在运行时自动从 PowerShell 作业中提取数据 [英] Automatically pulling data from a PowerShell job while running

问题描述

在尝试做一些很可能超出 PowerShell 的方法时，我似乎遇到了一堵砖墙.我有一个主窗体脚本，它编排了我的大部分功能，但我需要另一个脚本来打开一个侦听器(system.Net.Sockets.Udpclient.Receive)，并在整个程序运行过程中不断向主窗体中的文本框输入信息.在我的一生中，我无法摆脱这种让工作受苦的愚蠢的非儿童环境；没有点源，没有全局范围的变量，什么都没有.我可以在其上放置一个对象侦听器以完成状态更改，然后打开另一个侦听器并尝试以这种方式进行调整，但它会变得非常混乱且不可靠.

While trying to do something quite possibly beyond the means of PowerShell I seem to have ran into a brick wall. I have a main form script, which orchestrates most of my functions but I need another script to open a listener (system.Net.Sockets.Udpclient.Receive) and keep feeding in information to a textbox in the main form throughout the entire program's running. For the life of me I can't get around this daft non-child environment that jobs suffer from; no dot sourcing, no global scoped variables, nothing. I can put an object-listener on it for statechanged to completion and then open another listener and try and bodge this way but it will get very messy and unreliable.

作为一种解决方法，我希望使用 TCP/UDP 侦听器，它不会挂起应用程序以获取响应、拉取 hasmoredata 的事件或从作业中更新主脚本中的文本框的方法.

As a workaround I would love a TCP/UDP listener which doesn't hang the application for a response, an event to pull on hasmoredata or a way of updatign the textbox in the main script from within the job.

推荐答案

您可以通过引发事件并将其转发回本地会话来从作业中返回数据.

You can return data from a job by raising an event and forwarding it back to the local session.

这是一个例子:

 $job = Start-Job -Name "ReturnMessage" -ScriptBlock {
     # forward events named "MyNewMessage" back to job owner
     # this even works across machines
     Register-EngineEvent -SourceIdentifier MyNewMessage -Forward

     while($true) {
         sleep 2
         $i++
         $message = "This is message $i."
         # raise a new progress event, assigning to $null to prevent
         # it ending up in the job's output stream
         $null = New-Event -SourceIdentifier MyNewMessage -MessageData $message
     }
 }

$event = Register-EngineEvent -SourceIdentifier MyNewMessage -Action {
    Write-Host $event.MessageData -ForegroundColor Green
}

<# Run this to stop job and event listner
$job,$event| Stop-Job -PassThru| Remove-Job
#>

请注意，您仍然可以在作业运行时在提示符处键入.执行块注释中的代码以停止作业和事件侦听器.

Note that you can still type at the prompt while the job is running. Execute the code in the block comments to stop the job and event listner.

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