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Golang program to read data from file till specified character using pre-defined function

Here, we are going to learn how to read data from file till specified character using pre-defined function in Golang (Go Language)?
Submitted by Nidhi, on April 09, 2021 [Last updated : March 04, 2023]

Reading data from file till specified character in Golang

Problem Solution:

In this program, we will open a file and create a buffer-reader using a file pointer and then read data from a file from a specified character using ReadBytes() function and print data on the console screen.

Program/Source Code:

The source code to read data from file to specified character using pre-defined function is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

Golang code to read data from file till specified character using pre-defined function

// Golang program to read data from file till
// specified character using pre-defined function

package main

import "fmt"
import "os"
import "bufio"

func main() {
	filePtr, err := os.Open("Demo.txt")
	if err != nil {
		fmt.Println(err)
	}

	bufferedReader := bufio.NewReader(filePtr)

	//Read data from file till character 'W'
	data, err := bufferedReader.ReadBytes('W')
	if err != nil {
		fmt.Println(err)
	}
	fmt.Printf("Data    : %s\n", data)

	filePtr.Close()
}

Output:

Data    : Hello W

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.

Here, we also imported the bufio package to use buffer writer to write data into a file.

In the main() function, we opened the "Demo.txt" file and then create a buffer-reader using NewReader() function and read data from the file till "W" using ReadBytes() function and print the data on the console screen.

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