22-ReadWithScanner.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
)

func main() {

	/*
	   Read with a Scanner
	*/

	// Open file and create scanner on top of it
	file, err := os.Open("test.txt")
	if err != nil {
		log.Fatal(err)
	}
	scanner := bufio.NewScanner(file)

	// Default scanner is bufio.ScanLines. Lets use ScanWords.
	// Could also use a custom function of SplitFunc type
	scanner.Split(bufio.ScanWords)

	// Scan for next token.
	success := scanner.Scan()
	if success == false {
		// False on error or EOF. Check error
		err = scanner.Err()
		if err == nil {
			log.Println("Scan completed and reached EOF")
		} else {
			log.Fatal(err)
		}
	}

	// Get data from scan with Bytes() or Text()
	fmt.Println("First word found:", scanner.Text())

	// Call scanner.Scan() again to find next token
}