windows下使用重叠IO(OVERLAPPE)命名管道服务端

一个命名管道服务端的代码例子：

 

void CreateMyPipe(){char recvMsg[1000] = {0};char sendMsg[1000] = {0};DWORD uBufferToRead = 0, uBufferToWrite = 0;BYTE sd[SECURITY_DESCRIPTOR_MIN_LENGTH];SECURITY_ATTRIBUTES sa; //安全熟悉符，在WIN NT6系统上是必需的sa.nLength = sizeof(sa);sa.bInheritHandle = TRUE;sa.lpSecurityDescriptor = &sd;InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION);SetSecurityDescriptorDacl(&sd, TRUE, (PACL) 0, FALSE); //创建有名管道，管道名以//./pipe/namedpipe的方式//PIPE_ACCESS_DUPLEX 允许双功，既可以双向同时操作//FILE_FLAG_OVERLAPPED 允许异步IO，即重叠方式hPipe = CreateNamedPipe(L"////.//pipe//namedpipe",PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, 0, 1, 1024, 1024, 0, &sa);if ( INVALID_HANDLE_VALUE == hPipe ){return ;}hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); // 创建一个事件 if (INVALID_HANDLE_VALUE == hEvent){return;}OVERLAPPED ovlap;ZeroMemory(&ovlap, sizeof(OVERLAPPED));ovlap.hEvent = hEvent; //将一个事件与重叠IO绑定while(bRunning){/* 等待客户连接 , 采用了重叠方式, 该函数会立即返回不会阻塞*/if (!ConnectNamedPipe(hPipe, &ovlap)) {TRACE(L"开始监听");;/* 由于函数会立即返回，所以在没有连接的时候不会阻塞会返回，这个时候要判断错误失败的原因*/if (ERROR_IO_PENDING != GetLastError()){break ; //连接失败}}/* 阻塞状态下，等待管道另一端的连入，当一个连接到来的时候，ovlap.hEvent会立即变为有信号状态 */if (WAIT_FAILED == WaitForSingleObject(ovlap.hEvent, INFINITE)){TRACE(L"等待/n");break ; //等待失败}while( ReadFile(hPipe, recvMsg, sizeof(recvMsg), &uBufferToRead, NULL) > 0 ){OutputDebugStringA(recvMsg); //获得信息 recvMsg//对recvMsg处理后，获得sendMsg，将其发送到管道的另一端memset(sendMsg, 0, sizeof(sendMsg));sprintf(sendMsg, "for test");if(WriteFile(hPipe, sendMsg, strlen(sendMsg), &uBufferToWrite, NULL)>0){TRACE(L"发送成功");}else{TRACE(L"发送失败");}}if (!g_bRunning) //g_bRunning全局变量，当程序退出时，为false{CloseHandle(hEvent);CloseHandle(hPipe);}}CloseHandle(hEvent);CloseHandle(hPipe);}