Taking Screenshots with PowerShell on Windows 10

PowerShell

Even though Windows 10 has made taking screenshots so much easier, using PowerShell for the same task still gives a lot of good use. But PowerShell doesn’t have the capability of taking screenshots out of the box. You will need to leverage .NET for a few things.

Here is a good example of taking a full window screenshot using PowerShell.

$File = 'fullpath\filename.png'
Add-Type -AssemblyName System.Windows.Forms
Add-type -AssemblyName System.Drawing
# Gather Screen resolution information
$Screen = [System.Windows.Forms.SystemInformation]::VirtualScreen
$Width = $Screen.Width
$Height = $Screen.Height
$Left = $Screen.Left
$Top = $Screen.Top
# Create bitmap using the top-left and bottom-right bounds
$bitmap = New-Object System.Drawing.Bitmap $Width, $Height
# Create Graphics object
$graphic = [System.Drawing.Graphics]::FromImage($bitmap)
# Capture screen
$graphic.CopyFromScreen($Left, $Top, 0, 0, $bitmap.Size)
# Save to file
$bitmap.Save($File, [System.Drawing.Imaging.ImageFormat]::Png) 
Write-Output "Screenshot saved to:"
Write-Output $File

Running the script saves the current desktop in PNG format automatically at the location of your choice.

Guess what would be more useful? Taking the screenshot of a remote computer.

And that’s where the challenge comes in.

Since you will need to run the script as a currently logged-on user so it could take the screenshot on an active session, you can’t use Invoke-Command anymore.

The easy workaround is to use SysInternal’s popular PsExec command line to execute the script from a remote computer using the currently logged-in user’s session. Use the command line QUser to find the session ID if needed.

psexec -s -i $sessionID \$computer Powershell.exe -executionpolicy bypass -file "fullpath\script.ps1"

However, where I work, PsExec is blocked by the Anti-malware system because of its widespread popularity among hackers.

If you are using a paid version of PDQ Deploy, it’s relatively easy to set up a new package that runs the PowerShell script as a logged-on user.

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