AcceptEx参数

`AcceptEx`是一个在Windows API中用于网络通信（如TCP/IP）的函数，它主要用于接收多个套接字的数据包，并将它们合并成一块数据发送给应用程序。这个函数通常用于提高性能，特别是在处理多个连接请求时，它可以一次从套接字读取多个数据块。

`AcceptEx`的基本用法涉及以下几个参数：

1. `lpOutputBuffer`：指向预分配缓冲区的指针，用来存放接受到的数据。
2. `lpOutputBufferLength`：缓冲区的大小，传入之前应先设置好。
3. `lpInputBuffer`：如果需要，可以提供输入缓冲区，用于返回发往其他连接的数据。
4. `lpInputBufferLength`：输入缓冲区的大小。
5. `dwFlags`：标志位，包括FIN_PEEK（检查FIN标志）等，用于控制功能选项。
6. ` overlapped`：指向`OVERLAPPED`结构的指针，用于异步I/O操作的完成通知。
7. `hEvent`：事件句柄，关联于`overlapped`结构，表示异步操作完成。

相关问题

iocp服务器代码_tct&udp下载

IOCP（Input/Output Completion Ports）是一种Windows系统下的高性能网络编程方式，通过异步I/O模型和多线程技术来提升服务器的吞吐量和性能。下面是一个简单的IOCP服务器代码示例：

#include <iostream>
#include <Winsock2.h>
#include <Windows.h>

#pragma comment(lib, "ws2_32.lib")

#define MAX_BUFFER_SIZE 4096
#define SERVER_PORT 8080

struct ClientContext {
    OVERLAPPED overlapped;
    SOCKET socket;
    CHAR buffer[MAX_BUFFER_SIZE];
    WSABUF wsaBuf;
};

DWORD WINAPI ServerWorkerThread(LPVOID lpParam) {
    HANDLE iocp = (HANDLE)lpParam;
    DWORD numBytes = 0;
    ULONG_PTR completionKey = 0;
    LPOVERLAPPED overlapped = NULL;
    ClientContext* clientContext = NULL;

    while (TRUE) {
        if (!GetQueuedCompletionStatus(iocp, &numBytes, &completionKey, &overlapped, INFINITE)) {
            std::cout << "IOCP Error: " << GetLastError() << std::endl;
            continue;
        }

        clientContext = CONTAINING_RECORD(overlapped, ClientContext, overlapped);
        if (numBytes == 0) {
            closesocket(clientContext->socket);
            delete clientContext;
            continue;
        }

        std::cout << "Received data: " << clientContext->buffer << std::endl;

        // Process client request

        // Send response to client

        // Prepare for next I/O operation
        ZeroMemory(&(clientContext->overlapped), sizeof(OVERLAPPED));
        clientContext->wsaBuf.buf = clientContext->buffer;
        clientContext->wsaBuf.len = MAX_BUFFER_SIZE;

        DWORD flags = 0;
        DWORD recvBytes = 0;
        int ret = WSARecv(clientContext->socket, &(clientContext->wsaBuf), 1, &recvBytes, &flags, &(clientContext->overlapped), NULL);
        if (ret == SOCKET_ERROR && WSAGetLastError() != WSA_IO_PENDING) {
            std::cout << "WSARecv Error: " << WSAGetLastError() << std::endl;
            closesocket(clientContext->socket);
            delete clientContext;
        }
    }

    return 0;
}

int main() {
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cout << "Failed to initialize Winsock" << std::endl;
        return -1;
    }

    // Create socket
    SOCKET listenSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (listenSocket == INVALID_SOCKET) {
        std::cout << "Failed to create socket" << std::endl;
        return -1;
    }

    // Bind socket
    SOCKADDR_IN serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(SERVER_PORT);
    serverAddr.sin_addr.S_un.S_addr = INADDR_ANY;
    if (bind(listenSocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
        std::cout << "Failed to bind socket" << std::endl;
        return -1;
    }

    // Listen
    if (listen(listenSocket, SOMAXCONN) == SOCKET_ERROR) {
        std::cout << "Failed to listen" << std::endl;
        return -1;
    }

    // Create IOCP
    HANDLE iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
    if (iocp == NULL) {
        std::cout << "Failed to create IOCP" << std::endl;
        return -1;
    }

    SYSTEM_INFO systemInfo;
    GetSystemInfo(&systemInfo);
    int numThreads = systemInfo.dwNumberOfProcessors * 2;
    for (int i = 0; i < numThreads; i++) {
        HANDLE threadHandle = CreateThread(NULL, 0, ServerWorkerThread, iocp, 0, NULL);
        CloseHandle(threadHandle);
    }

    // Associate listen socket with IOCP
    CreateIoCompletionPort((HANDLE)listenSocket, iocp, 0, 0);

    while (TRUE) {
        // Accept incoming client connections
        SOCKADDR_IN clientAddr;
        int addrLen = sizeof(clientAddr);
        SOCKET clientSocket = accept(listenSocket, (SOCKADDR*)&clientAddr, &addrLen);
        if (clientSocket == INVALID_SOCKET) {
            std::cout << "Failed to accept client connection" << std::endl;
            continue;
        }

        // Register client socket with IOCP
        ClientContext* clientContext = new ClientContext();
        clientContext->socket = clientSocket;
        ZeroMemory(&(clientContext->overlapped), sizeof(OVERLAPPED));
        clientContext->wsaBuf.buf = clientContext->buffer;
        clientContext->wsaBuf.len = MAX_BUFFER_SIZE;

        DWORD flags = 0;
        DWORD recvBytes = 0;
        int ret = WSARecv(clientSocket, &(clientContext->wsaBuf), 1, &recvBytes, &flags, &(clientContext->overlapped), NULL);
        if (ret == SOCKET_ERROR && WSAGetLastError() != WSA_IO_PENDING) {
            std::cout << "WSARecv Error: " << WSAGetLastError() << std::endl;
            closesocket(clientSocket);
            delete clientContext;
            continue;
        }
    }

    closesocket(listenSocket);
    WSACleanup();

    return 0;
}

以上是一个简单的IOCP服务器代码示例，通过IOCP模型和多线程技术实现异步高性能的网络通信。服务器在循环中等待客户端连接请求，并通过AcceptEx函数接受客户端连接，并将相关的客户端Socket与IOCP关联。每个线程通过WaitForMultipleObjects函数等待来自客户端的I/O完成事件，并进行相应的处理。对于已连接的客户端，通过WSARecv函数接收客户端发送的数据，并根据具体业务逻辑进行处理，然后通过WSASend函数发送响应给客户端，最后继续等待下一个I/O操作的完成。这样的方式可以充分利用系统资源，提高服务器的并发性能和吞吐量。