如果数据不包含null-terminated(‘\0’)
NSString* newStr = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding];
否则
NSString* newStr = [NSString stringWithUTF8String:[theData bytes]];
如果数据不包含null-terminated(‘\0’)
NSString* newStr = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding];
否则
NSString* newStr = [NSString stringWithUTF8String:[theData bytes]];