一、NSString和NSData转换
1. NSString转NSData
NSString * str =@"str";
NSData *data =[str dataUsingEncoding:NSUTF8StringEncoding];
2.NSData 转NSString
NSString * str =[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
3.data 转char
NSData *data;
char * haha=[data bytes];
4. char 转data
byte * byteData = malloc(sizeof(byte)*16);
NSData *content=[NSData dataWithBytes:byteData length:16];
二、NSDictionary和NSData转换
1.NSDictionary转NSData
NSData *data= [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];
2.NSData转NSDictionary
NSDictionary*dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
