Saves a screenshot of the current desktop to a file.

Export-Screenshot.ps1

<#
.SYNOPSIS
 	Saves a screenshot of the current desktop to a file.

.DESCRIPTION
	Saves a screenshot of the current desktop to a file. Supported extensions for the 
	image file are BMP, GIF, EXIF, JPG, PNG and TIFF.
	
.PARAMETER Path
	Mandatory. Specifies the path to the file that will be created.
 
.NOTES
    Version:        1.0
    Author:			Michael van der Nest
    Creation Date:	2013/07/25
    Purpose/Change: Initial script development
 
.EXAMPLE
	 Export-Screenshot -File 'H:\screenshot.png'
#>

[Reflection.Assembly]::LoadWithPartialName("System.Drawing") | Out-Null
Function Export-Screenshot() {
	[CmdletBinding()]
    param (
		[Parameter(Mandatory=$true)][string]$Path,
		[Parameter(Mandatory=$false)][string]$LogFile
	)
	
	Write-Verbose 'Performing operation "Export-Screenshot"'
	if ($LogFile) { 
		Log-Write -LogPath $sLogFile -LineValue 'Performing operation "Export-Screenshot"'
	}
	
	Get-WmiObject -Class Win32_DesktopMonitor | 
		% {
			$desktop = $_
			$bounds = [Drawing.Rectangle]::FromLTRB(0, 0, $desktop.ScreenWidth, $desktop.ScreenHeight)
			
			Write-Verbose "Desktop width $($bounds.Width), height $($bounds.Height)"
			if ($LogFile) { 
				Log-Write -LogPath $sLogFile -LineValue "Desktop width $($bounds.Width), height $($bounds.Height)"
			}
			
			$bmp = New-Object Drawing.Bitmap $bounds.Width, $bounds.Height
			$graphics = [Drawing.Graphics]::FromImage($bmp)
			
			$graphics.CopyFromScreen($bounds.Location, [Drawing.Point]::Empty, $bounds.Size)		
			
			$bmp.Save($Path)
			
			Write-Verbose "Screenshot saved to $Path"
			if ($LogFile) { 
				Log-Write -LogPath $sLogFile -LineValue "Screenshot saved to $Path"
			}
			$graphics.Dispose()		
		}
}