On Fri, May 18, 2018 at 12:26 PM, <john.macrae....@gmail.com> wrote: > Hello all. I am creating a custom exporter for FreeNAS > https://github.com/Maelos/freenas_exporter and am stuck on the conversion of > the string of bytes provided by the commands output to a float. Here is my > code, what I have tried, and my results: > > What I have tried and results (commented so you can try and see each > https://play.golang.org/p/sevfk7Nt2w4
> Attempt 1 = binary.LittleEndian.Uint64([]bytes) to math.Float64frombits You've got a 2 byte slice, but you need 8 bytes. You're getting an 'index out of range' because you need a slice of 8 bytes. > Attempt 3 = Bytes to bytes.Reader to binary.Read(slice of bytes, > binary.LittleEndian, floatVariableToFill) to error check You've got 2 bytes in your bytes.Reader and you're trying to read 8 bytes from it, this is why you get an error. A float64 is 8 bytes so you need at least 8 bytes in your bytes.Reader. > Attempt 2 = bytes to string, String to float (strconv) You are parsing the string "2\n" which isn't a string representation of a float. So that's not going to work. The fact that these bytes are ascii characters means that your other attempts don't make a lot of sense. The ascii value for the character '2' is 50 so even if your other attempts worked you'd get a float with 50 instead of the 2 you're expecting. If you do f, err := strconv.ParseFloat(strings.TrimSpace(string(text)), 64) you'll trim off the invalid '\n' and you'll just have a '2' that will parse correctly. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
