that it synchs with the server app running on java. Now is this a safe porting and if not is there a way to mimic AtomicLong as it is found in java? Please see my code below. static long long multiplier = 0x5DEECE66DL; static long addend = 0xBL; static long long mask = (0x1000000000000001L << 48) - 1; -(void) initWithSeed:(long long) seed1 { [self setRandomSeed: 0L];// = new AtomicLong(0L); [self setSeed: seed1]; } -(int) next:(int)bits { long long oldseed, nextseed; long long seed1 = [self.randomSeed longLongValue]; //AtomicLong //do { oldseed = seed1; nextseed = (oldseed * multiplier + addend) & mask; //} while (!seed.compareAndSet(oldseed, nextseed)); [self setRandomSeed: [NSNumber numberWithLongLong:nextseed]]; ///int ret = (int)(nextseed >>> (48 - bits)); int ret = (unsigned int)(nextseed >> (48 - bits)); return ret; } -(void) setSeed:(long long) seed1 { seed1 = (seed1 ^ multiplier) & mask; [self setRandomSeed: [NSNumber numberWithLongLong:seed1]]; }

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  • UINavigationController (drawRect:)

    - by ludo
    Hi, I created an application with a TabBarController, 4 TabBarItems and every TabBarItem have is own NavigationController file (everything created in IB). I'm using the drawRect function to design my navigationBar: @implementation UINavigationBar (customImage) -(void)drawRect:(CGRect)rect { UIImage *image = [UIImage imageNamed:@"MyImage.png"]; [image drawInRect:CGRectMake(0,0, self.frame.size.width,self.frame.size.height)]; } @end The problem is that the NavigationBar change for every ViewController inside my app, what I want is only draw the NavigationBar for one TabBarItem only and use the default navigationBar for other controller. How to do that? Thanks,

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  • Efficient method of getting all plist arrays into one array?

    - by cannyboy
    If I have a plist which is structured like this: Root Array Item 0 Dictionary City String New York People Array Item 0 String Steve Item 1 String Paul Item 2 String Fabio Item 3 String David Item 4 String Penny Item 1 Dictionary City String London People Array Item 0 String Linda Item 1 String Rachel Item 2 String Jessica Item 3 String Lou Item 2 Dictionary City String Barcelona People Array Item 0 String Edward Item 1 String Juan Item 2 String Maria Then what is the most efficient way of getting all the names of the people into one big NSArray?

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  • Reading Certificates on iOS Problem

    - by David Schiefer
    I am trying to read certificates from various URLs in iOS. My code however is not working well - the array that should return the information I need always returns null. What am I missing? - (void)findCertificate:(NSString *)url { NSInputStream*input = [[NSInputStream inputStreamWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://store.writeitstudios.com"]]] retain]; [input setDelegate:self]; [input scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode]; [input open]; NSLog(@"Status: %i",[input streamStatus]); } - (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode { NSLog(@"handle Event: %i",eventCode); if (eventCode == NSStreamStatusOpen) { NSArray *certificates = (NSArray*)CFReadStreamCopyProperty((CFReadStreamRef)aStream, kCFStreamPropertySSLPeerCertificates); NSLog(@"Certs: %@",CFReadStreamCopyProperty((CFReadStreamRef)aStream, kCFStreamPropertySSLPeerCertificates)); if ([certificates count] > 0) { SecCertificateRef certificate = (SecCertificateRef)[certificates objectAtIndex:0]; NSString *description = (NSString*)SecCertificateCopySubjectSummary(certificate); NSData *data = (NSData *)SecCertificateCopyData(certificate); NSLog(@"Description: %@",description); } } } And yes, I am aware that I am leaking memory. This is just a snippet.

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  • Is garbage collection supported for iPhone applications?

    - by Mustafa
    Does the iPhone support garbage collection? If it does, then what are the alternate ways to perform the operations that are performaed using +alloc and -init combination: NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:xmlData]; UIImage *originalImage = [[UIImage alloc] initWithData:data]; detailViewController = [[[DetailViewController alloc] initWithNibName:@"DetailView bundle:[NSBundle mainBundle]] autorelease]; ... and other commands. Thank you in advance for any help or direction that you can provide.

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  • how do I copy UITextField data into a UILabel

    - by orangecl4now
    I have a textfield and a label. When you touch the textfield, the keyboard appears In IB, the textfield's properties are Keyboard: ASCII Capable Return Key: Done I wired the IBOutlet to the label and the textfield. How do I get the keyboard to go away when I'm done entering text. How do I get to copy the text to the UIlabel? thanks

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  • Locaization in Mac appln.

    - by Frederic Soreng
    Hi , I'm trying to add localization to my mac appln. with the localized files and xib for the danish language. When i compile it accepts danish key entries as expected but after the packaging the software it won't accpet any othe language besides the default "english" language. Please guide me if any one have worked out with this problem.

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