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作者：chang290 发表时间：2005-12-17 16:38:00

这是在学《Windows网络编程（第二版）》第六章时制作的一个例子,由于书中没有给出简洁的例子，本人在学这里时就费了很多时间。现在把完成的代码贴出来，供大家参考。
下面包括了主程序部分，工作线程在（2）中贴出，由于代码太长。
本程序在VS2003编译器编译运行。在6.0下可能需要稍加修改。

#include <iostream>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <mswsock.h> //微软扩展的类库

using namespace std;
#define SEND 0
#define RECV 1
#define ACCEPT 2

#define DATA_LENGTH 1000
//单句柄数据定义
typedef struct _PER_HANDLE_DATA
{
SOCKET socket; //相关的套接字
SOCKADDR_STORAGE clientAddr; //客户端的地址
}PER_HANDLE_DATA,*LPPER_HANDLE_DATA;

//但IO操作数据
typedef struct{
OVERLAPPED overlapped;
WSABUF buffer; //一个数据缓冲区,用于WSASend/WSARecv中的第二个参数
char dataBuffer[DATA_LENGTH]; //实际的数据缓冲区
int dataLength; //实际的数据缓冲区长度
int operatorType; //操作类型,可以为SEND/RECV两种
SOCKET client; //分别表示发送的字节数和接收的字节数
}PER_IO_DATA,*LPPER_IO_DATA;

void main()
{
HANDLE CompletionPort;
WSADATA data;
SYSTEM_INFO info;
SOCKADDR_IN addr;
SOCKET Listen;

unsigned int i;
WSAStartup(MAKEWORD(2,2),&data);

//创建一个IO完成端口
CompletionPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE,NULL,0,0);
//确定处理器的数量
GetSystemInfo(&info); //创建线城
for(i=0;i<info.dwNumberOfProcessors * 2;i++)
{
//根据处理器的数量创建相应多的处理线程
HANDLE thread = CreateThread(NULL,0,ServerThread,CompletionPort,0,NULL);
CloseHandle(thread);
}
//创建一个监听套接字(进行重叠操作)
Listen = WSASocket(AF_INET,SOCK_STREAM,0,NULL,0,WSA_FLAG_OVERLAPPED);
//将监听套接字与完成端口绑定
LPPER_HANDLE_DATA perDandleData;
perDandleData = (LPPER_HANDLE_DATA)GlobalAlloc(GPTR,sizeof(PER_HANDLE_DATA));
perDandleData->socket = Listen;
CreateIoCompletionPort((HANDLE)Listen,CompletionPort,(ULONG_PTR)perDandleData,0);

addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(5500);

bind(Listen,(PSOCKADDR)&addr,sizeof(addr));
listen(Listen,5);

LPFN_ACCEPTEX lpfnAcceptEx = NULL; //AcceptEx函数指针
//Accept function GUID
GUID guidAcceptEx = WSAID_ACCEPTEX;
//get acceptex function pointer
DWORD dwBytes = 0;
if(WSAIoctl(Listen,SIO_GET_EXTENSION_FUNCTION_POINTER,
&guidAcceptEx,sizeof(guidAcceptEx),&lpfnAcceptEx,sizeof(lpfnAcceptEx),
&dwBytes,NULL,NULL)==0)
cout<<"WSAIoctl success..."<<endl;
else{
cout<<"WSAIoctl failed..."<<endl;
switch(WSAGetLastError())
{
case WSAENETDOWN:
cout<<""<<endl;
break;
case WSAEFAULT:
cout<<"WSAEFAULT"<<endl;
break;
case WSAEINVAL:
cout<<"WSAEINVAL"<<endl;
break;
case WSAEINPROGRESS:
cout<<"WSAEINPROGRESS"<<endl;
break;
case WSAENOTSOCK:
cout<<"WSAENOTSOCK"<<endl;
break;
case WSAEOPNOTSUPP:
cout<<"WSAEOPNOTSUPP"<<endl;
break;
case WSA_IO_PENDING:
cout<<"WSA_IO_PENDING"<<endl;
break;
case WSAEWOULDBLOCK:
cout<<"WSAEWOULDBLOCK"<<endl;
break;
case WSAENOPROTOOPT:
cout<<"WSAENOPROTOOPT"<<endl;
break;
}
return;
}

//while(true)
//{
//准备调用 AcceptEx 函数，该函数使用重叠结构并于完成端口连接
LPPER_IO_DATA perIoData = (LPPER_IO_DATA)GlobalAlloc(GPTR,sizeof(PER_IO_DATA));
memset(&(perIoData->overlapped),0,sizeof(OVERLAPPED));
perIoData->operatorType = ACCEPT;
//在使用AcceptEx前需要事先重建一个套接字用于其第二个参数。这样目的是节省时间
//通常可以创建一个套接字库
perIoData->client = WSASocket(AF_INET,SOCK_STREAM,IPPROTO_TCP,0,0,WSA_FLAG_OVERLAPPED);

perIoData->dataLength = DATA_LENGTH;
DWORD flags = 0;

//调用AcceptEx函数，地址长度需要在原有的上面加上16个字节
//注意这里使用了重叠模型，该函数的完成将在与完成端口关联的工作线程中处理
cout<<"Process AcceptEx function wait for client connect..."<<endl;
int rc = lpfnAcceptEx(Listen,perIoData->client,perIoData->dataBuffer,
perIoData->dataLength-((sizeof(SOCKADDR_IN)+16)*2),
sizeof(SOCKADDR_IN)+16,sizeof(SOCKADDR_IN)+16,&dwBytes,
&(perIoData->overlapped));
if(rc == FALSE)
{
if(WSAGetLastError()!=ERROR_IO_PENDING)
cout<<"lpfnAcceptEx failed.."<<endl;
}

cin>>i;
closesocket(Listen);
WSACleanup();
}