iocp简单例子
首先说明：纯iocp使用的例子看：纯iocp例子（里面的代码可能无法运行，但是下面的代码一定可以运行，可以看看它里面的 PostQueuedCompletionStatus函数 的使用，参考参考然后拿出来放到下面的代码里测试，搞几下就能懂了），主要涉及api：PostQueuedCompletionStatus（它可以触发一次iocp回调，也就是可以手动触发一次iocp回调，可以用来做多线程环境的锁）
控制台界面：控制台版坦克大战
下方代码中，没有写注释的地方，说明与icop网络无关也就是它们都不重要，重要的位置全部都有注释，复制下方代码就可以运行看效果
iocp带网络的例子：
客户端：
客户端只有一个main，只有socket相关函数，无iocp
客户端说明：
由于和客户端只用了socket相关函数，所以客户端不重要，重要的是服务端，它使用iocp网络实现，所以用手机开热点让电脑连接热点，然后用手机浏览器访问电脑的ip和服务端开启的端口就可以看iocp网络（iocp网络的意思是，socket 加 iocp配合，实现的网络数据的接收与发送），或者用路由器让手机和电脑在一个网络下也可以，所以如果只关心iocp网络，下方客户端的代码不需要看，用手机调试 或者 用电脑浏览器调试
客户端代码：
#define _WINSOCK_DEPRECATED_NO_WARNINGS #pragma comment(lib, "Ws2_32.lib") #include#include #include #include class COverlapped { public: /** 重叠结构 就是 OVERLAPPED（它的中文意思是重叠，所以称它是重叠结构） */ OVERLAPPED m_overlapped; DWORD m_operator; char m_buffer[4096]; SOCKET client = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED); COverlapped() { m_operator = 0; memset(&m_overlapped, 0, sizeof(m_overlapped)); memset(m_buffer, 0, sizeof(m_buffer)); } }; int main(int argc, char* argv[]) { WSADATA wsaData; if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) { printf("WSAStartup() error"); return -1; } SOCKET hSocket; hSocket = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN servAddr{}; servAddr.sin_family = AF_INET; servAddr.sin_addr.s_addr = inet_addr("127.0.0.1"); servAddr.sin_port = htons(9527); /*********************************************连接*********************************************************/ if (connect(hSocket, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR) { printf("connect error"); return -1; } /*********************************************连接完成*********************************************************/ /*********************************************等待接收服务端发来的数据*********************************************************/ char message[30]; int strlen = recv(hSocket, message, 30, 0); if (strlen == -1) { printf("recv error"); return -1; } printf("recv message: %s\n", message); /*********************************************等待接收服务端发来的数据结束*********************************************************/ /*********************************************给服务端发数据*********************************************************/ /* 下方代码（char* str = XXXX这个代码）是写着玩的，现在没有任何作用，所以给注释了 char* str = (char*)"fkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffkhsklffk"; */ for (int i = 4; i < 100; i++) { ; /* send函数发送一个数据给socket std::to_string(i).c_str() 把一个数字转成字符串 */ send(hSocket, std::to_string(i).c_str(), ::strlen(std::to_string(i).c_str())+1, 0); printf("%s\n", std::to_string(i).c_str()); // Sleep(1000); // WSASend函数发送数据，这里的WSASend没有绑定iocp（这个代码无iocp，单纯的socket），所以它只能发送，发送成功还是发送不成功，没有iocp没法知道结果 /* WSABUF m_wsabuffer{}; DWORD m_received; DWORD m_flags; m_flags = 0; m_received = 0; COverlapped overlapped2{}; overlapped2.m_operator = 2; m_wsabuffer.buf = (char*)std::to_string(i).c_str(); m_wsabuffer.len = ::strlen(std::to_string(i).c_str())+1; WSASend(hSocket, &m_wsabuffer, 1, &m_received, m_flags, &overlapped2.m_overlapped, NULL); int tt = WSAGetLastError(); int a = tt; */ } // 下方是用 WSASend函数 发送一个指定的字符串给服务器 /* WSABUF m_wsabuffer{}; DWORD m_received; DWORD m_flags; m_flags = 0; m_received = 0; COverlapped overlapped2{}; overlapped2.m_operator = 2; char* str = (char*)"fkhsklf"; m_wsabuffer.buf = str; m_wsabuffer.len = ::strlen(str) + 1; WSASend(hSocket, &m_wsabuffer, 1, &m_received, m_flags, &overlapped2.m_overlapped, NULL); */ /*********************************************给服务端发数据结束*********************************************************/ closesocket(hSocket); WSACleanup(); system("pause"); return 0; }
服务端：
服务端代码观看方式（观看思路）：
从main函数开始看，或者搜索 WSARecv、AcceptEx、WSASend、CreateIoCompletionPort、GetQueuedCompletionStatus这些关键字
iocp网络相关函数说明：
WSARecv是注册一个接收数据的iocp，当接收到数据会进入iocp回调函数，也就是 GetQueuedCompletionStatus退出阻塞状态，可以从第二个参数的内存地址得到接收的数据
AcceptEx是注册一个新连接的iocp，当新的连接连接成功后会进入iocp回调函数，也就是 GetQueuedCompletionStatus退出阻塞状态
WSASend是注册一个发送数据的iocp，当发送成功会进入iocp回调函数，也就是 GetQueuedCompletionStatus退出阻塞状态
CreateIoCompletionPort让一个socket绑定一个iocp
GetQueuedCompletionStatus获取一个iocp，如果没有iocp，将进入阻塞
iocp：iocp（完成端口）官方说明
大概意思就是当一个进程创建了iocp之后，操作系统会给创建一个队列，让这个队列与进程进行关联，专门给这个进程处理请求服务，由于它是队列所以支持线程安全，可以把iocp当作一个高性能锁，它比任意多线程安全机制都要快
服务端代码：
#define _WINSOCK_DEPRECATED_NO_WARNINGS #pragma comment(lib,"Ws2_32.lib") #pragma comment(lib,"Mswsock.lib") #include#include #include #include #include int i = 0; // 这个不要管，写着玩的 char strarr[999999]{};// 接收数据的缓存，也就是 WSARecv 接收的数据 class COverlapped { // 重叠结构 public: /** 只要有 OVERLAPPED 这个类型并且放在第一个位置，那这个结构体就可以成为重叠结构 */ OVERLAPPED m_overlapped; DWORD m_operator; int clientIndex; char m_buffer[4096]; COverlapped() { m_operator = 0; memset(&m_overlapped, 0, sizeof(m_overlapped)); memset(m_buffer, 0, sizeof(m_buffer)); } }; HANDLE hIOCP; SOCKET sock; /* 最多只能连接5个客户端，如果要更多的客户端，需要添加心跳包功能，用心跳包检测socket连接状态，也就是服务端给客户端发送一个数据，客户端接收到必须马上给服务端返回一个数据 否则视为当前sokcet已经断开连接需要释放资源，这样释放资源之后就可以给新的客户端用了，也就可以处理新的连接了 */ SOCKET clients[5]; int i2 = 1; // socket的索引，也就是 clients 它的索引 void iocp() { // SOCKET sock = socket(AF_INET, SOCK_STREAM, 0); // TCP WSADATA wsaData; if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) { printf("WSAStartup failed.\n"); return; } for (int i = 0; i < 5; i++) { clients[i] = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED); } // 创建一个套接字用于绑定iocp，让AcceptEx生效 sock = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED); //client = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED); if (sock == INVALID_SOCKET) { int ttt = WSAGetLastError(); int a = ttt; return; } // 重建一个iocp hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, sock, 4); // SOCKET client = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED); // sock与iocp绑定 CreateIoCompletionPort((HANDLE)sock, hIOCP, 0, 0); // 下方是设置套接字ip与端口 sockaddr_in addr; addr.sin_family = PF_INET;// PF_INET 与 AF_INET是一个东西，用哪一个都行，混着用也行 addr.sin_addr.s_addr = inet_addr("0.0.0.0");// 监听所有ip addr.sin_port = htons(9527); bind(sock, (sockaddr*)&addr, sizeof(addr)); // ip信息绑定socket listen(sock, 5); COverlapped _Aoverlapped; {}; // 创建重叠结构 _Aoverlapped.m_operator = 1; // 设置当前操作类型，用于在 GetQueuedCompletionStatus 函数的回调中使用 _Aoverlapped.clientIndex = 0; DWORD received = 0; // 固定写死 // AcceptEx是异步的，调用之后很快就会返回，投递给iocp一个新连接事件 if (AcceptEx(sock, clients[_Aoverlapped.clientIndex], _Aoverlapped.m_buffer, 0, sizeof(sockaddr_in) + 16, sizeof(sockaddr_in) + 16, &received, &_Aoverlapped.m_overlapped) == FALSE) { /* WSAGetLastError 获取上一个函数执行结果，只能针对套接字相关使用，它的返回值是上一个函数的执行状态，可以得到执行成功还是执行失败 它有许多错误类型，可以去 msdn(微软官方文档简称msdn) 搜 WSAGetLastError，然后从 WSAGetLastError函数说明的页面里可以找到返回值都有哪些以及返回值说明 */ if (WSAGetLastError() != WSA_IO_PENDING) { return; } } } unsigned int __stdcall ThreadFunc(void * a) { // 开启线程 while (true) // 代表一个线程 { LPOVERLAPPED pOverlapped{}; DWORD transferred = 0; DWORD key = 0; /* 第二个参数，也就是transferred可以得到有效字节数，也就是 WSARecv 接收数据的长度 依据tcp或udp协议不同，数据大会造成分包发送，分包是顺序的，不用担心数据会乱，所以需要在发送的数据包里，设置数据包大小 然后通过 transferred 判断数据包是否接收完毕，比如 transferred 它的数字小于，我们数据包里设置的大小，就说明数据包没有接收完毕，需要拼接数据 pOverlapped 获取重叠结构，重叠结构是用来在使用 iocp 时进行iocp内部的传参 hIOCP 绑定了什么socket，它就触发什么，如果socket没有与它绑定，任何操作都不会触发 GetQueuedCompletionStatus 函数，也就是无法让 GetQueuedCompletionStatus 函数退出阻塞状态 */ if (GetQueuedCompletionStatus(hIOCP, &transferred, &key, &pOverlapped, WSA_INFINITE)) { COverlapped* pO = CONTAINING_RECORD(pOverlapped, COverlapped, m_overlapped); switch (pO->m_operator) { case 1: { printf("AcceptEx\n"); /* 有客户端连接，这里把客户端连接绑定到 IOCP 里，如果不绑定，WSARecv会失效，WSASend可以发送 但是发送成功无法触发 GetQueuedCompletionStatus 函数的回调，也就是无法让 GetQueuedCompletionStatus 函数退出阻塞状态 */ CreateIoCompletionPort((HANDLE)clients[pO->clientIndex], hIOCP, 0, 0); /*********************************************************************************************************************************************/ DWORD Flags = 0; // 固定写死 DWORD dwRecv = 0; // 固定写死 COverlapped overlapped3{}; // 创建重叠结构，并初始化内存 overlapped3.m_operator = 3; // 设置当前操作类型，用于在 GetQueuedCompletionStatus 函数的回调中使用 overlapped3.clientIndex = pO->clientIndex; WSABUF m_wsabuffer2{}; // 接收数据的缓冲区结构 m_wsabuffer2.buf = strarr; // 设置缓冲区，也就是一块存放数据的内存，当Recv成功之后，会把数据写到这里 m_wsabuffer2.len = 999999; // 内存大小，buf只是一块内存，只有内存地址没有大小，所以这里告知程序此处内存有多大 /* 添加Recv监听，告诉iocp只要有Recv操作，也就是有人给我发了消息你就触发 GetQueuedCompletionStatus 函数的回调 然后通过 m_operator 就能知道这是什么操作，然后在对应的switch里处理 */ WSARecv(clients[overlapped3.clientIndex], &m_wsabuffer2, 1, &dwRecv, &Flags, &overlapped3.m_overlapped, NULL); /*********************************************************************************************************************************************/ /*0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000*/ sockaddr* pLocal = NULL, * pRemote = NULL; int nLocal = 0, nRemote = 0; /* GetAcceptExSockaddrs函数它的第一个参数是 AcceptEx 函数的第三个参数，AcceptEx函数会把本地ip和对方ip返回到第三个参数里 GetAcceptExSockaddrs函数它只是用来解析远程地址和本地地址的 */ GetAcceptExSockaddrs(&pO->m_buffer, 0, sizeof(sockaddr_in) + 16, sizeof(sockaddr_in) + 16, &pLocal, &nLocal, &pRemote, &nRemote); sockaddr_in* pP = (sockaddr_in*)pLocal; printf("本地IP：%s ", inet_ntoa(pP->sin_addr)); printf("对方端口号：%d \n", ntohs(pP->sin_port)); sockaddr_in* pR = (sockaddr_in*)pRemote; printf("对方IP：%s ", inet_ntoa(pR->sin_addr)); printf("对方端口号：%d \n", ntohs(pR->sin_port)); /*0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000*/ /*============================================================================================================================================*/ WSABUF m_wsabuffer{}; // 缓冲区，发送的数据内容 DWORD m_received = 0; // 固定写死 DWORD m_flags = 0; // 固定写死 DWORD received = 0; // 固定写死 COverlapped overlapped2{}; // 创建重叠结构 overlapped2.m_operator = 2; // 设置当前操作类型，用于在 GetQueuedCompletionStatus 函数的回调中使用 overlapped2.clientIndex = pO->clientIndex; char* str = (char*)"000"; m_wsabuffer.buf = str; // 发送的数据内容 m_wsabuffer.len = strlen(str) + 1; // 数据大小，C++里的字符串是以0结尾，strlen(str)计算的长度不包含0，所以这里+1 // 发送数据 WSASend(clients[overlapped3.clientIndex], &m_wsabuffer, 1, &m_received, m_flags, &overlapped2.m_overlapped, NULL); /*============================================================================================================================================*/ /*aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa*/ COverlapped overlapped{}; // 创建重叠结构 overlapped.m_operator = 1; // 设置当前操作类型，用于在 GetQueuedCompletionStatus 函数的回调中使用 overlapped.clientIndex = i2++; /* 当前是在 case 1 里，也就是当有了新的连接，它就会调用 GetQueuedCompletionStatus 函数的回调，然后再得到这是什么类型，如果类型是1就会进入 case 1 里，也就是会来段现在的位置 下方的写法，首先AcceptEx是注册一个新连接事件（准确说是投递到iocp的队列里一个连接请求），也就是告诉iocp，当有了新连接就通知 GetQueuedCompletionStatus 函数的回调 通知完AcceptEx注册了事件将被删除，被删除了，就说明下次没法触发了，所以这里再次注册 AcceptEx */ AcceptEx(sock, clients[overlapped.clientIndex], overlapped.m_buffer, 0, sizeof(sockaddr_in) + 16, sizeof(sockaddr_in) + 16, &received, &overlapped.m_overlapped); /*aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa*/ i++; break; } case 2: { // 这里是 WSASend 成功的处理 //printf("send %d--\n", i); printf("send %d -- %s\n", i, strarr); WSABUF m_wsabuffer{}; // 缓冲区，发送的数据内容 DWORD m_received = 0; // 固定写死 DWORD m_flags = 0; // 固定写死 DWORD received = 0; // 固定写死 COverlapped overlapped2{}; // 创建重叠结构 overlapped2.m_operator = 2; // 设置当前操作类型，用于在 GetQueuedCompletionStatus 函数的回调中使用 overlapped2.clientIndex = pO->clientIndex; char* str = (char*)"000"; m_wsabuffer.buf = str; // 发送的数据内容 m_wsabuffer.len = strlen(str) + 1; // 数据大小，C++里的字符串是以0结尾，strlen(str)计算的长度不包含0，所以这里+1 // 发送数据 // WSASend(clients[overlapped2.clientIndex], &m_wsabuffer, 1, &m_received, m_flags, &overlapped2.m_overlapped, NULL); break; } case 3: { // 这里是 WSARecv 成功的处理 printf("recv %d -- %s\n", i, strarr);// 客户端循环发送数据，这里 strarr 里的值只是当前接收的数据，接收过的数据会被覆盖，所以要创建一个缓冲区，做数据拼接，在这一行下断点就可以看出这个问题 DWORD Flags = 0; // 固定写死 DWORD dwRecv = 0; // 固定写死 COverlapped overlapped3{}; // 创建重叠结构，并初始化内存 overlapped3.m_operator = 3; // 设置当前操作类型，用于在 GetQueuedCompletionStatus 函数的回调中使用 overlapped3.clientIndex = pO->clientIndex; WSABUF m_wsabuffer2{}; // 接收数据的缓冲区结构 m_wsabuffer2.buf = strarr; // 设置缓冲区，也就是一块存放数据的内存，当Recv成功之后，会把数据写到这里 m_wsabuffer2.len = 999999; // 内存大小，buf只是一块内存，只有内存地址没有大小，所以这里告知程序此处内存有多大 /* 添加Recv监听，告诉iocp只要有Recv操作，也就是有人给我发了消息你就触发 GetQueuedCompletionStatus 函数的回调 然后通过 m_operator 就能知道这是什么操作，然后在对应的switch里处理 */ WSARecv(clients[overlapped3.clientIndex], &m_wsabuffer2, 1, &dwRecv, &Flags, &overlapped3.m_overlapped, NULL); break; } default: break; } } } return 0; } bool 控制台事件处理(DWORD type) { switch (type) { case CTRL_CLOSE_EVENT: { // 点击控制台关闭时，会来到这里 for (int i = 0; i < clientLen; i++) { closesocket(clients[i]); clients[i] = INVALID_SOCKET; } closesocket(sock); CloseHandle(hIOCP); WSACleanup(); printf("关闭套接字完成"); return false; } default: break; } } int main() { // 给控制台添加一个监听，为了实现控制台关闭时关闭socket、iocp相关句柄资源 if (!SetConsoleCtrlHandler((PHANDLER_ROUTINE)控制台事件处理, true)) return 0; // 初始化 iocp 环境 iocp(); // iocp处理事件线程，主要看 ThreadFunc函数 里的case 1里的代码，看懂了它，就懂iocp网络了 _beginthreadex(NULL, 0, ThreadFunc, (LPVOID)hIOCP, 0, NULL); /*=================================下方支持控制台输入同时避免主线程结束导致iocp网络结束=================================*/ HANDLE ConsoleWin; INPUT_RECORD eventMsg; DWORD Pointer; ConsoleWin = GetStdHandle(STD_INPUT_HANDLE); // 获取控制台句柄，没有句柄没法获取它的输入 while (1) { // ReadConsoleInput(ConsoleWin, &eventMsg, 1, &Pointer);//Read input msg if (eventMsg.EventType == MOUSE_EVENT && eventMsg.Event.MouseEvent.dwButtonState == FROM_LEFT_1ST_BUTTON_PRESSED) { printf("Right button clicked."); } if (eventMsg.EventType == MOUSE_EVENT && eventMsg.Event.MouseEvent.dwEventFlags == RIGHTMOST_BUTTON_PRESSED) { printf("Left button double clicked."); } if (eventMsg.EventType == KEY_EVENT) { /* eventMsg.Event.KeyEvent.uChar.AsciiChar只能获取键盘左边英文字母、数字、标点符号 其它的要根据键盘的虚拟键码来得到（eventMsg.Event.KeyEvent.wVirtualKeyCode） */ printf("uChar：%c\t", eventMsg.Event.KeyEvent.uChar.AsciiChar); /* eventMsg.Event.KeyEvent.dwControlKeyState是用来控制键的状态 也就是Ctrl、Alt、大写键的状态 下方是 eventMsg.Event.KeyEvent.dwControlKeyState 的使用方式 */ int daxie = eventMsg.Event.KeyEvent.dwControlKeyState & CAPSLOCK_ON; int zCtrl = eventMsg.Event.KeyEvent.dwControlKeyState & LEFT_CTRL_PRESSED ; int nu = eventMsg.Event.KeyEvent.dwControlKeyState & NUMLOCK_ON; if (nu == NUMLOCK_ON) { printf("按下了nu\t"); } if (daxie == CAPSLOCK_ON) { printf("开启大写\t"); } if (zCtrl == LEFT_CTRL_PRESSED) { printf("按下了做Ctrl键\t"); } printf("%x\t", eventMsg.Event.KeyEvent.dwControlKeyState); // 虚拟键码 printf("当前：%X", eventMsg.Event.KeyEvent.wVirtualKeyCode); printf("\n"); } } printf("\n退出\n"); return 0; }