nsdata

问题 Hi I am doing InApp purchase. Got the receipt data successfully and encoded with base64EncodedString and sent to our own server then our own server connected to apple server and the response was "Invalid Receipt".Then I added the secret key and encoded it again. Now receipt data is sent as "bytes".How to send the original receipt data to our server. func receiptValidation(productId:String,requestFrom:String) { let SUBSCRIPTION_SECRET = "My_Secret_Key" applicationDelegate.application=self var

问题 Hello everyone I'm working for the first time with SHA256 and I'm trying to follow a tutorial on this my problem is to write the equivalence in Objective C of SHA 256. I'm trying to understand the function that I show you below but I still have problems on how to find the equivalence in Objective C of this Swift function let rsa2048Asn1Header:[UInt8] = [ 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f,

问题 Hello everyone I'm working for the first time with SHA256 and I'm trying to follow a tutorial on this my problem is to write the equivalence in Objective C of SHA 256. I'm trying to understand the function that I show you below but I still have problems on how to find the equivalence in Objective C of this Swift function let rsa2048Asn1Header:[UInt8] = [ 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f,

问题 Hello everyone I'm working for the first time with SHA256 and I'm trying to follow a tutorial on this my problem is to write the equivalence in Objective C of SHA 256. I'm trying to understand the function that I show you below but I still have problems on how to find the equivalence in Objective C of this Swift function let rsa2048Asn1Header:[UInt8] = [ 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, 0x0f,

问题 I have one UIButton (lets say instance1 ).I have set target method when it moves.So when I try to move(drag) I want to do that create copy of instance1 and that copy button should be moved(dragged).Yes I know that -copy will not support to UIButton .So I used : NSData *archivedData = [NSKeyedArchiver archivedDataWithRootObject: sender]; UIButton *buttonCopy = [NSKeyedUnarchiver unarchiveObjectWithData: archivedData]; But the problem is when I am trying to move copy button,its not moving and

问题 I want to load data from a PHP page. Pretty simple stuff, I thought: test.php <?php echo "Hello World!"; ?> FirstViewController.m (IBAction from a button): NSString *stringURL = [NSString stringWithFormat:@"http://localhost/root/juraQuiz/test.php"]; NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:stringURL]]; NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"%@", result); It doesnt show anything, data is (null)... The URL is

问题 Swift offers both Data and [UInt8] types, which do a very similar thing. What are the differences between the two? When designing new API's, what's the preferred type? 回答1: [UInt8] is essentially a byte array, a byte (as I'm sure you know), is comprised of 8 bits. Whilst NSData isn't simply a byte array, deep down it's underlying structure is based off one. You can easily convert between them using methods such as data.bytes , for example. In terms of designing APIs, I would personally

问题 I have an NSData object which contains some data I need. What I wanted to do is to find out the position of data "FF D8" (start of JPEG data) How can I achieve work like this? 回答1: First get the range, then get the data: // The magic start data object is only created once safely and // then reused each time static NSData* magicStartData = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ static const uint8_t magic[] = { 0xff, 0xd8 }; magicStartData = [NSData

问题 How do we clear an NSMutableData without using release and then re-alloc/init again to be used again? I was looking at resetBytesInRange to be set at zero but I am unsure of this. Anyone can help? 回答1: If you want an empty buffer: [data setLength:0]; If you want to keep its size but set all the bytes to zero: [data resetBytesInRange:NSMakeRange(0, [data length])]; 回答2: Swift version of the setting all the bytes to zero: data.resetBytes(in: NSRange(location:0, length:data.length)) 来源： https:/

问题 I have this code, which should be working perfectly, but I can't udnerstand why it isn't: +(NSString *)writeImageToFile:(UIImage *)image { NSData *fullImageData = UIImageJPEGRepresentation(image, 1.0f); NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Images/"]; NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isDirectory = NO; BOOL directoryExists = [fileManager fileExistsAtPath:path isDirectory:&isDirectory]; if (directoryExists) { NSLog(@