Q:

Golang program to write data bytes into a file

belongs to collection: Golang File Handling Programs

YasminRadwan26
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2022-07-04
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In this program, we will create a file and write data bytes into a text file using os.Write() function.

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YasminRadwan26
2022-07-04
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Program/Source Code:

The source code to write data bytes into a file is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Golang program to write bytes
// into the file

package main

import "os"
import "fmt"

func main() {
	Myfile, err := os.OpenFile("Sample.txt", os.O_WRONLY|os.O_CREATE, 0666)
	if err != nil {
		fmt.Println("Unable to open file")
	}

	data := []byte("Hello World\n")
	len, err := Myfile.Write(data)
	if err != nil {
		fmt.Println("Unable to write bytes into file")
	}

	fmt.Printf("%d bytes written into file.\n", len)
	Myfile.Close()
}

Output:

12 bytes written into file.

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 created a file "Sample.txt" and write the "Hello World\n" message using os.Write() function and print the total number of bytes written into the file.

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