Microsoft Visual Studio 10.0\VC\INCLUDE\system_error: error C2065

时间：2022-11-04 09:59:59
1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(23): error C2065: 'EAFNOSUPPORT' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(24): error C2065: 'EADDRINUSE' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(25): error C2065: 'EADDRNOTAVAIL' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(26): error C2065: 'EISCONN' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(27): error C2065: 'E2BIG' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(29): error C2065: 'EFAULT' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(30): error C2065: 'EBADF' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(31): error C2065: 'EBADMSG' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(32): error C2065: 'EPIPE' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(33): error C2065: 'ECONNABORTED' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(34): error C2065: 'EALREADY' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(35): error C2065: 'ECONNREFUSED' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(36): error C2065: 'ECONNRESET' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(37): error C2065: 'EXDEV' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(38): error C2065: 'EDESTADDRREQ' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(39): error C2065: 'EBUSY' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(40): error C2065: 'ENOTEMPTY' : undeclared identifier

     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(41): error C2065: 'ENOEXEC' : undeclared identifier
     1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\system_error(42): error C2065: 'EEXIST' : undeclared identifier

分析：
在<WinSock2.h>有如下宏定义
/*
  * Windows Sockets errors redefined as regular Berkeley error constants.
  * These are commented out in Windows NT to avoid conflicts with errno.h.
  * Use the WSA constants instead.
  */
 #if 0
 #define EWOULDBLOCK             WSAEWOULDBLOCK
 #define EINPROGRESS             WSAEINPROGRESS
 #define EALREADY                WSAEALREADY
 #define ENOTSOCK                WSAENOTSOCK
 #define EDESTADDRREQ            WSAEDESTADDRREQ
 #define EMSGSIZE                WSAEMSGSIZE
 #define EPROTOTYPE              WSAEPROTOTYPE
 #define ENOPROTOOPT             WSAENOPROTOOPT
 #define EPROTONOSUPPORT         WSAEPROTONOSUPPORT
 #define ESOCKTNOSUPPORT         WSAESOCKTNOSUPPORT
 #define EOPNOTSUPP              WSAEOPNOTSUPP
 #define EPFNOSUPPORT            WSAEPFNOSUPPORT
 #define EAFNOSUPPORT            WSAEAFNOSUPPORT
 #define EADDRINUSE              WSAEADDRINUSE
 #define EADDRNOTAVAIL           WSAEADDRNOTAVAIL
 #define ENETDOWN                WSAENETDOWN
 #define ENETUNREACH             WSAENETUNREACH
 #define ENETRESET               WSAENETRESET
 #define ECONNABORTED            WSAECONNABORTED
 #define ECONNRESET              WSAECONNRESET
解决方法：
注释掉
// #if 0
//#endif
在system_error中 添加<WinSock2.h>
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