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GetAdaptersAddresses is supposed to return ERROR_BUFFER_OVERFLOW and set len to the required size when len is too small. So normally we would call the function once with a small len, and then again with the longer len. But, on Windows 2003, apparently you only get ERROR_BUFFER_OVERFLOW the *first* time you call the function with a too-small len--the next time you get ERROR_INVALID_PARAMETER. So this function would fail the second and later times it is called. So, make the first call using a large len. On Windows 2003, this will work the first time as long as there are not too many adapters. (It will still fail with ERROR_INVALID_PARAMETER if there are too many adapters, but this will happen infrequently because of the large buffer.) Other systems that always return ERROR_BUFFER_OVERFLOW when appropriate will enlarge the buffer if the initial len is too short.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).