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MrCreatoR

Hook to prevent window from closing

4 posts in this topic

Hi,

I am trying to set a hook (by looking at other similar hooks) for specific window, to prevent a closing of that window (minimize it instead).

This is what i have so far:

#include <GUIConstants.au3>
#include <WindowsConstants.au3>
;

Global Const $WH_CALLWNDPROC = 4

$hWnd = WinGetHandle("[CLASS:OpWindow]")
$ThreadID = WinGetProcess($hWnd)

$Callback = DllCallbackRegister("_CallWndProc", "long", "int;wparam;lparam")
$HHOOK = DllCall("User32.dll", "hwnd", "SetWindowsHookEx", "int", $WH_CALLWNDPROC, _
        "ptr", DllCallbackGetPtr($Callback), "hwnd", 0, "dword", $ThreadID)

Sleep(5000)

Func _CallWndProc($nCode, $wParam, $lParam)
    If $nCode < 0 Then
        Local $a_Ret = DllCall("user32.dll", "long", "CallNextHookEx", _
                "hwnd", $HHOOK[0], "int", $nCode, "wparam", $wParam, "lparam", $lParam)
        
        Return $a_Ret[0]
    EndIf
    
    Local $CWPSTRUCT = DllStructCreate("long lParam;long wParam;uint Message;hwnd hWnd", $lParam)
    If @error Then Exit
    
    If DllStructGetData($CWPSTRUCT, "Message") = $WM_CLOSE Then
        ConsoleWrite("Here i need to minimize (or other operations) the window..." & @CRLF)
        ;Send("^h")
        Return 1
    EndIf
    
    $CWPSTRUCT = 0
EndFunc

Func OnAutoItExit()
    DllCall("user32.dll", "hwnd", "UnhookWindowsHookEx", "hwnd", $HHOOK[0])
    DllCallbackFree($Callback)
EndFunc

But the problem here is that the _CallWndProc even not registered, and not called. The same hook working well (taken from here) on AutoIt's GUI (the function _CallWndProc called anyway), but not on external window. What is wrong here?


Using OS: Win 7 Professional, Using AutoIt Ver(s): 3.3.6.1 / 3.3.8.1

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Is this intended to work differently than just specifying that you want the window to minimize instead of exit for $GUI_EVENT_CLOSE?

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Is this intended to work differently than just specifying that you want the window to minimize instead of exit for $GUI_EVENT_CLOSE?

I am not sure that i understand, $GUI_EVENT_CLOSE is for autoit's GUI, and i need it for external window.

Using OS: Win 7 Professional, Using AutoIt Ver(s): 3.3.6.1 / 3.3.8.1

AutoIt_Rus_Community.png AutoIt Russian Community

My Work...

AutoIt_Icon_small.pngProjects: ATT - Application Translate Tool {new}| BlockIt - Block files & folders {new}| SIP - Selected Image Preview {new}| SISCABMAN - SciTE Abbreviations Manager {new}| AutoIt Path Switcher | AutoIt Menu for Opera! | YouTube Download Center! | Desktop Icons Restorator | Math Tasks | KeyBoard & Mouse Cleaner | CaptureIt - Capture Images Utility | CheckFileSize Program

AutoIt_Icon_small.pngUDFs: OnAutoItErrorRegister - Handle AutoIt critical errors {new}| AutoIt Syntax Highlight {new}| Opera Library! | Winamp Library | GetFolderToMenu | Custom_InputBox()! | _FileRun UDF | _CheckInput() UDF | _GUIInputSetOnlyNumbers() UDF | _FileGetValidName() UDF | _GUICtrlCreateRadioCBox UDF | _GuiCreateGrid() | _PathSplitByRegExp() | _GUICtrlListView_MoveItems - UDF | GUICtrlSetOnHover_UDF! | _ControlTab UDF! | _MouseSetOnEvent() UDF! | _ProcessListEx - UDF | GUICtrl_SetResizing - UDF! | Mod. for _IniString UDFs | _StringStripChars UDF | _ColorIsDarkShade UDF | _ColorConvertValue UDF | _GUICtrlTab_CoverBackground | CUI_App_UDF | _IncludeScripts UDF | _AutoIt3ExecuteCode | _DragList UDF | Mod. for _ListView_Progress | _ListView_SysLink | _GenerateRandomNumbers | _BlockInputEx | _IsPressedEx | OnAutoItExit Handler | _GUICtrlCreateTFLabel UDF | WinControlSetEvent UDF | Mod. for _DirGetSizeEx UDF
 
AutoIt_Icon_small.pngExamples: 
ScreenSaver Demo - Matrix included | Gui Drag Without pause the script | _WinAttach()! | Turn Off/On Monitor | ComboBox Handler Example | Mod. for "Thinking Box" | Cool "About" Box | TasksBar Imitation Demo

Like the Projects/UDFs/Examples? Please rate the topic (up-right corner of the post header: Rating AutoIt_Rating.gif)

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AutoIt is simple, subtle, elegant. © AutoIt Team

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From what I remember, any hooks(except keyboard and mouse ones), require the callback procedure to be located inside a dll.. So you'd need a custom crafted dll to do what you want. :/

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