<#
.SYNTAX       take-screenshot.ps1 [<directory>] [<interval>]
.DESCRIPTION  takes screenshots every 60 seconds and saves them into the current/given directory
.LINK         https://github.com/fleschutz/PowerShell
.NOTES        Author: Markus Fleschutz / License: CC0
#>

param($Directory = "$PWD", [int]$Interval = 60)

function TakeScreenshot { param([string]$FilePath)
	Add-Type -Assembly System.Windows.Forms            
	$ScreenBounds = [Windows.Forms.SystemInformation]::VirtualScreen
	$ScreenshotObject = New-Object Drawing.Bitmap $ScreenBounds.Width, $ScreenBounds.Height
	$DrawingGraphics = [Drawing.Graphics]::FromImage($ScreenshotObject)
	$DrawingGraphics.CopyFromScreen( $ScreenBounds.Location, [Drawing.Point]::Empty, $ScreenBounds.Size)
	$DrawingGraphics.Dispose()
	$ScreenshotObject.Save($FilePath)
	$ScreenshotObject.Dispose()
}

try {
	do {
		$Time = (Get-Date)
		$Filename = "$($Time.Year)-$($Time.Month)-$($Time.Day)-$($Time.Hour)-$($Time.Minute)-$($Time.Second).png"
		$FilePath = (Join-Path $Directory $Filename)

		write-output "Saving screenshot to $FilePath..."
		TakeScreenshot $FilePath
		Start-Sleep -Seconds $Interval
	} while (1)
	exit 0
} catch {
	write-error "ERROR: line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
	exit 1
}