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@Parsix Here is my entire modified code: ;~ 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

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.

sure thing. - yeah, there are no window handles per se - apart from the WinID of the main window. Everything is done on objects. so that colour change would be something like: $pBrush = CreateSolidBrush("Red") IBorder_SetBackground($apBorders[0], $pBrush) IUnknown_Release($pBrush) In the Sept 3rd. example, to keep things tidy I release the border objects once they're created. So you'd need either need to change the background before releasing, or get the border object back by some other means. Via its parent for example - in this case the grid object (before it too is released!). As for triggering the color change - In this example, once we get into the main loop everything is event based. When we hit the following line the script won't continue until the dispatch loop is broken with _WinUI3_PostQuitMessage. IDispatcherQueue3_RunEventLoop($pDispatchQ) The general idea is to create a bunch of handlers with _WinRT_CreateDelegate(). But if you'd rather work within a while loop, it is possible to create your own dispatcher with _WinUI3_GetMsg / _WinUI3_DispatchMessage. I think there are probably examples of this early in the thread!

Yep, that could work well. Only drawback is the true use of the dead key misconverted into an accented characters. But it is less an issue when you know what you are doing...