powershell checkbox generated dynamically to array

Question

Hello,

i have a form in which the checkboxes are generated dynamically reading a file.

I'm trying to have the text of the checkboxes being added to an array if they are checked or removed from the array if the are unchecked .

Ihere the code i wrote . It does not work but i do no know why .

function checkbox_test{

$instances = [System.Collections.ArrayList]@()  


[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")  
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")  

# Set the size of your form  
$Form = New-Object System.Windows.Forms.Form  
$Form.width = 2000  
$Form.height = 1000  
$Form.Text = ”My First Form with a working checkbox”  

# Set the font of the text to be used within the form  
$Font = New-Object System.Drawing.Font("Times New Roman",12)  
$Form.Font = $Font  

# create your checkbox   


Clear-Host  

$moduleemplacment="D:\PowerShell\modules"

$EmplacementFichier = "D:\PowerShell\instanceliste.txt"
$MonFichier = get-content $EmplacementFichier
$a=1
$b=50
$c=30
$checkboxes= foreach ($UneLigne in $MonFichier){

$varcheckbox=-join("$checkbox",$a)  
$varcheckbox = new-object System.Windows.Forms.checkbox                              
$varcheckbox.Location = new-object System.Drawing.Size($b,$c)  
$varcheckbox.Size = new-object System.Drawing.Size(250,50)                              
$varcheckbox.Text = $UneLigne  
$varcheckbox.Checked = $true                              
$Form.Controls.Add($varcheckbox)   
$instances.Add($varcheckbox.Text)   




$c=$c+50  

$a=$a+1  



                                }  



# Add an OK button  
$OKButton = new-object System.Windows.Forms.Button  
$OKButton.Location = new-object System.Drawing.Size(130,300)  
$OKButton.Size = new-object System.Drawing.Size(100,40)  
$OKButton.Text = "OK"  
$OKButton.Add_Click({  
 foreach($CheckBox in $CheckBoxes) {  

                write-host $CheckBox.Text  
                if (!($CheckBox.Checked ))  

                {  

                $instances.remove($CheckBox.Text)   
                }  
                                    }  



[System.Windows.Forms.MessageBox]::Show($instances)  




})  


$form.Controls.Add($OKButton)  

#Add a cancel button  
$CancelButton = new-object System.Windows.Forms.Button  
$CancelButton.Location = new-object System.Drawing.Size(255,300)  
$CancelButton.Size = new-object System.Drawing.Size(100,40)  
$CancelButton.Text = "Cancel"  
$CancelButton.Add_Click({$Form.Close()})  
$form.Controls.Add($CancelButton)  

###########  This is the important piece ##############  
#                                                     #  
# Do something when the state of the checkbox changes #  
#######################################################  

$checkbox1.Add_CheckStateChanged({

$OKButton.Enabled = $checkbox1.Checked })

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

}

Call the function

checkbox_test

Answer 1

Well, firstly you have this statement in your code (about line #51):

$varcheckbox = -join ("$checkbox", $a)

But the variable "$checkbox" is not yet defined or initialized. Also, the quotes surrounding that variable name are unnecessary. Perhaps you meant to use only the string "checkbox"?

And on (about) line #82 and 83, you once again use an undefined variable, this one is $checkbox1:

$checkbox1.Add_CheckStateChanged( {
            $OKButton.Enabled = $checkbox1.Checked })

Make those two corrections first. You might also want to add "Set-StrictMode -Version Latest" to help with finding and fixing any other "transgressions" in the code.

Answer 2

Hello,

First thanks for your answer, no i mean the string "$checkbox".
line 83-83 are commented

Answer 3

Hello,

i found a script on which i can based my work https://stackoverflow.com/questions/32278589/how-do-i-dynamically-create-check-boxes-from-an-array-using-the-form

function GenerateForm {
param(
[string[]]$CheckBoxLabels
)

Keep track of number of checkboxes

$CheckBoxCounter = 1

When we create a new textbox, we add it to an array for easy reference later

$CheckBoxes = foreach($Label in $CheckBoxLabels) {
$CheckBox = New-Object System.Windows.Forms.CheckBox
$CheckBox.UseVisualStyleBackColor = $True
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Width = 104
$System_Drawing_Size.Height = 24
$CheckBox.Size = $System_Drawing_Size
$CheckBox.TabIndex = 2

# Assign text based on the input  
$CheckBox.Text = $Label  

$System_Drawing_Point = New-Object System.Drawing.Point  
$System_Drawing_Point.X = 27  
# Make sure to vertically space them dynamically, counter comes in handy  
$System_Drawing_Point.Y = 13 + (($CheckBoxCounter - 1) * 31)  
$CheckBox.Location = $System_Drawing_Point  
$CheckBox.DataBindings.DefaultDataSourceUpdateMode = 0  

# Give it a unique name based on our counter  
$CheckBox.Name = "CheckBox$CheckBoxCounter"  

# Add it to the form  
$form1.Controls.Add($CheckBox)  
# return object ref to array  
$CheckBox  
# increment our counter  
$CheckBoxCounter++  
                                               }  

$handler_button1_Click=
{
$listBox1.Items.Clear();

# Keep track of whether something has been added to the list  
$ContentPresent = $false  
# Iterate over the checkboxes, one by one  
foreach($CheckBox in $CheckBoxes){  
    if($CheckBox.Checked){  
        $listBox1.Items.Add("{0} (with value ""{1}"") has been checked" -f ($CheckBox.Name,$CheckBox.Text))  
        $ContentPresent = $True  
    }  
}  

# If something was already added to the list, no need to show default message  
if (-not $ContentPresent) { $listBox1.Items.Add("No CheckBox selected....") }   

}

}

GenerateForm -CheckBoxLabels "test1"

but when i run it i have :

GenerateForm -CheckBoxLabels "test1"
Impossible d’appeler une méthode dans une expression Null.
Au caractère Ligne:32 : 5

• $form1.Controls.Add($CheckBox)
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : InvalidOperation : (:) [], RuntimeException
• FullyQualifiedErrorId : InvokeMethodOnNull

any clues ?

thanks,

Answer 4

Hello,

here the new version :

function GenerateForm {
param(
[Array[]]$CheckBoxLabelsInstances,
[Array[]]$CheckBoxLabelsModules
)

Keep track of number of CheckBoxesInstances

[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")  
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")  

$instances = [System.Collections.ArrayList]@()

$modules = [System.Collections.ArrayList]@()
$form1 = New-Object System.Windows.Forms.Form
$form1.Text = "Primal Form"
$form1.Name = "form1"
$form1.DataBindings.DefaultDataSourceUpdateMode = 0
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Width = 2000
$System_Drawing_Size.Height = 2000
$form1.ClientSize = $System_Drawing_Size

$button1 = New-Object System.Windows.Forms.Button
$button1.Text = "Run Script"

$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 27
$System_Drawing_Point.Y = 156
$button1.Location = $System_Drawing_Point
$button1.DataBindings.DefaultDataSourceUpdateMode = 0

$form1.Controls.Add($button1)
$button1.add_Click({

$listBox1.Items.Clear();  

# Keep track of whether something has been added to the list  
$ContentPresent = $false  
# Iterate over the CheckBoxesInstances, one by one  
foreach($CheckBoxInstance in $CheckBoxesInstances){  
    if(!($CheckBoxInstance.Checked)){  
        write-host $CheckBoxInstance.Text  
        $instances.remove($CheckBoxInstance.Text)   
        write-host  " nouveau " $instances  
        $ContentPresent = $True  
    }  
}  

})

$CheckBoxCounterInstance = 1

When we create a new textbox, we add it to an array for easy reference later

$CheckBoxesInstances = foreach($LabelInstance in $CheckBoxLabelsInstances) {
$CheckBoxInstance = New-Object System.Windows.Forms.CheckBox
$CheckBoxInstance.UseVisualStyleBackColor = $True
$CheckBoxInstance.Checked = $True
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Width = 104
$System_Drawing_Size.Height = 24
$CheckBoxInstance.Size = $System_Drawing_Size
$CheckBoxInstance.TabIndex = 2

# Assign text based on the input  
$CheckBoxInstance.Text = $LabelInstance  
  
$System_Drawing_Point = New-Object System.Drawing.Point  
$System_Drawing_Point.X = 27  
# Make sure to vertically space them dynamically, counter comes in handy  
$System_Drawing_Point.Y = 13 + (($CheckBoxCounterInstance - 1) * 31)  
$CheckBoxInstance.Location = $System_Drawing_Point  
$CheckBoxInstance.DataBindings.DefaultDataSourceUpdateMode = 0  

# Give it a unique name based on our counter  
$CheckBoxInstance.Name = "CheckBoxInstance$CheckBoxCounterInstance"  

# Add it to the form  
$form1.Controls.Add($CheckBoxInstance)  
# return object ref to array  
$CheckBoxInstance  
# increment our counter  
$CheckBoxCounterInstance++  
$instances.Add($CheckBoxInstance.Text)   
                                               }  

$CheckBoxCounterModule = 1

$CheckBoxesModules = foreach($LabelModule in $CheckBoxLabelsModules) {
$CheckBoxModule = New-Object System.Windows.Forms.CheckBox
$CheckBoxModule.UseVisualStyleBackColor = $True
$CheckBoxModule.Checked = $True
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Width = 104
$System_Drawing_Size.Height = 24
$CheckBoxModule.Size = $System_Drawing_Size
$CheckBoxModule.TabIndex = 2

# Assign text based on the input  
$CheckBoxModule.Text = $LabelModule  
  
$System_Drawing_Point = New-Object System.Drawing.Point  
$System_Drawing_Point.X = 50  
# Make sure to vertically space them dynamically, counter comes in handy  
$System_Drawing_Point.Y = 13 + (($CheckBoxCounterModule - 1) * 31)  
$CheckBoxModule.Location = $System_Drawing_Point  
$CheckBoxModule.DataBindings.DefaultDataSourceUpdateMode = 0  

# Give it a unique name based on our counter  
$CheckBoxModule.Name = "CheckBoxModule$CheckBoxCounterModule"  

# Add it to the form  
$form1.Controls.Add($CheckBoxModule)  
# return object ref to array  
$CheckBoxModule  
# increment our counter  
$CheckBoxCounterModule++  
$Modules.Add($CheckBoxModule.Text)   
                                               }  

write-host "instances : "$instances

$form1.Add_Shown({$Form1.Activate()})  
[void] $form1.ShowDialog()   

}

$moduleemplacment="D:\PowerShell\modules"
$EmplacementFichier = "D:\PowerShell\instanceliste.txt"
$MonFichier = get-content $EmplacementFichier

$lines= foreach ($UneLigne in $MonFichier){

$UneLigne
}

$modules = Get-ChildItem -Path $moduleemplacment -Directory |
Foreach-Object {
$myobj1name=$_.Name

                }  

write-host $modules
GenerateForm -CheckBoxLabelsInstances $lines -CheckBoxLabelsModules $modules