Cancel Button in a PowerShell Script - powershell

Question

I have the below PowerShell Script that takes a users input and injects it into an automated SSRS install. Everything is working as intended except for the Cancel button. I would like the user to be able to click Cancel and stop the script from proceeding.
I am very new to PowerShell and self teaching so looking for some help.
function button ($title,$instance,$acct,$pass) {
###################Load Assembly for creating form & button######
[void][System.Reflection.Assembly]::LoadWithPartialName( “System.Windows.Forms”)
[void][System.Reflection.Assembly]::LoadWithPartialName( “Microsoft.VisualBasic”)
#####Define the form size & placement
$form = New-Object “System.Windows.Forms.Form”;
$form.Width = 500;
$form.Height = 160;
$form.Text = $title;
$form.StartPosition = [System.Windows.Forms.FormStartPosition]::CenterScreen;
##############Define text label1
$textLabel1 = New-Object “System.Windows.Forms.Label”;
$textLabel1.Left = 25;
$textLabel1.Top = 15;
$textLabel1.Text = $instance;
##############Define text label2
$textLabel2 = New-Object “System.Windows.Forms.Label”;
$textLabel2.Left = 25;
$textLabel2.Top = 50;
$textLabel2.Text = $acct;
##############Define text label3
$textLabel3 = New-Object “System.Windows.Forms.Label”;
$textLabel3.Left = 25;
$textLabel3.Top = 85;
$textLabel3.Text = $pass;
############Define text box1 for input
$textBox1 = New-Object “System.Windows.Forms.TextBox”;
$textBox1.Left = 150;
$textBox1.Top = 10;
$textBox1.width = 200;
############Define text box2 for input
$textBox2 = New-Object “System.Windows.Forms.TextBox”;
$textBox2.Left = 150;
$textBox2.Top = 50;
$textBox2.width = 200;
############Define text box3 for input
$textBox3 = New-Object “System.Windows.Forms.TextBox”;
$TextBox3.Passwordchar = "*"
$textBox3.Left = 150;
$textBox3.Top = 90;
$textBox3.width = 200;
#############Define default values for the input boxes
$defaultValue = “”
$textBox1.Text = $defaultValue;
$textBox2.Text = $defaultValue;
$textBox3.Text = $defaultValue;
#############define OK button
$button = New-Object “System.Windows.Forms.Button”;
$button.Left = 360;
$button.Top = 85;
$button.Width = 100;
$button.Text = “Submit”;
#############define CANCEL button
$button2 = New-Object “System.Windows.Forms.Button”;
$button2.Left = 360;
$button2.Top = 45;
$button2.Width = 100;
$button2.Text = “Cancel”;
############# This is when you have to close the form after getting values
$eventHandler = [System.EventHandler]{
$textBox1.Text;
$textBox2.Text;
$textBox3.Text;
$form.Close();};
$button.Add_Click($eventHandler) ;
#############Add controls to all the above objects defined
$form.Controls.Add($button);
$form.Controls.Add($button2);
$form.Controls.Add($textLabel1);
$form.Controls.Add($textLabel2);
$form.Controls.Add($textLabel3);
$form.Controls.Add($textBox1);
$form.Controls.Add($textBox2);
$form.Controls.Add($textBox3);
$ret = $form.ShowDialog();
#################return values
return $textBox1.Text, $textBox2.Text, $textBox3.Text
}
$return= button “SSRS Configuration” “Instance Name” “Domain\ServiceID” “Password”
#Below variables will get the values that had been entered by the user
$return[0]
$return[1]
$return[2]
D:\SQL2016\"SQL Server 2016 SP1"\Setup.exe /q /IACCEPTSQLSERVERLICENSETERMS /ACTION="install" /USEMICROSOFTUPDATE="False" /INDICATEPROGRESS /INSTANCENAME="$($return[0])" /FEATURES="RS" /RSINSTALLMODE="FilesOnlyMode" /INSTANCEDIR="D:\Program Files\Microsoft SQL Server" /RSSVCACCOUNT="$($return[1])" /RSSVCPASSWORD="$($return[2])"

Answer 1

Below a rewrite of your code. I left most of it intact, except for:
I removed the semi-colons because they are not needed in PowerShell
I replaced all curly quotes with straight ones
Both buttons now have a defined DialogResult
I changed the deprecated LoadWithPartialName lines
Added a $form.Dispose()
Checked if the dialog exited with OK
I also use the Start-Process cmdlet to finally execute the exe to make the code more readable and possible for you to examine the exit code from it, and.. INDENTED the code.
function button ($title,$instance,$acct,$pass) {
###################Load Assembly for creating form & button######
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName Microsoft.VisualBasic
#####Define the form size & placement
$form = New-Object "System.Windows.Forms.Form"
$form.Width = 500
$form.Height = 160
$form.Text = $title
$form.StartPosition = [System.Windows.Forms.FormStartPosition]::CenterScreen
##############Define text label1
$textLabel1 = New-Object "System.Windows.Forms.Label"
$textLabel1.Left = 25
$textLabel1.Top = 15
$textLabel1.Text = $instance
##############Define text label2
$textLabel2 = New-Object "System.Windows.Forms.Label"
$textLabel2.Left = 25
$textLabel2.Top = 50
$textLabel2.Text = $acct
##############Define text label3
$textLabel3 = New-Object "System.Windows.Forms.Label"
$textLabel3.Left = 25
$textLabel3.Top = 85
$textLabel3.Text = $pass
############Define text box1 for input
$textBox1 = New-Object "System.Windows.Forms.TextBox"
$textBox1.Left = 150
$textBox1.Top = 10
$textBox1.width = 200
############Define text box2 for input
$textBox2 = New-Object "System.Windows.Forms.TextBox"
$textBox2.Left = 150
$textBox2.Top = 50
$textBox2.width = 200
############Define text box3 for input
$textBox3 = New-Object "System.Windows.Forms.TextBox"
$TextBox3.Passwordchar = "*"
$textBox3.Left = 150
$textBox3.Top = 90
$textBox3.width = 200
#############Define default values for the input boxes
$defaultValue = ""
$textBox1.Text = $defaultValue
$textBox2.Text = $defaultValue
$textBox3.Text = $defaultValue
#############define OK button
$button = New-Object "System.Windows.Forms.Button"
$button.Left = 360
$button.Top = 85
$button.Width = 100
$button.Text = "Submit"
$button.DialogResult = [System.Windows.Forms.DialogResult]::OK
#############define CANCEL button
$button2 = New-Object "System.Windows.Forms.Button"
$button2.Left = 360
$button2.Top = 45
$button2.Width = 100
$button2.Text = "Cancel"
$button2.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
############# This is when you have to close the form after getting values
$eventHandler = [System.EventHandler]{
$textBox1.Text
$textBox2.Text
$textBox3.Text
$form.Close()
}
$button.Add_Click($eventHandler)
#############Add controls to all the above objects defined
$form.Controls.Add($button)
$form.Controls.Add($button2)
$form.Controls.Add($textLabel1)
$form.Controls.Add($textLabel2)
$form.Controls.Add($textLabel3)
$form.Controls.Add($textBox1)
$form.Controls.Add($textBox2)
$form.Controls.Add($textBox3)
$ret = $form.ShowDialog()
$result = $null
#################return values
if ($ret -eq 'OK') {
# if NOT cancelled, return whatever is in the 3 text boxes
$result = $textBox1.Text, $textBox2.Text, $textBox3.Text
}
# Dispose of the form
$form.Dispose()
return $result
}
$return= button "SSRS Configuration" "Instance Name" "Domain\ServiceID" "Password"
# test if the function returned anything, otherwise it was cancelled
if ($return) {
#Below variables will get the values that had been entered by the user
$return[0]
$return[1]
$return[2]
# for better readability, create the arguments for the Setup.exe as array
$arguments = '/q',
'/IACCEPTSQLSERVERLICENSETERMS',
'/ACTION="install"',
'/USEMICROSOFTUPDATE="False"',
'/INDICATEPROGRESS',
('/INSTANCENAME="{0}"' -f $return[0]),
'/FEATURES="RS"',
'/RSINSTALLMODE="FilesOnlyMode"',
'/INSTANCEDIR="D:\Program Files\Microsoft SQL Server"',
('/RSSVCACCOUNT="{0}"' -f $return[1]),
('/RSSVCPASSWORD="{0}"' -f $return[2])
$proc = Start-Process -FilePath "D:\SQL2016\SQL Server 2016 SP1\Setup.exe" -ArgumentList $arguments -PassThru -Wait
# you can examine the processes ExitCode using:
Write-Host "The process returned ExitCode: $($proc.ExitCode)"
}
else {
Write-Host "User cancelled the dialog.."
}
Hope that helps