How to close input in Golang

Golang is a popular programming language that provides many useful built-in functions when dealing with input and output. In some cases, we may wish to disable user input into our program. This article will explain how to turn off input in Golang.

Why should we turn off the input?

In some applications, we need to ensure the correctness and security of input. For example, enter some confidential information or enter data that affects program logic. In these cases, we want to be able to limit the input sources of the program and ensure the correctness of the input.

How to close input in Golang?

In Golang, there are several ways to close input. Two of these methods will be introduced below.

1. Use the os.Stdin.Close() function

In Golang, os.Stdin is a very useful built-in variable that represents the standard input stream of the program. Closing this variable will prevent the program from reading data from the standard input stream.

Use the os.Stdin.Close() function to close the standard input of the program.

package main

import (
    "fmt"
    "os"
)

func main() {
    fmt.Println("input your name:")
    var name string
    _, err := fmt.Scanln(&name)
    if err != nil {
        fmt.Println(err)
    }
    fmt.Println("Hello", name)

    os.Stdin.Close()//关闭标准输入
    fmt.Scanln()//此时将不能再输入
}

2. Use the io.EOF flag in the bufio.Reader structure

The bufio.Reader structure in Golang also provides a method to close input. Specifically, we can check whether the input has ended when reading the input. If the input has ended, we can close the input and prohibit further input of data.

package main

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

func main() {
    fmt.Println("input your name:")
    var name string
    reader := bufio.NewReader(os.Stdin)
    for {
        line, err := reader.ReadString('\n')
        if line == "\n" {
            fmt.Println("Name:", name)
            break
        }
        if err == nil {
            name += line
        } else if err.Error() == "EOF" {
            fmt.Println("Name:", name)
            break
        }
    }
    reader = nil
}

In the above code, we use the bufio.NewReader() function to create a bufio.Reader object and use its ReadString() method to read the input.

After each read, we check if the error is io.EOF. If it is, it means that the input has ended and we can close the input.

Summary

The above are two methods of closing Golang input. In some cases, we may need to disable user input. Using these methods can help us ensure the correctness and safety of the program.

Of course, turning off input is not always necessary. The specific situation needs to be determined according to the application scenario.

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