var Msg: TMessage);
var
sock : TSocket;
addr : TSockAddrIn;
addrlen : Integer;
buf : Array [0..4095] of Char;
begin //Msg的WParam是产生了网络事件的socket句柄,LParam则包含了事件类型
case WSAGetSelectEvent( Msg.LParam ) of
FD_ACCEPT : begin
addrlen := sizeof(addr);
sock := accept( Msg.WParam, addr, addrlen );
if sock <> INVALID_SOCKET then
WSAAsyncSelect( sock, Handle, WM_SOCKET, FD_READ or FD_WRITE or FD_CLOSE );
end;
FD_CLOSE : closesocket( Msg.WParam );
FD_READ : recv( Msg.WParam, buf[0], 4096, 0 );
FD_WRITE : ;
end;
end;
三:WSAEventSelect模型
后来,微软的信箱非常畅销,购买微软信箱的人以百万计数......以至于盖茨每天24小时给客户打电话,累得腰酸背痛,喝蚁力神都不好使。微软改进了他们的信箱:在客户的家中添加一个附加装置,这个装置会监视客户的信箱,每当新的信件来临,此装置会发出"新信件到达"声,提醒老陈去收信。盖茨终于可以睡觉了。
同样要使用线程:
procedure TListenThread.Execute;
var
hEvent : WSAEvent;
ret : Integer;
ne : TWSANetworkEvents;
sock : TSocket;
adr : TSockAddrIn;
sMsg : String;
Index, EventTotal : D
word;
EventArray : Array [0..WSA_MAXIMUM_WAIT_EVENTS-1] of WSAEVENT;
begin
...socket
...bind
... hEvent := WSACreateEvent();
WSAEventSelect( ListenSock, hEvent, FD_ACCEPT or FD_CLOSE );
...listen...
while ( not Terminated ) do
begin
Index := WSAWaitForMultipleEvents( EventTotal, @EventArray[0], FALSE, WSA_INFINITE, FALSE );
FillChar( ne, sizeof(ne), 0 );
WSAEnumNetworkEvents( SockArray[Index-WSA_WAIT_EVENT_0], Event