如何产生ioexception_结合实例论述控制过程

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在普通IOCP的基础上注意两点：
1.记得把监听socket绑定到端口
2.在Accept处理过程中，抛出接受连接的AcceptEx请求,绑定客户端socket到端口和抛出recv请求

客户端要断开连接时，只需发送一个大小为0的内容即可。我们在服务器处理时，收到0，就销毁该socket

// IOCP_TCPIP_Socket_Server.cpp

#include <WinSock2.h>
#include <Windows.h>
#include <vector>
#include <iostream>
#include <mswsock.h>

using namespace std;

#pragma comment(lib, "Ws2_32.lib") // Socket编程需用的动态链接库
#pragma comment(lib, "Kernel32.lib") // IOCP需要用到的动态链接库


#define SEND 0
#define RECV 1
#define ACCEPT 2


/** * 结构体名称：PER_IO_DATA * 结构体功能：重叠I/O需要用到的结构体，临时记录IO数据 **/
const int DataBuffSize = 2 * 1024;
typedef struct
{
    OVERLAPPED overlapped;
    WSABUF databuff;
    char buffer[DataBuffSize];
    int BufferLen;
    int operationType;
    SOCKET client;
}PER_IO_OPERATEION_DATA, *LPPER_IO_OPERATION_DATA, *LPPER_IO_DATA, PER_IO_DATA;

/** * 结构体名称：PER_HANDLE_DATA * 结构体存储：记录单个套接字的数据，包括了套接字的变量及套接字的对应的客户端的地址。 * 结构体作用：当服务器连接上客户端时，信息存储到该结构体中，知道客户端的地址以便于回访。 **/
typedef struct
{
    SOCKET socket;
    SOCKADDR_STORAGE ClientAddr;
}PER_HANDLE_DATA, *LPPER_HANDLE_DATA;

// 定义全局变量
const int DefaultPort = 5000;
vector < PER_HANDLE_DATA* > clientGroup;        // 记录客户端的向量组
int g_nThread = 0;//开启线程数量
HANDLE hThread[50];//线程句柄

SOCKET srvSocket = NULL;
DWORD dwBytes = 0;

HANDLE hMutex = CreateMutex(NULL, FALSE, NULL);
DWORD WINAPI ServerWorkThread(LPVOID CompletionPortID);
DWORD WINAPI ServerSendThread(LPVOID IpParam);


LPFN_ACCEPTEX lpfnAcceptEx = NULL;//AcceptEx函数指针
GUID guidAcceptEx = WSAID_ACCEPTEX;
GUID GuidGetAcceptExSockAddrs = WSAID_GETACCEPTEXSOCKADDRS;
LPFN_GETACCEPTEXSOCKADDRS lpfnGetAcceptExSockAddrs = NULL;

// 开始主函数
int main()
{
    // 加载socket动态链接库
    WORD wVersionRequested = MAKEWORD(2, 2); // 请求2.2版本的WinSock库
    WSADATA wsaData;    // 接收Windows Socket的结构信息
    DWORD err = WSAStartup(wVersionRequested, &wsaData);

    if (0 != err) { // 检查套接字库是否申请成功
        cerr << "Request Windows Socket Library Error!\n";
        system("pause");
        return -1;
    }
    if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
  
  // 检查是否申请了所需版本的套接字库
        WSACleanup();
        cerr << "Request Windows Socket Version 2.2 Error!\n";
        system("pause");
        return -1;
    }

    // 创建IOCP的内核对象
    /** * 需要用到的函数的原型： * HANDLE WINAPI CreateIoCompletionPort( * __in HANDLE FileHandle, // 已经打开的文件句柄或者空句柄，一般是客户端的句柄 * __in HANDLE ExistingCompletionPort, // 已经存在的IOCP句柄 * __in ULONG_PTR CompletionKey, // 完成键，包含了指定I/O完成包的指定文件 * __in DWORD NumberOfConcurrentThreads // 真正并发同时执行最大线程数，一般推介是CPU核心数*2 * ); **/
    HANDLE completionPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
    if (NULL == completionPort) {   // 创建IO内核对象失败
        cerr << "CreateIoCompletionPort failed. Error:" << GetLastError() << endl;
        system("pause");
        return -1;
    }

    // 创建IOCP线程--线程里面创建线程池

    // 确定处理器的核心数量
    SYSTEM_INFO mySysInfo;
    GetSystemInfo(&mySysInfo);

    // 基于处理器的核心数量创建线程
    for (DWORD i = 0; i < (mySysInfo.dwNumberOfProcessors * 2); ++i) {
        // 创建服务器工作器线程，并将完成端口传递到该线程
        HANDLE ThreadHandle = CreateThread(NULL, 0, ServerWorkThread, completionPort, 0, NULL);//第一NULL代表默认安全选项，第一个0，代表线程占用资源大小，第二个0，代表线程创建后立即执行
        if (NULL == ThreadHandle) {
            cerr << "Create Thread Handle failed. Error:" << GetLastError() << endl;
            system("pause");
            return -1;
        }
        hThread[i] = ThreadHandle;
        ++g_nThread;
    }

    // 建立流式套接字
    srvSocket = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);


    // Associate SOCKET with IOCP 
    if (NULL == CreateIoCompletionPort((HANDLE)srvSocket, completionPort, NULL, 0))
    {
        cout << "CreateIoCompletionPort failed with error code: " << WSAGetLastError() << endl;
        if (INVALID_SOCKET != srvSocket)
        {
            closesocket(srvSocket);
            srvSocket = INVALID_SOCKET;
        }
        return -1;
    }


    // 绑定SOCKET到本机
    SOCKADDR_IN srvAddr;
    srvAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    srvAddr.sin_family = AF_INET;
    srvAddr.sin_port = htons(DefaultPort);
    int bindResult = bind(srvSocket, (SOCKADDR*)&srvAddr, sizeof(SOCKADDR));
    if (SOCKET_ERROR == bindResult) {
        cerr << "Bind failed. Error:" << GetLastError() << endl;
        system("pause");
        return -1;
    }

    // 将SOCKET设置为监听模式
    int listenResult = listen(srvSocket, 10);
    if (SOCKET_ERROR == listenResult) {
        cerr << "Listen failed. Error: " << GetLastError() << endl;
        system("pause");
        return -1;
    }

    // 开始处理IO数据
    cout << "本服务器已准备就绪，正在等待客户端的接入...\n";

     创建用于发送数据的线程
    //HANDLE sendThread = CreateThread(NULL, 0, ServerSendThread, 0, 0, NULL);//第二个0，代表回掉函数参数为0



    for (int i = 0; i < 10; ++i)
    {

        PER_HANDLE_DATA * PerHandleData = NULL;
        SOCKET acceptSocket = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, 0, WSA_FLAG_OVERLAPPED);
        if (INVALID_SOCKET == acceptSocket)
        {
            cerr << "WSASocket failed with error code: %d/n" << WSAGetLastError() << endl;
            return FALSE;
        }

        // 开始在接受套接字上处理I/O使用重叠I/O机制
        // 在新建的套接字上投递一个或多个异步
        // WSARecv或WSASend请求，这些I/O请求完成后，工作者线程会为I/O请求提供服务 
        // 单I/O操作数据(I/O重叠)
        LPPER_IO_OPERATION_DATA PerIoData = NULL;
        PerIoData = (LPPER_IO_OPERATION_DATA)GlobalAlloc(GPTR, sizeof(PER_IO_OPERATEION_DATA));
        ZeroMemory(&(PerIoData->overlapped), sizeof(OVERLAPPED));
        PerIoData->databuff.len = 1024;
        PerIoData->databuff.buf = PerIoData->buffer;
        PerIoData->operationType = ACCEPT;  // read
        PerIoData->client = acceptSocket;

        if (SOCKET_ERROR == WSAIoctl(srvSocket, SIO_GET_EXTENSION_FUNCTION_POINTER, &guidAcceptEx, sizeof(guidAcceptEx), &lpfnAcceptEx,
            sizeof(lpfnAcceptEx), &dwBytes, NULL, NULL))
        {
            cerr << "WSAIoctl failed with error code: " << WSAGetLastError() << endl;
            if (INVALID_SOCKET != srvSocket)
            {
                closesocket(srvSocket);
                srvSocket = INVALID_SOCKET;
            }
            //goto EXIT_CODE;
            return -1;
        }

        if (SOCKET_ERROR == WSAIoctl(srvSocket, SIO_GET_EXTENSION_FUNCTION_POINTER, &GuidGetAcceptExSockAddrs,
            sizeof(GuidGetAcceptExSockAddrs), &lpfnGetAcceptExSockAddrs, sizeof(lpfnGetAcceptExSockAddrs),
            &dwBytes, NULL, NULL))
        {
            cerr << "WSAIoctl failed with error code: " << WSAGetLastError() << endl;
            if (INVALID_SOCKET != srvSocket)
            {
                closesocket(srvSocket);
                srvSocket = INVALID_SOCKET;
            }
            //goto EXIT_CODE;
            return -1;
        }

        if (FALSE == lpfnAcceptEx(srvSocket, PerIoData->client, PerIoData->databuff.buf, PerIoData->databuff.len - ((sizeof(SOCKADDR_IN) + 16) * 2),
            sizeof(SOCKADDR_IN) + 16, sizeof(SOCKADDR_IN) + 16, &dwBytes, &(PerIoData->overlapped)))
        {
            if (WSA_IO_PENDING != WSAGetLastError())
            {
                cerr << "lpfnAcceptEx failed with error code: " << WSAGetLastError() << endl;

                return FALSE;
            }
        }


    }


    Sleep(1000 * 60 * 60);
    PostQueuedCompletionStatus(completionPort, 0, NULL, NULL);
    WaitForMultipleObjects(g_nThread, hThread, TRUE, INFINITE);

    WSACleanup();
    system("pause");
    return 0;
}

// 开始服务工作线程函数
DWORD WINAPI ServerWorkThread(LPVOID IpParam)
{
    HANDLE CompletionPort = (HANDLE)IpParam;
    DWORD BytesTransferred;
    LPOVERLAPPED IpOverlapped;
    LPPER_HANDLE_DATA PerHandleData = NULL;
    LPPER_IO_DATA PerIoData = NULL;
    DWORD RecvBytes = 0;
    DWORD Flags = 0;
    BOOL bRet = false;

    while (true) {
        bRet = GetQueuedCompletionStatus(CompletionPort, &BytesTransferred, (PULONG_PTR)&PerHandleData, (LPOVERLAPPED*)&IpOverlapped, INFINITE);
        if (bRet == 0) {
            if (WAIT_TIMEOUT == GetLastError())
            {
                continue;
            }
            // Error
            cout << "GetQueuedCompletionStatus failed with error:" << GetLastError() << endl;
            continue;
        }
        PerIoData = (LPPER_IO_DATA)CONTAINING_RECORD(IpOverlapped, PER_IO_DATA, overlapped);
        //这个宏的作用是：根据一个结构体实例中的成员的地址，取到整个结构体实例的地址
        //PER_IO_DATA的成员overlapped的地址为&IpOverlapped，结果就可以获得PER_IO_DATA的地址

        if (NULL == PerIoData)
        {
            // Exit thread 
            break;
        }



        // 检查在套接字上是否有错误发生
        if (0 == BytesTransferred && (PerIoData->operationType == RECV || PerIoData->operationType == SEND))
        {
            closesocket(PerHandleData->socket);
            GlobalFree(PerHandleData);
            GlobalFree(PerIoData);
            continue;
        }

        switch (PerIoData->operationType)
        {
        case ACCEPT:
        {
            SOCKADDR_IN* remote = NULL;
            SOCKADDR_IN* local = NULL;
            int remoteLen = sizeof(SOCKADDR_IN);
            int localLen = sizeof(SOCKADDR_IN);
            lpfnGetAcceptExSockAddrs(PerIoData->databuff.buf, PerIoData->databuff.len - ((sizeof(SOCKADDR_IN) + 16) * 2),
                sizeof(SOCKADDR_IN) + 16, sizeof(SOCKADDR_IN) + 16, (LPSOCKADDR*)&local, &localLen, (LPSOCKADDR*)&remote, &remoteLen);


            //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;
            // 创建用来和套接字关联的单句柄数据信息结构
            PerHandleData = (LPPER_HANDLE_DATA)GlobalAlloc(GPTR, sizeof(PER_HANDLE_DATA));  // 在堆中为这个PerHandleData申请指定大小的内存
            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->operationType = RECV;        //将状态设置成接收
                                                   //设置WSABUF结构
            PerIoData->databuff.buf = PerIoData->buffer;
            PerIoData->databuff.len = PerIoData->BufferLen = 1024;

            cout << "wait for data arrive(Accept)..." << endl;
            Flags = 0;
            if (WSARecv(PerHandleData->socket, &(PerIoData->databuff), 1,
                &RecvBytes, &Flags, &(PerIoData->overlapped), NULL) == SOCKET_ERROR)
                if (WSAGetLastError() == WSA_IO_PENDING)
                    cout << "WSARecv Pending..." << endl;

            continue;
        }
        break;
        case RECV:
            // 开始数据处理，接收来自客户端的数据
            //WaitForSingleObject(hMutex, INFINITE);
            cout << "A Client says: " << PerIoData->databuff.buf << endl;
            //ReleaseMutex(hMutex);

            // 为下一个重叠调用建立单I/O操作数据
            ZeroMemory(&(PerIoData->overlapped), sizeof(OVERLAPPED)); // 清空内存
            PerIoData->databuff.len = 1024;
            PerIoData->databuff.buf = PerIoData->buffer;//buf是个指针，这一过程会清空buffer的内容
            PerIoData->operationType = RECV;    // read
            WSARecv(PerHandleData->socket, &(PerIoData->databuff), 1, &RecvBytes, &Flags, &(PerIoData->overlapped), NULL);

            continue;
            break;
        default:
            break;
        }
    }

    return 0;
}


// 发送信息的线程执行函数
DWORD WINAPI ServerSendThread(LPVOID IpParam)
{
    while (1) {
        if (clientGroup.empty())
        {
            Sleep(5000);
            continue;
        }

        char talk[200];
        cin.get(talk, 200);
        int len;
        for (len = 0; talk[len] != '\0'; ++len) {
            // 找出这个字符组的长度
        }
        talk[len] = '\n';
        talk[++len] = '\0';
        printf("I Say:");
        cout << talk;
        //WaitForSingleObject(hMutex, INFINITE);
        for (unsigned i = 0; i < clientGroup.size(); ++i) {
            send(clientGroup[i]->socket, talk, 200, 0); // 发送信息
        }
        //ReleaseMutex(hMutex);
    }
    return 0;
}