Go – How to convert a zero-terminated byte array to string

I need to read [100]byte to transfer a bunch of string data.

Because not all of the strings are precisely 100 characters long, the remaining part of the byte array is padded with 0s.

If I convert [100]byte to string by: string(byteArray[:]), the tailing 0s are displayed as ^@^@s.

In C, the string will terminate upon 0, so what's the best way to convert this byte array to string in Go?

Best Answer

Methods that read data into byte slices return the number of bytes read. You should save that number and then use it to create your string. If n is the number of bytes read, your code would look like this:

s := string(byteArray[:n])

To convert the full string, this can be used:

s := string(byteArray[:len(byteArray)])

This is equivalent to:

s := string(byteArray[:])

If for some reason you don't know n, you could use the bytes package to find it, assuming your input doesn't have a null character embedded in it.

n := bytes.Index(byteArray[:], []byte{0})

Or as icza pointed out, you can use the code below:

n := bytes.IndexByte(byteArray[:], 0)

Related Solutions

Go – How to assign string to bytes array

Safe and simple:

[]byte("Here is a string....")

Go – How to convert an int value to string in Go

Use the strconv package's Itoa function.

For example:

package main

import (
    "strconv"
    "fmt"
)

func main() {
    t := strconv.Itoa(123)
    fmt.Println(t)
}

You can concat strings simply by +'ing them, or by using the Join function of the strings package.

Best Answer

Related Solutions

Go – How to assign string to bytes array

Go – How to convert an int value to string in Go

Related Topic