21-UseBufferedReader.go

package main

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

func main() {

	/*
	   Use Buffered Reader
	*/

	// Dosyayı aç ve onun üzerinden "buffered reader" oluştur
	file, err := os.Open("test.txt")
	if err != nil {
		log.Fatal(err)
	}
	bufferedReader := bufio.NewReader(file)

	byteSlice := make([]byte, 5)
	byteSlice, err = bufferedReader.Peek(5)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Peeked at 5 bytes: %s\n", byteSlice)

	numBytesRead, err := bufferedReader.Read(byteSlice)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Read %d bytes: %s\n", numBytesRead, byteSlice)

	// Bir byte döner. Eğer okunacak byte yoksa hata döner.
	myByte, err := bufferedReader.ReadByte()
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Read 1 byte: %c\n", myByte)

	// Read up to and including delimiter
	// Returns byte slice
	dataBytes, err := bufferedReader.ReadBytes('\n')
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Read bytes: %s\n", dataBytes)

	// Read up to and including delimiter
	// Returns string
	dataString, err := bufferedReader.ReadString('\n')
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Read string: %s\n", dataString)

	// This example reads a few lines so test.txt
	// should have a few lines of text to work correct
}