英文:
How to convert int[] to uint8[]
问题
所以，我需要你的帮助。我在那个主题上找不到任何东西。Golang是一种新近开发的语言，所以对于像我这样的新手来说，很难快速找到答案。
英文:
SO, I need your help. I couldn’t find anything on that topic. Golang is a freshly baked language so it’s quite hard to find answers quick for a newcomers like me.
答案1
得分: 5
预定义的Go int类型的大小是与实现相关的，可以是32位或64位（数字类型）。
这里有一个将大端序的int转换为byte（uint8）的示例。
package main
import (
"encoding/binary"
"fmt"
"reflect"
)
func IntsToBytesBE(i []int) []byte {
intSize := int(reflect.TypeOf(i).Elem().Size())
b := make([]byte, intSize*len(i))
for n, s := range i {
switch intSize {
case 64 / 8:
binary.BigEndian.PutUint64(b[intSize*n:], uint64(s))
case 32 / 8:
binary.BigEndian.PutUint32(b[intSize*n:], uint32(s))
default:
panic("unreachable")
}
}
return b
}
func main() {
i := []int{0, 1, 2, 3}
fmt.Println("int size:", int(reflect.TypeOf(i[0]).Size()), "bytes")
fmt.Println("ints:", i)
fmt.Println("bytes:", IntsToBytesBE(i))
}
输出：
int size: 4 bytes
ints: [0 1 2 3]
bytes: [0 0 0 0 0 0 0 1 0 0 0 2 0 0 0 3]
或者
int size: 8 bytes
ints: [0 1 2 3]
bytes: [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 3]
英文:
The predeclared Go int type size is implementation-specific, either 32 or 64 bits (Numeric types).
Here's an example of converting big-endian ints to bytes (uint8s).
package main
import (
"encoding/binary"
"fmt"
"reflect"
)
func IntsToBytesBE(i []int) []byte {
intSize := int(reflect.TypeOf(i).Elem().Size())
b := make([]byte, intSize*len(i))
for n, s := range i {
switch intSize {
case 64 / 8:
binary.BigEndian.PutUint64(b[intSize*n:], uint64(s))
case 32 / 8:
binary.BigEndian.PutUint32(b[intSize*n:], uint32(s))
default:
panic("unreachable")
}
}
return b
}
func main() {
i := []int{0, 1, 2, 3}
fmt.Println("int size:", int(reflect.TypeOf(i[0]).Size()), "bytes")
fmt.Println("ints:", i)
fmt.Println("bytes:", IntsToBytesBE(i))
}
Output:
int size: 4 bytes
ints: [0 1 2 3]
bytes: [0 0 0 0 0 0 0 1 0 0 0 2 0 0 0 3]
or
int size: 8 bytes
ints: [0 1 2 3]
bytes: [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 3]
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论