GetAdaptersInfo and GetAdaptersAddressess BufferLength Param

Question

I\'ve got some legacy code in C++ here that does some things I don\'t understand. I\'m running it in Visual C++ 2008 Express Edition on a machine running Windows XP.

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Answer 1

Indeed, Using Visual studio 6, I used to get the number of adapters by:

DWORD drc = GetAdaptersInfo(NULL, &(Buflen = 0L));

if (drc == ERROR_BUFFER_OVERFLOW)
  n = Buflen / sizeof(IP_ADAPTER_INFO);

It was all right, for instance for 2 adapters Buflen was set to 1280 and sizeof(IP_ADAPTER_INFO) was 640.

Now I am using Visual C++ 2008 Express and my result is truncated because the function still sets Buflen to 1280 but the value of sizeof(IP_ADAPTER_INFO) is now 648!

Is this a bug or am I missing something?