创建数据： SOCKET sListen = ::WSASocket(AF_INET,SOCK_STREAM,IPPROTO_TCP, NULL,0,WSA_FLAG_OVERLAPPED
Overlapped; WSABUF wsabuf; int nBytes;..., sizeof(lpIOContext->Overlapped)); strcpy(buffer, "ok........, &dwFlags, &lpIOContext->Overlapped, NULL); if( nRet == SOCKET_ERROR && (ERROR_IO_PENDING !..., &io_data->Overlapped, NULL) == SOCKET_ERROR) { if (WSAGetLastError() == WSA_IO_PENDING) { cout..., 0, sizeof(lpIOContext->Overlapped)); while ( lpfnAcceptEx(lpIOContext->server, lpIOContext->client,
异步串口通信的实现4.1 打开串口使用CreateFile函数打开串口时，需要指定FILE_FLAG_OVERLAPPED标志以启用异步模式。...OVERLAPPED overlappedRead;ZeroMemory(&overlappedRead, sizeof(OVERLAPPED));overlappedRead.hEvent = CreateEvent...= ERROR_IO_PENDING) { // 读取失败处理}4.5 异步发送串口数据使用WriteFile函数进行异步发送时，同样需要提供一个OVERLAPPED结构体。...OVERLAPPED overlappedWrite;ZeroMemory(&overlappedWrite, sizeof(OVERLAPPED));overlappedWrite.hEvent =...异步串口通信的注意事项在异步操作中，确保正确处理OVERLAPPED结构体和事件句柄。使用ClearCommError和GetCommError函数来处理串口错误。
结构 这函数的使用与之前文件完成端口中完成历程一样 下面我们将之前文件完成端口的例子进行改写，如下： typedef struct tagIOCP_OVERLAPPED { OVERLAPPED...Overlapped; HANDLE hFile; //操作的文件句柄 DWORD dwDataLen; //当前操作数据的长度 LPVOID pData; //操作数据的指针...DWORD dwWrittenLen; //写入文件中的数据长度 }IOCP_OVERLAPPED, *LPIOCP_OVERLAPPED; #define MAX_WRITE_THREAD...pIocpOverlapped = (LPIOCP_OVERLAPPED)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IOCP_OVERLAPPED...lpIocpOverlapped = (LPIOCP_OVERLAPPED)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IOCP_OVERLAPPED
关于图像采集过程中,相机操作有两种常见的方法:“non-overlapped”的曝光和“overlapped”的曝光。...Fig.1 Non-overlapped Exposure 虽然非重叠(“non-overlapped”)的模式,可适合于许多情况下,但它并不是最有效的方式。...相机“重叠”(“overlapped”)曝光的方式见图2所示。...Fig.2 overlapped Exposure 从上边两个图中,我们可以知道在“non-overlapped”的曝光和“overlapped”的曝光模式底下,一帧图像的周期存在着这样的关系...: "overlapped”的曝光模式下: FramePeriod ≤Exposure Time + ReadoutTime “non-overlapped”的曝光模式下:FramePeriod > Exposure
用 LPPER_IO_DATA ppiod = new PER_IO_DATA; ZeroMemory(&(ppiod->overlapped), sizeof(OVERLAPPED));...自定义结构可以任意设置，唯一的要求就是单IO数据结构的第一个成员必须是OVERLAPPED。...overlapped; //第一项必须为OVERLAPPED SOCKET cs; //记录客户端socket char buf[BUF_LEN]; //发送：此buf存储待发送数据，接收...), sizeof(OVERLAPPED)); //PER_IO_DATA在使用前必须清空OVERLAPPED成员 ppiod->operationType = OP_ACCEPT; //待会从GetQueuedCompletionStatus...), sizeof(OVERLAPPED)); ppiod->operationType = OP_RECV; //请求类型是接收 memset(ppiod->buf, 0, BUF_LEN); /
当对这个对象发出操作请求后，过一段时间就可以使用该handle和Overlapped对象进行查询，之前的那个请求是否完成。下面是一个例子： 用overlapped模型读一个磁盘文件内容。...使用之二： 事件通知 每一个异步操作，都有一个OVERLAPPED的instance与之相关联，因此，当之前提交的异步操作完成后，可以使用OVERLAPPED中的hEvent来获取通知。...看看OVERLAPPED的定义，这个回调函数是没法跟OVERLAPPED进行关联了，那在哪里关联呢？...只能使用一个file handle； OVERLAPPED使用之四： IOCP IOCP是在OVERLAPPED IO基础上的扩展。功能更加强大。...所以，IOCP是以OVERLAPPED IO为基础的完成通知机制，对OVERLAPPED数据结构中的信息被不真正关心。但是必须要有一个OVERLAPPED的instance。
{ OVERLAPPED overlapped; ULONG ulNetworkEvents; DWORD dwFlags; DWORD wConnectPort;...DWORD dwTransBytes; char *pBuf; DWORD dwBufSize; SOCKET sConnect; }CLIENT_OVERLAPPED, *LPCLIENT_OVERLAPPED...lpoc = (LPCLIENT_OVERLAPPED)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CLIENT_OVERLAPPED))...{ OVERLAPPED overlapped; char *pBuf; size_t dwBufSize; DWORD dwFlag; DWORD dwTransBytes...; long lNetworkEvents; SOCKET sListen; SOCKET sClient; }CLIENT_OVERLAPPED, *LPCLIENT_OVERLAPPED
* pExOl = (ST_EXT_OVERLAPPED*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(ST_EXT_OVERLAPPED)...* pExOl = (ST_EXT_OVERLAPPED*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(ST_EXT_OVERLAPPED)...在IO操作中传入一个OVERLAPPED结构 5....* pExOl = (ST_EXT_OVERLAPPED*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(ST_EXT_OVERLAPPED)...* pExitMsg = (ST_EXT_OVERLAPPED*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(ST_EXT_OVERLAPPED
SOCKADDR_STORAGE clientAddr; //客户端的地址 }PER_HANDLE_DATA,*LPPER_HANDLE_DATA; //但IO操作数据 typedef struct{ OVERLAPPED...overlapped; WSABUF buffer; //一个数据缓冲区,用于WSASend/WSARecv中的第二个参数 char dataBuffer[DATA_LENGTH...thread); } //创建一个监听套接字(进行重叠操作) Listen = WSASocket(AF_INET,SOCK_STREAM,0,NULL,0,WSA_FLAG_OVERLAPPED...),0,sizeof(OVERLAPPED)); perIoData->operatorType = ACCEPT; //在使用AcceptEx前需要事先重建一个套接字用于其第二个参数...16)*2), sizeof(SOCKADDR_IN)+16,sizeof(SOCKADDR_IN)+16,&dwBytes, &(perIoData->overlapped
输出 是否重叠 输入样例1 3 1 5 2 9 1 3 2 4 5 6 7 8 5 7 7 9 2 5 1 0 9 4 2 9 输出样例1 not overlapped overlapped...overlapped 思路分析 这道题坑很多。...if self.x1>temp.x2 or self.y1>temp.y2 or temp.x1>self.x2 or temp.y1>self.y2: print("not overlapped...") return print('overlapped') return n=int(input()) for i in range(0,n):
第6个参数是一个标志，如果要创建重叠IO的SOCKET，需要将这个参数设置为WSA_FLAG_OVERLAPPED。...扩展的断开连接的Winsock API) WSANSPIoctl (用于操作名字空间的重叠I/O版扩展控制API) 那么如果使用上述函数但是传入一个非阻塞的SOCKET会怎么样呢，这些函数只看是否传入OVERLAPPED...利用该模型首先需要把一个event对象绑定到OVERLAPPED(WinSokc中一般是WSAOVERLAPPED)上，然后利用这个OVERLAPPED结构来进行IO操作.如:WSASend/WSARecv...下面是一个事件通知模型的例子 typedef struct _tag_CLIENTCONTENT { OVERLAPPED Overlapped; SOCKET sClient;...下面是一个使用完成过程的模型 typedef struct _tag_OVERLAPPED_COMPILE { WSAOVERLAPPED overlapped; LONG lNetworks
*p_ol = &pIoContext->m_Overlapped; pIoContext->ResetBuffer(); pIoContext->m_OpType = RECV_POSTED...*p_ol = &pAcceptIoContext->m_Overlapped; // 为以后新连入的客户端先准备好Socket( 这个是与传统accept最大的区别 )...OVERLAPPED结构体后面再增加一些字段来标识我们是收数据动作还是发数据动作。...而这个扩展的OVERLAPPED结构体，因为是针对每一次IO操作的，所以叫“Per IO Data”。...因此这个数据结构的第一个字段必须是一个OVERLAPPED结构体： typedef struct _PER_IO_CONTEXT { OVERLAPPED m_Overlapped
lpOverlapped [in, out, optional] （可选）指向OVERLAPPED结构的指针, 如果在未指定FILE_FLAG_OVERLAPPED的情况下打开hDevice...如果使用FILE_FLAG_OVERLAPPED标志打开hDevice，则该操作将作为重叠（异步）操作执行。...在这种情况下，lpOverlapped必须指向包含事件对象句柄的有效OVERLAPPED结构。 否则，该功能将以不可预知的方式失败。...(c)fdwAttrsAndFlags参数可指定FILE_FLAG_OVERLAPPED，以指示返回的句柄可用于重叠（异步）I / O操作。...CreateFile Device Input and Output Control (IOCTL) GetOverlappedResult GetQueuedCompletionStatus OVERLAPPED
一般我们会定义一个扩展来OVERLAPPED结构来标识不同的完成通知，所以这个参数一般不用传入NULL。...第四个参数是OVERLAPPED结构。 第五个参数表示等待的时间，如果填入INFINITE则会一直等到有IO操作完成。...完成端口的示例： 下面是一个完成端口的示例 typedef struct _tag_MY_OVERLAPPED { OVERLAPPED m_overlapped; SOCKET m_sClient...DWORD m_dwNumberOfBytesRecv; DWORD m_dwFlags; char *m_pszBuf; LONG m_dwBufSize; }MY_OVERLAPPED..., *LPMY_OVERLAPPED; unsigned int __stdcall IOCPThread(LPVOID lpParameter); #define BUFFER_SIZE 1024
Own关系（Own-Owned）叫做拥有关系，拥有关系的两个窗口，准确说不能叫父子窗口，而是叫拥有窗口和被拥有窗口，他们都是WS_POPUP或WS_OVERLAPPED窗口，比如程序的主窗口和桌面就是Own...关系，其特点： 第一，Owned窗口在创建时带有WS_POPUP或WS_OVERLAPPED属性 第二，Owned窗口和Own窗口的生命周期是独立的，Own窗口销毁的时候，Owned窗口不会自动销毁，可以修改其...CreateWindow() API中的参数hWndParent，虽然参数名称带有Parent，其实当dwStyle带有WS_POPUP或WS_OVERLAPPED时是指定Own窗口。...如果原窗口是POPUP或OVERLAPPED窗口调用SetParent()API时会建立Parent关系，但出于兼容考虑SetParent()内部还是保留原窗口属性（未修改为WS_CHILD），所以SPY
com_.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED...= 1024; // read_size = min(read_size, (DWORD)com_stat.cbInQue); // 开始异步读取 OVERLAPPED...over_lapped; memset(&over_lapped, 0, sizeof(OVERLAPPED)); over_lapped.hEvent = CreateEvent...over_lapped; memset(&over_lapped, 0, sizeof(OVERLAPPED)); over_lapped.hEvent = CreateEvent(NULL...写也是一样，我们可以用 GetOverlappedResult 或 WaitForSingleObject 来等待操作事件完成（记得要初始化 OVERLAPPED 否则会报错的）。
：PER_IO_DATA * 结构体功能：重叠I/O需要用到的结构体，临时记录IO数据 **/ const int DataBuffSize = 2 * 1024; typedef struct { OVERLAPPED...overlapped; WSABUF databuff; char buffer[DataBuffSize]; int BufferLen; int operationType; SOCKET client...), sizeof(OVERLAPPED)); PerIoData->databuff.len = 1024; PerIoData->databuff.buf = PerIoData->buffer;...), 0, sizeof(OVERLAPPED)); PerIoData->operationType = RECV; //将状态设置成接收 //设置WSABUF结构 PerIoData-...), sizeof(OVERLAPPED)); // 清空内存 PerIoData->databuff.len = 1024; PerIoData->databuff.buf = PerIoData->
DEFAULTSIZE 1024 /** * 结构体名称：PER_IO_DATA * 结构体功能：重叠I/O需要用到的结构体，临时记录IO数据 **/ typedef struct { OVERLAPPED...overlapped; char buffer[DEFAULTSIZE]; int BufferLen; bool readflag; }PER_IO_DATA,...send(PerSocketData->socket, PerIoData->buffer, strlen(PerIoData->buffer)+1, 0); memset(&PerIoData->overlapped..., 0, sizeof(PerIoData->overlapped)); PerIoData->readflag = false; WSABUF wsabuf; wsabuf.buf = PerIoData...PerIoData->buffer); iRes = WSASend(PerSocketData->socket, &wsabuf, 1, &RecvBytes, Flags, &PerIoData->overlapped
(DWORD)EXIT_CODE, NULL); 这样工作线程里面就可以使用EXIT_CODE来作为退出标志： DWORD ThreadFunction() { OVERLAPPED...初始化准备好的各种缓冲区如何在工作线程里面引用到的关键就在于绑定完成端口时CompletionKey和准备收发缓冲区时OVERLAPPED结构体的使用， CompletionKey对应PER Socket...Data， OVERLAPPED对应Per IO Data，即CompletionKey是单Socket数据，OVERLAPPED是单IO数据。
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