Empty Strings in Visual Basic API
"Empty string" is either a fixed size string (ByVal As String * size) filled with spaces or a variable/fixed length string that has chr$(0) in the first position. As a rule, if an input parameter can be referred to as an "empty string," it could be either one of the above described. If the same applies to the return value, it can only be the second one (to allow easy testing for an empty string).