How do I convert an NSString
value to NSData
?
This question is related to
ios
objective-c
nsstring
nsdata
In case of Swift Developer coming here,
to convert from NSString / String to NSData
var _nsdata = _nsstring.dataUsingEncoding(NSUTF8StringEncoding)
NSString* str = @"teststring";
NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding];
Objective-C:
NSString *str = @"test string";
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:str];
NSString *thatStr = [NSKeyedUnarchiver unarchiveObjectWithData:data];
Swift:
let str = "test string"
let data = NSKeyedArchiver.archivedData(withRootObject: str)
let thatStr = NSKeyedUnarchiver.unarchiveObject(with: data) as! String
Do:
NSData *data = [yourString dataUsingEncoding:NSUTF8StringEncoding];
then feel free to proceed with NSJSONSerialization:JSONObjectWithData
.
Following the comments, official documentation, and verifications, this answer was updated regarding the removal of an alleged NULL terminator:
As documented by dataUsingEncoding::
Return Value
The result of invoking
dataUsingEncoding:allowLossyConversion:
with NO as the second argument
As documented by getCString:maxLength:encoding: and cStringUsingEncoding::
note that the data returned by
dataUsingEncoding:allowLossyConversion:
is not a strict C-string since it does not have a NULL terminator
Objective-C:
NSString to NSData:
NSString* str= @"string";
NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];
NSData to NSString:
NSString* newStr = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding];
Swift:
String to Data:
var testString = "string"
var somedata = testString.data(using: String.Encoding.utf8)
Data to String:
var backToString = String(data: somedata!, encoding: String.Encoding.utf8) as String!
NSString *str = @"helowrld";
// This converts the string to an NSData object
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
you can take reference from this link
Objective-C
NSString *str = @"Hello World";
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:NO];
Swift
let str = "Hello World"
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: false)
For Swift 3, you will mostly be converting from String
to Data
.
let myString = "test"
let myData = myString.data(using: .utf8)
print(myData) // Optional(Data)
NSString *str = @"Banana";
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:true];
NSString *str = @"hello";
NSData *data = [NSData dataWithBytes:str.UTF8String length:str.length];
First off, you should use dataUsingEncoding:
instead of going through UTF8String
. You only use UTF8String
when you need a C
string in that encoding.
Then, for UTF-16
, just pass NSUnicodeStringEncoding
instead of NSUTF8StringEncoding
in your dataUsingEncoding:
message.
Source: Stackoverflow.com