CODEWITHSUNDEEP
windowspowershell
knight Smoke
knight Smoke

Reputation: 21

Using powershell wait-process concurrently

I'm new to powershell and while practicing the examples for loops, I came across a problem that I couldn't solve.

I want to call a notification about the status of a process running in the system through a loop However, in the code, only the alarm of the process executed first among Taskmgr or Calculator is called by Wait-Process.

I mean, Wait-Process by Sequential Execution makes notification invocation by loop no longer possible

below is my code

do{
        Start-Sleep -s 3
    $Calculator = Get-Process -Name 'Calculator'
    $Taskmgr = Get-Process -Name 'Taskmgr'

    if ($Calculator)
    {
        Show-Notification -ToastTitle 'Calculator is open.'
        Wait-Process -name 'Calculator'
        Show-Notification -ToastTitle 'Calculator is closed.'
    }
    if ($Taskmgr)
    {
        Show-Notification -ToastTitle 'Taskmgr is open.'
        Wait-Process -name 'Taskmgr'
        Show-Notification -ToastTitle 'Taskmgr is closed.'
    }
} while (1 -eq 1)

Since I am Japanese, I am not familiar with English, so I am using a translator. thank you.

I'm still not good enough skill to recreate the code. sorry

Upvotes: 2

Views: 206

Answers (1)

Santiago Squarzon
Santiago Squarzon

Reputation: 59781

Wait-Process blocks the thread indefinitely without the -Timeout parameter but also, while using this parameter if it times out you would get an error and the cmdlet is not particularly useful for this use case.

You could achieve this by using only Get-Process with -ErrorAction SilentlyContinue to avoid errors when the processes are not running and adding else conditions:

while ($true) {
    Start-Sleep -s 3
    $calc = Get-Process -Name CalculatorApp -ErrorAction SilentlyContinue
    $taskmgr = Get-Process -Name Taskmgr -ErrorAction SilentlyContinue

    # if calc is running
    if ($calc) {
        # and there was no notification before
        if (-not $calcOpen) {
            # display notification
            'Calculator is opened.'
            # and set a reminder to not display more popups
            $calcOpen = $true
        }
    }
    # if calc was not running
    else {
        # and was running before
        if ($calcOpen) {
            # display notification
            'Calculator is closed.'
            # and set a reminder that calc has been closed
            $calcOpen = $false
        }
    }

    # same logic applies here
    if ($taskmgr) {
        if (-not $taskmgrOpen) {
            'Taskmgr is opened.'
            $taskmgrOpen = $true
        }
    }
    else {
        if ($taskmgrOpen) {
            'Taskmgr is closed.'
            $taskmgrOpen = $false
        }
    }
}

Upvotes: 2

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