how can i convert a float64 to a []uint8

[Sven Lange]

hi there!

i want to send a value over the network via websocket.

the value is float64 and must be converted to []uint8 .

could someone pls help me. i am stuck at the moment.

thx
s

conversion

[Florian Weimer]

* Sven Lange:

> i want to send a value over the network via websocket.
>
> the value is float64 and must be converted to []uint8 .

You can access the bit pattern using math.Float64bits().

[Sven Lange]

i found a nice way to convert a float64 to a []byte or []uint8

there is the package strconv that is a good helper.

value := math.Sin(3.) // this is my float64 value
msg := strconv.Ftoa64(value, 'g', 10) // conversion to string
out := []byte(msg) // conversion to []byte // final conversion to []byte

[Henry Heikkinen]

binary.LittleEndian.PutUint64(yourByteSlice[0:8],
math.Float64bits(yourFloat64))

Change LittleEndian to BigEndian if needed. I'm using this in my
network packet construction package.

[John Asmuth]

theBytes := *(*[8]byte)(unsafe.Pointer(&theFloat64))
theBytes := *(*[4]byte)(unsafe.Pointer(&theFloat32))

[Lars Pensjö]

Using the package json is nice, except that data is encoded in ASCII and so may use more bandwidth.

You may also consider to convert the value into fixed point, depending on what your requirements are on precision and range.