subject_21216.htm

一些关于vc的问答

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序号：21216 发表者：bborn 发表日期：2002-11-14 21:35:51
<br>主题：winsock编程 初始化的问题函数WSAstartup的问题
<br>内容：int WSAStartup(WORD wVersionRequested,LPWSADATA lpWSAData)<BR><BR>这两个参数是什么作用 怎么用的？<BR><BR>第一个说是winsock的版本 用makeword宏取到<BR><BR>怎么用的 ？ 哪个字节是主版本？
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<font color=red>答案被接受</font><br>回复者：CDMA2000 回复日期：2002-11-15 09:18:35
<br>内容：wVersionRequested 中<BR>高字节为次版本，低字节为主版本！<BR><BR>WORD wVersionRequested;<BR>WSADATA wsaData;<BR>int err;<BR><BR>wVersionRequested = MAKEWORD( 2, 2 );<BR> <BR>err = WSAStartup( wVersionRequested, &amp;wsaData );<BR>if ( err != 0 ) {<BR>&nbsp;&nbsp;&nbsp;&nbsp;/* Tell the user that we could not find a usable */<BR>&nbsp;&nbsp;&nbsp;&nbsp;/* WinSock DLL.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/<BR>&nbsp;&nbsp;&nbsp;&nbsp;return;<BR>}<BR> <BR>/* Confirm that the WinSock DLL supports 2.2.*/<BR>/* Note that if the DLL supports versions greater&nbsp;&nbsp;&nbsp;&nbsp;*/<BR>/* than 2.2 in addition to 2.2, it will still return */<BR>/* 2.2 in wVersion since that is the version we&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/<BR>/* requested.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/<BR> <BR>if ( LOBYTE( wsaData.wVersion ) != 2 ||<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HIBYTE( wsaData.wVersion ) != 2 ) {<BR>&nbsp;&nbsp;&nbsp;&nbsp;/* Tell the user that we could not find a usable */<BR>&nbsp;&nbsp;&nbsp;&nbsp;/* WinSock DLL.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/<BR>&nbsp;&nbsp;&nbsp;&nbsp;WSACleanup( );<BR>&nbsp;&nbsp;&nbsp;&nbsp;return; <BR>}<BR> 
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回复者：bborn 回复日期：2002-11-15 17:03:00
<br>内容：能不能讲讲这个初始化是怎么用?？？<BR>makeword 宏是怎么用的 ？<BR>WSAStartup的参数是什么用的？<BR><BR>wsaData 什么作用<BR>为什么只定义了 就能用？ 并没有给它什么参数啊？<BR>
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回复者：bborn 回复日期：2002-11-16 09:59:22
<br>内容：up 没有人回答吗?<BR><BR>makeword 宏是怎么用的 ？<BR>WSAStartup的参数是什么用的？<BR><BR>wsaData 什么作用<BR>为什么只定义了 就能用？ 并没有给它什么参数啊？<BR><BR>
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回复者：bborn 回复日期：2002-11-17 13:54:18
<br>内容：up
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