IOS NSString and NSData conversions

1. String transfer to Data

NSString * str =@ "str";

nsdata *data =[str datausingencoding:nsutf8stringencoding];

2.NSData Turn NSString

< Span class= "hljs-string" >< Span class= "hljs-built_in" >< Span class= "hljs-built_in" >nsstring * str  =[[ nsstring alloc] initwithdata:data  Encoding:nsutf8stringencoding];

< Span class= "hljs-string" >< Span class= "hljs-built_in" >< Span class= "hljs-built_in" > 3. data  to char

< Span class= "hljs-string" >< Span class= "hljs-built_in" >< Span class= "hljs-built_in" > < Span class= "hljs-built_in" >nsdata *data; 

< Span class= "hljs-string" >< Span class= "hljs-built_in" >< Span class= "hljs-built_in" > < Span class= "hljs-built_in" > char * haha=[data bytes]; 

< Span class= "hljs-string" >< Span class= "hljs-built_in" >< Span class= "hljs-built_in" > < Span class= "hljs-built_in" > Span class= "hljs-comment" >4. char  to data 

byte * bytedata = malloc ( Span class= "Hljs-keyword" >sizeof (byte) * 16); 

< Span class= "hljs-built_in" > < Span class= "hljs-built_in" >< Span class= "hljs-comment" >nsdata *content=[nsdata datawithbytes:bytedata length: 16];

IOS NSString and NSData conversion