Excel closed independantly

[myids]

Could find this topic through search:

If $oExcel Then
        $Index = 0
        For $i = 1 To 200 ;Loop
            $cindex = $Index + 1
            $sCellValue = _ExcelReadCell($oExcel, $i, 1)
            $cell_net = StringStripWS($sCellValue, 3)
            If $cell_net = "Netname" Then
                $cell_net = ""
            EndIf
            ;ConsoleWrite( $cell_net & @CRLF)
            ;MsgBox(0, "", "cell_net is: " & @CRLF & $cell_net, 2)
            If StringLen($cell_net) Then
                $nlgth = FindNetinArray($cell_net)
                _ExcelWriteCell($oExcel, $nlgth, $i, 2)
            EndIf
            $Index = $Index + 1
        Next
    Else
        $oExcel = ""
        MsgBox(0, "SpreadSheet Was Not Open", "SpreadSheet Was Not Open" & @CRLF & "Open Spreadsheet, to Run a Length Check")
        ;OpenSS()
    EndIf

this is part of a function that is called after Excel is opened previous using _ExcelBookOpen.

It's possible to run this function from a menu. If Excel was closed via an Excel menu File/Exit then $oExcel in Null and fails the branch.

After re-opening the same exact file, $oExcel should be re-initialized but still fails the branch.

I have tried testing $oExcel.ActiveSheet.Name and others like $oExcel.ActiveWorkBook.Sheets.Count. But since the object doesn't exist any longer, the script crashes.

Any ideas how I can check if the object exists before testing the object property?

TIA

[99ojo]

Hi,

have a look at function IsObj ().

;-))

Stefan

[myids]

I have tried it, but didn't solve the issue.

If IsObj($oExcel) Then....

Is that the correct?

Or should this be checking a specific property?

TIA

[myids]

I see after some other searching that I am using the function properly. Do I also need to use some error handler at the same time?

If so, how do I set that up?

TIA

myids

[myids]

This is the error message for testing with IsObj($oExcel):

C:\Program Files (x86)\AutoIt3\Include\Excel.au3 (694) : ==> Variable must be of type "Object".:

Return $oExcel.Activesheet.Cells($sRangeOrRow, $iColumn).Value

Return $oExcel.Activesheet^ ERROR

At this point, $oExcel was closed, but AutoIt script does not know it, so, still falls through as if true and is crashing on the first object function:

$sCellValue = _ExcelReadCell($oExcel, $i, 1)

If IsObj($oExcel) Then
        $Index = 0
        For $i = 1 To 200 ;Loop
            $cindex = $Index + 1
            $sCellValue = _ExcelReadCell($oExcel, $i, 1)
            $cell_net = StringStripWS($sCellValue, 3)
            If $cell_net = "Netname" Then
                $cell_net = ""
            EndIf
            ;ConsoleWrite( $cell_net & @CRLF)
            ;MsgBox(0, "", "cell_net is: " & @CRLF & $cell_net, 2)
            If StringLen($cell_net) Then
                $nlgth = FindNetinArray($cell_net)
                _ExcelWriteCell($oExcel, $nlgth, $i, 2)
            EndIf
            $Index = $Index + 1
        Next
    Else
        $oExcel = ""
        MsgBox(0, "SpreadSheet Was Not Open", "SpreadSheet Was Not Open" & @CRLF & "Open Spreadsheet, to Run a Length Check")
        ;OpenSS()
    EndIf
EndFunc

Thanks very much.

myids

[jchd]

I understand your point, but I can't see exactly what AutoIt could do against that. The object handle/pointer/reference you have in AutoIt is unable to protect against the actual object being closed by magic wand acting from "above". Any method you would invoke would encounter the same "object has been destroyed" situation and cause graceless failure.

There should be a check which would stop destroying the object if created by another program/PID. But AFAIK this is the responsability of the class you instanciate, certainly not AutoIt. Perhaps a COM guru could shed some light on this as I'm on thin ice there. There is a seperate forum for COM specialized questions. Try there as well.

[myids]

Thanks.

I guess what I am looking for is one: what is the question I would need ask to the COM forum.

two: how do check if the object exists so I can handle it gracefully if it doesn't exist, instead of allowing the script to crash?

[jchd]

Your one is your two!

Try to ask there how to handle gracefully a situation where an AutoIt COM object being closed unexpectedly thru the object's GUI.

As I see it, IsObj is only a method of the AutoIt variant class which returns True if the variant was created as an object type (not a string, a number, nor anything else). And I don't see how it could ensure the COM object is still "there" except if the COMM machinery has special provision for such cases. This is what I don't know and where experienced COM gurus would have their word.

Best luck.