How to convert the string 'REDIS' to binary and write to a file using Go language?

Go language string to binary file writing

This article describes how to convert the string "REDIS" into binary data and write it to a file using Go language so that it appears as "52 45 44 49 53" when viewed using vim 's %!xxd command. It can be achieved without the help of binary package.

First, understand the binary representation of the string "REDIS". Using the hexdump command, we can see its hexadecimal representation:

 echo 'REDIS' | hexdump
0000000 52 45 44 49 53 0a
0000006

Ignore the last newline character 0a , and the binary representation of "REDIS" is 52 45 44 49 53 . Therefore, writing the string directly to the file can achieve the purpose.

The following Go code implements this function:

 package main

import (
    "fmt"
    "io"
    "log"
    "os"
)

func main() {
    file, err := os.Create("redis.bin") // Create a file using os.Create to avoid appending mode if err != nil {
        log.Fatal(err)
    }
    defer file.Close()

    n, err := io.WriteString(file, "REDIS")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("write %d bytes\n", n)
}

After running, use hexdump to view the generated redis.bin file:

 cat redis.bin | hexdump
0000000 52 45 44 49 53
0000005

The results show that the file content is 52 45 44 49 53 , which is consistent with the expectations. Open the redis.bin file through vim , and use %!xxd command to display the hexadecimal representation of 52 45 44 49 53 . This method directly utilizes the string writing function of Go language to complete the conversion and writing of strings to binary files concisely and efficiently. Note that using os.Create instead of os.OpenFile ensures that files are created in write mode to avoid potential append problems.

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