在GoLang中将int64的Slice转换为字节数组，反之亦然

I need to convert a slice of int64 to a byte array in golang. I am successfully able to do so for a single int64

var p int64 = -3984171602573983744
fmt.Println(p)
cn := make([]byte, 8)
binary.LittleEndian.PutUint64(cn, uint64(p))
fmt.Println(cn)

How can I implement it for a slice of int64?

To be more precise, I am trying to call a function in a library which writes to a DB, and that function takes a byte array as a param. I have a slice of int64 which I need to convert to a byte array and vice versa. Is this possible?

For each of the int64's loop and store it like binary.LittleEndian.PutUint64(cn[x:], yourUint64), where x becomes 0,8,16...as you loop. Your cn should be big enough to take all the data (it'll be some multiple of 8). When you want to read, do the reverse: x1 := binary.LittleEndian.Uint64(cn[n:n+8]), where n becomes 0, 1, 2..

See https://play.golang.org/p/YVQOAG8-Xlm for a simpler muxing-demuxing example.

For example,

package main

import (
    "bytes"
    "encoding/binary"
    "fmt"
    "math"
)

func main() {

    w64 := []int64{math.MinInt64, -1, 0, 1, math.MaxInt64}
    fmt.Println(w64)

    // Write []int64 to database []byte
    wbuf := new(bytes.Buffer)
    err := binary.Write(wbuf, binary.LittleEndian, w64)
    if err != nil {
        fmt.Println("binary.Write failed:", err)
    }
    db := wbuf.Bytes()
    fmt.Printf("% x
", db)

    // Read database []byte to []int64
    rbuf := bytes.NewBuffer(db)
    r64 := make([]int64, (len(db)+7)/8)
    err = binary.Read(rbuf, binary.LittleEndian, &r64)
    if err != nil {
        fmt.Println("binary.Read failed:", err)
    }
    fmt.Println(r64)
}

Playground: https://play.golang.org/p/4OscSOGZE52

Output:

[-9223372036854775808 -1 0 1 9223372036854775807]
00 00 00 00 00 00 00 80 ff ff ff ff ff ff ff ff 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ff ff ff ff ff ff ff 7f
[-9223372036854775808 -1 0 1 9223372036854775807]