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  • I just don't get AudioFileReadPackets

    - by Eric Christensen
    I've tried to write the smallest chunk of code to narrow down a problem. It's now just a few lines and it doesn't work, which makes it pretty clear that I have a fundamental misunderstanding of how to use AudioFileReadPackets. I've read the docs and other examples online, and apparently I'm just not getting. Could you explain it to me? Here's what this block should do: I've previously opened a file. I want to read just one packet - the first one of the file - and then print it. But it crashes on the AudioFileReadPackets line: AudioFileID mAudioFile2; AudioFileOpenURL (audioFileURL, 0x01, 0, &mAudioFile2); UInt32 *audioData2 = (UInt32 *)malloc(sizeof(UInt32) * 1); AudioFileReadPackets(mAudioFile2, false, NULL, NULL, 0, (UInt32*)1, audioData2); NSLog(@"first packet:%i",audioData2[0]); (For clarity, I've stripped out all error handling.) It's the AFRP line that crashes out. (I understand that the third and fourth argument are useful, and in my "real" code, I use them, but they're not required, right? So NULL in this case should work, right?) So then what's going on? Any guidance would be much appreciated. Thanks.

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  • remove an ASIHTTPRequest thread when it is done

    - by user262325
    Hello everyone I have a project in which it runs 5 download threads - (void)fetchThisURLFiveTimes:(NSURL *)url { [myProgressIndicator setProgress:0]; NSLog(@"Value: %f", [myProgressIndicator progress]); [myQueue cancelAllOperations]; [myQueue setDownloadProgressDelegate:myProgressIndicator]; [myQueue setDelegate:self]; [myQueue setRequestDidFinishSelector:@selector(queueComplete:)]; int i; for (i=0; i<5; i++) { ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; [request setDidFinishSelector:@selector(requestDone:)]; [request setDelegate:self]; [myQueue addOperation:request]; } [myQueue go]; } - (void)requestWentDone:(ASIHTTPRequest *)request { //.. } - (void)queueComplete:(ASINetworkQueue *)queue { NSLog(@"Value: %f", [myProgressIndicator progress]); } I hope to remove a thread when it is done. I do not know where I need to place my codes: requestWentDone:(ASIHTTPRequest *)request or queueComplete:(ASINetworkQueue *)queue I noticed there is no tag property for request, so I added it to ASIHTTPRequest to help me recognize which thread prompts the function reuqestWentDone, I can get the tag of different request, but I do not know how to remove the ASIHTTPRequest thread from myQueue. Welcome any comment Thanks interdev

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  • Building a clip area in a UIView from path objects in its subviews

    - by hkatz
    I'm trying to produce a clipping area in a UIView that's generated from path objects in its subviews. For example, I might have one subview containing a square and another containing a circle. I want to be able to produce a clip in the parent superview that's the union of both these shapes. Can someone explain how to do this? About all I've been able to figure out so far is that: 1 - the superview's drawRect: method is called before its subviews' drawRects are, and 2 - the ContextRef that's accessible in all three instances is the same. Other than that I'm stumped. Thanks, Howard

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  • Send custom headers with UIWebView loadRequest

    - by Thomas Clayson
    I want to be able to send some extra headers with my UIWebView loadRequest method. I have tried: NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.reliply.org/tools/requestheaders.php"]]; [req addValue:@"hello" forHTTPHeaderField:@"aHeader"]; [self.theWebView loadRequest:req]; I have also tried subclassing the UIWebView and intercepting the - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType method. In that method I had a block of code which looked like this: NSMutableURLRequest *newRequest = [request mutableCopy]; for(NSString *key in [customHeaders allKeys]) { [newRequest setValue:[customHeaders valueForKey:key] forHTTPHeaderField:key]; } [self loadRequest:newRequest]; But for some unknown reason it was causing the web view to not load anything (blank frame) and the error message NSURLErrorCancelled (-999) comes up (all known fixes don't fix it for me). So I am at a loss as to what to do. How can I send a custom header along with a UIWebView request? Many thanks!

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  • Problem in cropping the UIImage using CGContext?

    - by Rajendra Bhole
    Hi, I developing the simple UIApplication in which i want to crop the UIImage (in .jpg format) with help of CGContext. The developed code till now as follows, CGImageRef graphicOriginalImage = [originalImage.image CGImage]; UIGraphicsBeginImageContext(originalImage.image.size); CGContextRef ctx = UIGraphicsGetCurrentContext(); CGBitmapContextCreateImage(graphicOriginalImage); CGFloat fltW = originalImage.image.size.width; CGFloat fltH = originalImage.image.size.height; CGFloat X = round(fltW/4); CGFloat Y =round(fltH/4); CGFloat width = round(X + (fltW/2)); CGFloat height = round(Y + (fltH/2)); CGContextTranslateCTM(ctx, 0, image.size.height); CGContextScaleCTM(ctx, 1.0, -1.0); CGRect rect = CGRectMake(X,Y ,width ,height); CGContextDrawImage(ctx, rect, graphicOriginalImage); croppedImage = UIGraphicsGetImageFromCurrentImageContext(); return croppedImage; } The above code is worked fine but it can't crop image. The original image memory and cropped image memory i will got same(equal to original image memory). The above code is right for cropping the image?????????????????? How i cropping the image (in behind pixels should also be crop) from the center of the image???????????? I already wasting a lot of time for developing the above code , but i didn't get answer or way to find out how to crop the image.Thanks for sending me answer in advanced.

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  • How do I properly handle rotation of a UIScrollView containing UIImageViews?

    - by bpapa
    I'm developing an image viewer, much like the Photos App. It's a UIScrollView with paging enabled with images loaded from the internet, so I've adapted portions of the LazyTableImages sample. The Scroll View and each ImageView inside of it have all of their autoresize mask flags set. When I first observed how resizes were happening during rotation, it looked good, but once I started trying to interact with the scroll view, I realized that I also had to programmatically change the size of the contentView. I did that by implementing didRotateFromInterfaceOrientation: in my view controller. [self.scrollView setContentSize:CGSizeMake(numberOfImages * portraitWidth, [scrollView bounds].size.height)]; With interaction behaving properly, I then discovered that, if I was viewing the second photo and rotated, portions of both the 1st and 2nd photos would be shown on the screen. I needed to change the contentOffset as well. I've tried to fix this two ways - both by using the scrollRectToVisible:animated: method of UIScrollView, as well as trying to set the contentOffset property directly. And I've experimented by putting this code in implementations of both the "one-step" and "two-step" responses to changes in Orientation. For example: -(void)didAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation { [self.scrollView setContentOffset:CGPointMake(currentlyViewedPhotoIndex * largeImageHeight,0) animated:YES]; In all cases though, it just looks janky as hell. Either I clearly see the scroll happen, or it just jumps. Uuuuuuuuuuugly! Is there a way to do this so that it behaves exactly like the Photos app does?

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  • When should you NOT use the asterisk (*) when declaring a variable in Objective C

    - by Jason
    I have just started learning objective c and the asterisk is giving me some trouble. As I look through sample code, sometime it is used when declaring a variable and sometimes it is not. What are the "rules" for when it should be used. I thought it had something to do with the data type of the variable. (asterisk needed for object data types, not needed for simple data types like int) However, I have seen object data types such as CGPoint declared without the asterisk as well? Is there a definitive answer or does it have to do with how and what you use the variable for?

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  • CALayer drawInContext vs addSublayer

    - by Michael
    How can I use both of these in the same UIView correctly? I have one custom subclassed CALayer in which I draw a pattern within drawInContext I have a another in which I set an overlay PNG image as the contents. I have a third which is just a background. How do I overlay all 3 of these items? [self.layer addSublayer:bottomLayer]; // this line is the problem [squaresLayer drawInContext:viewContext]; [self.layer addSublayer:imgLayer]; The other 2 by themselves draw correctly if I do them in that order. No matter where I try and put bottomLayer, it always prevents squaresLayer from drawing. The reason I need 3 layers is I intend to animate the colors in the background and custom layers. The top layer is just a graphical overlay.

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  • Receiving Error Domain=kCFErrorDomainCFNetwork Code=2 when attempting to read from ReadStream

    - by theactiveactor
    I'm attempting to synchronously read from a CFReadStream objected created by CFStreamCreatePairWithSocketToHost. The stream opened fine but when I attempt to invoke CFReadStreamRead on it in a loop, CFReadStreamRead() returns -1 and the resulting error is: Error Domain=kCFErrorDomainCFNetwork Code=2 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)" UserInfo=0x14a920 {kCFGetAddrInfoFailureKey=8} I'm also receiving this same exact error when using this ReadStream asynchronously- the first callback I receive is this error.

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  • Custom view with nib as subview doesn't seem to be loading

    - by Ben Collins
    I've created a custom view that loads its content from a nib, like this: /* PricingDataView.h */ #import <UIKit/UIKIt.h> @interface PricingDataView : UIView { UIView *contentView; } @property (nonatomic, retain) IBOutlet UIView *contentView; @end /* PricingDataView.m */ #import "PricingDataView.h" @implementation PricingDataView @synthesize contentView; - (id)initWithFrame:(CGRect)frame { if ((self = [super initWithFrame:frame])) { [[NSBundle mainBundle] loadNibNamed:@"PricingDataView" owner:self options:nil]; [contentView setFrame:frame]; [self addSubview:contentView]; } return self; } /* ... */ In the nib file I set PricingDataView as the type of the File's Owner, and connected the contentView outlet in IB. I placed a regular UIView from the Interface Library onto the full-sized view shown to the user, and then changed it's class name to PricingDataView. It all builds, but at runtime, nothing is rendered where my custom view is supposed to be. I put breakpoints in PricingDataView.initWithFrame, but they don't hit, so I know I'm missing something that would cause the view to be initialized. What I'm curious about is that int the process of loading my other views from nibs, all the initialization happens for me, but not with this one. Why?

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  • Lazy load pages in UIScrollView

    - by jean
    I have a UIScrollView that contains large images and am using paging to scroll between images. In order to save memory, I am loading only one image before and after the currently visible one and loading/releasing new images after a scroll has completed. The problem occurs when one scrolls quickly and scrollViewDidEndDecelerating is not called. How can I detect continuous scrolling? I could check item location on every scrollViewDidScroll but this seems a bit heavy...

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  • Outputing struct to NSLog for debugging?

    - by fuzzygoat
    I am just curious, is there a way to print via NSLog the contents of a struct? id <MKAnnotation> mp = [annotationView annotation]; MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate], 350, 350); I am trying to output whats in [mp coordinate] for debugging. . EDIT_001: I cracked it, well unless there is another way. id <MKAnnotation> mp = [annotationView annotation]; CLLocationCoordinate2D location = [mp coordinate]; NSLog(@"LAT: %f LON: %f", location.latitude, location.longitude); many thanks gary

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  • setDelegate:self, how does it work?

    - by fuzzygoat
    I have a query regarding how delegates work. My understanding was that delegates take responsibility for doing certain tasks on behalf of another object. locationManager = [[CLLocationManager alloc] init]; [locationManager setDelegate:self]; [locationManager setDistanceFilter:kCLDistanceFilterNone]; [locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; [locationManager startUpdatingLocation]; Am I right in thinking that in the example code above that the instance of CLLocationManager is created on a new thread so that it can get on with trying to find the location information it needs. When it completes its task (or encounters an error) it calls-back using the appropriate methods located in self e.g. locationManager:didUpdateToLocation:fromLocation: Essentially locationManager sends messages to self (which conforms to the correct delegate protocol) when things happen cheers gary

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  • How to handle "mutating method sent to immutable object" exception?

    - by Madan Mohan
    I am having a class called Customer. Customer *object; //in this object i have the following data varialbles. object.customerName object.customerAddress object.customerContactList I declared customerContactList as NSMutableArray and also allocated and initialized. Now I am adding or deleting from contactList. //Adding. [object.customerContactList addObject:editcontacts];// here editcontacts one of the object in contactList. //Deleting. [object.customerContactList removeObjectAtIndex:indexPath.row]; [theTableView deleteSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:UITableViewRowAnimationFade]; I am getting exception even it is NSMutableArray. Please help me. Thank You, Madan Mohan

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  • UIScrollView strange zoom behavior when content is a UIView subclass

    - by sigsegv
    Hi, I'm experiencing the following: I created a UIView subclass with a CATiledLayer as backing layer by overriding the layerClass method. The layer properties (delegate, tileSize, etc) are set in the initWithFrame: method of the subclass. +(Class)layerClass { return [CATiledLayer class]; } -(id)initWithFrame:(CGRect)frame { if(self = [super initWithFrame:frame]) { renderer = [[MFPDFRenderer alloc]init]; tiledLayer = (CATiledLayer *)[self layer]; [tiledLayer setFrame:frame]; [tiledLayer setLevelsOfDetail:2]; [tiledLayer setLevelsOfDetailBias:3]; [tiledLayer setTileSize:CGSizeMake(512, 512)]; [tiledLayer setDelegate:renderer]; } return self; } Then I add an instance of said class as the content of an UIScrollView and set UIScrollView properties and implement the required delegate's methods. Everything works fine but when zooming the scroll view keep repositioning itself on its center. It's hardly noticeable when zooming in the center of the content, but unbearable otherwise. The same scroll view works fine when I use as (zoomable) content any other view such as an UIImageView or even a normal UIView with a CATiledLayer with the same properties and delegate of the subclass implementation as sublayer. When I check layer bounds and frame in the drawLayer:inContext: method of the delegate I get the following result as the zoom increase UIView with CATiledLayer as sublayer: 2010-04-03 21:05:33.499 Renderer[89293:4903] Layer: (0.000, 0.000) 320.000 x 460.000 2010-04-03 21:05:33.500 Renderer[89293:4903] Bounds: (0.000, 0.000) 320.000 x 460.000 2010-04-03 21:05:33.529 Renderer[89293:4903] Layer: (0.000, 0.000) 320.000 x 460.000 2010-04-03 21:05:33.534 Renderer[89293:4903] Bounds: (0.000, 0.000) 320.000 x 460.000 Custom subclass: 2010-04-03 21:04:15.969 Renderer[88957:4903] Layer: (0.000, 0.000) 657.910 x 945.746 2010-04-03 21:04:15.970 Renderer[88957:4903] Bounds: (0.000, 0.000) 320.000 x 460.000 2010-04-03 21:04:17.428 Renderer[88957:4903] Layer: (-0.000, 0.000) 766.964 x 1102.510 2010-04-03 21:04:17.429 Renderer[88957:4903] Bounds: (0.000, 0.000) 320.000 x 460.000 [...] 2010-04-03 21:19:10.388 Renderer[92573:4903] Layer: (-0.000, 0.000) 905.680 x 1301.916 2010-04-03 21:19:10.388 Renderer[92573:4903] Bounds: (0.000, 0.000) 320.000 x 460.000 I suppose that's the culprit or at least another symptom. I can add that I get the same erratic behavior if my subclass is built over a standard CALayer with the same renderer. Any suggestion will be appreciated!

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  • How to hide tabbar for some pages and make it visible again?

    - by priya
    I've got an application that uses a Tab Bar Controller along with a Navigation Controller.But for some pages I want to hide both bars(Tab & navigation) after that those will be visible again...I am able to hide navigation bar & also done with making. it appear after some pages. I am able to hide tab bar with - (BOOL)hidesBottomBarWhenPushed{ return TRUE; } But problem is how do I make it Visible again after some pages?

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  • How do those bitmasks actually work?

    - by mystify
    For example, this method from NSCalendar takes a bitmask: - (NSDate *)dateByAddingComponents:(NSDateComponents *)comps toDate:(NSDate *)date options:(NSUInteger)opts So options can be like: NSUInteger options = kCFCalendarUnitYear; or like: NSUInteger options = kCFCalendarUnitYear | kCFCalendarUnitMonth | kCFCalendarUnitDay; What I don't get is, how is this actually done? I mean: How can they pull out those values which are merged into options? If I wanted to program something like this, that can take a bitmask, how would that look?

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  • XCode: Block support disabled

    - by Nic Hubbard
    XCode is warning me that Blocks support is disabled, and to compile with -fblocks. I have added -fblocks to the Other Linker Flags section. But compiling again gives me the same error. I am using iOS4 GM. Any ideas on how to fix this?

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  • Core Data multi-threading

    - by JK
    My app starts by presenting a tableview whose datasource is a Core Data SQLite store. When the app starts, a secondary thread with its own store controller and context is created to obtain updates from the web for data in the store. However, any resulting changes to the store are not notified to the fetchedresults controller (I presume because it has its own coordinator) and consequently the table is not updated with store changes. What would be the most efficient way to refresh the context on the main thread? I am considering tracking the objectIDs of any objects changed on the secondary thread, sending those to the main thread when the secondary thread completes and invoking "[context refreshObject:....] Any help would be greatly appreciated.

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  • addSublayer vs addSubView which is more efficient?

    - by soonio
    I have 5 UIImageViews for displaying 5 images. For my app, I need swap the order of them depending on some events. I achieve this by calling: [anImageView1 removeFromSuperview]; [self.view insertSubview:anImageView1 aboveSubview:anImageView2]; Recently, I've come across a different method for doing this using 1 UIView and 5 UIImageViews. Each layer of UIImageViews are added to this UIView by calling [aView.layer addSublayer:anImageView1.layer]; [aView.layer addSublayer:anImageView2.layer]; etc. and then in order to swap the order of things by calling [anImageView1.layer removeFromSuperLayer]; [aView.layer insertSublayer:anImageView1 above: anImageView2] Both methods work fine, but can someone please point out which method is better and why? I really can't seem to be able to find much on CALayer... Please help! Thank you so much!

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