Avoid "AutoIt Error" message box in unknown errors

[mLipok]

@Parsix

Here is my entire modified code:

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;~ https://www.autoitscript.com/forum/topic/154081-avoid-autoit-error-message-box-in-unknown-errors/page/4/#findComment-1547350

#Region - AutoIt3Wrapper directives section
; General section
#AutoIt3Wrapper_UseX64=n
#AutoIt3Wrapper_UseUpx=n
#AutoIt3Wrapper_Compression=4

; Au3Check section
#AutoIt3Wrapper_Au3Check_Parameters=-d -w 1 -w 2 -w 6 -w 7

; Au3Stripper section
#AutoIt3Wrapper_Run_Au3Stripper=y
#Au3Stripper_Parameters=/so /pe
#AutoIt3Wrapper_Au3Stripper_OnError=C

#EndRegion - AutoIt3Wrapper directives section

#include <WinApi.au3>

#Region - exmaple
AddHookApi("user32.dll", "MessageBoxW", "Intercept_MessageBoxW", "int", "hwnd;wstr;wstr;uint")
MsgBox(0, 'Test', 'Some normal MsgBox text')
DllStructCreate("byte[123456789097]") ; This is a deliberate action intended to display an error, as this script demonstrates how to change error handling - interact with MsgBox's title and text.
#EndRegion - exmaple

#Region @trancexx - https://www.autoitscript.com/forum/topic/154081-avoid-autoit-error-message-box-in-unknown-errors/#findComment-1111917
Func Intercept_MessageBoxW($hWnd, $sText, $sTitle, $iType)
    If $sTitle = 'AutoIt' Then $sTitle = 'TESTING: ' & StringReplace($sTitle, "AutoIt", @ScriptName)

    Local $aCall = DllCall("user32.dll", "int", "MessageBoxW", _
            "hwnd", $hWnd, _
            "wstr", $sText, _
            "wstr", $sTitle, _
            "uint", $iType)
    If @error Or Not $aCall[0] Then Return 0
    Return $aCall[0]
EndFunc   ;==>Intercept_MessageBoxW

; The magic is down below
Func AddHookApi($sModuleName, $vFunctionName, $vNewFunction, $sRet = "", $sParams = "")
    Local Static $pImportDirectory, $hInstance
    Local Const $IMAGE_DIRECTORY_ENTRY_IMPORT = 1
    If Not $pImportDirectory Then
        $hInstance = _WinAPI_GetModuleHandle(0)
        $pImportDirectory = ImageDirectoryEntryToData($hInstance, $IMAGE_DIRECTORY_ENTRY_IMPORT)
        If @error Then Return SetError(1, 0, 0)
    EndIf
    Local $iIsInt = IsInt($vFunctionName)
    Local $iRestore = Not IsString($vNewFunction)
    Local $tIMAGE_IMPORT_MODULE_DIRECTORY
    Local $pDirectoryOffset = $pImportDirectory
    Local $tModuleName
    Local $iInitialOffset, $iInitialOffset2
    Local $iOffset2
    Local $tBufferOffset2, $iBufferOffset2
    Local $tBuffer, $tFunctionOffset, $pOld, $fMatch, $pModuleName, $pFuncName
    Local Const $PAGE_READWRITE = 0x04
    While 1
        $tIMAGE_IMPORT_MODULE_DIRECTORY = DllStructCreate("dword RVAOriginalFirstThunk;" & _
                "dword TimeDateStamp;" & _
                "dword ForwarderChain;" & _
                "dword RVAModuleName;" & _
                "dword RVAFirstThunk", _
                $pDirectoryOffset)
        If Not DllStructGetData($tIMAGE_IMPORT_MODULE_DIRECTORY, "RVAFirstThunk") Then ExitLoop
        $pModuleName = $hInstance + DllStructGetData($tIMAGE_IMPORT_MODULE_DIRECTORY, "RVAModuleName")
        $tModuleName = DllStructCreate("char Name[" & _WinAPI_StringLenA($pModuleName) & "]", $pModuleName)
        If DllStructGetData($tModuleName, "Name") = $sModuleName Then ; function from this module
            $iInitialOffset = $hInstance + DllStructGetData($tIMAGE_IMPORT_MODULE_DIRECTORY, "RVAFirstThunk")
            $iInitialOffset2 = $hInstance + DllStructGetData($tIMAGE_IMPORT_MODULE_DIRECTORY, "RVAOriginalFirstThunk")
            If $iInitialOffset2 = $hInstance Then $iInitialOffset2 = $iInitialOffset
            $iOffset2 = 0
            While 1
                $tBufferOffset2 = DllStructCreate("dword_ptr", $iInitialOffset2 + $iOffset2)
                $iBufferOffset2 = DllStructGetData($tBufferOffset2, 1)
                If Not $iBufferOffset2 Then ExitLoop
                If $iIsInt Then
                    If BitAND($iBufferOffset2, 0xFFFFFF) = $vFunctionName Then $fMatch = True ; wanted function
                Else
                    $pFuncName = $hInstance + $iBufferOffset2 + 2 ; 2 is size od "word", see line below...
                    $tBuffer = DllStructCreate("word Ordinal; char Name[" & _WinAPI_StringLenA($pFuncName) & "]", $hInstance + $iBufferOffset2)
                    If DllStructGetData($tBuffer, "Name") == $vFunctionName Then $fMatch = True ; wanted function
                EndIf
                If $fMatch Then
                    $tFunctionOffset = DllStructCreate("ptr", $iInitialOffset + $iOffset2)
                    VirtualProtect(DllStructGetPtr($tFunctionOffset), DllStructGetSize($tFunctionOffset), $PAGE_READWRITE)
                    If @error Then Return SetError(3, 0, 0)
                    $pOld = DllStructGetData($tFunctionOffset, 1)
                    If $iRestore Then
                        DllStructSetData($tFunctionOffset, 1, $vNewFunction)
                    Else
                        DllStructSetData($tFunctionOffset, 1, DllCallbackGetPtr(DllCallbackRegister($vNewFunction, $sRet, $sParams)))
                    EndIf
                    Return $pOld
                EndIf
                $iOffset2 += DllStructGetSize($tBufferOffset2)
            WEnd
            ExitLoop
        EndIf
        $pDirectoryOffset += 20 ; size of $tIMAGE_IMPORT_MODULE_DIRECTORY
    WEnd
    Return SetError(4, 0, 0)
EndFunc   ;==>AddHookApi

Func VirtualProtect($pAddress, $iSize, $iProtection)
    Local $aCall = DllCall("kernel32.dll", "bool", "VirtualProtect", "ptr", $pAddress, "dword_ptr", $iSize, "dword", $iProtection, "dword*", 0)
    If @error Or Not $aCall[0] Then Return SetError(1, 0, 0)
    Return 1
EndFunc   ;==>VirtualProtect

Func ImageDirectoryEntryToData($hInstance, $iDirectoryEntry)
    ; Get pointer to data
    Local $pPointer = $hInstance
    ; Start processing passed binary data. 'Reading' PE format follows.
    Local $tIMAGE_DOS_HEADER = DllStructCreate("char Magic[2];" & _
            "word BytesOnLastPage;" & _
            "word Pages;" & _
            "word Relocations;" & _
            "word SizeofHeader;" & _
            "word MinimumExtra;" & _
            "word MaximumExtra;" & _
            "word SS;" & _
            "word SP;" & _
            "word Checksum;" & _
            "word IP;" & _
            "word CS;" & _
            "word Relocation;" & _
            "word Overlay;" & _
            "char Reserved[8];" & _
            "word OEMIdentifier;" & _
            "word OEMInformation;" & _
            "char Reserved2[20];" & _
            "dword AddressOfNewExeHeader", _
            $pPointer)
    Local $sMagic = DllStructGetData($tIMAGE_DOS_HEADER, "Magic")
    ; Check if it's valid format
    If Not ($sMagic == "MZ") Then Return SetError(1, 0, 0) ; MS-DOS header missing. Btw 'MZ' are the initials of Mark Zbikowski in case you didn't know.
    ; Move pointer
    $pPointer += DllStructGetData($tIMAGE_DOS_HEADER, "AddressOfNewExeHeader") ; move to PE file header
    ; In place of IMAGE_NT_SIGNATURE structure
    Local $tIMAGE_NT_SIGNATURE = DllStructCreate("dword Signature", $pPointer)
    ; Check signature
    If DllStructGetData($tIMAGE_NT_SIGNATURE, "Signature") <> 17744 Then ; IMAGE_NT_SIGNATURE
        Return SetError(2, 0, 0) ; wrong signature. For PE image should be "PE\0\0" or 17744 dword.
    EndIf
    ; Move pointer
    $pPointer += 4 ; size of $tIMAGE_NT_SIGNATURE structure
    ; In place of IMAGE_FILE_HEADER structure
    ; Move pointer
    $pPointer += 20 ; size of $tIMAGE_FILE_HEADER structure
    ; Determine the type
    Local $tMagic = DllStructCreate("word Magic;", $pPointer)
    Local $iMagic = DllStructGetData($tMagic, 1)
    Local $tIMAGE_OPTIONAL_HEADER
    If $iMagic = 267 Then ; x86 version
        ; Move pointer
        $pPointer += 96 ; size of $tIMAGE_OPTIONAL_HEADER
    ElseIf $iMagic = 523 Then ; x64 version
        ; Move pointer
        $pPointer += 112 ; size of $tIMAGE_OPTIONAL_HEADER
    Else
        Return SetError(3, 0, 0) ; unsupported module type
    EndIf
    ; Validate input by checking available number of structures that are in the module
    Local Const $IMAGE_NUMBEROF_DIRECTORY_ENTRIES = 16 ; predefined value that PE modules always use (AutoIt certainly)
    If $iDirectoryEntry > $IMAGE_NUMBEROF_DIRECTORY_ENTRIES - 1 Then Return SetError(4, 0, 0) ; invalid input
    ; Calculate the offset to wanted entry (every entry is 8 bytes)
    $pPointer += 8 * $iDirectoryEntry
    ; At place of correst directory entry
    Local $tIMAGE_DIRECTORY_ENTRY = DllStructCreate("dword VirtualAddress; dword Size", $pPointer)
    ; Collect data
    Local $pAddress = DllStructGetData($tIMAGE_DIRECTORY_ENTRY, "VirtualAddress")
    If $pAddress = 0 Then Return SetError(5, 0, 0) ; invalid input
    ; $pAddress is RVA, add it to base address
    Return $hInstance + $pAddress
EndFunc   ;==>ImageDirectoryEntryToData
#EndRegion @trancexx - https://www.autoitscript.com/forum/topic/154081-avoid-autoit-error-message-box-in-unknown-errors/#findComment-1111917

 

Please note that I also modified this line:

Func Intercept_MessageBoxW($hWnd, $sText, $sTitle, $iType)
    If $sTitle = 'AutoIt' Then $sTitle = 'TESTING: ' & StringReplace($sTitle, "AutoIt", @ScriptName)
    ...
    ...
    "wstr", $sTitle, _
    ...
    ...
EndIf

 

Edited Wednesday at 09:56 AM by mLipok

[Jos]

8 hours ago, Parsix said:

Crashed, no show any error

Nice to see such a descriptive result. I am sure you will figure it out. 

[argumentum]

$blah = DllStructCreate("byte[99999999999]")
    ConsoleWrite(DllStructGetSize($blah) & @CRLF) ; sets to 2147483647 in x64, crash in x86

Should crash both ( 64 and 32 bit ) or adjust to max in both. Yes, No, maybe ?.
Unless explained why it makes sense as is, it'd deserve a trac entry.

I looked at it because I was looking at my UDF to catch the "oops, I messed up".

[mLipok]

On 11/12/2025 at 10:16 AM, mLipok said:

use:
 

#AutoIt3Wrapper_UseX64=n

 

@Danyfirex my friend. Would you be so kind as to take a look at the code below to see why it requires only the 32-bit version?
Perhaps you can create a fix that will allow this code to work in both 32-bit and 64-bit versions.

Maybe someone else here also would be able to help with creating an appropriate fix?

 

[mLipok]

On 11/12/2025 at 5:44 PM, Jos said:

Nice to see such a descriptive result. I am sure you will figure it out. 

It was related to using 64bit AutoIt version and using 
 

#AutoIt3Wrapper_Au3Stripper_OnError=f

instead:
 

#AutoIt3Wrapper_Au3Stripper_OnError=c

For this reason, I also tried to ask you to explain why using the following directive with the FORCE parameter:

#AutoIt3Wrapper_Au3Stripper_OnError=f

warry on the results - I mean changes that compiled version works or not.

[argumentum]

1 hour ago, mLipok said:

It was related to using 64bit

https://www.autoitscript.com/forum/topic/154081-avoid-autoit-error-message-box-in-unknown-errors/page/4/#findComment-1547359

[mLipok]

54 minutes ago, argumentum said:

https://www.autoitscript.com/forum/topic/154081-avoid-autoit-error-message-box-in-unknown-errors/page/4/#findComment-1547359

Sitll we are not talking about the fact that AutoIt crashes.
We are talking about: Why @trancexx code is not working in 64bit.

 

[Jos]

On 11/12/2025 at 10:30 AM, mLipok said:

@Jos Could you be so kind as to explain why the following directive does not work well with @Parsix code?

#AutoIt3Wrapper_Au3Stripper_OnError=f

 

Sorry, hadn't seen this one as I was avoiding this topic after seeing only questions and no clear answers!
Anyway, no idea what you are asking me, as I do not know what "doesn't work" means and am too lazy to start trying to sort out what it could mean! 😉 

[Jos]

41 minutes ago, mLipok said:

Sitll we are not talking about the fact that AutoIt crashes.
We are talking about: Why @trancexx code is not working in 64bit.

Is this a fact or your guess as I don't see any proof during my quick scan of this thread, or did I miss that?