Common usage of Nssdata in iOS

Source: Internet
Author: User

First, the concept of NSData

1, the use of the file needs to be frequently read into a temporary storage area, which is often called a buffer

2. The NSData class provides a simple way to set a buffer, read the contents of a file into a buffer, or write the contents of a buffer to a file.

3. NSData cache up to 2GB for 32-bit applications

4. We have two definitions of nsdata (immutable buffers), nsmutabledata (variable buffers)

NSData *filedata;    Nsfilemanager *filemanager = [[Nsfilemanager alloc]init];filedata = [FileManager Contentsatpath:path]; [FileManager createfileatpath:path2 contents:filedata Attributes:nil];   Take the default property value

  nsdata< Span style= "LINE-HEIGHT:34PX; font-size:14pt; " > ->  NSString< Span style= "LINE-HEIGHT:34PX; font-size:14pt; " >

NSString *strdata = [[NSString alloc]initwithdata:filedata encoding:nsasciistringencoding];

Type conversion nsstring- nsdata:

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