Take Screenshot in running Window

	Function Take-ScreenShot { <#
	.SYNOPSIS
	Used to take a screenshot of the desktop or the active window.
	.DESCRIPTION
	Used to take a screenshot of the desktop or the active window and save to an image file if needed.
	.PARAMETER screen
	Screenshot of the entire screen
	.PARAMETER activewindow
	Screenshot of the active window
	.PARAMETER file
	Name of the file to save as. Default is image.bmp
	.PARAMETER imagetype
	Type of image being saved. Can use JPEG,BMP,PNG. Default is bitmap(bmp)
	.PARAMETER print
	Sends the screenshot directly to your default printer
	.INPUTS
	.OUTPUTS
	.NOTES
	Name: Take-ScreenShot
	Author: Boe Prox
	DateCreated: 07/25/2010
	.EXAMPLE
	Take-ScreenShot -activewindow
	Takes a screen shot of the active window
	.EXAMPLE
	Take-ScreenShot -Screen
	Takes a screenshot of the entire desktop
	.EXAMPLE
	Take-ScreenShot -activewindow -file "C:\image.bmp" -imagetype bmp
	Takes a screenshot of the active window and saves the file named image.bmp with the image being bitmap
	.EXAMPLE
	Take-ScreenShot -screen -file "C:\image.png" -imagetype png
	Takes a screenshot of the entire desktop and saves the file named image.png with the image being png
	.EXAMPLE
	Take-ScreenShot -Screen -print
	Takes a screenshot of the entire desktop and sends to a printer
	.EXAMPLE
	Take-ScreenShot -ActiveWindow -print
	Takes a screenshot of the active window and sends to a printer
	#>
	#Requires -Version 2
	[cmdletbinding(
	SupportsShouldProcess = $True,
	DefaultParameterSetName = "screen",
	ConfirmImpact = "low"
	)]
	Param (
	[Parameter(
	Mandatory = $False,
	ParameterSetName = "screen",
	ValueFromPipeline = $True)]
	[switch]$screen,
	[Parameter(
	Mandatory = $False,
	ParameterSetName = "window",
	ValueFromPipeline = $False)]
	[switch]$activewindow,
	[Parameter(
	Mandatory = $False,
	ParameterSetName = "",
	ValueFromPipeline = $False)]
	[string]$file,
	[Parameter(
	Mandatory = $False,
	ParameterSetName = "",
	ValueFromPipeline = $False)]
	[string]
	[ValidateSet("bmp","jpeg","png")]
	$imagetype = "bmp",
	[Parameter(
	Mandatory = $False,
	ParameterSetName = "",
	ValueFromPipeline = $False)]
	[switch]$print
	)
	# C# code
	$code = @'
	using System;
	using System.Runtime.InteropServices;
	using System.Drawing;
	using System.Drawing.Imaging;
	namespace ScreenShotDemo
	{
	/// <summary>
	/// Provides functions to capture the entire screen, or a particular window, and save it to a file.
	/// </summary>
	public class ScreenCapture
	{
	/// <summary>
	/// Creates an Image object containing a screen shot the active window
	/// </summary>
	/// <returns></returns>
	public Image CaptureActiveWindow()
	{
	return CaptureWindow( User32.GetForegroundWindow() );
	}
	/// <summary>
	/// Creates an Image object containing a screen shot of the entire desktop
	/// </summary>
	/// <returns></returns>
	public Image CaptureScreen()
	{
	return CaptureWindow( User32.GetDesktopWindow() );
	}
	/// <summary>
	/// Creates an Image object containing a screen shot of a specific window
	/// </summary>
	/// <param name="handle">The handle to the window. (In windows forms, this is obtained by the Handle property)</param>
	/// <returns></returns>
	private Image CaptureWindow(IntPtr handle)
	{
	// get te hDC of the target window
	IntPtr hdcSrc = User32.GetWindowDC(handle);
	// get the size
	User32.RECT windowRect = new User32.RECT();
	User32.GetWindowRect(handle,ref windowRect);
	int width = windowRect.right - windowRect.left;
	int height = windowRect.bottom - windowRect.top;
	// create a device context we can copy to
	IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
	// create a bitmap we can copy it to,
	// using GetDeviceCaps to get the width/height
	IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,width,height);
	// select the bitmap object
	IntPtr hOld = GDI32.SelectObject(hdcDest,hBitmap);
	// bitblt over
	GDI32.BitBlt(hdcDest,0,0,width,height,hdcSrc,0,0,GDI32.SRCCOPY);
	// restore selection
	GDI32.SelectObject(hdcDest,hOld);
	// clean up
	GDI32.DeleteDC(hdcDest);
	User32.ReleaseDC(handle,hdcSrc);
	// get a .NET image object for it
	Image img = Image.FromHbitmap(hBitmap);
	// free up the Bitmap object
	GDI32.DeleteObject(hBitmap);
	return img;
	}
	/// <summary>
	/// Captures a screen shot of the active window, and saves it to a file
	/// </summary>
	/// <param name="filename"></param>
	/// <param name="format"></param>
	public void CaptureActiveWindowToFile(string filename, ImageFormat format)
	{
	Image img = CaptureActiveWindow();
	img.Save(filename,format);
	}
	/// <summary>
	/// Captures a screen shot of the entire desktop, and saves it to a file
	/// </summary>
	/// <param name="filename"></param>
	/// <param name="format"></param>
	public void CaptureScreenToFile(string filename, ImageFormat format)
	{
	Image img = CaptureScreen();
	img.Save(filename,format);
	}
	/// <summary>
	/// Helper class containing Gdi32 API functions
	/// </summary>
	private class GDI32
	{
	public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter
	[DllImport("gdi32.dll")]
	public static extern bool BitBlt(IntPtr hObject,int nXDest,int nYDest,
	int nWidth,int nHeight,IntPtr hObjectSource,
	int nXSrc,int nYSrc,int dwRop);
	[DllImport("gdi32.dll")]
	public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC,int nWidth,
	int nHeight);
	[DllImport("gdi32.dll")]
	public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
	[DllImport("gdi32.dll")]
	public static extern bool DeleteDC(IntPtr hDC);
	[DllImport("gdi32.dll")]
	public static extern bool DeleteObject(IntPtr hObject);
	[DllImport("gdi32.dll")]
	public static extern IntPtr SelectObject(IntPtr hDC,IntPtr hObject);
	}
	/// <summary>
	/// Helper class containing User32 API functions
	/// </summary>
	private class User32
	{
	[StructLayout(LayoutKind.Sequential)]
	public struct RECT
	{
	public int left;
	public int top;
	public int right;
	public int bottom;
	}
	[DllImport("user32.dll")]
	public static extern IntPtr GetDesktopWindow();
	[DllImport("user32.dll")]
	public static extern IntPtr GetWindowDC(IntPtr hWnd);
	[DllImport("user32.dll")]
	public static extern IntPtr ReleaseDC(IntPtr hWnd,IntPtr hDC);
	[DllImport("user32.dll")]
	public static extern IntPtr GetWindowRect(IntPtr hWnd,ref RECT rect);
	[DllImport("user32.dll")]
	public static extern IntPtr GetForegroundWindow();
	}
	}
	}
	'@
	#User Add-Type to import the code
	add-type $code -ReferencedAssemblies 'System.Windows.Forms','System.Drawing'
	#Create the object for the Function
	$capture = New-Object ScreenShotDemo.ScreenCapture
	#Take screenshot of the entire screen
	If ($Screen) {
	Write-Verbose "Taking screenshot of entire desktop"
	#Save to a file
	If ($file) {
	If ($file -eq "") {
	$file = "$pwd\image.bmp"
	}
	Write-Verbose "Creating screen file: $file with imagetype of $imagetype"
	$capture.CaptureScreenToFile($file,$imagetype)
	}
	ElseIf ($print) {
	$img = $Capture.CaptureScreen()
	$pd = New-Object System.Drawing.Printing.PrintDocument
	$pd.Add_PrintPage({$_.Graphics.DrawImage(([System.Drawing.Image]$img), 0, 0)})
	$pd.Print()
	}
	Else {
	$capture.CaptureScreen()
	}
	}
	#Take screenshot of the active window
	If ($ActiveWindow) {
	Write-Verbose "Taking screenshot of the active window"
	#Save to a file
	If ($file) {
	If ($file -eq "") {
	$file = "$pwd\image.bmp"
	}
	Write-Verbose "Creating activewindow file: $file with imagetype of $imagetype"
	$capture.CaptureActiveWindowToFile($file,$imagetype)
	}
	ElseIf ($print) {
	$img = $Capture.CaptureActiveWindow()
	$pd = New-Object System.Drawing.Printing.PrintDocument
	$pd.Add_PrintPage({$_.Graphics.DrawImage(([System.Drawing.Image]$img), 0, 0)})
	$pd.Print()
	}
	Else {
	$capture.CaptureActiveWindow()
	}
	}
	} ---------------------------------------------------------------------------- https://github.com/skverma021/Windows-Tricks/blob/master/Take-ScreenShot.ps1 ----------------------------------------------------------------------------