如何在Swift 3.0中使用标准输入运行流程 [英] How to run a Process in Swift 3.0 with standard input

问题描述

使用Swift Process运行MySQL恢复转储文件时遇到问题.

I have a problem when run MySQL restore dump file with Swift Process.

  let command = "/usr/local/bin/mysql -h theHost -P 3306 -u root -pTheInlinePassword example_database < dumpFile.sql"
  let task = Process()
  task.launchPath = "/usr/bin/env"
  task.arguments = command.components(separatedBy: " ")
  task.launch()

问题是Process无法理解标准输入<.我如何使用这样的标准输入运行命令.谢谢.

The problem is Process doesn't understand standard input <. How I can run command with standard input like this. Thanks.

更新:

  let task = Process()
  task.launchPath = "/usr/local/bin/mysql"
  task.arguments =  ["-h", "theHost", "-P", "3306", "-u", "root", "-pTheInLinePassword", "example_data"]
  task.standardInput = try! FileHandle(forReadingFrom: filePath!)
  task.launch()

我尝试了下面的代码.这对我有用

I tried code bellow. This works for me

推荐答案

< filename语法是外壳程序提供的功能，不是程序本身要处理的功能.

The < filename syntax is a feature provided by the shell, not something that programs themselves ever deal with.

处理此问题的正确方法是构造一个FileHandle以便从dumpFile.sql中读取，然后将该FileHandle设置为Process的standardInput属性.

The proper way to handle this is to construct a FileHandle for reading from dumpFile.sql and then set that FileHandle as the standardInput property of the Process.

作为旁注，由于您不依赖PATH查找或设置任何环境变量，因此我不知道您为什么使用/usr/bin/env作为启动路径.

As a side note, I don't know why you're using /usr/bin/env as your launch path, since you're not relying on PATH lookup or setting any environment variables.

let input = try FileHandle(forReadingFrom: URL(fileURLWithPath: "dumpFile.sql"))
let task = Process()
task.launchPath = "/usr/bin/mysql"
task.arguments = ["-h", "theHost", "-P", "3306", "-u", "root", "-pTheInlinePassword", "example_database"]
task.standardInput = input
task.launch()

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