windows.h and winsock2.h

Question

Following the sample for iocp in the latest SDK (Feb 2008), I tryed to move that code into a DLL project.
I have to include <windows.h> in order to compile the DLL entry function (something the wizard didn't generate btw), and according to MSDN I need to include <winsock2.h> to make my winsock calls. However, when I compile I get a large amount of redefintion errors originating from conflicts between winsock.h and winsock2.h. Evidently windows.h includes winsock.h.
What's the deal with these two headers?

Answer 1

Include <winsock2.h> first, then <windows.h>

Answer 2

#define _WINSOCKAPI_    // stops windows.h including winsock.h
#include <windows.h>
#include <winsock2.h>

Answer 3

That solution doesn't work, it yields a different set of errors.

Answer 4

If it produces different errors then you need to say which errors.

But the solution which always works is to include winsock2.h before windows.h.

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Answer 5

You can also #define WIN32_LEAN_AND_MEAN -- see http://msdn.microsoft.com/en-us/library/ms737629(VS.85).aspx for official details.

Answer 6

Have you included ws2_32.lib in your linker?