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  • displaying mac address in right format

    - by califguy
    Hi, I am obtaining the mac(hw) address of an interface using CWNetwork. Now OS X gives me this mac address in the xx:xx:xx:xx:xx:xx format. But if the first digit is 0, OS X will output the address as 4:aa:dd:ee:34:40, instead of 04:aa:dd:ee:34:40. Now I am trying to take this string 4:aa:dd:ee:34:40 and convert it to 04:aa:dd:ee:34:40 before displaying it. Any ideas ? APpreciate the help.

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  • Total Size of NSMutableArray object

    - by sj wengi
    Hi Folks, I've got an NSMutableArray that holds a bunch of objects, what I'm trying to figure out is how much memory is the array using. After looking at a couple of places I know about the sizeof call, and when I make it I get 32 bits (which is the size of the NSMutableArray object it self). Example code: NSMutableArray *temp = [[NSMutableArray alloc]init]; [temp addObject:objectxyz]; [temp addObject:objectabc]; [temp addObject:object123]; now I want to know the size :) Thanks, Sj

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  • Setting UITabBarItem title from UINavigationController?

    - by fuzzygoat
    I have setup a UITabBarController with two tabs, one is a simple UIViewController and the other is a UINavigationController using second UIViewController as its rootController to set up a UITableView. My question is with regard to naming the tabs (i.e. UITabBarItem) For the first tab (simple UIViewController) I have added the following (see below) to the controllers -init method. - (id)init { self = [super init]; if(self) { UITabBarItem *tabBarItem = [self tabBarItem]; [tabBarItem setTitle:@"ONE"]; } return self; } For the other tab I have added (see below) to the second controllers init (rootController). - (id)init { self = [super init]; if(self) { UITabBarItem *tabBarItem = [[self navigationController] tabBarItem]; [tabBarItem setTitle:@"TWO"]; } return self; } Am I setting the second tabBarItem title in the right place as currently it is not showing? EDIT: I can correctly set the UITabBarItem from within the AppDelegate when I first create the controllers, ready for adding to the UITabBarController. But I really wanted to do this in the individual controller -init methods for neatness. // UITabBarController UITabBarController *tempRoot = [[UITabBarController alloc] init]; [self setRootController:tempRoot]; [tempRoot release]; NSMutableArray *tabBarControllers = [[NSMutableArray alloc] init]; // UIViewController ONE MapController *mapController = [[MapController alloc] init]; [tabBarControllers addObject:mapController]; [mapController release]; // UITableView TWO TableController *rootTableController = [[TableController alloc] init]; UINavigationController *tempNavController = [[UINavigationController alloc] initWithRootViewController:rootTableController]; [rootTableController release]; [tabBarControllers addObject:tempNavController]; [tempNavController release]; [rootController setViewControllers:tabBarControllers]; [tabBarControllers release]; [window addSubview:[rootController view]]; [window makeKeyAndVisible];

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  • Finding user location before map loads

    - by 4thSpace
    I'm trying to find the user's location using: CLLocationCoordinate2D _location; CLLocation *userLoc = nil; if(appDelegate.clLocationManager.locationServicesEnabled){ userLoc = mapView.userLocation.location; _location = userLoc.coordinate; } The problem is that I haven't yet initialized the map so the above doesn't work. Is there a way to get the user's location without using mapkit? Or should I be using a different technique?

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  • Click event of a button which is subview of an image view in xcode

    - by Christina
    in my app i have an image view and above that i added an button.And also in button click event i am calling a method.But i am unable to click on the button .whenever i try to click the button then the row of the table vie win which my image view is present is selected .Is there any method from which i can get the click event of the button which is placed on the image view.I do not want to use UIbuttons for setting the images in place of image view .Also if i am adding button as a subview of the table view then the click event is working but when i change the subview to image view then i get unsatisfactory result.Please help. Thanks, Christy

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  • OSX launchctl programmatically as root

    - by Lukas1
    I'm trying to start samba service using launchctl from OSX app as root, but I get error status -60031. I can run without problems the command in Terminal: sudo launchctl load -F /System/Library/LaunchDaemons/com.apple.AppleFileServer.plist` In the objective-c code, I'm using (I know it's deprecated, but that really shouldn't be the issue here) AuthorizationExecuteWithPrivileges method. Here's the code: NSString *command = @"launchctl"; // Conversion of NSArray args to char** args here (not relevant part of the code) OSStatus authStatus = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, kAuthorizationFlagDefaults, &_authRef); if (authStatus != errAuthorizationSuccess) { NSLog(@"Failed to create application authorization: %d", (int)authStatus); return; } FILE* pipe = NULL; AuthorizationFlags flags = kAuthorizationFlagDefaults; AuthorizationItem right = {kAuthorizationRightExecute, 0, NULL, 0}; AuthorizationRights rights = {1, &right}; // Call AuthorizationCopyRights to determine or extend the allowable rights. OSStatus stat = AuthorizationCopyRights(_authRef, &rights, NULL, flags, NULL); if (stat != errAuthorizationSuccess) { NSLog(@"Copy Rights Unsuccessful: %d", (int)stat); return; } OSStatus status = AuthorizationExecuteWithPrivileges(_authRef, command.UTF8String, flags, args, &pipe); if (status != errAuthorizationSuccess) { NSLog(@"Error executing command %@ with status %d", command, status); } else { // some other stuff } I have also tried using different flags then kAuthorizationFlagDefaults, but that led to either the same problem or error code -60011 - invalid flags. What am I doing wrong here, please?

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  • Do I have to call release on an objective-c retain class variable when setting it to a new object?

    - by Andrew Arrow
    Say I have: @property (nonatomic,retain) NSString *foo; in some class. And I call: myclass.foo = [NSString stringWithString:@"string1"]; myclass.foo = [NSString stringWithString:@"string2"]; Should I have called [myclass.foo release] before setting it to "string2" to avoid a memory leak? Or the fact that nothing is pointing to the first "string1" object anymore is good enough? And in the dealloc method [foo release] will be called.

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  • simple CATextLayer scaling problem

    - by dersubtile
    I'm having a simple scaling problem with CATextLayer, but i just couldn't figure it out: I want the CATextLayer to proportionally grow in size with it's superlayer: if the superlayer's width is 300 the text size of CATextLayer should be 12 and if the supeview's width is 600 the text size should be 24. I couldn't find a working solution! Can you please give me a clue? Thanks, Julian.

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  • UITableView scrollable background , UITableViewCell transparency

    - by f0rz
    Hi! In my UITableView I have custom cells. My UITableView have a repeatable background myTableView.backgroundColor = [UIColor colorWithPatternImage: [UIImage imageNamed: @"backg.png"]]; I set my cells to have their background (clear); UIView *backView = [[[UIView alloc] initWithFrame:CGRectZero] autorelease]; backView.backgroundColor = [UIColor clearColor]; cell.backgroundView = backView; This makes the cell have the same background as the TableView.. Problem is; That seems that every cell loads myTableView.backgroundColor once again. And the background are not being repeatble as it should. I want to have the cells totally with no background at all, instead they loads up myTableView.backgroundColor once again. Here is one example. Can anyone help me?

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  • Fast (de)serialization on iPhone

    - by Jacob Kuypers
    I'm developing a game/engine for iPhone OS. It's the first time I'm using Objective-C. I made my own binary format for geometry data and for textures I'm focusing on PVRTC. That should be the optimal approach as far as speed and space are concerned. I really want to keep loading time to a minimum and - if possible - be able to save very fast as well. So now I'm trying to make my "Entity" stuff persistent without sacrificing performance. First I wanted to use NSKeyedArchiver. From what I've heard, it's not very fast. Also, what I want to serialize is mostly structs made of floats with some ints and strings, so there isn't really a need for all that "object graph" overhead. NSArchiver would have been more appropriate, but they kicked that off the iphone for some reason. So now I'm thinking about making my own serialization scheme again. Am I wrong in thinking that NSKeyedArchiver is slow (I only read that, haven't tested it myself)? If so, what's the best way to encode/decode structs (with no pointers, mostly floats) without sacrificing speed?

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  • Very simple test view in MonoTouch draws a line using Core Graphics but view content is not shown

    - by Krumelur
    Hi, I give up now on this very simple test I've been trying to run. I want to add a subview to my window which does nothing but draw a line from one corner of the iPhone's screen to the other and then, using touchesMoved() it is supposed to draw a line from the last to the current point. The issues: 1. Already the initial line is not visible. 2. When using Interface Builder, the initial line is visible, but drawRect() is never called, even if I call SetNeedsDisplay(). It can't be that hard...can somebody fix the code below to make it work? In main.cs in FinishedLaunching(): oView = new TestView(); oView.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight; oView.Frame = new System.Drawing.RectangleF(0, 0, 320, 480); window.AddSubview(oView); window.MakeKeyAndVisible (); The TestView.cs: using System; using MonoTouch.UIKit; using MonoTouch.CoreGraphics; using System.Drawing; using MonoTouch.CoreAnimation; using MonoTouch.Foundation; namespace Test { public class TestView : UIView { public TestView () : base() { } public override void DrawRect (RectangleF area, UIViewPrintFormatter formatter) { CGContext oContext = UIGraphics.GetCurrentContext(); oContext.SetStrokeColor(UIColor.Red.CGColor.Components); oContext.SetLineWidth(3.0f); this.oLastPoint.Y = UIScreen.MainScreen.ApplicationFrame.Size.Height - this.oLastPoint.Y; this.oCurrentPoint.Y = UIScreen.MainScreen.ApplicationFrame.Size.Height - this.oCurrentPoint.Y; oContext.StrokeLineSegments(new PointF[] {this.oLastPoint, this.oCurrentPoint }); oContext.Flush(); oContext.RestoreState(); Console.Out.WriteLine("Current X: {0}, Y: {1}", oCurrentPoint.X.ToString(), oCurrentPoint.Y.ToString()); Console.Out.WriteLine("Last X: {0}, Y: {1}", oLastPoint.X.ToString(), oLastPoint.Y.ToString()); } private PointF oCurrentPoint = new PointF(0, 0); private PointF oLastPoint = new PointF(320, 480); public override void TouchesMoved (MonoTouch.Foundation.NSSet touches, UIEvent evt) { base.TouchesMoved (touches, evt); UITouch oTouch = (UITouch)touches.AnyObject; this.oCurrentPoint = oTouch.LocationInView(this); this.oLastPoint = oTouch.PreviousLocationInView(this); this.SetNeedsDisplay(); } } }

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  • How can I delete video stored in the photo library ?

    - by srikanth rongali
    I have saved video in to the photo library. -(void)exportVideo:(id)sender { NSString *path = [DOCUMENTS_FOLDER stringByAppendingString:@"/air.mp4"]; NSLog(@"Path:%@", path); NSLog(@"Export Button CLicked"); UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError: contextInfo:), nil); } - (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo { NSLog(@"Finished saving video with error: %@", error); } Now I need to delete the video i have stored programmatically. How can I delete the video ? Are there any functions for it? Thank You.

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  • Get String Value from NSDictionary

    - by Matt S.
    I have the following code: NSMutableDictionary *jsonObj = [parser objectWithString:json_string error:nil]; NSString *test = [[[jsonObj objectForKey:@"questions"] valueForKey:@"owner"] valueForKey:key]; but what I get back is: ( 1a19f089a2bc4ee42bff1c102c6e89b8 ) The actual value is fine, but I get those parenthesis, which show up in my string. How can I get rid of them?

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  • If my application doesn't use a lot of memory, can I ignore viewDidUnload:?

    - by iPhoneToucher
    My iPhone app generally uses under 5MB of living memory and even in the most extreme conditions stays under 8MB. The iPhone 2G has 128MB of RAM and from what I've read an app should only expect to have 20-30MB to use. Given that I never expect to get anywhere near the memory limit, do I need to care about memory warnings and setting objects to nil in viewDidUnload:? The only way I see my app getting memory warnings is if something else on the phone is screwing with the memory, in which case the entire phone would be acting silly. I built my app without ever using viewDidUnload:, so there's more than a hundred classes that I'd need to inspect and add code to if I did need to implement it.

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  • iPhone UIImage number recognition

    - by Skeep
    Hi All, I have a small UIImage (jpg) with a single typed number. I want to be able to read the number with some kind of pattern recognition. I'm really not sure where to start, so any help would be appreciated. my initial idea was to compare this image with other images. For instance compare the image with that of a 1,2,3, etc until a match was found. That just seems slow and cumbersome and wondered if there was a better way to do it? Thanks

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  • Autorelease vs. Release

    - by Sheehan Alam
    Given the two scenarios, which code is best practice and why? Autorelease loginButton = [[[UIBarButtonItem alloc] initWithTitle:@"Login" style:UIBarButtonItemStylePlain target:self action:@selector(loginButtonClicked:)] autorelease]; self.navigationItem.rightBarButtonItem = loginButton; or Release loginButton = [[UIBarButtonItem alloc] initWithTitle:@"Login" style:UIBarButtonItemStylePlain target:self action:@selector(loginButtonClicked:)]; self.navigationItem.rightBarButtonItem = loginButton; [loginButton release];

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  • Global NSMutableArray doesn't seem to be holding values

    - by diatrevolo
    I have a Cocos2D iPhone application that requires a set of CGRects overlaid on an image to detect touches within them. "Data" below is a class that holds values parsed from an XML file. "delegateEntries" is a NSMutableArray that contains several "data" objects, pulled from another NSMutableArray called "entries" that lives in the application delegate. For some strange reason, I can get at these values without problems in the init function, but further down the class in question, I try to get at these values, and the application crashes without an error message (as an example, I put in the "ccTouchBegan" method which accessess this data through the "populateFieldsForTouchedItem" method. Can anyone see why these values would not be accessible from other methods? No objects get released until dealloc. Thanks in advance! @synthesize clicked, delegate, data, image, blurImage, normalImage, arrayOfRects, delegateEntries; - (id)initWithTexture:(CCTexture2D *)aTexture { if( (self=[super initWithTexture:aTexture] )) { arrayOfRects = [[NSMutableArray alloc] init]; delegateEntries = [[NSMutableArray alloc] init]; delegate = (InteractivePIAppDelegate *)[[UIApplication sharedApplication] delegate]; delegateEntries = [delegate entries]; data = [delegateEntries objectAtIndex:0]; NSLog(@"Assigning %@", [[delegateEntries objectAtIndex:0] backgroundImage]); NSLog(@"%@ is the string", [[data sections] objectAtIndex:0]); //CGRect rect; NSLog(@"Count of array is %i", [delegateEntries count]); //collect as many items as there are XML entries for(int i=0; i<[delegateEntries count]; i++) { if([[delegateEntries objectAtIndex:i] xPos]) { NSLog(@"Found %i items", i+1); [arrayOfRects addObject:[NSValue valueWithCGRect:CGRectMake([[[delegateEntries objectAtIndex:i] xPos] floatValue], [[[delegateEntries objectAtIndex:i] yPos] floatValue], [[[delegateEntries objectAtIndex:i] xBounds] floatValue], [[[delegateEntries objectAtIndex:i] yBounds] floatValue])]]; } else { NSLog(@"Nothing"); } } //remove the following once the NSMutableArray from above works (legacy) blurImage = [[NSString alloc] initWithString:[data backgroundBlur]]; NSLog(@"5"); normalImage = [[NSString alloc] initWithString:[data backgroundImage]]; clicked = NO; } return self; } And then: - (void)populateFieldsForTouchedItem:(TouchedRect)touchInfo { Data *touchDatum = [[Data alloc] init]; touchDatum = [[self delegateEntries] objectAtIndex:touchInfo.recordNumber]; NSLog(@"Assigning %@", [[[self delegateEntries] objectAtIndex:touchInfo.recordNumber] backgroundImage]); rect = [[arrayOfRects objectAtIndex:touchInfo.recordNumber] CGRectValue]; image = [[NSString alloc] initWithString:[[touchDatum sections] objectAtIndex:0]]; [touchDatum release]; } - (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event { TouchedRect touchInfo = [self containsTouchLocation:touch]; NSLog(@"Information pertains to %i", touchInfo.recordNumber); if ( !touchInfo.touched && !clicked ) { //needed since the touch location changes when zoomed NSLog(@"NOPE"); return NO; } [self populateFieldsForTouchedItem:touchInfo]; NSLog(@"YEP"); return YES; }

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  • Perform selector on paren NSOperation

    - by user326943
    I extend NSOperation (call it A) which contains NSOperationQueue for other NSOperations (which is another extended class different from A, call these operations B). When operation A is running (executing B operations) how do i call a specific function/method on operation A when certain event takes place on B operations? For example every operation B that finishes it calls a function on operation A returning itself? *Nested NSOperation and NSOperationQueue(s) Thanks

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  • UIButton does not respond to touch events after changing its position using setFrame

    - by Pranathi
    I have a view controller class (child) which extends from view controller class (parent). In the parent class's loadView() method I create a sub-view (named myButtonView) with two buttons (buttons are horizontally laid out in the subview) and add it to the main view. In the subclass I need to shift these two buttons up by 50pixels. So, I am shifting the buttonView by calling the setFrame method. This makes the buttons shift and render properly but they do not respond to touch events after this. Buttons work properly in the views of Parent class type. In the child class type view also, if I comment out the setFrame() call the buttons work properly. How can I shift the buttons and still make them respond to touch events? Any help is appreciated. Following is snippets of the code. In the parent class: - (void)loadView { // Some code... CGRect buttonFrameRect = CGRectMake(0,yOffset+1,screenRect.size.width,KButtonViewHeight); myButtonView = [[UIView alloc]initWithFrame:buttonFrameRect]; myButtonView.backgroundColor = [UIColor clearColor]; [self.view addSubview:myButtonView]; // some code... CGRect nxtButtonRect = CGRectMake(screenRect.size.width - 110, 5, 100, 40); myNxtButton = [UIButton buttonWithType:UIButtonTypeCustom]; [myNxtButton setTitle:@"Submit" forState:UIControlStateNormal]; myNxtButton.frame = nxtButtonRect; myNxtButton.backgroundColor = [UIColor clearColor]; [myNxtButton addTarget:self action:@selector(nextButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; [myButtonView addSubview:myNxtButton]; CGRect backButtonRect = CGRectMake(10, 5, 100, 40); myBackButton = [UIButton buttonWithType:UIButtonTypeCustom]; [myBackButton setTitle:@"Back" forState:UIControlStateNormal]; myBackButton.frame = backButtonRect; myBackButton.backgroundColor = [UIColor clearColor]; [myBackButton addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; [myButtonView addSubview:myBackButton]; // Some code... } In the child class: - (void)loadView { [super loadView]; //Some code .. CGRect buttonViewRect = myButtonView.frame; buttonViewRect.origin.y = yOffset; // This is basically original yOffset + 50 [myButtonView setFrame:buttonViewRect]; yOffset += KButtonViewHeight; // Add some other view below myButtonView .. }

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  • very strange thread error message

    - by John Smith
    I an trying to put a method in a separate thread in the background. It nearly works except that occasionally I get a lot of error messages with the message METHODCLOSURE: OH NO SEPERATE THREAD with the bad spelling and all. Does anyone know what this means?

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