如何产生ioexception_生活中需要配合的例子

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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();
}

DWORD WINAPI ServerThread(LPVOID lpParam)
{

    HANDLE CompletionPort = (HANDLE)lpParam;
    DWORD bytes;
    LPPER_HANDLE_DATA perHandleData = NULL;    //单句柄数据
    LPPER_IO_DATA perIoData;            //单IO数据
    DWORD Flags;
    int ret;
    DWORD RecvBytes;
    //进入循环的等待重叠操作的完成
    while(true)
    {

        bytes = -1;
        ret=GetQueuedCompletionStatus(
            CompletionPort,                //原先的完成端口句柄
            &bytes,                        //重叠操作完成的字节数
            (LPDWORD)&perHandleData,    //原先和完成端口句柄关联起来的单句柄数据
            (LPOVERLAPPED*)&perIoData,    //用于接收已完成的IO操作的重叠结构
            INFINITE);                    //在完成端口上等待的时间 INFINITE 为无限等待
       
        //先检查在套接字上是否发生错误
        //当发生错误时关闭套接字同时释放掉所有的内存.
        int i = 0;
        if(bytes == 0 && (perIoData->operatorType == RECV ||
            perIoData->operatorType == SEND))
        {

            closesocket(perHandleData->socket);
            GlobalFree(perHandleData);
            GlobalFree(perIoData);
            cout<<“closesocket and globalfree perhandledata periodata!”<<endl;
            continue;
        }
        //这是AcceptEx函数处理完成，在下面处理
        if(perIoData->operatorType == ACCEPT)    //处理连接操作
        {

            //使用GetAcceptExSockaddrs函数 获得具体的各个地址参数.
            if(setsockopt( perIoData->client, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT, 
                ( char* )&(perHandleData->socket ), sizeof( perHandleData->socket ) )==SOCKET_ERROR)
                cout<<“setsockopt…”<<endl;

            perHandleData->socket = perIoData->client;

            //memcpy(&(perHandleData->clientAddr),raddr,sizeof(raddr));
            //将新的客户套接字与完成端口连接
            CreateIoCompletionPort((HANDLE)perHandleData->socket,
                CompletionPort,(ULONG_PTR)perHandleData,0);

            memset(&(perIoData->overlapped),0,sizeof(OVERLAPPED));
            perIoData->operatorType = RECV;        //将状态设置成接收
            //设置WSABUF结构
            perIoData->buffer.buf = perIoData->dataBuffer;
            perIoData->buffer.len = perIoData->dataLength = DATA_LENGTH;

            cout<<“wait for data arrive(Accept)…”<<endl;
            Flags = 0;
            if(WSARecv(perHandleData->socket,&(perIoData->buffer),1,
                &RecvBytes,&Flags,&(perIoData->overlapped),NULL)==SOCKET_ERROR)
                if(WSAGetLastError()==WSA_IO_PENDING)
                    cout<<“WSARecv Pending…”<<endl;
            continue;           
        }
        if(perIoData->operatorType == RECV)
            cout<<perIoData->buffer.buf<<endl;    //将接收到的数据显示出来
        Flags = 0;
        perIoData->operatorType = RECV;            //设置成接受数据类型

        ZeroMemory(&(perIoData->overlapped),sizeof(OVERLAPPED));
        //重新投递一个新的接收请求
        cout<<” wait for data arrive…”<<endl;
        WSARecv(perHandleData->socket,&(perIoData->buffer),1,
            &RecvBytes,&Flags,&(perIoData->overlapped),NULL);
    }

    return 0;
}

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/kener_linfeng/archive/2009/05/03/4145471.aspx