yes, the example there is perfect: https://play.golang.org/p/QvPm90SUgiX
On Fri, May 18, 2018 at 7:44 PM Tashi Lu <dotslash...@gmail.com> wrote: > There is a function for this in the math lib Float64Frombits, a similar > question: > https://stackoverflow.com/questions/22491876/convert-byte-array-uint8-to-float64-in-golang > > On Friday, 18 May 2018 10:31:11 UTC+8, John Fox 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 >> Attempt 2 = bytes to string, String to float (strconv) >> Attempt 3 = Bytes to bytes.Reader to binary.Read(slice of bytes, >> binary.LittleEndian, floatVariableToFill) to error check >> >> Please let me know what more I can provide. I will keep hacking away at >> it tomorrow, but hoping I can get this done soon. Full go play write up >> below: >> >> package main >> >> >> import ( >> //You may need to edit these in or out depending upon the attempt >> "bytes" >> "encoding/binary" >> "fmt" >> //"strconv" >> //"math" >> ) >> >> >> func main() { >> >> >> // I have been able to test this part and I do get a return of "[50 >> 10]" which is correct (converts string "2" for 2 CPUs). The exact >> statement may be a bit different. >> // I am running the script on the latest FreeNAS whic his built from >> 11.1STABLE FreeBSD. I have Go installed and am building the files on the >> shell >> //numCPUCmd := exec.Command("bash", "-c","/usr/local/bin/ipmitool -I >> lanplus -H ipmiAddress -U ipmiUser -f /root/ipmi_password sdr elist all | >> grep -c -i \"cpu.*temp\"") >> //numCPUBytes, _ := numCPUCmd.Output() //returns a slice of bytes and >> an error >> >> >> >> >> // ATTEMPT 1 >> var flty float64 >> sob := []byte{50, 10} >> fmt.Printf("\n%T %v\n\n", sob, sob) >> >> >> buf := bytes.NewReader(sob) >> err := binary.Read(buf, binary.LittleEndian, &flty) >> if err != nil { >> fmt.Println("binary.Read failed:", err) >> } >> fmt.Println(flty) >> >> /*Result >> []uint8 [50 10] >> >> >> binary.Read failed: unexpected EOF >> 0 >> */ >> >> //////////////////////////////////////////////////////// >> //ATTEMPT 2 >> /* >> var f float64 >> text := []byte{50, 10} // A decimal value represented as Latin-1 text >> >> >> f, err := strconv.ParseFloat(string(text), 64) >> if err != nil { >> panic(err) >> } >> fmt.Println(f) >> */ >> /*Result >> panic: strconv.ParseFloat: parsing "2\n": invalid syntax >> >> >> goroutine 1 [running]: >> main.main() >> /tmp/sandbox657430918/main.go:44 +0x160 >> */ >> >> //////////////////////////////////////////////// >> //ATTEMPT3 >> /* >> sob := []byte{50, 10} >> bits := binary.LittleEndian.Uint64(sob) >> fmt.Printf("\n\n%T %v\n\n", bits, bits) >> >> >> flty := math.Float64frombits(bits) >> fmt.Printf("\n\n%T %v\n\n", flty, flty) >> >> >> inty := int(flty) >> fmt.Printf("\n\n%T %v\n\n", inty, inty) >> */ >> /* Result >> panic: runtime error: index out of range >> >> >> goroutine 1 [running]: >> encoding/binary.binary.littleEndian.Uint64(...) >> /usr/local/go/src/encoding/binary/binary.go:76 >> main.main() >> /tmp/sandbox742704811/main.go:62 +0x20 >> */ >> } >> >> -- > 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. > -- Michael T. Jones michael.jo...@gmail.com -- 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.
