分享我写的IOCP：源码+思路

void MyIOCP::Execute() 
{ 
    PerHandleData* pPerHandleData = nullptr; 
    PerIOData* pPerIOData = nullptr; 
    LPOVERLAPPED lpOverLapped = nullptr; 
    DWORD byteTransferred; 
    BOOL bRet = FALSE;

    while (true) 
    { 
        bRet = GetQueuedCompletionStatus(mCompletionPort, 
            &byteTransferred, 
            (PULONG_PTR)&pPerHandleData, 
            /*(LPOVERLAPPED*)&pPerIOData*/&lpOverLapped, 
            INFINITE); 
        pPerIOData = (PerIOData*)CONTAINING_RECORD(lpOverLapped, PerIOData, overlapped); 
        if (bRet == FALSE) 
        { 
            if (pPerIOData == nullptr) 
            { 
                // 退出线程。服务器要关了。。 
                break; 
            } 
            // 对方主动断开了

            continue; 
        }

        // 处理成功的完成端口请求 
        switch (pPerIOData->operationType) 
        { 
        case CDH::E_INVALID: 
            { 
            } 
            break; 
        case CDH::E_ACCEPT: 
            { 
                /************************************************************************/ 
                /* 
                inet_ntoa(ClientAddr->sin_addr) 是客户端IP地址

                ntohs(ClientAddr->sin_port) 是客户端连入的端口

                inet_ntoa(LocalAddr ->sin_addr) 是本地IP地址

                ntohs(LocalAddr -AZ>sin_port) 是本地通讯的端口

                pIoContext->m_wsaBuf.buf 是存储客户端发来第一组数据的缓冲区 
                */ 
                /************************************************************************/ 
                SOCKADDR_IN* ClientAddr = NULL; 
                SOCKADDR_IN* LocalAddr = NULL; 
                int remoteLen = sizeof(SOCKADDR_IN), localLen = sizeof(SOCKADDR_IN); 
                mlpfnGetAcceptExSockAddrs(pPerIOData->buffer, 0,  sizeof(SOCKADDR_IN)+16, sizeof(SOCKADDR_IN)+16, (LPSOCKADDR*)&LocalAddr, &localLen, (LPSOCKADDR*)&ClientAddr, &remoteLen);

                WrapSocket* connectedSocket = GetSocketAndEraseFromTheMap(pPerIOData->remoteSocket, WRAPESOCKETTYPE::E_READYTOBECONNECTED); 
                if (connectedSocket == nullptr) 
                { 
                    closesocket(pPerIOData->remoteSocket); 
                    continue; 
                } 
                if (!AssociateDeviceWithCompletionPort(connectedSocket)) 
                { 
                    closesocket(pPerIOData->remoteSocket); 
                    continue; 
                } 
                // 添加到已经连接列表 
                InsertWrapSocketToMap(connectedSocket, WRAPESOCKETTYPE::E_CONNECTED);

                PostReceive(connectedSocket);

                // 这次消耗了一个准备好了的socket, 现在再生成一个socket待连接。 
                PostAcceptEx(connectedSocket->GetPerHandleData().hasListenSocket); 
            } 
            break; 
        case CDH::E_RECV: 
            { 
                int socket = pPerHandleData->selfSocket; 
                WrapSocket* wrapSocket = nullptr; 
                GetSocketForSendOrRecvData(socket, wrapSocket);

                if (wrapSocket != nullptr) 
                { 
                    wrapSocket->GetPerIODataReceive().bufferLen = byteTransferred; 
                    Receive(wrapSocket); 
                } 
            } 
            break; 
        case CDH::E_SEND: 
            { 
                int socket = pPerHandleData->selfSocket; 
                WrapSocket* wrapSocket = nullptr; 
                GetSocketForSendOrRecvData(socket, wrapSocket); 
                if (wrapSocket != nullptr) 
                { 
                    wrapSocket->SendingData(false); 
                }

            } 
            break; 
        case CDH::E_CONNECT: 
            break; 
        default: 
            break; 
        }

    } 
}