How to close form GUI after checking existing file in powershell?

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I want to check an existing file, if the process still waiting for the file, it will display a GUI window. After the file is exist, the window will close automatically.

I tried this code, the window can not close, even the file already exist.

What I have tried:

Checking the file:

$SN = "708TSTA"
$MAC = "2E5961370"

function Find {
    $n = 0
    while (-not (Get-ChildItem -Name "D:\SERVER\" | Where-Object {$_ -like "*$SN-$MAC*"})) {
        Start-Sleep -s 1
        D:\Auto\GUI.ps1
        $n++
        (Get-ChildItem -Name "D:\SERVER\" | Where-Object {$_ -like "*$SN-$MAC*"})
        Write-Host "Attempt no $n"
    }

    Write-Host ">>Flag found after $n attempts"
    return $true
}

if (Find) {
    Write-Host "Found"
}

GUI.ps1:

Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.Application]::EnableVisualStyles()

$Form                 = New-Object System.Windows.Forms.Form
$Form.ClientSize      = '578,400'
$Form.Text            = "Form"
$Form.BackColor       = "#c1daf7"
$Form.WindowState     = 'Maximized'
$Form.FormBorderStyle = "FixedDialog"

$Label1               = New-Object System.Windows.Forms.Label
$Label1.Text          = "UNDER PROCESS"
$Label1.AutoSize      = $true
$Label1.Width         = 25
$Label1.Height        = 10
$Label1.Location      = New-Object System.Drawing.Point(600,300)
$Label1.Font          = 'Microsoft Sans Serif,30,style=Bold,Underline'
$Label1.ForeColor     = "#d0021b"

$Label2               = New-Object System.Windows.Forms.Label
$Label2.Text          = "WAITING"
$Label2.AutoSize      = $true
$Label2.Width         = 25
$Label2.Height        = 10
$Label2.Location      = New-Object System.Drawing.Point(770,500)
$Label2.Font          = 'Microsoft Sans Serif,20,style=Bold'
$Label2.ForeColor     = "#fb0505"

$Check = Get-ChildItem -Name "D:\SERVER\" | Where-Object {$_ -like "*$SN-$MAC*"}
if($Check) {
    Write-Host "File Exist"
    $Form.Close()
}

$Form.Controls.AddRange(@($Label1,$Label2))
[void]$Form.ShowDialog()

Posted 18-Jul-19 19:47pm

Member 14156312

Updated 19-Jul-19 4:06am

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Richard Deeming · Answer 1 · 2019-07-19T04:06:00

ShowDialog waits until the window is closed. Your script will not continue running until the user closes the window manually.

You need to use Show instead. You'll need to keep a reference to the form in a variable so that you can close it when the file is found. That will be easier to do if you keep your script in a single file.

For example:

PowerShell

function CreateForm {
    Add-Type -AssemblyName System.Windows.Forms
    [System.Windows.Forms.Application]::EnableVisualStyles()
    
    $Form                 = New-Object System.Windows.Forms.Form
    $Form.ClientSize      = '578,400'
    $Form.Text            = "Form"
    $Form.BackColor       = "#c1daf7"
    $Form.WindowState     = 'Maximized'
    $Form.FormBorderStyle = "FixedDialog"

    $Label1               = New-Object System.Windows.Forms.Label
    $Label1.Text          = "UNDER PROCESS"
    $Label1.AutoSize      = $true
    $Label1.Width         = 25
    $Label1.Height        = 10
    $Label1.Location      = New-Object System.Drawing.Point(600,300)
    $Label1.Font          = 'Microsoft Sans Serif,30,style=Bold,Underline'
    $Label1.ForeColor     = "#d0021b"

    $Label2               = New-Object System.Windows.Forms.Label
    $Label2.Text          = "WAITING"
    $Label2.AutoSize      = $true
    $Label2.Width         = 25
    $Label2.Height        = 10
    $Label2.Location      = New-Object System.Drawing.Point(770,500)
    $Label2.Font          = 'Microsoft Sans Serif,20,style=Bold'
    $Label2.ForeColor     = "#fb0505"

    $Form.Controls.AddRange(@($Label1,$Label2))
    return $Form
}

function Find($folder, $pattern) {
    $n = 0
    $form = $null
    while (-not (Get-ChildItem -Name $folder | Where-Object {$_ -like $pattern})) {
        if ($form -eq $null) {
            $form = CreateForm
            $form.Show()
        }
        
        Start-Sleep -s 1
        $n++
        
        Write-Host "Attempt no $n"
    }
    
    if ($form -ne $null) {
        $form.Close()
        $form.Dispose()
    }
    
    Write-Host ">>Flag found after $n attempts"
    return $true
}

$SN = "708TSTA"
$MAC = "2E5961370"
$folder = "D:\SERVER\"
$pattern = "*$SN-$MAC*"

if (Find $folder $pattern) {
    Write-Host "Found"
}

Form.ShowDialog Method (System.Windows.Forms) | Microsoft Docs[^]
Form.Show(IWin32Window) Method (System.Windows.Forms) | Microsoft Docs[^]