NSData *btsData = [in_str dataUsingEncoding:NSUTF8StringEncoding];
Byte *byteData = (Byte*)malloc(len);
memcpy(byteData, [btsData bytes], len);
NSMutableData *bts2Data = [NSMutableDatadataWithLength:len];
[bts2Data initWithBytes:byteData length:len];