如何在Swift中获得标准输入/输出/错误的`Pipe`？

import Foundation

let pipe = Pipe()

let stdin = pipe.fileHandleForReading
let stdout = pipe.fileHandleForWriting
let stderr = pipe.fileHandleForWriting

FileHandle.standardInput = stdin
FileHandle.standardOutput = stdout
FileHandle.standardError = stderr

import Foundation

let pipe = Pipe()

let stdin = pipe.fileHandleForReading
let stdout = pipe.fileHandleForWriting
let stderr = pipe.fileHandleForWriting

FileHandle.standardInput = stdin
FileHandle.standardOutput = stdout
FileHandle.standardError = stderr

// 从标准输入读取数据
let input = FileHandle.standardInput.readDataToEndOfFile()
let inputString = String(data: input, encoding: .utf8)
print("输入的内容：\(inputString ?? "")")

// 向标准输出写入数据
let outputString = "Hello, World!"
if let outputData = outputString.data(using: .utf8) {
    FileHandle.standardOutput.write(outputData)
}

// 向标准错误写入数据
let errorString = "发生错误！"
if let errorData = errorString.data(using: .utf8) {
    FileHandle.standardError.write(errorData)
}