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            今天編譯工程的時(shí)候遇到了這個(gè)問題,網(wǎng)上搜了下,掃噶,備忘一下
            問題描述:在 VC 6.0中使用socket相關(guān)的函數(shù)時(shí)沒有什么問題,可是到了.net下就有以下類似的錯(cuò)誤,
            [C++ Error] winsock2.h(109): E2238 Multiple declaration for 'fd_set'
            [C++ Error] winsock.h(54): E2344 Earlier declaration of 'fd_set'
            [C++ Error] winsock2.h(112): E2146 Need an identifier to declare
            [C++ Warning] winsock2.h(144): W8017 Redefinition of 'FD_SET' is not identical
            [C++ Error] winsock2.h(153): E2238 Multiple declaration for 'timeval'
            [C++ Error] winsock.h(97): E2344 Earlier declaration of 'timeval'
            [C++ Error] winsock2.h(209): E2238 Multiple declaration for 'hostent'
            [C++ Error] winsock.h(153): E2344 Earlier declaration of 'hostent'
            [C++ Error] winsock2.h(222): E2238 Multiple declaration for 'netent'
            [C++ Error] winsock.h(166): E2344 Earlier declaration of 'netent'
            [C++ Error] winsock2.h(229): E2238 Multiple declaration for 'servent'
            [C++ Error] winsock.h(173): E2344 Earlier declaration of 'servent'
            [C++ Error] winsock2.h(241): E2238 Multiple declaration for 'protoent'
            [C++ Error] winsock.h(185): E2344 Earlier declaration of 'protoent'
            [C++ Error] winsock2.h(327): E2238 Multiple declaration for 'in_addr'
            [C++ Error] winsock.h(269): E2344 Earlier declaration of 'in_addr'
            [C++ Error] winsock2.h(385): E2238 Multiple declaration for 'sockaddr_in'
            [C++ Error] winsock.h(319): E2344 Earlier declaration of 'sockaddr_in'
            [C++ Error] winsock2.h(395): E2238 Multiple declaration for 'WSAData'
            [C++ Error] winsock.h(329): E2344 Earlier declaration of 'WSAData'
            [C++ Error] winsock2.h(411): E2146 Need an identifier to declare
            [C++ Warning] winsock2.h(455): W8017 Redefinition of 'SO_DONTLINGER' is not identical
            [C++ Warning] winsock2.h(512): W8017 Redefinition of 'AF_IPX' is not identical
            [C++ Warning] winsock2.h(540): W8017 Redefinition of 'AF_MAX' is not identical
            [C++ Error] winsock2.h(546): E2238 Multiple declaration for 'sockaddr'
            [C++ Error] winsock.h(492): E2344 Earlier declaration of 'sockaddr'
            [C++ Error] winsock2.h(586): E2238 Multiple declaration for 'sockproto'
            [C++ Error] winsock.h(501): E2344 Earlier declaration of 'sockproto'
            [C++ Error] winsock2.h(625): E2238 Multiple declaration for 'linger'
            [C++ Error] winsock2.h(625): E2228 Too many error or warning messages

            Solution:

            This problem arises because windows.h (at least, that version of it) includes not winsock2.h but winsock.h; sadly when Microsoft wrote winsock2.h they chose neither to change windows.h to include winsock2.h, which replaces winsock.h, nor to include windows.h from winsock2.h and then add the definitions for the new Winsock 2 API methods & structures (this might seem reasonable since Winsock 2 does, strictly speaking, replace Winsock 1, but since the API must be fully backwards-compatible the distinction is somewhat meaningless and there's no real benefit to making winsock2.h standalone).

            The fix is thankfully simple: always "#include <winsock2.h>" before windows.h.

            However, you must remember that if windows.h has been included by (for example) a higher-level header file that is subsequently including your header file, it's too late - so you must make sure that the higher-level header files respect this convention also.

            It is however rarely necessary to modify the header files of libraries or other code modules you are using just because you include their header files, and their header files include windows.h - you can just include winsock2.h before you include the library's header files.


            在包含jrtplib有時(shí)候我也遇到這個(gè)問題,解決方法與之相同。一句話,在#include<windows.h>之前 #include <winsock2.h> 問題就可以解決。

            問題描述]
               在包含了<windows.h>以及<winsock2.h>的工程中,編譯有時(shí)會(huì)出現(xiàn)如
            下錯(cuò)誤:

                 error C2011: 'fd_set' : 'struct' type redefinition
                 error C2011: 'timeval' : 'struct' type redefinition
                                 ....
                 error C2375: 'accept' : redefinition; different linkage
            [原因分析]
               主要原因是因?yàn)?lt;windows.h>中包含了<winsock.h>頭文件,由于其版
            本的不同,導(dǎo)致出
            現(xiàn)上述的錯(cuò)誤。<windows.h>中相關(guān)代碼如下:
                           #ifndef WIN32_LEAN_AND_MEAN
                           #include <cderr.h>
                           #include <dde.h>
                           #include <ddeml.h>
                           ........
                            #ifndef _MAC
                           #include <winperf.h>
                           #include <winsock.h>
                           #endif
                            .......

                           #include <commdlg.h>
                           #endif
                           #endif
            [解決方案]
                由以上代碼可以看出如果在沒有定義WIN32_LEAN_AND_MEAN宏
            的大前
            提下windows.h有可能包含winsock.h 頭文件,因此我們得出一個(gè)很簡單
            的解決方
            法就是在包含<windows.h>之前定義WIN32_LEAN_AND_MEAN宏,如
            下所示:
            #define WIN32_LEAN_AND_MEAN
            #include <windows.h>

             原文地址 http://blog.sina.com.cn/s/blog_4906d564010094p8.html
            posted on 2010-10-23 14:01 風(fēng)輕云淡 閱讀(984) 評論(0)  編輯 收藏 引用 所屬分類: C++
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