nskeyedarchiver

问题 I have a view with an UIImageView. It was loaded with either jpg or png image format. Says the jpg image version has a data size of 100k. I then used NSKeyedArchiver to save my view to a file. The size of the file is getting about 3MB. If I used the png version of the image, the archived file is still around 3MB. I then used zlib to compress the archived file. But it does not seem to have much effect. Anything I can do to get it back to close as much as possible the 100k area? BTW: If I used

问题 After I've unarchived an object with NSKeyedUnarchiver, I am able to use it like usual, but I am unable to re-archive it. When I try, it crashes. [NSKeyedArchiver archiveRootObject:unarchivedObject toFile:fileName]; I tried looking in the developer resources in apple but I haven't seen a thorough explination of proper usage of NSKeyedArchiver. Please Help. Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000023 Crashed Thread: 0 Dispatch queue:

问题 I've never used NSCoding before and I'm very confused about how it should be implemented. My current iPad app has a UIImageView (called "background") which is a property of my main view controller. "background" has a UIImage "image" property (obviously) and various subviews which are added by the user. The added subviews are my own custom subclasses of UIImageView. I need to be able to save the state of the "background" UIImageView so it can be restored with the same image and all the

问题 I have an array itemQtyArray which i am storing in SQLITE table As: NSData *toData = [NSKeyedArchiver archivedDataWithRootObject:self.itemQtyArray]; NSString *insertSQL = [NSString stringWithFormat: @"INSERT INTO ORDERTABLE(ITEMDESC,ITEMQTY)VALUES( \"%@\",\"%@\");",dataString2,toData]; and then i am retrieving as : const void *itemQty = sqlite3_column_text(statement, 2); NSInteger qtyBytes = sqlite3_column_bytes(statement, 2); NSData *data2 = [NSData dataWithBytes:itemQty length:qtyBytes];

问题 I'm working on a homework app that uses custom Assignment objects for each assignment. I am trying to store an NSMutableArray (casted to an NSArray via initWithArray:) in standardUserDefaults but I'm having trouble with saving and reloading the array. I have a table view from which you can choose to add a new assignment (which loads NewAssignmentViewController). When you save the assignment, it is pushed back to an array in AssigmentsViewController. And then you call it every time you load

问题 I have a class object like; BookEntity.h import <Cocoa/Cocoa.h> @interface BookEntity : NSObject<NSCoding> { NSString *name; NSString *surname; NSString *email; } @property(copy) NSString *name,*surname,*email; @end BookEntity.m #import "BookEntity.h" @implementation BookEntity @synthesize name,surname,email; - (void) encodeWithCoder: (NSCoder *)coder { [coder encodeObject: self forKey:@"appEntity"]; } - (id) initWithCoder: (NSCoder *)coder { if (self = [super init]) { self = [coder

问题 I'm trying a basic implementation of the NSCoding protocol in swift, but it seems I can't success to unarchive an object after it has been correctly archived. Here's my attempt import Cocoa class User: NSObject, NSCoding { var name: String init(name: String) { self.name = name } init(coder aDecoder: NSCoder!) { self.name = aDecoder.decodeObjectForKey("name") as String } func encodeWithCoder(aCoder: NSCoder!) { aCoder.encodeObject(name, forKey: "name") } } let user = User(name: "Gabriele") let

问题 When I use NSKeyedArchiver is the data that is written a *.plist, I have seen some examples where people have the output file down as *.txt or even without an extension at all? -(void)saveCore { NSMutableData *data = [[NSMutableData alloc] init]; NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]; [archiver encodeObject:reactorCore forKey:@"CORE"]; [archiver finishEncoding]; [data writeToFile:[self dataFilePath] atomically:YES]; [data release]; [archiver

问题 I have a FileHelper class where I've implemented 3 methods whose job is to write a Dictionary contents to a file. Those methods are: func storeDictionary(_ dictionary: Dictionary<String, String>, inFile fileName: String, atDirectory directory: String) -> Bool { let ext = "txt" let filePath = createFile(fileName, withExtension: ext, atDirectory: directory) /**** //If I use this method, file is created and dictionary is saved guard (dictionary as NSDictionary).write(to: filePath!, atomically:

问题 My goal is to stream images captured by AVCpatureInput from one iOS device to another via bonjour. Here is my current method: 1) Capture frame from video input - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { /*code to convert sampleBuffer into UIImage */ NSData * imageData = UIImageJPEGRepresentation(image,1.0); [connection sendImage:image]; } 2) Send over TCP connection (from http: