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我正在将一组数据传输到一个可执行程序中，但我需要在 foreach 循环中的每次调用后阻塞它。它甚至会在第一次调用打开程序之前离开循环。

 Set-Alias program "whatever.exe"

 foreach ($data in $all_data)
  {
       $data| %{ program /command:update /path:"$_" /closeonend:2 }
  }
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3 回答 3

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我可以想到两种方法来解决这个问题：

  1. 将您的可执行调用传递给 Out-Null
  2. 发出对 cmd.exe /c 的调用（如@BobLobLaw 的回答所示）

我使您的示例代码更加具体，以便我可以运行和测试我的解决方案；希望它会翻译。这是我开始的与您的示例代码等效的内容，即脚本执行时无需等待可执行文件完成。

# I picked a specific program
Set-Alias program "notepad.exe"

# And put some values in $all_data, specifically the paths to three text files.
$all_data = Get-Item B:\matt\Documents\*.txt

# This opens each file in notepad; three instances of notepad are running 
# when the script finishes executing.
$all_data | %{ program "$_" }

这是与上面相同的代码，但管道Out-Null强制脚本等待循环的每次迭代。

# I picked a specific program
Set-Alias program "notepad.exe"

# And put some values in $all_data, specifically the paths to three text files.
$all_data = Get-Item B:\matt\Documents\*.txt

# Piping the executable call to out-null forces the script execution to wait
# for the program to complete. So in this example, the first document opens
# in notepad, but the second won't open until the first one is closed, and so on.
$all_data | %{ program "$_" | Out-Null}

最后，相同的代码（或多或少）cmd /c用于调用可执行文件并使脚本等待。

# Still using notepad, but I couldn't work out the correct call for
# cmd.exe using Set-Alias. We can do something similar by putting
# the program name in a plain old variable, though.
#Set-Alias program "notepad.exe"
$program = "notepad.exe"

# Put some values in $all_data, specifically the paths to three text files.
$all_data = Get-Item B:\matt\Documents\*.txt

# This forces script execution to wait until the call to $program
# completes.  Again, the first document opens in notepad, but the second
# won't open until the first one is closed, and so on.
$all_data | %{ cmd /c $program "$_" }
于 2013-05-23T00:37:55.203 回答
2

我喜欢 PowerShell，但我从未真正学过Invoke-Command. 因此，每当我需要运行 EXE 时，我总是使用 cmd。如果您键入cmd /?您会得到它的帮助，请查看“c”开关。我会做这样的事情：

foreach ($data in $all_data){
    $data |
    Foreach-Object{
        cmd /c "whatever.exe" /command:update /path:"$_" /closeonend:2
    }
}

如果你不喜欢cmd /c你可以使用乔布斯的东西。

foreach ($data in $all_data){
    $data |
    Foreach-Object{
        $job = Start-Job -InitializationScript {Set-Alias program "whatever.exe"} -ScriptBlock {program /command:update /path:"$($args[0])" /closeonend:2} -ArgumentList $_
        while($job.Status -eq 'Running'){
            Start-Sleep -Seconds 3
            #Could make it more robust and add some error checking.
        }
    }
}
于 2013-05-22T19:14:06.367 回答
0

根据您的情况，等待作业可能是矫枉过正。如果你有一种编程方式知道whatever.exe已经完成了它的事情，你可以尝试类似的东西

do {start-sleep -sec 2} until ($done -eq $true)

哦和。

于 2013-05-22T16:13:09.743 回答