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Golang byte to string 的方法实践

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Golang byte to string 的方法实践

通常使用的方式

使用标准库提供的方式

Go: byte string 转换
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package main

import (
	"bytes"
	"fmt"
)

func main() {
	byteArray := []byte("hello encoding/binary")
	fmt.Println(byteArray)
	byteCode := 'i'
	fmt.Println(byteCode)
	//n := bytes.Index(byteArray, []byte{105})
	n := bytes.IndexByte(byteArray, 105)
	fmt.Println(n)
	s := string(byteArray[:n])
	fmt.Println(s)
	
	//s := string(byteArray[:])
}

使用 unsafe

Go: unsafe
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package main

import (
    "fmt"
    "reflect"
    "unsafe"
)

func BytesToString(b []byte) string {
    bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
    sh := reflect.StringHeader{bh.Data, bh.Len}
    return *(*string)(unsafe.Pointer(&sh))
}

func StringToBytes(s string) []byte {
    sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
    bh := reflect.SliceHeader{sh.Data, sh.Len, 0}
    return *(*[]byte)(unsafe.Pointer(&bh))
}

func main() {
    b := []byte{'b', 'y', 't', 'e'}
    s := BytesToString(b)
    fmt.Println(s)
    b = StringToBytes(s)
    fmt.Println(string(b))
}

// ByteSliceToString is used when you really want to convert a slice // of bytes to a string without incurring overhead. It is only safe
// to use if you really know the byte slice is not going to change // in the lifetime of the string
func ByteSliceToString(bs []byte) string {
        // This is copied from runtime. It relies on the string
        // header being a prefix of the slice header!
        return *(*string)(unsafe.Pointer(&bs))
}

unsafe 方式性能超赞,但顾名思义 unsafe ,至少目前用了10年没问题,如果 go 有重大变化。

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