Q:

Golang program to get the available buffer size of buffer writer

belongs to collection: Golang Buffered Input-Output Programs

YasminRadwan26
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2022-07-04
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In this program, we will get the available buffered size of buffer writer and print result on the console screen.

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YasminRadwan26
2022-07-04
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Program/Source Code:

The source code to get the available buffer size of the buffer-writer is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Golang program to get the available buffer size

package main

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

func main() {
	filePtr, err := os.OpenFile("Demo.txt", os.O_WRONLY, 0666)

	if err != nil {
		fmt.Println(err)
	}

	//Create a buffer writter using file pointer.
	bufferedWriter := bufio.NewWriter(filePtr)

	len, err := bufferedWriter.WriteString("Hello World\n")
	if err != nil {
		fmt.Println(err)
	}
	fmt.Printf("%d bytes written into file\n", len)

	AvailableBuffer := bufferedWriter.Available()
	if err != nil {
		fmt.Println(err)
	}
	fmt.Printf("Available buffer size: %d\n", AvailableBuffer)

	// Write memory buffer to disk
	bufferedWriter.Flush()

	filePtr.Close()
}

Output:

12 bytes written into file
Available buffer size: 4084

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 created a buffer-writer using bufio.NewWriter() function. Then we got the available buffer size using the Available() function and print the result on the console screen.

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