[英]Convert float64 to byte array
How can I convert a float64 variable to big endian encoded byte array? 如何将float64变量转换为big endian编码的字节数组?
var f float64 = 12.666512
var result []byte = float64ToByte(f);
fmt.Printf("result:%f",result)
For the sake of clarity how should I implement float64ToByte
function in the following playground? 为了清楚起见,我应该如何在以下操场中实现
float64ToByte
函数?
https://play.golang.org/p/LevxCDd7mK https://play.golang.org/p/LevxCDd7mK
Use math.Float64bits to get the float64
as a uint64
. 使用math.Float64bits将
float64
作为uint64
。 Use shifting and conversions on the uint64
to convert to a desired sequence of bytes. 使用
uint64
上的移位和转换转换为所需的字节序列。 For example, here's how to encode a float in big endian order: 例如,以下是如何以大端顺序编码浮点数:
var buf [8]byte
n := math.Float64bits(f)
buf[0] = byte(n >> 56)
buf[1] = byte(n >> 48)
buf[2] = byte(n >> 40)
buf[3] = byte(n >> 32)
buf[4] = byte(n >> 24)
buf[5] = byte(n >> 16)
buf[6] = byte(n >> 8)
buf[7] = byte(n)
You can use the encoding/binary to convert the uint64
to bytes instead of writing out the shifts and conversions directly. 您可以使用encoding / binary将
uint64
转换为字节,而不是直接写出移位和转换。 Here's how to encode the float64
in big endian order using that package: 以下是使用该包以大端顺序编码
float64
方法:
var buf [8]byte
binary.BigEndian.PutUint64(buf[:], math.Float64bits(f))
The little endian code is: 小端代码是:
var buf [8]byte
binary.LittleEndian.PutUint64(buf[:], math.Float64bits(f))
Here's the big endian implementation of the float64ToByte
function in the question: 这是问题中
float64ToByte
函数的big endian实现:
func float64ToByte(f float64) []byte {
var buf [8]byte
binary.BigEndian.PutUint64(buf[:], math.Float64bits(f))
return buf[:]
}
You can use binary.Write()
from package "encoding/binary"
: 您可以使用包
"encoding/binary"
binary.Write()
:
func float64ToByte(f float64) []byte {
var buf bytes.Buffer
err := binary.Write(&buf, binary.BigEndian, f)
if err != nil {
fmt.Println("binary.Write failed:", err)
}
return buf.Bytes()
}
https://play.golang.org/p/XcvM5eaGtU https://play.golang.org/p/XcvM5eaGtU
https://play.golang.org/p/FO32EmWfjbL https://play.golang.org/p/FO32EmWfjbL
On my system it had to be little endianed: 在我的系统上,它必须是小结束:
func float64ToByte(f float64) []byte {
var buf bytes.Buffer
err := binary.Write(&buf, binary.LittleEndian, f)
if err != nil {
fmt.Println("binary.Write failed:", err)
}
return buf.Bytes()
}
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