Get NSData lengh

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NSString *filePath = [[NSFileManager defaultManager] pathForRessorce: @"data" ofType:@"txt"];
NSData *data = [NSData dataWithContentsOfFile:filePath]; 
int len = [data length];

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NSData:

* NSData

* Create

* Get NSData lengh

* Encoding and decoding a string using NSData Base64

* NSData and Hexadecimal String

Table Of Contents

0 Getting started

1 Protocols

2 Blocks

3 Categories

4 Key Value Coding and observing

5 Logging

6 NSArray

7 Classes and objects

8 NSString

9 NSDictionary

10 NSDictionary

11 Low-level runtime environment

12 NSArray

13 NSURL

14 Methods

15 Error handling

16 Enums

17 NSData

18 Random numbers

19 Properties

20 NSDate

21 NSPredicate

22 NSMutableArray

23 NSRegularExpression

24 NSJSONSerialization

25 Memory management

26 Singletons

27 NSCalendar

28 NSMutableDictionary

29 Multi-threading

30 NSAttributedString

31 NSTimer

32 Structs

33 Subscripting

34 Basic data types

35 Unit testing using XCode

36 Fast enumeration

37 NSSortDescrip

38 Inheritance

39 NSTextAttachment

40 NSUrl send POST request

41 BOOL, bool, Boolean, NSCFBoolean

42 Protocols and delegates

43 XML Parsing

44 Declare class method and instance method

45 Predefined macros

46 NSCache

47 Grand Central Dispatch (GCD)

48 Continue and break

49 Format specifiers

50 NSObject

51 Modern Objective-C

52 NSUserDefaults

53 Contributors