nsdata

I have .Net web service response containing a byte[] entry, among other fields. The data is a PDF file. I extract the Dictionary from the received data with: [NSJSONSerialization JSONObjectWithData] Hereafter I use the following code to convert the byte[] to NSData. I then save the result to disk (see last line). When opening the resulting PDF file, I get the following error: "failed to find PDF header: `%PDF' not found." NSArray *byteArray = [rootDictionary objectForKey:@"file"]; unsigned c = byteArray.count; uint8_t *bytes = malloc(sizeof(*bytes) * c); unsigned i; for (i = 0; i < c; i++) {

My iOS application needs to store an MKPolyline inside of an NSUserDefault . I've been doing a lot of research, and I now know that: NSUserDefaults are a subclass of NSCoder MKPolyline is not a subclass of NSCoder As a result, it is rather difficult to save a polyline to nsuserdefaults . I have attempted to convert the MKPolyline into NSData: NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSData *data = [NSKeyedArchiver archivedDataWithRootObject:routeLine]; // routeLine is an MKPolyline [defaults dataForKey:@"key"]; [defaults synchronize]; When I try to convert the polyline

I'm going a bit crazy trying to archive and unarchive a UIImageView which has number of subviews which are custom views derived from UIImageView. Here's what I've done: Add a category to the project to allow for the fact that UIImage does not conform to NSCoding: #import "UIImage-NSCoding.h" #define kEncodingKey @"UIImage" @implementation UIImage(NSCoding) - (id)initWithCoder:(NSCoder *)decoder { if ((self = [super init])) { NSData *data = [decoder decodeObjectForKey:kEncodingKey]; self = [self initWithData:data]; } return self; } - (void)encodeWithCoder:(NSCoder *)encoder { NSData *data =

I have a problem with creating my own subclass of NSData , which I want to have a custom description method. Even creating a dummy NSData subclass: @interface MyData : NSData {} @end and @implementation MyData @end and using it results in weird bugs (the function that uses it never exits, and control somehow returns to the run loop). I thought that maybe I am responsible for rewriting the designated initializers of NSData (calling the super implementation), but none is mentioned in the doc. So: what are the designated initializers of NSData ? what is the bare minimum I need to write for a

Here are the code I tried to convert NSData to NSString but the program return "Program received signal:SIGABRT". NSString *string= [NSString stringWithUTF8String:[data bytes]]; OR NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; Is there any other better way to do it? danh Here's a highly up-voted answer that shows how to do it. In a nutshell: NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; The first idea looks like a fail because of sending [data bytes] . stringWithUTF8String isn't prepared for a void *. The second

I was trying to download a picture to my app from The request failed with the error NSURLErrorDomain and the code is really -1100. The url should be correct since I checked it in the browser. Anyone knows why? let userImageURL: String! = "http://i.imgur.com/QhCzQoR.jpg"; let url = NSURL(fileURLWithPath: userImageURL); let request:NSURLRequest = NSURLRequest(URL: url!) NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler: { (response:NSURLResponse!, imageData:NSData!, error:NSError!) -> Void in let image = UIImage(data: imageData!); }) The