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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Sep 25, 1998



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Make Sure Data is Safe Before Unloading

To decide when it is safe to exit your program, use a DataUnsafe function. Set the DataModified variable to False when you load or save data, or when you start a new file. Set DataModified to "OK" to remove the current data:

 Dim DataModified As Boolean
Private Function DataUnsafe() As Boolean
	If DataModified Then
		Select Case MsgBox _
			("Save changes to the data?", vbYesNoCancel)
			Case vbYes
				' Save the data. SaveData should 
				' set DataModifed False if successful.
				DataUnsafe = DataModified
			Case vbNo
				' OK to clear data.
				DataUnsafe = False
			Case vbCancel
				' Cancel operation and keep data.
				DataUnsafe = True
		End Select
		' The data is not modified.
		DataUnsafe = False
	End If
End Function
Private Sub Form_Unload(Cancel As Integer)
	Cancel = DataUnsafe()
End Sub
Rod Stephens
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