go - 在 GoLang 中将 int64 的 Slice 转换为字节数组，反之亦然

Question

我需要将一片 int64 转换为 golang 中的字节数组。我能够成功地为单个 int64 这样做

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

我如何为一片 int64 实现它？

更准确地说，我正在尝试调用库中写入数据库的函数，该函数将字节数组作为参数。我有一片 int64，我需要将其转换为字节数组，反之亦然。这可能吗？

Answer 1

例如，

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\n", 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

输出:

[-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]