Automatically update dynamic variable in Winform text field

PowerShell Help
1

Hello,
I found this nice forum after I was shocked to find that questions were no longer possible in the MS Powershell Technet forum. Hope someone here can help me.

I would like to specify a variable in a text field in a winform. This should then update automatically in winform. First, a WMI event is registered, which checks whether a USB device is connected or not. The result is stored in the $Global:ConnectionStatus variable. This also works, the variable changes as soon as a USB device is connected or not. The initial entry of the status in Winform also works. Just don’t update it.

Script:(Should work everywhere).

###Register event to watch changing usb drives

#Query for finding all device arrival events
$query = "SELECT * FROM Win32_VolumeChangeEvent WHERE EventType=2"       

#Register an event subscription
Register-WmiEvent -Query $query -Action {
    $volumeName = (Get-WMIObject -Class Win32_LogicalDisk -Filter "DeviceID='$($Event.SourceEventArgs.NewEvent.DriveName)'").VolumeName   
    $Global:ConnectionStatus = "Laufwerk $volumeName verbunden"
} | Out-Null            

#Query for finding all device Removal events
$query = "SELECT * FROM Win32_VolumeChangeEvent WHERE EventType=3"            

#Register an event subscription
Register-WmiEvent -Query $query -Action {
   $Global:ConnectionStatus = 'Nicht verbunden'
} | Out-Null

#region windows forms
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
#
#Create main form
#
$Form = New-Object System.Windows.Forms.Form
$Form.FormBorderStyle = [System.Windows.Forms.FormBorderStyle]::FixedSingle #modifies the window border, not able to resize
$Form.Text = "Test"
$Form.Size = New-Object System.Drawing.Size(946, 580)
$Form.StartPosition = "CenterScreen"
$Form.AutoScroll = $True
$Form.AutoSize = $True
$Form.AutoSizeMode = "GrowOnly" #GrowAndShrink or GrowOnly
$Font = New-Object System.Drawing.Font("Microsoft Sans Serif", 12)
$Form.Font = $Font
$Icon = [system.drawing.icon]::ExtractAssociatedIcon($PSHOME + "\powershell.exe")
$Form.Icon = $Icon
#
#Create textbox
#
$Textbox1Connection = New-Object 'System.Windows.Forms.TextBox'
$Textbox1Connection.Font = [System.Drawing.Font]::new('Microsoft Sans Serif', '9.75')
$Textbox1Connection.Location = New-Object System.Drawing.Size(36, 45)
$Textbox1Connection.Size = New-Object System.Drawing.Size(180, 22)
$Textbox1Connection.Text = "$Global:ConnectionStatus"
$textbox1Connection.TextAlign = 'Center'
$Textbox1Connection.ReadOnly = $True
$Form.Controls.Add($Textbox1Connection)

#Activate the form
$Form.Add_Shown({$Form.Activate()})
[void]$Form.ShowDialog() 

#Unregister event
#Get-EventSubscriber | Unregister-Event

I tried

$Textbox1Connection.add_TextChanged({ $displayLabel.Text = $Global:ConnectionStatus })

but that dosen`t work.

Grateful for any help,

Sönke

3

Sören,
Welcome to the forum. :wave:t3:

Einem geschenkten Gaul, guckt man nicht ins Maul. :man_shrugging:t3:

Great that you’ve found a solution by yourself and thanks for sharing.

You may go back, edit your reply once again and fix the formatting of your code. Please use the “code” formatting instead of the “quote” formatting.

Thanks in advance. :+1:t3: :love_you_gesture:t3:

4

Found a not very professional solution, but it works:

function TextBox-Update
{
$Textbox1Connection.Text = “$Global:ConnectionStatus”
}

#Get acual status, name and driveletter of usb device
$MP3PlayerConnected = Get-disk | Where-Object bustype -eq ‘usb’ | Where-Object {$_.FriendlyName -like ‘FC-1307 SD*’} | get-partition | get-volume
if ($MP3PlayerConnected.FileSystemLabel -like ‘Rock’)
{
$Global:ConnectionStatus = “Laufwerk” + " " + $MP3PlayerConnected.DriveLetter + “:” + " " + “verbunden”
}
else
{
$Global:ConnectionStatus = ‘Nicht verbunden’
}

###Register event to watch changing usb drives

#Query for finding all device arrival events
$query = “SELECT * FROM Win32_VolumeChangeEvent WHERE EventType=2”

#Register an event subscription
Register-WmiEvent -Query $query -Action {
$volumeName = (Get-WMIObject -Class Win32_LogicalDisk -Filter “DeviceID=‘$($Event.SourceEventArgs.NewEvent.DriveName)’”).VolumeName
$Global:ConnectionStatus = “Laufwerk $volumeName verbunden”
} | Out-Null

#Query for finding all device Removal events
$query = “SELECT * FROM Win32_VolumeChangeEvent WHERE EventType=3”

#Register an event subscription
Register-WmiEvent -Query $query -Action {
$Global:ConnectionStatus = ‘Nicht verbunden’
} | Out-Null

#region windows forms
[void] [System.Reflection.Assembly]::LoadWithPartialName(“System.Windows.Forms”)
[void] [System.Reflection.Assembly]::LoadWithPartialName(“System.Drawing”)

#Create main form

$Form = New-Object System.Windows.Forms.Form
$Form.FormBorderStyle = [System.Windows.Forms.FormBorderStyle]::FixedSingle #modifies the window border, not able to resize
$Form.Text = “Test”
$Form.Size = New-Object System.Drawing.Size(946, 580)
$Form.StartPosition = “CenterScreen”
$Form.AutoScroll = $True
$Form.AutoSize = $True
$Form.AutoSizeMode = “GrowOnly” #GrowAndShrink or GrowOnly
$Font = New-Object System.Drawing.Font(“Microsoft Sans Serif”, 12)
$Form.Font = $Font
$Icon = [system.drawing.icon]::ExtractAssociatedIcon($PSHOME + “\powershell.exe”)
$Form.Icon = $Icon

#Create textbox

$Textbox1Connection = New-Object ‘System.Windows.Forms.TextBox’
$Textbox1Connection.Font = [System.Drawing.Font]::new(‘Microsoft Sans Serif’, ‘9.75’)
$Textbox1Connection.Location = New-Object System.Drawing.Size(36, 45)
$Textbox1Connection.Size = New-Object System.Drawing.Size(180, 22)
$Textbox1Connection.Text = “$Global:ConnectionStatus”
$textbox1Connection.TextAlign = ‘Center’
$Textbox1Connection.ReadOnly = $True
$Form.Controls.Add($Textbox1Connection)

#Create timer to update texbox over fuction TextBox-Update

$Timer = New-Object System.Windows.Forms.Timer
$Timer.Interval = 2000
$Timer.Add_Tick({TextBox-Update})
$Timer.Enabled = $True

#Activate the form
$Form.Add_Shown({$Form.Activate()})
[void]$Form.ShowDialog()

#Unregister event
#Get-EventSubscriber | Unregister-Event