golang byte conversion

The byte type in Golang is a very important data type, which is used to store 8-bit binary data. In many cases, we need to convert the byte type so that data processing and operations can be performed more conveniently. This article will introduce how to perform byte conversion.

1. Convert byte to string

In Golang, you can use the string() function to convert byte type to string. Examples are as follows:

package main

import "fmt"

func main() {
    b := []byte{'h','e','l','l','o'}
    s := string(b)
    fmt.Println(s)  // 输出为 "hello"
}

2. Convert string to byte

You can also use the []byte() function to convert a string to byte type. An example is as follows:

package main

import "fmt"

func main() {
    s := "hello"
    b := []byte(s)
    fmt.Println(b)  // 输出为 [104 101 108 108 111]
}

3. byte conversion to int

We can use the int() function to convert the byte type to an integer type. An example is as follows:

package main

import "fmt"

func main() {
    b := byte(255)
    i := int(b)
    fmt.Println(i)  // 输出为 255
}

It should be noted that the value range of the byte type is 0~255. Values ​​outside this range will generate runtime exceptions.

4. Convert int to byte

We can use the byte() function to convert the integer type to the byte type. An example is as follows:

package main

import "fmt"

func main() {
    i := 255
    b := byte(i)
    fmt.Println(b)  // 输出为 255
}

It should be noted that if the value of the integer type exceeds the value range of the byte type, only the lower 8 bits will be taken.

5. Convert byte array to uint16

In Golang, we can convert by splicing two consecutive elements of the byte array into a uint16 type. An example is as follows:

package main

import "fmt"

func main() {
    b := []byte{0x12, 0x34}
    u := uint16(b[0])<<8 + uint16(b[1])
    fmt.Println(u)  // 输出为 4660
}

It should be noted that the byte order (big endian or little endian) needs to be paid attention to during the conversion process.

6. Convert uint16 to byte array

You can also use the []byte type to convert uint16 type to byte array. An example is as follows:

package main

import "fmt"

func main() {
    u := uint16(4660)
    var b = make([]byte, 2)
    b[0] = byte(u >> 8)
    b[1] = byte(u)
    fmt.Println(b)  // 输出为 [18 52]
}

It should be noted that the conversion process also needs to pay attention to the byte order issue.

Summary

This article introduces how to convert byte type, covering conversion between byte and string, byte and int, byte array and uint16. In actual development, byte type conversion will often occur. Mastering the above conversion methods can make data processing and calculations more convenient.

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