Excel closes program crashes

[ozmike]

How do i detect if excel has EXITED by the user and the excel object is not valid..?

$xl = _ExcelBookOpen( "MY.XLS" )

; user Exits excel..

-------

; HOW TO DETECT xls EXITED?

; this dosen't work???

If IsObj($xl) = false Then

RETURN

ENDIF

_ExcelSheetActivate($xl,"1st Fortnight") ; ERROR

C:\Program Files\AutoIt3\Include\Excel.au3 (1063) : ==> Variable must be of type "Object".:

Local $iTemp = $oExcel.ActiveWorkbook.Sheets.Count

Local $iTemp = $oExcel.ActiveWorkbook^ ERROR

[jchd]

I'm afraid it would be difficult to check. AutoIt has been passed a reference to the object at creation and any action (method invokation) on this object can be performed only using that reference.

IsObj($var) is returning True if AutoIt sees that $var is an object variant and if the reference is zero. It doesn't know which kind of COM object it is and doesn't have to.

If an object is destroyed outside AutoIt, AutoIt has absolutely no way of being aware of the fact that the reference it knows has suddenly become invalid. Since checking anything w.r.t. the destroyed object has to be made thru the reference and since that reference is now invalid, you see that the situation is deemed to graceless failure.

The best bet is to make sure that objects created by AutoIt will be hidden to users so they don't mess with them. That, or hide PCs to users!

[ozmike]

When this error occurs can i trap it? ie does auto have a on error goto

or can i catch the error thrown by the Excel.au? Just curious

Thanks

mike

[picaxe]

I've used something like this

xl = _ExcelBookOpen("MY.XLS")
; get window title for _ExcelBookOpen
$sWkbookTitle = $xl.Application.Caption

; detect xls has been closed
If Not WinExists($sWkbookTitle) Then Return SetError(1, 0, 0)

[jchd]

That's a possibility, but it's certainly very clumsy to use before every "obj.dosomething".

[ozmike]

Thank u picaxe , ingenius solution!