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• Why does this JSON fail only in iPhone?

  - by 4thSpace

  I'm using the JSON framework from http://code.google.com/p/json-framework. The JSON below fails with this error: -JSONValue failed. Error trace is: ( Error Domain=org.brautaset.JSON.ErrorDomain Code=5 UserInfo=0x124a20 "Unescaped control character '0xd'", Error Domain=org.brautaset.JSON.ErrorDomain Code=3 UserInfo=0x11bc20 "Object value expected for key: Phone", Error Domain=org.brautaset.JSON.ErrorDomain Code=3 UserInfo=0x1ac6e0 "Expected value while parsing array" ) JSON being parsed: [{"id" :"2422","name" :"BusinessA","address" :"7100 U.S. 50","lat" :"38.342945","lng" :"-90.390701","CityId" :"11","StateId" :"38","CategoryId" :"1","Phone" :"(200) 200-2000","zip" :"00010"}] I think 0xd represents a carriage. When I put the above JSON in TextWrangler, I don't see any carriage returns. I got the JSON by doing "po myjson" in the debugger. It passes this validator: http://json.parser.online.fr/. Can anyone see what the problem may be?

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• Issue with CGEventTapCreate() call.

  - by Dheeraj

  Hi All, I'm trying to register for global key events using this code : void function() { CFMachPortRef keyUpEventTap = CGEventTapCreate(kCGHIDEventTap,kCGHeadInsertEventTap,kCGEventTapOptionListenOnly,CGEventMaskBit(kCGEventKeyUp),&keyUpCallback,NULL); CFRunLoopSourceRef keyUpRunLoopSourceRef = CFMachPortCreateRunLoopSource(NULL, keyUpEventTap, 0); CFRelease(keyUpEventTap); CFRunLoopAddSource(CFRunLoopGetCurrent(), keyUpRunLoopSourceRef, kCFRunLoopDefaultMode); CFRelease(keyUpRunLoopSourceRef); } The application crashes while executing CFMachPortCreateRunLoopSource() call. I think the crash is because of CGEventMaskBit(kCGEventKeyUp) when I create an event tap. But if I create event tap using CGEventTapCreate(kCGHIDEventTap,kCGHeadInsertEventTap,kCGEventTapOptionListenOnly,CGEventMaskBit(kCGEventFlagsChanged),&keyUpCallback,NULL), the application works fine. It does not crash. I'm getting callbacks when any modifier key is pressed. But I need to get callbacks for delete key pressed. Any ideas? Thanks, Dheeraj.

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• Update table columns bound to NSArrayController

  - by Loz

  Hi, I'm fairly new to the world of bindings in cocoa, and I'm having some troubles (perhaps/probably due to a misunderstanding). I have a singleton that contains an NSMutableArray called plugins, containing objects of class Plugin. It has a method called loadPlugins which adds objects to the plugins array. This may be called at any point. It's been added as an instance in Interface Builder. Also in IB is an NSObjectController, whose content outlet is connected to the singleton. There is also an NSArrayController, whose contentArray is bound to the NSObjectController (controller key is 'selection', model key path is 'plugins', object class name is 'Plugin'). And finally I have a table view with 2 columns, the values of which are bound to the NSArrayController's arrangedObjects, using keys of properties in the Plugin class. So far so standard (as far as I can tell from tutorials at least). My trouble is that when the loadPlugins method is called in the singleton, and objects are added to the plugins array, the table doesn't update to show the objects (unless loadPlugins is called before the nib is loaded). -reloadData called on the tableView doesn't do anything. Is there a way to tell the NSArrayController that the referenced array has been updated? I understand there is the -add: method for NSArrayController, which could be used in the loadPlugins, but this isn't desirable as I want to keep the singleton totally separate from the display aspect. This seems related to: http://stackoverflow.com/questions/1623396/refresh-cocoa-binding-nsarraycontroller-combobox The line: "editing the array behind the controller's back" seems to perhaps pinpoint the problem, but I would hope that it would be possible to have the singleton not know about the controller. Thanks in advance.

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• How do I track down the source of a KVC exception: this class is not key value coding-compliant for

  - by sam

  I get this error when I try to run my app: 2010-04-29 13:49:01.355 MyApp[56123:207] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<MyViewController 0x5112b10> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key toolbar.' MyViewController used to have an IBOutlet called 'toolbar' that connected to a UIToolbar object in a nib. I decided I no longer needed the toolbar or the nib so I removed them from the project. But Xcode seems to still want to refer to 'toolbar'. Where might the reference to toolbar be if I no longer use a nib? I can synthesize a dummy 'toolbar' property to appease Xcode, but I want to avoid this kind of ugly hack.

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• How to move to next textfield using keyboardtype numberandpunctuation using textfield notification

  - by Rani

  Hi guys, I am having code ItemsController.h UITextField* quantity; UITextField* rate; UITextField* tax2; ItemController.m quantity=[[UITextField alloc]initWithFrame:CGRectMake(158,10.5,140,30)]; quantity.textColor = [UIColor blackColor]; quantity.font = [UIFont systemFontOfSize:15.0]; quantity.backgroundColor = [UIColor clearColor]; quantity.returnKeyType=UIReturnKeyNext; quantity.keyboardType = UIKeyboardTypeNumbersAndPunctuation; quantity.leftViewMode = UITextFieldViewModeAlways; quantity.delegate = self; rate=[[UITextField alloc]initWithFrame:CGRectMake(158,10.5,140,30)]; rate.textColor = [UIColor blackColor]; rate.font = [UIFont systemFontOfSize:15.0]; rate.backgroundColor = [UIColor clearColor]; rate.returnKeyType=UIReturnKeyNext; rate.keyboardType = UIKeyboardTypeNumbersAndPunctuation; rate.leftViewMode = UITextFieldViewModeAlways; rate.delegate = self; tax2=[[UITextField alloc]initWithFrame:CGRectMake(158,10.5,140,30)]; tax2.textColor = [UIColor blackColor]; tax2.font = [UIFont systemFontOfSize:15.0]; tax2.backgroundColor = [UIColor clearColor]; tax2.returnKeyType=UIReturnKeyDone; tax2.keyboardType = UIKeyboardTypeAlphabet; tax2.leftViewMode = UITextFieldViewModeAlways; tax2.delegate = self; - (BOOL)textFieldShouldReturn:(UITextField*)textField { if(textField==quantity) { [rate becomeFirstResponder]; } if(textField == rate) { [tax2 becomeFirstResponder]; } else if(textField==tax2) { [textField resignFirstResponder]; } return YES; } Using UITextfield notifications while I am moving from quantity textfield to rate textfield the keyboard type is alphabetical its getting actually I gav eit has Number and punctuation why I am not getting. can any one help me to solve this as soon as possible. Thanks in advance.

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• iPhone: How to detect if an EKEvent instance can be modified?

  - by Tom van Zummeren

  While working with the EventKit on iPhone I noticed that some events can exist which cannot be modified. Examples I encountered so far are birthdays and events synced with CalDAV. When you view the event's details in the standard built-in calendar app on iPhone the "Edit" button in the top-right corner is not visible in these cases, where it would be visible when viewing "normal" events. I've searched everywhere, read all documentation there is but I simply can't find anything that tells me how to detect this behavior! I can only detect it afterwards: edit an event's title save it to the event store check the event's title, if it has not changed it is not editable! I am looking for a way that I can detect the non-editable behavior of an event beforehand. I know this is possible because I've seen other calendar apps implement this correctly.

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• NSURL Connection will/won't load data

  - by jkap

  So here's my issue: I followed the NSURLConnection tutorial in the iPhone Developer Documentation almost to the T, and it only kinda works. Here's where it all goes wrong: The object seems to be created correctly and delegates to connectionDidFinishLoading, but with any URL I try to load the response data always ends up only being 0 bytes. I am running in the simulator if that makes any difference. Here's my relevant code: - (void)viewDidLoad { [super viewDidLoad]; self.title = @"WVFS Player"; //create a request NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://wvfs.josh-kaplan.com/nowPlaying.php"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; // create a connection NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if(theConnection) { // create the datum responseData=[[NSMutableData data] retain]; } else { // code this later } } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [responseData setLength:0]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // make it work NSLog(@"Succeeded! Received %d bytes of data:",[responseData length]); // release it [connection release]; [responseData release]; } And here's my log output: [Session started at 2010-03-14 09:01:09 -0400.] 2010-03-14 09:01:14.784 WVFS[19571:207] Succeeded! Received 0 bytes of data: Any ideas? Thanks, Josh

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• UIButtonTypeRoundedRect as an accessoryView

  - by phunehehe

  Hello, I have a table view and I want to put a label on the right of each cell, so in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath I'm having some code like this UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; button.titleLabel.text = @"title"; cell.accessoryView = button; However, the button is not displaying at all. Anyone know why? I am sure that the declaration is correct, because if I replace the button declaration with UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; then the button appears, which make me think that the rounded rectangle should also appear.

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• Problems with makeObjectsPerformSelector inside and outside a class?

  - by QuakAttak

  A friend and I are creating a card game for the iPhone, and in these early days of the project, I'm developing a Deck class and a Card class to keep up with the cards. I'm wanting to test the shuffle method of the Deck class, but I am not able to show the values of the cards in the Deck class instance. The Deck class has a NSArray of Card objects that have a method called displayCard that shows the value and suit using console output(printf or NSLog). In order to show what cards are in a Deck instance all at once, I am using this, [deck makeObjectsPerformSelector:@selector(displayCard)], where deck is the NSArray in the Deck class. Inside of the Deck class, nothing is displayed on the console output. But in a test file, it works just fine. Here's the test file that creates its own NSArray: #import <Foundation/Foundation.h> #import "card.h" int main (int argc, char** argv) { NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init]; Card* two = [[Card alloc] initValue:2 withSuit:'d']; Card* three = [[Card alloc] initValue:3 withSuit:'h']; Card* four = [[Card alloc] initValue:4 withSuit:'c']; NSArray* deck = [NSArray arrayWithObjects:two,three,four,nil]; //Ok, what if we release the objects in the array before they're used? //I don't think this will work... [two release]; [three release]; [four release]; //Ok, it works... I wonder how... //Hmm... how will this work? [deck makeObjectsPerformSelector:@selector(displayCard)]; //Yay! It works fine! [pool release]; return 0; } This worked beautifully, so I created an initializer around this idea, creating 52 card objects one at a time and adding them to the NSArray using deck = [deck arrayByAddingObject:newCard]. Is the real problem with how I'm using makeObjectsPerformSelector or something before/after it?

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• Passing html parameters to server odd problem

  - by StealthRT

  Hey all i am having a weird problem with sending data back to my server. This is the code i am using: NSString *theURL =[NSString stringWithFormat:@"http://www.xxx.com/confirm.asp?theID=%@&theName=%@&empID=%@&theComp=%@", theConfirmNum, tmpNBUserRow.userName, labelTxt.text, theID]; NSLog(@"%@,%@,%@,%@", theConfirmNum, tmpNBUserRow.userName, labelTxt.text, theID); NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; [request setURL:[NSURL URLWithString:theURL]]; [request setHTTPMethod:@"POST"]; NSError *error; NSURLResponse *response; NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; NSString *data=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding]; if ([data isEqualToString:@"Done"]) I can run the code from the browser and it works just fine using the data i got from the NSLog output. The NSLog output for each value is correct. But for some reason when i put a break on the IF ([data isEqualToString:@"Done"]) it has no return value. I checked each value for what it was sending (and again, it was correct in the NSLog output) and i found that the value "theID" said "Out of scope". Although, again, the NSLog had the value in it correctly? So i searched the forum and found a simular problem. I took their advice and added "RETAIN" to the "theID" value like so: theID = [customObjInstance TID]; [theID retain]; However, that did not solve the issue... Here is the console NSLog output: [Session started at 2010-04-11 01:31:50 -0400.] wait_fences: failed to receive reply: 10004003 wait_fences: failed to receive reply: 10004003 nbTxt(5952,0xa0937500) malloc: *** error for object 0x3c0ebc0: double free *** set a breakpoint in malloc_error_break to debug 2010-04-11 01:32:12.270 nbTxt[5952:207] 5122,Rob S.,5122,NB010203 The NSLog values i am sending is the last line "5122,Rob S.,5122,NB010203" Any help would be great :o) David

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• How to resolve a NULL cString crash

  - by hanumanDev

  I'm getting a crash with the following encoding fix I'm trying to implement: // encoding fix NSString *correctStringTitle = [NSString stringWithCString:[[item objectForKey:@"main_tag"] cStringUsingEncoding:NSISOLatin1StringEncoding] encoding:NSUTF8StringEncoding]; cell.titleLabel.text = [correctStringTitle capitalizedString]; my crash log output states: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSString stringWithCString:encoding:]: NULL cString' thanks for any help

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• UIPickerView in UIAlertView?

  - by Kirill SIMAGIN

  Is it possible to put UIPickerView into UIAlertView?If yes, can you give an example?

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• UIWebView/MPMoviePlayerController and the "Done" button

  - by David Sowsy

  I am using the UIWebView to load both streaming audio and video. I have properly set up the UIWebView delegate and I am receiving webViewDidStartLoading and webViewFinishedLoading events perfectly. The webview launches a full screen window (likely a MPMoviePlayerController) Apple's MoviePlayer example gets the array of Windows to determine which window the moviePlayerWindow is for adding custom drawing/getting at the GUI components. I believe this to be a bad practice/hack. My expectation is that I should be able to figure out when that button was clicked by either a delegate method or an NSNotification. It may also be the case that I have to poke around subviews or controllers with isKindOf calls, but I don't think those are correct approaches. Are my expectations incorrect, and if so, why? What is the correct way to bind an action to that "Done" button?

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• object cannot be set - either read-only property or no setter found

  - by Sheehan Alam

  I am having trouble over simply assigning a value to a UI Button: //Assume rect is defined rect = CGRectMake(13, 10, 48, 48); profileButton = [[UIButton alloc] initWithFrame:rect]; profileButton.buttonType = UIButtonTypeCustom; I am getting "object cannot be set - either read-only property or setter found" when trying to assign the buttonType to UIButtonTypeCustom.

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• Subview of custom NSView is resizing itself to fit within its superview

  - by Jonathan Patt

  I have a custom NSView which contains a subview—for the purposes of solving this issue, the top level view is simply acting as a container and automatically resizes to fit within the window. Its subview draws a rectangle 10 pixels inset from the edge of the window, except for the bottom, which should get clipped by the window until it's resized to show the entire rectangle. It does not, however, behave as I intend, and instead shrinks the height of the rectangle when its superview has a smaller height than it does. How do I avoid this and have it stay at its proper height and instead get clipped when the superview is smaller? The parent view's implementation code is: - (id)initWithFrame:(NSRect)frameRect { self = [super initWithFrame:frameRect]; if (self) { subView = [[SubView alloc] initWithFrame:frameRect]; } return self; } - (void)drawRect:(NSRect)dirtyRect { [[NSColor grayColor] set]; [subView setFrame:NSMakeRect(10, 10, dirtyRect.size.width - 20, 500)]; [self addSubview:subView]; } - (BOOL)isFlipped { return YES; } And the subview is just: - (void)drawRect:(NSRect)dirtyRect { [[NSColor blackColor] set]; [NSBezierPath strokeRect:dirtyRect]; } - (BOOL)isFlipped { return YES; }

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• NSWindow does not respond to keystroke command-s

  - by wackazong

  Hello, it may pre very simple, but cannot find it: I have three windows in three separate NIBs in my application. One is opened when a new document is opened, the other two can be opened from the program's window menu. The problem is: two windows (in them the one that is opened at the beginning) accepts the normal keystroke as for example command-s for save, and the other one does not and gives a warning sound instead. I cannot figure out the difference between the two windows or their controllers. I know it will have to do with the responder chain, but I am left clueless. Any ideas? Thanks, wackazong

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• How to set the title of UIToolBar?

  - by Kelvin

  How can I set the title of UIToolBar such that it looks the same as the title in UINavigationBar? I tried to use a button with plain style, it looks ok, but it will be highlighted when I click on it... Is there any better way to set the title in the detail view of split view?

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• Using undecorated UiNavigationBar

  - by Nicsoft

  Hello, I would like to use UINavigationBar without decoration. I.e. I would like to create my own custom buttons and link those to the same actions (e.g. back) as the navigation items were linked to and have no bar presented at the top. I was told that one should use navigation bar even though graphically you should design the interaction yourself. How do I go about doing this? I am quite new to navigation bar to start with... If there is some tutorial you can direct me to it would be great (that is for using nav-bar without decoration). Thanks in advance! Regards, Niklas

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• Schedule timer with NSTimer makes the task run faster than expected

  - by Hoang Pham

  I schedule a timer with NSTimer's function in viewWillAppear as follows: minutesTimer = nil; minutesTimer = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:@selector(updateScrollViewItems) userInfo:NULL repeats:YES]; With this function call, I expect it to call the selector updateScrollViewItems every minute, but it does not, it update items faster than expected (around some seconds). What is the cause of this unexpected behavior?

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• strange MPMoviePlayer problem

  - by Rahul Vyas

  I am using mpmovieplayer in my application.I have a button for playing movie witch has an image of play.But when mpmovieplayer plays movie i can see that button on movie player's overlying controlls like when i pause movie i see my play button instead of movie player's default button.Also i have customized navigation bar and i can see that navbar when movie plays instead of default nav bar.I tried hiding button when playing movie but it didn't worked.Does Someone knows about this issue? also i am having cropping of video issues does someone knows about how to handle video orientation i mean i want full video in any orientation recorded video.Thanks

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• Problem compiling gnustep-gui-0.16.0 undefined reference to png_sizeof

  - by stefanB

  I'm trying to compile GNUstep on a linux box but gnustep-gui-0.16.0 package is failing. I downloaded GNUstep Startup stable 0.20.1 (http://wwwmain.gnustep.org/resources/downloads.php)and follow instructions about how to compile (./configure && make). I'm getting this error: libgnustep-gui.so: undefined reference to 'png_sizeof' I have compiled latest libpng (1.2.34) and I can see that png_sizeof is defined as macro. However, I'm not quite sure how to fix the gnustep-gui-0.16.0 build. I tried to pass the include/lib directory where libpng is installed to configure build but nothing seems to help. I have quite up to date linux box but using gcc 3.3 (upgrade is not an option - but this should not be a problem). Full error: Making all for tool set_show_service... Compiling file set_show_service.m ... Linking tool set_show_service ... ../Source/./obj/libgnustep-gui.so: undefined reference to `png_sizeof' collect2: ld returned 1 exit status gmake[3]: *** [obj/set_show_service] Error 1 gmake[2]: *** [set_show_service.all.tool.variables] Error 2 gmake[1]: *** [internal-all] Error 2 gmake[1]: Leaving directory `/home/bla/local/src/gnustep-startup-0.22.0/build/gnustep-gui-0.16.0' gmake[3]: *** [obj/set_show_service] Error 1 gmake[2]: *** [set_show_service.all.tool.variables] Error 2 gmake[1]: *** [internal-all] Error 2 Any suggestions? Thanks

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• iOS Efficiency File Saving Efficiency

  - by Guvvy Aba

  I was working on my iOS app and my goal is to save a file that I am receiving from the internet bit by bit. My current setup is that I have a NSMutableData object and I add a bit of data to it as I receive my file. After the last "packet" is received, I write the NSData to a file and the process is complete. I'm kind of worried that this isn't the ideal way to do it because of the limitations of RAM in a mobile device and it would be problematic to receive large files. My next thought was to implement a NSFileHandle so that as the file arrives, it would be saved to the disk, rather than the virtual memory. In terms of speed and efficiency, which method do you think will work decently on an iOS device. I am currently using the first, NSMutableData approach. Is it worth changing my app to use the NSFileHandle? Thanks in advance, Guvvy

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• how to crop an image using rectangale overlay and touch on iphone

  - by Amir

  Hey Everyone, I am looking for a good tutorial or sample code, that would show how to crop an image taking from iphone camera something in lines of http://www.defusion.org.uk/code/javascript-image-cropper-ui-using-prototype-scriptaculous/ but you would control the corners with your fingers any tip would be greatly appericated, as i am new to iphone dev. Thanks, Amir

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• How to I pass @selector as a parameter?

  - by erotsppa

  For the method [NSThread detachNewThreadSelector:@selector(method:) toTarget:self withObject:(id)SELECTOR]; How do I pass in a @selector? I tried casting it to (id) to make it compile but it crashes in runtime. More specifically, I have a method like this +(void)method1:(SEL)selector{ [NSThread detachNewThreadSelector:@selector(method2:) toTarget:self withObject:selector]; } it crashes, how do I pass in the selector without crashing? So that the new thread can call the selector when the thread is ready?

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• How to set the title as left alignment in the UIButton.

  - by Madan Mohan

  Hi Guys, I need to dispaly the email address from left side of a UIButton, But it is getting in the center. Is there any way to set the alignment to the left side of a UIButton. UIButton* emailBtn = [[UIButton alloc] initWithFrame:CGRectMake(5,30,250,height+15)]; emailBtn.backgroundColor=[UIColor clearColor]; [emailBtn setTitle:obj2.customerEmail forState:UIControlStateNormal]; emailBtn.titleLabel.font = [UIFont systemFontOfSize:12.5]; [emailBtn setTitleColor:[[[UIColor alloc]initWithRed:0.121 green:0.472 blue:0.823 alpha:1]autorelease] forState:UIControlStateNormal]; [emailBtn addTarget:self action:@selector(emailAction:) forControlEvents:UIControlEventTouchUpInside]; [elementView addSubview:emailBtn]; [emailBtn release]; Please help me. Thank You, Madan Mohan.

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