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POCreating a list box in PowerShell
 

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  1. POCreating a list box in PowerShell
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    <p>I'm trying to write a PowerShell script that will include a list box. To make sure I've got my head wrapped around the concepts needed, I've looked up a tutorial on TechNet and tried to duplicate the code provided.</p> <p><a href="http://technet.microsoft.com/en-us/library/ff730949.aspx" rel="nofollow noreferrer">http://technet.microsoft.com/en-us/library/ff730949.aspx</a></p> <p>If I'm following the walkthrough and script properly, it appears that the script is intended to present a dialog box and then output the selected item to the CLI. I've duplicated the dialog box, but I can't get it to write the selection to the CLI. I even modified the last line to explicitly call Write-Output to show the value of $x.</p> <p>Everything about this script appears to work as intended, except for actually writing out any value for $x. Since <code>echo "$x"</code> is perhaps the simplest line in all that code, I can only presume the problem is actually with getting data <em>written</em> to $x instead.</p> <p>Below is cut-and-paste from my PowerShell ISE window, which in turn was cut-and-paste from the aforementioned TechNet article:</p> <pre><code>[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") [void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing") $objForm = New-Object System.Windows.Forms.Form $objForm.Text = "Select a Computer" $objForm.Size = New-Object System.Drawing.Size(300,200) $objForm.StartPosition = "CenterScreen" $objForm.KeyPreview = $True $objForm.Add_KeyDown({if ($_.KeyCode -eq "Enter") {$x=$objListBox.SelectedItem;$objForm.Close()}}) $objForm.Add_KeyDown({if ($_.KeyCode -eq "Escape") {$objForm.Close()}}) $OKButton = New-Object System.Windows.Forms.Button $OKButton.Location = New-Object System.Drawing.Size(75,120) $OKButton.Size = New-Object System.Drawing.Size(75,23) $OKButton.Text = "OK" $OKButton.Add_Click({$x=$objListBox.SelectedItem;$objForm.Close()}) $objForm.Controls.Add($OKButton) $CancelButton = New-Object System.Windows.Forms.Button $CancelButton.Location = New-Object System.Drawing.Size(150,120) $CancelButton.Size = New-Object System.Drawing.Size(75,23) $CancelButton.Text = "Cancel" $CancelButton.Add_Click({$objForm.Close()}) $objForm.Controls.Add($CancelButton) $objLabel = New-Object System.Windows.Forms.Label $objLabel.Location = New-Object System.Drawing.Size(10,20) $objLabel.Size = New-Object System.Drawing.Size(280,20) $objLabel.Text = "Please select a computer:" $objForm.Controls.Add($objLabel) $objListBox = New-Object System.Windows.Forms.ListBox $objListBox.Location = New-Object System.Drawing.Size(10,40) $objListBox.Size = New-Object System.Drawing.Size(260,20) $objListBox.Height = 80 [void] $objListBox.Items.Add("atl-dc-001") [void] $objListBox.Items.Add("atl-dc-002") [void] $objListBox.Items.Add("atl-dc-003") [void] $objListBox.Items.Add("atl-dc-004") [void] $objListBox.Items.Add("atl-dc-005") [void] $objListBox.Items.Add("atl-dc-006") [void] $objListBox.Items.Add("atl-dc-007") $objForm.Controls.Add($objListBox) $objForm.Topmost = $True $objForm.Add_Shown({$objForm.Activate()}) [void] $objForm.ShowDialog() echo "$x" </code></pre> <p>When the above didn't work as expected, I decided to go step-by-step with the tutorial and re-write the script myself. I modified it a bit to better suit my organizational preferences and to add annotations along the way. However, now even the dialog itself is broken.</p> <pre><code># Load Windows Forms &amp; Drawing classes. [void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") [void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing") # Create base form. $objForm = New-Object System.Windows.Forms.Form $objForm.Text = "Select a Computer" $objForm.Size = New-Object System.Drawing.Size(300,200) $objForm.StartPosition = "CenterScreen" # Configure keyboard intercepts for ESC &amp; ENTER. $objForm.KeyPreview = $true $objForm.Add_KeyDown({ if ($_.KeyCode -eq "Enter") { $x = $objListBox.SelectedItem $objForm.Close() } }) $objForm.Add_KeyDown({ if ($_.KeyCode -eq "Escape") { $objForm.Close() } }) # Create OK button. $OKButton = New-Object System.Windows.Forms.Button $OKButton.Location = New-Object System.Drawing.Size(75,120) $OKButton.Size = New-Object System.Drawing.Size(75,23) $OKButton.Text = "OK" $OKButton.Add_Click({ $x = $objListBox.SelectedItem $objForm.Close() }) $objForm.Controls.Add($OKButton) # Create Cancel button. $CancelButton = New-Object System.Windows.Forms.Button $CancelButton.Location = New-Object System.Drawing.Size(150,120) $CancelButton.Size = New-Object System.Drawing.Size(75,23) $CancelButton.Text = "Cancel" $CancelButton.Add_Click({ $objForm.Close() }) $objForm.Controls.Add($CancelButton) # Add form prompt text. $objLabel = New-Object System.Windows.Forms.Label $objLabel.Location = New-Object System.Drawing.Size(10,20) $objLabel.Text = "Please select a computer:" $objForm.Controls.Add($objLabel) # Add list box. $objListBox = New-Object System.Windows.Forms.ListBox $objListBox.Location = New-Object System.Drawing.Size(10,40) $objListBox.Size = New-Object System.Drawing.Size(260,20) $objListBox.Height = 80 # Populate list. [void] $objListBox.Items.Add("Option1") [void] $objListBox.Items.Add("Option2") [void] $objListBox.Items.Add("Option3") [void] $objListBox.Items.Add("Option4") [void] $objListBox.Items.Add("Option5") [void] $objListBox.Items.Add("Option6") [void] $objListBox.Items.Add("Option7") # Force list box to display on top of other windows. $objForm.TopMost = $true # Display list box. $objForm.Add_Shown({ $objForm.Activate() }) [void] $objForm.ShowDialog() # Show result. $x </code></pre> <p>The second code block results in this:</p> <p><img src="https://i.stack.imgur.com/WnTt8.jpg" alt="Broken list box"></p> <p>What am I doing wrong, here?</p> <p>Note: I'm running PowerShell 3.0 on Windows 7</p>
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