TCP-事件模型

#include "main.h"VOID Server_write_error()
{}/*1.打开网络库
* 2.校验网络库版本
* 3.创建SOCKET
* 4.绑定IP地址和端口
* 5.开始监听
* 6.创建客户端socket/接受链接
* 7.与客户端收发消息
* 8.(6.7)两步的函数accept，send,recv 有堵塞，可以用select解决，这种函数可以处理小型网络
*/
int create(const char* IpAdress)
{WORD wVersionRequested;WSADATA wsaData;int err;/* 使用Windef.h中声明的MAKEWORD（低字节、高字节）宏 */wVersionRequested = MAKEWORD(2, 2);/*启用网络链接库，调用的封装库命令*/err = WSAStartup(wVersionRequested, &wsaData);if (err != 0) {/* Tell the user that we could not find a usable *//* Winsock DLL.                                  */printf("WSAStartup failed with error: %d\n", err);return -1;}/*确认WinSock DLL支持2.2*/if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {/* Tell the user that we could not find a usable *//* WinSock DLL.                                  */printf("Could not find a usable version of Winsock.dll\n");//清理网络库WSACleanup();return -1;}//创建套接字。 创建网络类型 tcp或者updSOCKET socketServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (INVALID_SOCKET == socketServer){string ret = to_string(WSAGetLastError());MessageBoxA(0, "error_socket",ret.c_str(),  0);//清理网络库WSACleanup();return -1;}//设置sockaddr结构sockaddr_in saServer;saServer.sin_family = AF_INET;saServer.sin_addr.s_addr = INADDR_ANY;saServer.sin_port = htons(9999);// 绑定本机（服务器）IP和端口//sockaddr结构中的信息if (SOCKET_ERROR == bind(socketServer, (SOCKADDR*)&saServer, sizeof(saServer))){string ret = to_string(WSAGetLastError());MessageBoxA(0, "error_bind", ret.c_str(),  0);//释放stocketclosesocket(socketServer);//清理网络库WSACleanup();return -1;}/*监听本机(服务器)的套接字*/if (SOCKET_ERROR == listen(socketServer, SOMAXCONN)){string ret = to_string(WSAGetLastError());MessageBoxA(0, "error_listen", ret.c_str(),  0);//释放stocketclosesocket(socketServer);//清理网络库WSACleanup();return -1;}fd_es_set setSockets;memset(&setSockets,0,sizeof(setSockets));/*创建一个套接字 事件*/HANDLE eventSerevr = WSACreateEvent();if (WSA_INVALID_EVENT == eventSerevr){string ret = to_string(WSAGetLastError());MessageBoxA(0, "error_WSACreateEventServer", ret.c_str(),  0);//释放stocketclosesocket(socketServer);//清理网络库WSACleanup();return -1;}/*将服务器socket和事件绑定*/if (SOCKET_ERROR == WSAEventSelect(socketServer, eventSerevr, FD_ACCEPT)){string ret = to_string(WSAGetLastError());MessageBoxA(0, "error_WSAEventSelecttServer", ret.c_str(), 0);//释放stocketclosesocket(socketServer);//清理网络库WSACleanup();return -1;}/*将服务器socket和事件对象句柄写进结构体*/setSockets.sockall[setSockets.count] = socketServer;setSockets.eventall[setSockets.count] = eventSerevr;setSockets.count++;while (true){   /*为了防止一个用户死循环访问服务器，造成事件一直处理同一个客户端，进行优化，循环遍历单个数组询问是否有事件信号*//*同时WSAWaitForMultipleEvents函数参数一每次只能处理64个事件数组，而我们改成每次处理1个，循环处理变相能处理无穷多的事件了*/DWORD RET = 0;for (DWORD Index = 0; Index <setSockets.count; Index++){/*等待事件：有事件产生后返回对应事件的下标*/RET = WSAWaitForMultipleEvents(1, &setSockets.eventall[Index], false, 0, false);/*返回错误*/if (WSA_WAIT_FAILED == RET){string ret = to_string(WSAGetLastError());MessageBoxA(0, "error_WSAWaitForMultipleEvents", ret.c_str(), 0);continue;}/*等待超时检测*/if (WSA_WAIT_TIMEOUT == RET){continue;}//   DWORD Index = RET - WSA_WAIT_EVENT_0;/*枚举事件：获取事件类型，并重置其的信号*/WSANETWORKEVENTS GetlpNetworkEvents;if (SOCKET_ERROR == WSAEnumNetworkEvents(setSockets.sockall[Index], setSockets.eventall[Index], &GetlpNetworkEvents)){string ret = to_string(WSAGetLastError());MessageBoxA(0, "error_WSAEnumNetworkEvents", ret.c_str(), 0);continue;}/******** FD_ACCEPT 可能是组合指令，故需要 & 判断*//*客户端connect会依次触发FD_ACCEPT 和 FD_WRITE*/if (GetlpNetworkEvents.lNetworkEvents & FD_ACCEPT){if (0 == GetlpNetworkEvents.iErrorCode[FD_ACCEPT_BIT]){//正常处理sockaddr_in clientMsg = { 0 };int clientMsg_size = sizeof(clientMsg);/*得到客户端信息并返回客户端socket*/SOCKET socketClient = accept(setSockets.sockall[Index], (sockaddr*)&clientMsg, &clientMsg_size);printf("%d.%d.%d.%d.%d \n", clientMsg.sin_addr.S_un.S_un_b.s_b1,clientMsg.sin_addr.S_un.S_un_b.s_b2,clientMsg.sin_addr.S_un.S_un_b.s_b3,clientMsg.sin_addr.S_un.S_un_b.s_b4,clientMsg.sin_port);if (INVALID_SOCKET == socketClient)continue;/*创建一个套接字 事件*/HANDLE eventClient = WSACreateEvent();if (WSA_INVALID_EVENT == eventClient){//释放stocketclosesocket(socketClient);continue;}/*将客户端socket和事件绑定*/if (SOCKET_ERROR == WSAEventSelect(socketClient, eventClient, FD_READ | FD_WRITE | FD_CLOSE)){//释放stocketclosesocket(socketClient);//关闭事件对象WSACloseEvent(eventClient);continue;}/*完成上面步骤后将这个客户端数据放入结构体*/setSockets.sockall[setSockets.count] = socketClient;setSockets.eventall[setSockets.count] = eventClient;setSockets.count++;}else{continue;}}/*********FD_WRITE 可能是组合指令，故需要 & 判断*//*客户端connect会依次触发FD_ACCEPT 和 FD_WRITE*/if (GetlpNetworkEvents.lNetworkEvents & FD_WRITE){if (0 == GetlpNetworkEvents.iErrorCode[FD_WRITE_BIT]){//正常处理//accept会触发一次，一般用于链接服务器后初始化char sendmsg[] = "connect_success";if (SOCKET_ERROR == send(setSockets.sockall[Index], sendmsg, strlen(sendmsg), 0)){continue;}}else{continue;}}/*********FD_READ 可能是组合指令，故需要 & 判断*/if (GetlpNetworkEvents.lNetworkEvents & FD_READ){if (0 == GetlpNetworkEvents.iErrorCode[FD_READ_BIT]){//正常处理char recvmsg[1024] = { 0 };if (SOCKET_ERROR == recv(setSockets.sockall[Index], recvmsg, sizeof(recvmsg), 0)){continue;}printf("read：%s\n", recvmsg);char sendmsg[] = "recv_success";if (SOCKET_ERROR == send(setSockets.sockall[Index], sendmsg, strlen(sendmsg), 0)){continue;}}else{continue;}}/*********FD_CLOSE 可能是组合指令，故需要 & 判断*/if (GetlpNetworkEvents.lNetworkEvents & FD_CLOSE){{//正常处理//sockaddr_in clientMsg = { 0 };//int clientMsg_size = sizeof(clientMsg);//getsockname(setSockets.sockall[Index], (sockaddr*)&clientMsg, &clientMsg_size);//printf("client下线：%d.%d.%d.%d.%d \n", clientMsg.sin_addr.S_un.S_un_b.s_b1,//    clientMsg.sin_addr.S_un.S_un_b.s_b2,//    clientMsg.sin_addr.S_un.S_un_b.s_b3,//    clientMsg.sin_addr.S_un.S_un_b.s_b4,//    clientMsg.sin_port);printf("client下线");//释放stocketclosesocket(setSockets.sockall[Index]);//关闭事件对象WSACloseEvent(setSockets.eventall[Index]);/*将这个事件和socket移除数组，取巧方法：由于事件是无序的，把数组最后一个数据放进移除的数据的位置，并将数组大小-1*/setSockets.sockall[Index] = setSockets.sockall[setSockets.count - 1];//数组从0开始,-1才是正确位置setSockets.eventall[Index] = setSockets.eventall[setSockets.count - 1];//数组从0开始,-1才是正确位置setSockets.count--;}}} }system("pause");/*释放整个结构体，可能有些事件和socket已经被释放过了，不影响*/for (int i = 0; i < setSockets.count; i++){//释放stocketclosesocket(setSockets.sockall[i]);//关闭事件对象WSACloseEvent(setSockets.eventall[i]);}//清理网络库WSACleanup();
}int main()
{//  create("127.0.0.1");return 0;
}

利用windows的网络事件函数，系统将自动用异步的方式帮我们查看socket消息，接收到消息后，我们将无序的查看接收到的消息（比如：我们有事件[5]，先后接收到45321送来的消息，事件只能接收到12345发来了消息，并不能知道先后顺序，故只能按12345的顺序处理消息），而消息机制本质和事件差不多，区别就是消息机制由系统的消息队列记录先后顺序，会按45321的顺序处理，处理更合理