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Rei10

How to take a screenshot of a hidden area of ​​the screen?

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Uez, thank you. There is a lot of superfluous in the code.
Here is the best solution if someone is looking:
1. Make the window visible and hidden behind the program form.
2. I take a screenshot of an inactive window.

#include <GDIPlus.au3>
#include <WinAPIEx.au3>
#include <APIConstants.au3>

$iHandle = WinGetHandle('[CLASS:Notepad]')

_GDIPlus_Startup()
$hBitmap = Capture_Window($iHandle)
_GDIPlus_ImageSaveToFile($hBitmap, @ScriptDir & "\Test.jpg")
_GDIPlus_BitmapDispose($hBitmap)
;ShellExecute(@ScriptDir & "\Test.jpg")
_GDIPlus_Shutdown()

Func Capture_Window($hWnd)
    Local $hDC_Capture = _WinAPI_GetWindowDC($hWnd)
    Local $hMemDC = _WinAPI_CreateCompatibleDC($hDC_Capture)
    Local $hHBitmap = _WinAPI_CreateCompatibleBitmap($hDC_Capture, _WinAPI_GetWindowWidth($hWnd), _WinAPI_GetWindowHeight($hWnd))
    Local $hObjectOld = _WinAPI_SelectObject($hMemDC, $hHBitmap)
    DllCall("user32.dll", "int", "PrintWindow", "hwnd", $hWnd, "handle", $hMemDC, "int", 0)
    Local $hBmp = _GDIPlus_BitmapCreateFromHBITMAP($hHBitmap)
    _WinAPI_SelectObject($hMemDC, $hObjectOld)
    _WinAPI_DeleteObject($hHBitmap)
    _WinAPI_DeleteDC($hMemDC)
    _WinAPI_ReleaseDC($hWnd, $hDC_Capture)
    Return $hBmp
EndFunc

 

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Even in yours, you got superfluous code :

#include <WinAPIGdi.au3>
#include <ScreenCapture.au3>

Local $hWnd = WinGetHandle("[CLASS:Notepad]")
Capture_Window($hWnd, 650, 500)
ShellExecute("test.jpg")

Func Capture_Window($hWnd, $w, $h)
  Local $hDC_Capture = _WinAPI_GetDC($hWnd)
  Local $hMemDC = _WinAPI_CreateCompatibleDC($hDC_Capture)
  Local $hHBitmap = _WinAPI_CreateCompatibleBitmap($hDC_Capture, $w, $h)
  Local $hObject = _WinAPI_SelectObject($hMemDC, $hHBitmap)
  _WinAPI_PrintWindow($hWnd, $hMemDC)
  _ScreenCapture_SaveImage("test.jpg", $hHBitmap)
  _WinAPI_DeleteDC($hMemDC)
  _WinAPI_ReleaseDC($hWnd, $hDC_Capture)
  _WinAPI_DeleteObject($hHBitmap)
EndFunc   ;==>Capture_Window

:)

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The solution UEZ posted takes a screenshot invisibly and not only in the background, but of course is limited to webpages, which seems to be the intention of the OP.

Here's my latest update on the code provided originally by ward:

 

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