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• Getting HTML source(NSData) from website that needs logging in (iphone)

  - by Jonathan

  NSData *data = [[NSData alloc] initWithContentsOfURL:url]; Url is an NSURL and it works fine. However I'd like to get the HTML (data) after I've logged in. So the website has a standard way of logging in with 2 textboxes and a submit action on the form. So how can I log in then get the HTMl source so I can parse it. Do i have to use something other than NSData?

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• error writing to plist

  - by Najeebullah Shah

  [array writeToFile:[documentsDirectory stringByAppendingPathComponent:@"data.plist" atomically:YES]; this line gives error that method -stringByAppendingPathComponent not found. whats the issue NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSArray *array = [[NSArray alloc]initWithObjects:@"First", @"Second", @"Third", nil]; [array writeToFile:[documentsDirectory stringByAppendingPathComponent:@"data.plist" atomically:YES]];

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• Simple calculator app crashes when a third number key is punched.

  - by Justin

  Hi , I am a newbie to the iphone app world. So I thought I try my luck with a calculator app. Unfortunately I am running into an issue where if I press a third key in the calculator the app crashes. Sometimes I get this error EXC_BAD_ACCESS. Here is a code in my CalculatorViewController.m file. #import "CalculatorViewController.h" @implementation CalculatorViewController @synthesize screenText; - (IBAction)buttonPressed:(id)sender { NSString *title = [sender titleForState:UIControlStateNormal]; [self collect:title]; } - (void)collect:(NSString *)digitz { NSString * newText = nil; if ([digitz isEqualToString:@"+"]) { [self add:result]; big_digit = nil; } else if ([digitz isEqualToString:@"+"]) { [self sub:result]; } else if ([digitz isEqualToString:@"x"]) { [self multiply:result]; } else if ([digitz isEqualToString:@"="]) { [self equate:result]; } else { if (big_digit != nil && [big_digit isEqualToString:@"0"] == FALSE) big_digit = [big_digit stringByAppendingFormat:@"%@",digitz]; else big_digit = (NSMutableString *) digitz; result = (int) big_digit; newText = [[NSString alloc] initWithFormat: @"%@",big_digit]; } screenText.text = newText; [newText release]; } - (void)add:(int)res { NSString * newText = nil; ans = ans + res; newText = [[NSString alloc] initWithFormat: @"%@",ans]; screenText.text = newText; [newText release]; } Can anyone spot an obvious issue here. Here is the respective header file too. #import <UIKit/UIKit.h> @interface CalculatorViewController : UIViewController { UILabel *screenText; int number; int result; int ans; //NSString *big_digit; NSMutableString * big_digit ; } @property (nonatomic, retain) IBOutlet UILabel *screenText; - (IBAction)buttonPressed:(id)sender; - (void)collect:(NSString *)digitz; - (void)add:(int)num; - (void)sub:(int)num; - (void)multiply:(int)num; - (void)equate:(int)num; @end

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• How to update NSMutableDictionary. My code doesn't work.

  - by dawatson833

  I've populated an array using. arrSettings = [[NSMutableArray alloc] initWithContentsOfFile:[self settingsPath]]; The file is a plist with the root as an array and then a dictionary with three three keys defined as number. I've also tried setting the keys to string. I display the values in the plist file on a view using. diaper = [[arrSettings objectAtIndex:0] objectForKey:@"Diaper Expenses"]; oil = [[arrSettings objectAtIndex:0] objectForKey:@"Oil Used"]; tree = [[arrSettings objectAtIndex:0] objectForKey:@"Wood Used"]; This code works fine, the values in the dictionary are assigned to the variables and they are displayed. The user can make changes and then press a save button. I use this code to extract the dictionary part of the array so I can update it. The assignment to editDictionary works. I've double checked the key names including case and that is correct. editDictionary = [[NSMutableDictionary alloc] init]; editDictionary = [arrSettings objectAtIndex:0]; NSNumber *myNumber = [NSNumber numberWithFloat:diaperAmount]; [editDictionary setValue:myNumber forKey:@"Diaper Expenses"]; myNumber = [NSNumber numberWithFloat:oilAmount]; [editDictionary setValue:myNumber forKey:@"Oil Used"]; myNumber = [NSNumber numberWithFloat:treeAmount]; [editDictionary setValue:myNumber forKey:@"Wood Used"]; In this example I've used a nsnumber. But I've also tried the xxxAmount field as part of SetValue instead of creating a NSNumber. Neither implementation works. Several strange things happen. Sometimes the first two setvalue statements work, but the last setvalue fails with a EXC_BAD_ACCESS failure. Other times the first setValue fails with the same error. I have no idea why the first two sometimes work. I'm at a loss of what to do next. I've tried several implentations and none of them work. Also, in the debugger how can I display the editDictionary elements. I can see editDictionary, but I don't know how to display the individual elements.

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• Why is there no way to do introspection in Objective C with Objects?

  - by user346741

  I have seen examples (on here especially) of calling hideous C functions and getting structures back that have to be iterated, replete with reams of underbars. Why can't I do this (pseudo to follow): Money *cost = [[Money alloc] init]; for (Property *property in [[cost class] properties]){ .. } for (Method *method in [[cost class] methods]){ .. } ?

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• how can i access a value on a cell in tableview from different class?

  - by ahmet732

  I can hold the value of touched cell but I cannot pass that value to another class or call from that class. SearchTableViewController.m **deneme= [[NSMutableArray alloc]init]; deneme=[tableData objectAtIndex:indexPath.row]; NSLog(@"my row = %@", deneme); //I can hold one of the selected or touched rows in table HistoryTableViewController.m **SearchTableViewController *obj = (SearchTableViewController *)[self.tabBarController.viewControllers objectAtIndex:11]; NSLog(@"my 2nd row= %@", [obj deneme]); //It doesn't retrieve here

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• How do I set an ABPeoplePickerNavigationController's prompt?

  - by mverzilli

  This is the code I'm using to call the people picker, but the prompt label text doesn't change: ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init]; picker.peoplePickerDelegate = self; picker.displayedProperties = [NSArray arrayWithObjects: [NSNumber numberWithInt:kABPersonEmailProperty], nil]; picker.navigationItem.prompt = @"Choose a contact to..."; [self presentModalViewController:picker animated:YES];

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• iphone: unrecognized selector sent to instance

  - by eshalev

  I am new to objective C, So maybe there is some basic thing that I am missing about selectors. I would like to understand the basic concept behind this error as I have not found an general error reference. I am getting this error when using: [CloseButton addTarget:PageContents action:@selector(CloseButtonPressed) forControlEvents:UIControlEventTouchUpInside]; and then later: - (void)CloseButtonPressed:(id)sender{ UIAlertView *someError = [[UIAlertView alloc] initWithTitle: @"Comment" message: @"hello" delegate: self cancelButtonTitle: @"Ok" otherButtonTitles: nil]; [someError show]; [someError release]; }

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• Release Quickie

  - by Meltemi

  How to succinctly handle this situation. I'm not properly releasing contactDictionary in the if statement... NSNumber *pIDAsNumber; ... NSMutableDictionary *contactDictionary = [NSMutableDictionary dictionaryWithDictionary:[defaults dictionaryForKey:kContactDictionary]]; if (!contactDictionary) { contactDictionary = [[NSMutableDictionary alloc] initWithCapacity:1]; } [contactDictionary setObject:pIDAsNumber forKey:[myClass.personIDAsNumber stringValue]]; [defaults setObject:contactDictionary forKey:kContactDictionary];

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• Issues declaring already existing NSMutableArray in new class

  - by Graeme

  I have a class (DataImporter) which has the code to download an RSS feed. I also have a view and separate class (TableView) which displays the data in a UITableView and starts the parsing process, storing parsed information in an NSMutableArray (items) which is located in the (TableView) subclass. Now I wish to add a UIMapView which displays the items in the (items) NSMutableArray. Herein lies the issue - I need to somehow get the data from the (items) NSMutableArray into the new (mapView) subclass which I'm struggling with - and I preferably don't want to have to create a new class to download the data again for the mapView class when it already is in the applications memory. Is there a way I can transfer the information from the NSMutableArray (items) class to the (mapView) class (i.e. how do I declare the NSMutableArray in the (mapView) class)? Here's a overview of how the system works: App opened Data downloaded (using DataImporter class) when (TableView) viewDidLoad runs Data stored in NSMutableArray accessible by the (TableView) class And from here I need to access and declare the array from a new (mapView) class. Any help greatly appreciated, thanks. Code for viewDidLoad MapKit: Data *data = nil; NSString *ilocation = [data locations]; NSString *ilocation2 = @"New Zealand"; NSString *inewlString; inewlString = [ilocation stringByAppendingString:ilocation2]; NSLog(@"inewlString=%@",inewlString); if(forwardGeocoder == nil) { forwardGeocoder = [[BSForwardGeocoder alloc] initWithDelegate:self]; } // Forward geocode! [forwardGeocoder findLocation: inewlString]; Code for parsing data into original NSMutable Array: - (void)beginParsing { NSLog(@"Parsing has begun"); //self.navigationItem.rightBarButtonItem.enabled = NO; // Allocate the array for song storage, or empty the results of previous parses if (incidents == nil) { NSLog(@"Grabbing array"); self.datas = [NSMutableArray array]; } else { [datas removeAllObjects]; [self.tableView reloadData]; } // Create the parser, set its delegate, and start it. self.parser = [[DataImporter alloc] init]; parser.delegate = self; [parser start]; }

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• iPhone. About action target again.

  - by Siegfried

  This line of code is in AController.m UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addItem)]; And -(void)addItem is also in AController.m If I want to call a method -(void)addItem1 in BController.m, how can I change to make it work? What should I pass to the target parameter? Many thanks!

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• Twitter API problem iPhone

  - by Manoj Kumar

  I have tried to use twitter API in my application using MGTwiiterEngine, I think Ih ave configured all thing but while I am running the app by giving my username and password. The delegate of the MGTwitterEngine was called with the 0 statuses and also the numberOfConnections=0. twitterEngine = [[MGTwitterEngine alloc] initWithDelegate:self]; [twitterEngine setUsername:username password:password]; [twitterEngine getRepliesStartingAtPage:0]; Can any one please help me out. Thanks in advance

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• A NSMutableArray is destroying my life!

  - by camilo

  EDITED to show the relevant part of the code Hi. There's a strange problem with an NSMutableArray which I'm just not understanding... Explaining: I have a NSMutableArray, defined as a property (nonatomic, retain), synthesized, and initialized with 29 elements. realSectionNames = [[NSMutableArray alloc] initWithCapacity:29]; After the initialization, I can insert elements as I wish and everything seems to be working fine. While I'm running the application, however, if I insert a new element in the array, I can print the array in the function where I inserted the element, and everything seems ok. However, when I select a row in the table, and I need to read that array, my application crashes. In fact, it cannot even print the array anymore. Is there any "magical and logical trick" everybody should know when using a NSMutableArray that a beginner like myself can be missing? Thanks a lot. I declare my array as realSectionNames = [[NSMutableArray alloc] initWithCapacity:29]; I insert objects in my array with [realSectionNames addObject:[category categoryFirstLetter]]; although I know i can also insert it with [realSectionNames insertObject:[category categoryFirstLetter] atIndex:i]; where the "i" is the first non-occupied position. After the insertion, I reload the data of my tableView. Printing the array before or after reloading the data shows it has the desired information. After that, selecting a row at the table makes the application crash. This realSectionNames is used in several UITableViewDelegate functions, but for the case it doesn't matter. What truly matters is that printing the array in the beginning of the didSelectRowAtIndexPath function crashes everything (and of course, doesn't print anything). I'm pretty sure it's in that line, for printing anything he line before works (example): NSLog(@"Anything"); NSLog(@"%@", realSectionNames); gives the output: 2010-03-24 15:16:04.146 myApplicationExperience[3527:207] Anything [Session started at 2010-03-24 15:16:04 +0000.] GNU gdb 6.3.50-20050815 (Apple version gdb-967) (Tue Jul 14 02:11:58 UTC 2009) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-apple-darwin".sharedlibrary apply-load-rules all Attaching to process 3527. Still not understanding what kind of stupidity I've done this time... maybe it's not too late to follow the career of brain surgeon?

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• Loading images to UIScrollview crashes

  - by Icky

  Hello All. I have a Navigationcontroller pushing a UIViewController with a scrollview inside. Within the scrollview I download a certain number of images around 20 (sometimes more) each sized around 150 KB. All these images are added to the scrollview so that their origin is x +imageSize and the following is sorted right to the one before. All in all I think its a lot of data (3-4 MB). On an I pod Touch this sometimes crashes, the IPhone can handle it once, if it has to load the data again (some other images) , it crashes too. I guess its a memory issue but within my code, I download the image, save it to a file on the phone as NSData, read it again from file and add it to a UIImageview which I release. So I have freed the memory I allocated, nevertheless it still crashes. Can anyone help me out? Since Im new to this, I dont know the best way to handle the Images in a scrollview. Besides I create the controller at start from nib, which means I dont have to release it, since I dont use alloc - right? Code: In my rootviewcontroller I do: -(void) showImages { [[self naviController] pushViewController:imagesViewController animated:YES]; [imagesViewController viewWillAppear:YES]; } Then in my Controller handling the scroll View, this is the method to load the images: - (void) loadOldImageData { for (int i = 0; i < 40 ; i++) { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"img%d.jpg", i]]; NSData *myImg = [NSData dataWithContentsOfFile:filePath]; UIImage *im = [UIImage imageWithData:myImg]; if([im isKindOfClass:[UIImage class]]) { NSLog(@"IM EXISTS"); UIImageView *imgView = [[UIImageView alloc] initWithImage:im]; CGRect frame = CGRectMake(i*320, 0, 320, 416); imgView.frame = frame; [myScrollView addSubview:imgView]; [imgView release]; //NSLog(@"Adding img %d", i); numberImages = i; NSLog(@"setting numberofimages to %d", numberImages); //NSLog(@"scroll subviews %d", [myScrollView.subviews count]); } } myScrollView.contentSize = CGSizeMake(320 * (numberImages + 1), 416); }

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• Changing background color on UIScrollView?

  - by Andreas Johannessen

  Hi How do I change the black/gray color to white? This is just a simple view with a UIView attached to the UIViewControllers property together a with a webview that fills the UIView. UPDATE Here's the code that works: - (void)loadView { UIWebView *webview = [[UIWebView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 416.0f)]; [webView setBackgroundColor:[UIColor whiteColor]]; self.view = webView; [webview release]; } Thanks in advance.

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• How to download file from particular url???

  - by greshi gupta

  NSURL * url = @"http://192.168.100.161/UploadWhiteB/wh.txt"; NSData * data = [NSData dataWithContentsOfURL:url]; if (data != nil) { NSLog(@"\nis not nil"); NSString *readdata = [[NSString alloc] initWithContentsOfURL:(NSData *)data ]; I write this code to download a file from given url... but i get an error on line NSData * data = [NSData dataWithContentsOfURL:url]; uncaught exception....so please help me out..

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• How to store enum values in a NSMutableArray

  - by Oysio

  My problem is since an enum in objective-c essentially is an int value, I am not able to store it in a NSMutableArray. Apparently NSMutableArray won't take any c-date types like an int. Is there any common way to achieve this ? typedef enum { green, blue, red } MyColors; NSMutableArray *list = [[NSMutableArray alloc] initWithObjects: green, blue, red, nil]; //Get enum value back out MyColors greenColor = [list objectAtIndex:0];

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• TouchCode XML parsing error

  - by itsaboutcode

  Hi, I have a xml document which has only one element in the document, which is <error>error string<error> But when i try to parse it, it says this document has no element at all. In other words when i try to access the rootElement it says "null" CXMLDocument *rssParser = [[[CXMLDocument alloc] initWithContentsOfURL:url options:0 error:nil] autorelease]; NSLog(@"Root: %@",[[rssParser rootElement] name]); Please tell me what is wroing with this. Thanks

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• deallocated memory in tableview: message sent to deallocated instance

  - by Kirn

  I tried looking up other issues but couldn't find anything to match so here goes: I'm trying to display text in the table view so I use this bit of code: // StockData is an object I created and it pulls information from Yahoo APIs based on // a stock ticker stored in NSString *heading NSArray* tickerValues = [heading componentsSeparatedByString:@" "]; StockData *chosenStock = [[StockData alloc] initWithContents:[tickerValues objectAtIndex:0]]; [chosenStock getData]; // Set up the cell... NSDictionary *tempDict = [chosenStock values]; NSArray *tempArr = [tempDict allValues]; cell.textLabel.text = [tempArr objectAtIndex:indexPath.row]; return cell; This is all under cellForRowAtIndexPath When I try to release the chosenStock object though I get this error: [CFDictionary release]: message sent to deallocated instance 0x434d3d0 Ive tried using NSZombieEnabled and Build and Analyze to detect problems but no luck thus far. Ive even gone so far as to comment bits and pieces of the code with NSLog but no luck. I'll post the code for StockData below this. As far as I can figure something is getting deallocated before I do the release but I'm not sure how. The only place I've got release in my code is under dealloc method call. Here's the StockData code: // StockData contains all stock information pulled in through Yahoo! to be displayed @implementation StockData @synthesize ticker, values; - (id) initWithContents: (NSString *)newName { if(self = [super init]){ ticker = newName; } return self; } - (void) getData { NSURL *url = [NSURL URLWithString: [NSString stringWithFormat:@"http://download.finance.yahoo.com/d/quotes.csv?s=%@&f=%@&e=.csv", ticker, @"chgvj1"]]; NSError *error; NSURLResponse *response; NSURLRequest *request = [NSURLRequest requestWithURL:url]; NSData *stockData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; if(stockData) { NSString *tempStr = [[NSString alloc] initWithData:stockData encoding:NSASCIIStringEncoding]; NSArray *receivedValuesArr = [tempStr componentsSeparatedByString:@","]; [tempStr release]; values = [NSDictionary dictionaryWithObjects:receivedValuesArr forKeys:[@"change, high, low, volume, market" componentsSeparatedByString:@", "]]; } else { NSLog(@"Connection failed: %@", error); } } - (void)dealloc { [ticker release]; [values release]; [super dealloc]; NSLog(@"Release took place fine"); } @end

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• Objective-C Basic class related question, retaining the value of a specific object using a class fil

  - by von steiner

  Members, scholars, code gurus. My background is far from any computer programming thus my question may seems basic and somewhat trivial to you. Nevertheless it seems that I can't put my head around it. I have googled and searched for the answer, just to get myself confused even more. With that, I would kindly ask for a simple explanation suitable for a non technical person such as myself and for other alike arriving to this thread. I have left a comment with the text "Here is the issue" below, referring to my question. // character.h #import <Foundation/Foundation.h> @interface character : NSObject { NSString *name; int hitPoints; int armorClass; } @property (nonatomic,retain) NSString *name; @property int hitPoints,armorClass; -(void)giveCharacterInfo; @end // character.m #import "character.h" @implementation character @synthesize name,hitPoints,armorClass; -(void)giveCharacterInfo{ NSLog(@"name:%@ HP:%i AC:%i",name,hitPoints,armorClass); } @end // ClassAtLastViewController.h #import <UIKit/UIKit.h> @interface ClassAtLastViewController : UIViewController { } -(void)callAgain; @end // ClassAtLastViewController.m #import "ClassAtLastViewController.h" #import "character.h" @implementation ClassAtLastViewController - (void)viewDidLoad { //[super viewDidLoad]; character *player = [[character alloc]init]; player.name = @"Minsc"; player.hitPoints = 140; player.armorClass = 10; [player giveCharacterInfo]; [player release]; // Up until here, All peachy! [self performSelector:@selector(callAgain) withObject:nil afterDelay:2.0]; } -(void)callAgain{ // Here is the issue, I assume that since I init the player again I loss everything // Q1. I loss all the data I set above, where is it than? // Q2. What is the proper way to implement this character *player = [[character alloc]init]; [player giveCharacterInfo]; } Many thanks in advance, Kindly remember that my background is more related to Salmons breeding than to computer code, try and lower your answer to my level if it's all the same to you.

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• Get UITableView to scroll to the selected UITextField and Avoid Being Hidden by Keyboard

  - by Lauren Quantrell

  I have a UITextField in a table view on a UIViewController (not a UITableViewController). If the table view is on a UITableViewController, the table will automatically scroll to the textField being edited to prevent it from being hidden by the keyboard. But on a UIViewController it does not. I have tried for a couple of days reading through multiple ways to try to accomplish this and I cannot get it to work. The closest thing that actually scrolls is: -(void) textFieldDidBeginEditing:(UITextField *)textField { // SUPPOSEDLY Scroll to the current text field CGRect textFieldRect = [textField frame]; [self.wordsTableView scrollRectToVisible:textFieldRect animated:YES]; } However this only scrolls the table to the topmost row. What seems like an easy task has been a couple of days of frustration. I am using the following to construct the tableView cells: - (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSString *identifier = [NSString stringWithFormat: @"%d:%d", [indexPath indexAtPosition: 0], [indexPath indexAtPosition:1]]; UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:identifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier] autorelease]; cell.accessoryType = UITableViewCellAccessoryNone; UITextField *theTextField = [[UITextField alloc] initWithFrame:CGRectMake(180, 10, 130, 25)]; theTextField.adjustsFontSizeToFitWidth = YES; theTextField.textColor = [UIColor redColor]; theTextField.text = [textFieldArray objectAtIndex:indexPath.row]; theTextField.keyboardType = UIKeyboardTypeDefault; theTextField.returnKeyType = UIReturnKeyDone; theTextField.font = [UIFont boldSystemFontOfSize:14]; theTextField.backgroundColor = [UIColor whiteColor]; theTextField.autocorrectionType = UITextAutocorrectionTypeNo; theTextField.autocapitalizationType = UITextAutocapitalizationTypeNone; theTextField.clearsOnBeginEditing = NO; theTextField.textAlignment = UITextAlignmentLeft; //theTextField.tag = 0; theTextField.tag=indexPath.row; theTextField.delegate = self; theTextField.clearButtonMode = UITextFieldViewModeWhileEditing; [theTextField setEnabled: YES]; [cell addSubview:theTextField]; [theTextField release]; } return cell; } I suspect I can get the tableView to scroll properly if I can somehow pass the indexPath.row in the textFieldDidBeginEditing method? Any help is appreciated.

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• masked the pasword input to UITexfield

  - by user262325

  Hello everyone I hope to mask the text input to UITextFiled as: "ABCDE" to "*****" below are my codes without function - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { int l=[textField.text length]; range=NSMakeRange(1, l ); string=[[[NSString alloc]initWithString:@"*"] autorelease]; return YES; } Welcome any comment Thanks interdev

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• UIViewController problem

  - by dragon

  how to get objects values from uiviewcontroller classes iphone. I am using this SecondViewController *newObject=[[SecondViewController alloc]init]; But newobject has textview , its value is zero. How could i access that textview iphone.

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• UITextView cut problem ! (iPhone sdk)

  - by Mc.Lover

  Hi , i have problem with cut some text from UITextView , i idon't understand how can implement Cut , for example copy or paste it's like this : -(IBAction)copy { NSString *copyString = [[NSString alloc] initWithFormat:@"%@",[textPad text]]; UIPasteboard *pb = [UIPasteboard generalPasteboard]; [pb setString:copyString]; } -(IBAction)paste { UIPasteboard *pb = [UIPasteboard generalPasteboard]; textPad.text = [pb string]; } but about cut ! thank you ,

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• What (tf) are the secrets behind PDF memory allocation (CGPDFDocumentRef)

  - by Kai

  For a PDF reader I want to prepare a document by taking 'screenshots' of each page and save them to disc. First approach is CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef) someURL); for (int i = 1; i<=pageCount; i++) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init]; CGPDFPageRef page = CGPDFDocumentGetPage(document, i); ...//getting + manipulating graphics context etc. ... CGContextDrawPDFPage(context, page); ... UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext(); ...//saving the image to disc [pool drain]; } CGPDFDocumentRelease(document); This results in a lot of memory which seems not to be released after the first run of the loop (preparing the 1st document), but no more unreleased memory in additional runs: MEMORY BEFORE: 6 MB MEMORY DURING 1ST DOC: 40 MB MEMORY AFTER 1ST DOC: 25 MB MEMORY DURING 2ND DOC: 40 MB MEMORY AFTER 2ND DOC: 25 MB .... Changing the code to for (int i = 1; i<=pageCount; i++) { CGPDFDocumentRef document = CGPDFDocumentCreateWithURL((CFURLRef) someURL); NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init]; CGPDFPageRef page = CGPDFDocumentGetPage(document, i); ...//getting + manipulating graphics context etc. ... CGContextDrawPDFPage(context, page); ... UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext(); ...//saving the image to disc CGPDFDocumentRelease(document); [pool drain]; } changes the memory usage to MEMORY BEFORE: 6 MB MEMORY DURING 1ST DOC: 9 MB MEMORY AFTER 1ST DOC: 7 MB MEMORY DURING 2ND DOC: 9 MB MEMORY AFTER 2ND DOC: 7 MB .... but is obviously a step backwards in performance. When I start reading a PDF (later in time, different thread) in the first case no more memory is allocated (staying at 25 MB), while in the second case memory goes up to 20 MB (from 7). In both cases, when I remove the CGContextDrawPDFPage(context, page); line memory is (nearly) constant at 6 MB during and after all preparations of documents. Can anybody explain whats going on there?

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