Question

我正在将一个数据数组连接到一个可执行程序中，但我需要在foreach循环中的每次调用之后阻塞它。它会在第一次调用之前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 }
  }

Answer 1

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。如果您输入cmd /?，请获得帮助，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
    }
}

如果您不喜欢cmd /c，可以使用Jobs。

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.
        }
    }
}

Answer 2

我可以想出两种方法来解决这个问题：

将您的可执行调用传递给Out-Null
shell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，因此我可以运行并测试我的解决方案;希望它会翻译。这是我开始使用的等同于您的示例代码，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，但是Out-Null的管道强制脚本在循环的每次迭代中等待。

# 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，使用cmd /c调用可执行文件并使脚本等待的相同代码（或多或少）。

# 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 $program "$_" }

Answer 3

根据您的情况，wait-job可能有点矫枉过正。如果您有一种编程方式来知道无论什么程序已经完成了它的事情，您可以尝试像

这样的东西

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

哦and。

Powershell管道进入exe并等待

3 个答案: