redefinition errors in WinSock2.h [duplicate]

Answer 1

My educated guess would be the order of included headers, i.e. include winsock2.h first (with first meaning before windows.h), or define WIN32_LEAN_AND_MEAN before including windows.h, which prevents windows.h from including winsock v1.

#include <winsock2.h>
#include <windows.h>

-or-

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>

Answer 2

After some headache: I made sure that an #include "Winsock2.h" is before any #include "windows.h" and "#include "Winsock.h" and this solved the case.

I checked the recursive includes, I spotted the header files which include (recursively) some #include "windows.h" and "#include "Winsock.h" and write a #include "Winsock2.h". in this files, i added #include "Winsock2.h" as the first include.

Just a matter of patience, look at includes one by one and establish this order, first #include "Winsock2.h" then #include "windows.h"