NSData與其它類型的轉換

NSString轉換成NSData對象

NSData *xmlData = [@"testdata" dataUsingEncoding:NSUTF8StringEncoding];

NSData轉換成NSString對象

NSData *data;

NSString *result = [NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

NSData轉換成Char*

NSData *data;

char *test = [data bytes];

Char*轉換成NSData

byte *tempData = malloc(sizeof(byte)*16);

NSData *content = [NSData dataWithBytes:tempData length:16];