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Golang program to read bytes from the file

Here, we are going to learn how to read bytes from the file in Golang (Go Language)?
Submitted by Nidhi, on April 06, 2021 [Last updated : March 04, 2023]

How to read bytes from the file in Golang?

Problem Solution:

In this program, we will read bytes from the existing file using Read() function and print data on the console screen.

Program/Source Code:

The source code to read bytes from the file is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

Golang code to read bytes from the file

// Golang program to read bytes
// from the file

package main

import "os"
import "fmt"

func main() {
	Myfile, err := os.Open("Sample.txt")
	if err != nil {
		fmt.Println("Error opening file!!!")
	}

	byteBuff := make([]byte, 12)
	totalLen, err := Myfile.Read(byteBuff)
	if err != nil {
		fmt.Println(err)
	}
	fmt.Printf("File Data: \n%s\n", string(byteBuff[:totalLen]))

	Myfile.Close()
}

Output:

File Data: 
Hello World

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt, os packages then we can use a function related to the fmt and os package.

In the main() function, we read 12 bytes from the existing "Sample.txt" file and print the result on the console screen.

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