WSAOVERLAPPED
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4/8/2010
This structure provides a communication medium between the initiation of an overlapped I/O operation and its subsequent completion.
Note
With the exception of SIO_ROUTING_INTERFACE_CHANGE and SIO_ADDRESS_LIST_CHANGE, all network drivers running in the kernel and calling into Winsock APIs cannot use overlapped IO. For more information, see WSARecv, WSARecvFrom, WSASend, WSASendTo, and WSAIoctl.
Syntax
typedef struct _WSAOVERLAPPED {
DWORD Internal;
DWORD InternalHigh;
DWORD Offset;
DWORD OffsetHigh;
WSAEVENT hEvent;
} WSAOVERLAPPED, *LPWSAOVERLAPPED;
Members
- Internal
Reserved for internal use. The Internal member is used internally by the entity that implements overlapped I/O. For service providers that create sockets as installable file system (IFS) handles, this parameter is used by the underlying operating system. Other service providers (non-IFS providers) are free to use this parameter as necessary.
- InternalHigh
Reserved. Used internally by the entity that implements overlapped I/O. For service providers that create sockets as IFS handles, this parameter is used by the underlying operating system. Non-IFS providers are free to use this parameter as necessary.
- Offset
Reserved for use by service providers.
- OffsetHigh
Reserved for use by service providers.
- hEvent
If an overlapped I/O operation is issued without an I/O completion routine (lpCompletionRoutine is null), then this parameter should either contain a valid handle to a WSAEVENT object or be null. If lpCompletionRoutine is non-null then applications are free to use this parameter as necessary.
Requirements
| Header | winsock2.h |
| Windows Embedded CE | Windows CE .NET 4.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |