How to convert int to byte type in golang

Golang is one of the fastest programming languages ​​and is widely used in the field of big data. In Golang, numeric type conversion is one of the frequently used operations. This article will introduce how to convert int type to byte type.

In Golang, the int type is an integer type, occupying the range from -2147483648 to 2147483647. The byte type is an unsigned integer type, ranging from 0 to 255.

To convert int type to byte type, you need to use some functions and methods built into Golang. First, you need to convert the int type into a slice of byte type. To do this, we can use the methods provided by the built-in unsafe and reflect packages.

The following is a sample code that implements the conversion of int type to byte type:

import (
    "bytes"
    "reflect"
    "unsafe"
)

func intToBytes(n int) []byte {
    // 获取int类型的值的地址
    ptr := reflect.Pointer(&n)
    // 将int类型转换为[]byte类型的切片
    slice := (*[unsafe.Sizeof(n)]byte)(unsafe.Pointer(ptr))
    // 将[]byte类型的切片转换为[]byte类型
    return bytes.Join([][]byte{slice[:]}, []byte(""))
}

In this code, we first use ## in the reflection package reflect The #Pointer() function obtains the address of the int type value, and then uses the unsafe.Pointer() function in the unsafe package to convert the address A pointer of type Pointer.

Next, we use the reflection package to obtain the byte slices of the

int type value, and finally use the bytes package of the standard library to connect the byte slices into one Complete byte slice. The final result returned is the converted byte type value.

We can write a simple test code to confirm whether this method works:

func main() {
    n := 100
    bytes := intToBytes(n)
    fmt.Println(bytes)
}

The output of the above code will be

[100 0 0 0 0 0 0 0].

In Golang, there are many ways to convert int type to byte type, this is just one of the general methods. When dealing with conversions between different types, you need to ensure data type consistency and data integrity, and you need to be extra careful when doing type conversions. When using Golang for data type conversion, performance and data consistency are usually two aspects that need to be considered.

When using the above conversion method, please note that it only applies to little-endian byte order on the target platform. It is important to note that in the case of big-endian byte order, the output may not match expectations.

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