GetNextReceipt Method, Step7 (Visual Basic)

Public Function GetNextReceipt() As Long

    On Error GoTo ErrorHandler

    ' If Shared property does not already exist
    ' it will be initialized
    Dim spmMgr As SharedPropertyGroupManager
    Set spmMgr = CreateObject("MTxSpm.SharedPropertyGroupManager.1")

    Dim spmGroup As SharedPropertyGroup
    Dim bResult As Boolean
    Set spmGroup = _
        spmMgr.CreatePropertyGroup("Receipt", _
        LockMethod, Process, bResult)

    Dim spmPropNextReceipt As SharedProperty
    Set spmPropNextReceipt = _
        spmGroup.CreateProperty("Next", bResult)

    ' Set the initial value of the Shared Property to
    ' 0 if the Shared Property didn’t already exist.
    ' This is not entirely necessary but demonstrates 
    ' how to initialize a value.
    If bResult = False Then
        spmPropNextReceipt.Value = 0
    End If

    Dim spmPropMaxNum As SharedProperty
    Set spmPropMaxNum = spmGroup.CreateProperty("MaxNum", bResult)

    Dim objReceiptUpdate As Bank.UpdateReceipt
    If spmPropNextReceipt.Value >= spmPropMaxNum.Value Then
        Set objReceiptUpdate = GetObjectContext.CreateInstance("Bank.UpdateReceipt")
        spmPropNextReceipt.Value = objReceiptUpdate.Update
        spmPropMaxNum.Value = spmPropNextReceipt.Value + 100
    End If

    ' Get the next receipt number and update property
    spmPropNextReceipt.Value = spmPropNextReceipt.Value + 1

    ' we are finished and happy
    GetObjectContext.SetComplete

    GetNextReceipt = spmPropNextReceipt.Value

    Exit Function
    
ErrorHandler:
    GetObjectContext.SetAbort          ' we are unhappy

    ' indicate that an error occured
    GetNextReceipt = -1

    Err.Raise Err.Number, "Bank.GetReceipt.GetNextReceipt", Err.Description

End Function