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'**********************************************************************************************************
' Name: isBookValid
' Author: mielk | 2013-04-25
'
' Comment: Function to check if the given Excel workbook is valid and you can refer to its
' properties and methods without errors.
'
' Using this function is very helpful since it lets you avoid
' Run-time error '-2147221080 (800401a8)': Automation error.
' This error is generated, when the code tries to refer to a property or a method
' of an Excel workbook that had been already closed.
'
' Parameters:
' wkb The Excel workbook to be checked.
'
' Returns:
' Boolean True - if the given workbook is valid and you can refer to it without any errors.
' False - if the given workbook is invalid, that means it is corrupted or had been
' closed or deleted before this method has been called and referring to it
' will raise an error.
'
'
' --- Changes log -----------------------------------------------------------------------------------------
' 2013-04-25 mielk Function created.
'**********************************************************************************************************
Public Function isBookValid(wkb As Excel.Workbook) As Boolean
Const METHOD_NAME As String = "isBookValid"
'------------------------------------------------------------------------------------------------------
Dim strBookName As String
'------------------------------------------------------------------------------------------------------
On Error Resume Next
strBookName = wkb.name
'Check method is very easy - if the name of the given workbook has been assigned to the variable
'[strBookName], this workbook is valid and you can refer to it. Otherwise, error would be generated
'and step [strBookName = wkb.name] would be skipped because of [On Error Resume Next] statement above.
isBookValid = VBA.Len(strBookName)
End Function