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     A project used ADO method making connection to mysql may not work so well and may not so effictive ,  thus , use Mysql C-Api is a rather good scheme , but the C-Api  is rather tougn for beginner , fortunately , An project called Mysql++ lib avaliable for C++ programmer. It's better than C-Api , but there is a problem while using with winsock2 on the platform Ms-windows .
Any question , contact me as follows:

天津大学计算机学院 常兴龙

    The problem may appear like this :

c:\program files\devstudio\vc98\include\winsock2.h(99) : error C2011: 'fd_set' : 'struct' type redefinition
c:\program files\devstudio\vc98\include\winsock2.h(134) : warning C4005: 'FD_SET' : macro redefinition
c:\program files\devstudio\vc98\include\winsock.h(83) : see previous definition of 'FD_SET'
c:\program files\devstudio\vc98\include\winsock2.h(143) : error C2011: 'timeval' : 'struct' type redefinition
c:\program files\devstudio\vc98\include\winsock2.h(199) : error C2011: 'hostent' : 'struct' type redefinition
c:\program files\devstudio\vc98\include\winsock2.h(212) : error C2011: 'netent' : 'struct' type redefinition
c:\program files\devstudio\vc98\include\winsock2.h(219) : error C2011: 'servent' : 'struct' type redefinition 

The problem tells its own table , the winsock.h was included somewhere . As we know , using the winsock and winsock2 must notice these :


 Winsock2.h must be inclued before winsock.h

if you use windows.h , you must use like this :

   #define WIN32_LEAN_AND_MEAN
   #include <windows.h>

but , this time , the winsock.h inclued in the diretory /Mysql++ 2.2.3 /lib/Common.h ,What could I do to enable Winsock2 in my project and make no impress on other projects?

this is a unified way to make the things easier and clear - Condition Compiler , you can code like this :

#ifdef _CXL_WINSOCK2
 #include <winsock2.h>
 #pragma message("###The compiler's behavior Changed by Chang xinglong to Enable winsock2 in Mysql++...###")
 #include <winsock.h>

after done , you define _CXL_WINSOCK2  in your project to enable winsock2  or leave it to use winsock.

posted on 2007-06-07 16:58 常兴龙 阅读(838) 评论(2)  编辑 收藏 引用


# re: Something problem resovled [Winsock2&mysql++-2.2.3 Sdk compatible problem] 2007-06-14 21:18 hinobou
为啥要用英文写啊,看着怪累的^^  回复  更多评论

# re: Something problem resovled [Winsock2&mysql++-2.2.3 Sdk compatible problem] 2007-06-14 21:55 天津大学计算机学院 常兴龙
呵呵。。。。中文打字慢。。。你的Blog不错哦。  回复  更多评论

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