How to capture the hidden program window？

[ioripalm]

How to capture the hidden program window？
For example:

#include <ScreenCapture.au3>
$runPID = Run ("C:\OK.exe", "C:\",@SW_HIDE)
$runPID = WinGetHandleFromPID($runPID) 
$hBmp = _ScreenCapture_CaptureWnd ("C:\OK.jpg", $runPID)

Func WinGetHandleFromPID($iSearchPID, $tolerance = 2000)
    Sleep($tolerance); give the Window a chance to load
    Local $aList = WinList()
    For $i = 1 To $aList[0][0]
        If WinGetProcess($aList[$i][1]) = $iSearchPID Then Return $aList[$i][1]
    Next
    Return SetError(1, 0, False)
EndFunc   ;==>WinGetHandleFromPID

Unable to capture the hidden window, ask how to solve? You can be given code?

Thank you Very Much!!!!!

Edited August 10, 2015 by ioripalm

[water]

Welcome to Autoit and the forum!
Did you read the help file for _ScreenCapture_CaptureWnd? The second parameter is a handle to the window to be captured not a process ID.

[guestscripter]

I tried this

#include <ScreenCapture.au3>

Local $iPID = Run("notepad.exe", "", @SW_HIDE)
Local $hWnd = WinGetHandleFromPID($iPID)
If IsHWnd($hWnd) Then
    _ScreenCapture_CaptureWnd(@ScriptDir & "\OK.jpg", $hWnd)
    ShellExecute(@ScriptDir & "\OK.jpg")
    ConsoleWrite("Success" & @CR)
Else
    ConsoleWrite("Error" & @CR)
EndIf
ProcessClose($iPID)
Exit

Func WinGetHandleFromPID($iSearchPID, $tolerance = 2000)
    Sleep($tolerance); give the Window a chance to load
    Local $aList = WinList()
    For $i = 1 To $aList[0][0]
        If WinGetProcess($aList[$i][1]) = $iSearchPID Then Return $aList[$i][1]
    Next
    Return SetError(1, 0, False)
EndFunc   ;==>WinGetHandleFromPID

It works fine without the @SW_HIDE, saves a screenshot of the Notepad window.

with the @SW_HIDE, it just saves a screenshot of the area of the desktop where Notepad window would be

I looked inside the <ScreenCapture> Include, and it looks to me like _ScreenCapture_CaptureWnd isn't designed for non-visible windows.

It basically just gets the location and size of the window, and then calls _ScreenCapture_Capture to capture an image of that area of the screen.

 

Edited August 9, 2015 by guestscripter

[water]

I think the name of the function says it all: It captures what is on the screen. If you can't see it it can't be captured.

[guestscripter]

Agreed. And ScreenCapture is great as it is, top of the hat and all.

Though then maybe there exists a different/better function someone has created for capturing windows without showing them to the user?

 

One workaround that came to mind with ScreenCapture:

WinSetState($hWnd, "", @SW_SHOW)
    _ScreenCapture_CaptureWnd(@ScriptDir & "\OK.jpg", $hWnd)
    WinSetState($hWnd, "", @SW_HIDE)

Which then just briefly has the Window appear.

[water]

Why capture a hidden window at all? Is it for debugging reasons?
If yes, there could be other ways to debug the script.

[guestscripter]

Why capture a hidden window at all? Is it for debugging reasons?
If yes, there could be other ways to debug the script.

Fair question...

How about to capture the state of a "control" that cannot be accessed with something like WinGetText

I suppose IUIAutomation may be the direction to go...

 

Edit: better example of use maybe: Capturing Internet Explorer's rendering of a web page to an image file in the background

Edited August 9, 2015 by guestscripter

[mikell]

Answer for the Edit : this exists  for IE using AutoItObject.au3  

[ioripalm]

Why capture a hidden window at all? Is it for debugging reasons?
If yes, there could be other ways to debug the script.

Maybe I do not know the expression, how to get to a hidden window screenshot, of course _ScreenCapture_CaptureWnd can not do, I ask how can we get to a hidden window screenshot?

[ioripalm]

Welcome to Autoit and the forum!
Did you read the help file for _ScreenCapture_CaptureWnd? The second parameter is a handle to the window to be captured not a process ID.

I modified the code, if _ScreenCapture_CaptureWnd can not achieve their goals, how to do the job it?

[water]

I do not know if the job of capturing a hidden window can be done at all.
I wanted to know why you need to capture a hidden window? What is it for?
Maybe there are other ways to achieve what you want to do.

[AutoBert]

The easiest way is to show the hidden window, capture it and then hide again.

[ioripalm]

The easiest way is to show the hidden window, capture it and then hide again.

Thank you for your help!

[UEZ]

You can use the _WinAPI_PrintWindow function to capture a window which is behind other windows. I used that function in my Windows Screenshooter app (https://www.autoitscript.com/forum/topic/122941-autoit-windows-screenshooter-v179-build-2015-02-25).

 

Edited September 7, 2015 by UEZ

[ioripalm]

You can use the _WinAPI_PrintWindow function to capture a window which is behind other windows. I used that function in my Windows Screenshooter app (https://www.autoitscript.com/forum/topic/122941-autoit-windows-screenshooter-v179-build-2015-02-25).

I try this:

expandcollapse popup

#include <GuiConstantsEx.au3>
#include <GDIPlus.au3>
Global Const $dll = DllOpen("user32.dll")
Global Const $g32_dll = DllOpen("gdi32.dll")
Global $hDC_Region, $hObj, $hMemDC, $memBitmap, $aFullScreen, $hFullScreen,$hBMP,$hBitmap_s
$hFullScreen = WinGetHandle("[TITLE:Program Manager;CLASS:Progman]")
$aFullScreen = WinGetPos($hFullScreen)
_Main()
Func _Main()
    _GDIPlus_Startup()
    Local $hGUI, $hBMP, $hBitmap, $hGraphic
;~  $runPID = Run("C:\WINDOWS\NOTEPAD.exe")
    $runPID = Run("C:\WINDOWS\NOTEPAD.exe","",@SW_HIDE)
    $hWnd = WinGetHandleFromPID($runPID)

    Sleep(200)

    $hBMP = Capture_Window($hWnd,667,420)
    
    $hGUI = GUICreate("TEST", 800, 600)
    GUISetState()

    $hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
    _GDIPlus_GraphicsDrawImage($hGraphic, $hBMP, 0, 0)

    _GDIPlus_GraphicsDispose($hGraphic)
    _GDIPlus_BitmapDispose($hBitmap)
    _WinAPI_DeleteObject($hBMP)

    _GDIPlus_Shutdown()

    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE
EndFunc   ;==>_Main

Func Capture_Window($hWnd, $w, $h)
    _GDIPlus_BitmapDispose($hBMP) ;otherwise memory leak
    _WinAPI_DeleteObject($hBitmap_s)
    $undo_chk = False
    Local $hDC_Capture = _WinAPI_GetDC(HWnd($hWnd))

    Local $hMemDC = _WinAPI_CreateCompatibleDC($hDC_Capture)

    $hBitmap_s = _WinAPI_CreateCompatibleBitmap($hDC_Capture, $w, $h)

    Local $hObjectOld = _WinAPI_SelectObject($hMemDC, $hBitmap_s)

    DllCall($g32_dll, "int", "SetStretchBltMode", "hwnd", $hDC_Capture, "uint", 4)
    Local $at = DllCall($dll, "int", "PrintWindow", "hwnd", $hWnd, "handle", $hMemDC, "int", 0)

    _WinAPI_DeleteDC($hMemDC)
    _WinAPI_SelectObject($hMemDC, $hObjectOld)
    _WinAPI_ReleaseDC($hWnd, $hDC_Capture)

    Local $c1 = $aFullScreen[2] - @DesktopWidth, $c2 = $aFullScreen[3] - @DesktopHeight
    Local $wc1 = $w - $c1, $hc2 = $h - $c2

    If (($wc1 > 1 And $wc1 < $w) Or ($w - @DesktopWidth > 1) Or ($hc2 > 7 And $hc2 < $h) Or ($h - @DesktopHeight > 1)) And (BitAND(WinGetState(HWnd($hWnd)), 32) = 32) Then
        Local $hBmp_t = _GDIPlus_BitmapCreateFromHBITMAP($hBitmap_s)

        $hBMP = _GDIPlus_BitmapCloneArea($hBmp_t, 8, 8, $w - 16, $h - 16)
        _GDIPlus_BitmapDispose($hBmp_t)
    Else
        $hBMP = _GDIPlus_BitmapCreateFromHBITMAP($hBitmap_s)
    EndIf
Return $hBMP
EndFunc   ;==>Capture_Window

Func WinGetHandleFromPID($iSearchPID, $tolerance = 2000)
    Sleep($tolerance); give the Window a chance to load
    Local $aList = WinList()
    For $i = 1 To $aList[0][0]
        If WinGetProcess($aList[$i][1]) = $iSearchPID Then Return $aList[$i][1]
    Next
    Return SetError(1, 0, False)
EndFunc   ;==>WinGetHandleFromPID

But it not work,Please help me! Thank you !

[UEZ]

With hidden I mean other windows have overlapped partly or completely the window. Capturing windows with the flag @SW_HIDE is not possible this way.

I assume that hidden windows with @SW_HIDE falg cannot be captured at all.

[ioripalm]

With hidden I mean other windows have overlapped partly or completely the window. Capturing windows with the flag @SW_HIDE is not possible this way.

I assume that hidden windows with @SW_HIDE falg cannot be captured at all.

Thank You Very Much!

If you find a good way, please give me a message!