Windows Change event

[anandchakru]

Hi everyone, I'm a NooB, can you help me figure out how to find when a window is switched. Say I have paint and notepad window opened, paint being active now. I need to take a screen shot before and after the window is switched from paint to notepad !!

Thanks,

`A

[martin]

Hi everyone, I'm a NooB, can you help me figure out how to find when a window is switched. Say I have paint and notepad window opened, paint being active now. I need to take a screen shot before and after the window is switched from paint to notepad !!

Thanks,

`A

You can get the active window in a number of different ways. One way is

$llastactive = ''
 While 1
     $activeWindow = WinGetTitle("")
     If $activeWindow <> $lastactive Then
         If $activeWindow = $PaintTitle Or $lastactive = $NotePAdTitle Then
             TakeScreenSHot();whatever you use here
         EndIf
         $lastactive = $activeWindow
     EndIf
 
     Sleep(100)
 WEnd

which would take a screenshot whenever one of the 2 programs becomes active.

EDIT: Welcome to the AutoIt forums anandchakru

Edited February 7, 2009 by martin

[sandin]

taken from siao's example the following script will hook your previous and your current window:

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#include <GuiConstantsEx.au3>
#include <Misc.au3>
#include <WindowsConstants.au3>
#include <ListboxConstants.au3>
#Include <SendMessage.au3>

Global Const $HSHELL_WINDOWACTIVATED = 4;
Global $bHook = 1
Global $previous_hwnd = "", $previous_title = ""
Global $current_hwnd = ""
Global $tooltip_display1 = ""
Global $tooltip_display2 = ""

Global $iGuiW = 400, $iGuiH = 50, $sTitle = "Shell Hooker", $aBtnText[2] = ["START", "STOP"]
$hGui = GUICreate($sTitle, $iGuiW, $iGuiH, -1, 0, $WS_POPUP+$WS_BORDER, $WS_EX_TOPMOST)

GUIRegisterMsg(RegisterWindowMessage("SHELLHOOK"), "HShellWndProc")
ShellHookWindow($hGui, $bHook)

GUISetState(@SW_HIDE)

While 1
    Sleep(1000)
WEnd

Func HShellWndProc($hWnd, $Msg, $wParam, $lParam)
    Switch $wParam
        Case $HSHELL_WINDOWACTIVATED
            Local $win_title = WinGetTitle($lParam)
            Local $win_handle = $lParam
            if $previous_hwnd <> "" Then $tooltip_display1 = "Previous window" & @CRLF & "Title: " & $previous_title & @CRLF & "Handle: " & $previous_hwnd & @CRLF
            $previous_hwnd = $win_handle
            $previous_title = $win_title
            $tooltip_display2 = $tooltip_display1 & @CRLF & "Current window" & @CRLF & "Title: " & $win_title & @CRLF & "Handle: " & $win_handle
            TrayTip("", $tooltip_display2, 30)
    EndSwitch
EndFunc

Func ShellHookWindow($hWnd, $bFlag)
    Local $sFunc = 'DeregisterShellHookWindow'
    If $bFlag Then $sFunc = 'RegisterShellHookWindow'
    Local $aRet = DllCall('user32.dll', 'int', $sFunc, 'hwnd', $hWnd)
    Return $aRet[0]
EndFunc
Func RegisterWindowMessage($sText)
    Local $aRet = DllCall('user32.dll', 'int', 'RegisterWindowMessage', 'str', $sText)
    Return $aRet[0]
EndFunc

and as for capturing window images if they are not visible (currently on top of the screen), use this: LINK

[anandchakru]

Thanks martin, for the warm and quick-reponse-welcome

sandin thank you.

Serves my question perfect !!

[notsure]

taken from siao's example the following script will hook your previous and your current window:

expandcollapse popup

#include <GuiConstantsEx.au3>
#include <Misc.au3>
#include <WindowsConstants.au3>
#include <ListboxConstants.au3>
#Include <SendMessage.au3>

Global Const $HSHELL_WINDOWACTIVATED = 4;
Global $bHook = 1
Global $previous_hwnd = "", $previous_title = ""
Global $current_hwnd = ""
Global $tooltip_display1 = ""
Global $tooltip_display2 = ""

Global $iGuiW = 400, $iGuiH = 50, $sTitle = "Shell Hooker", $aBtnText[2] = ["START", "STOP"]
$hGui = GUICreate($sTitle, $iGuiW, $iGuiH, -1, 0, $WS_POPUP+$WS_BORDER, $WS_EX_TOPMOST)

GUIRegisterMsg(RegisterWindowMessage("SHELLHOOK"), "HShellWndProc")
ShellHookWindow($hGui, $bHook)

GUISetState(@SW_HIDE)

While 1
    Sleep(1000)
WEnd

Func HShellWndProc($hWnd, $Msg, $wParam, $lParam)
    Switch $wParam
        Case $HSHELL_WINDOWACTIVATED
            Local $win_title = WinGetTitle($lParam)
            Local $win_handle = $lParam
            if $previous_hwnd <> "" Then $tooltip_display1 = "Previous window" & @CRLF & "Title: " & $previous_title & @CRLF & "Handle: " & $previous_hwnd & @CRLF
            $previous_hwnd = $win_handle
            $previous_title = $win_title
            $tooltip_display2 = $tooltip_display1 & @CRLF & "Current window" & @CRLF & "Title: " & $win_title & @CRLF & "Handle: " & $win_handle
            TrayTip("", $tooltip_display2, 30)
    EndSwitch
EndFunc

Func ShellHookWindow($hWnd, $bFlag)
    Local $sFunc = 'DeregisterShellHookWindow'
    If $bFlag Then $sFunc = 'RegisterShellHookWindow'
    Local $aRet = DllCall('user32.dll', 'int', $sFunc, 'hwnd', $hWnd)
    Return $aRet[0]
EndFunc
Func RegisterWindowMessage($sText)
    Local $aRet = DllCall('user32.dll', 'int', 'RegisterWindowMessage', 'str', $sText)
    Return $aRet[0]
EndFunc

and as for capturing window images if they are not visible (currently on top of the screen), use this: LINK

Sandin, is it possible to stop prevent a process from starting before it started, with this code??

[sandin]

with this code? No.

This code is about hooking windows (not process).

you'll have to find a way to hook process.