WSAAsyncSelect()函数有什么功能?一般哪种情况下使有?兄弟英文不太灵,MSDN没看太明白.

Question

刚才我好象回答过一次了？！
调用WSAAsyncSelect函数你可以指定系统给你发送什么消息!!!

Answer 1

请大哥看下面的程序片段:
if(::WSAAsyncSelect(m_sListen, m_hWnd, WM_SOCKET_CONNECT,FD_ACCEPT)==SOCKET_ERROR)
{
m_Err_Message.Format("无法启动IO模块;\n错误码：%d",WSAGetLastError());
::MessageBox(m_hWnd,m_Err_Message,"系统错误",MB_OK|MB_ICONSTOP);
return FALSE;
}
listen(m_sListen,10);在此片段中,WSAAsyncSelect()与listen()各起什么作用?

Answer 2

其中自定义消息WM_SOCKET_CONNECT的响应函数为:
void CSendView::OnConnect(WPARAM wparam, LPARAM lparam)
{
pFrame->m_wndStatusBar.SetPaneText(1,_T("客户机正在连接我端服务器..."));
//响应客户连接
SOCKET sServer=(SOCKET)wparam;
int nErrorCode = HIWORD(lparam);
int nMessage = LOWORD(lparam);
int nLength = sizeof(SOCKADDR_IN);
SOCKADDR_IN Client_Addr;
int nIndex;
CString m_Err_Message;
CConnect *pClient=new CConnect;
//保存客户机连接信息
nIndex=m_Connect.Add(pClient);
pClient->m_Connect=accept(sServer,(LPSOCKADDR)&Client_Addr,&nLength);
if(pClient->m_Connect==INVALID_SOCKET)
{
m_Err_Message.Format("错误：无法接受客户机连接SOCKET!,\n错误码：",WSAGetLastError());
AfxMessageBox(m_Err_Message);
m_Connect.RemoveAt(nIndex);
return ;
}
pClient->m_Address=inet_ntoa(Client_Addr.sin_addr);
//进行消息队列循环
::WSAAsyncSelect(pClient->m_Connect,m_hWnd,WM_SOCKET_READ,FD_READ|FD_CLOSE);
//创建连接客户端的子线程
pClient->m_Client=new CClientThread(GetSafeHwnd(),pClient->m_Connect,pClient->m_Address);
if( pClient->m_Client== NULL )
{
::MessageBox(GetSafeHwnd(),"无法创建连接子线程", "错误", MB_OK|MB_ICONSTOP );
return ;
}
pClient->m_Client->CreateThread();
pFrame->m_wndStatusBar.SetPaneText(1,_T("连接完毕..."));
if(!App.Gl_Begin)
pClient->m_Client->PostThreadMessage(WM_SOCKET_SEND_DATA,(WPARAM)ReturnMessage(),0L);
}