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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| -
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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OVERLAPPED
The OVERLAPPED structure contains information used in asynchronous input and output (I/O).
typedef struct _OVERLAPPED { // o
DWORD Internal;
DWORD InternalHigh;
DWORD Offset;
DWORD OffsetHigh;
HANDLE hEvent;
} OVERLAPPED;
Members
Internal
Reserved for operating system use. This member, which specifies a
system-dependent status, is valid when the GetOverlappedResult function returns without setting the extended error information to
ERROR_IO_PENDING.
InternalHigh
Reserved for operating system use. This member, which specifies the length of
the data transferred, is valid when the GetOverlappedResult function returns TRUE.
Offset
Specifies a file position at which to start the transfer. The file position is
a byte offset from the start of the file. The calling process sets this member
before calling the ReadFile or WriteFile function. This member is ignored when reading from or writing to named pipes
and communications devices.
OffsetHigh
Specifies the high word of the byte offset at which to start the transfer.
This member is ignored when reading from or writing to named pipes and
communications devices.
hEvent
Identifies an event set to the signaled state when the transfer has been
completed. The calling process sets this member before calling the ReadFile, WriteFile, ConnectNamedPipe, or TransactNamedPipe function.
Remarks
You can use the HasOverlappedIoCompleted macro to determine whether an asynchronous I/O operation has completed. You
can use the CancelIo function to cancel an asynchronous I/O operation.
See Also
CancelIo, ConnectNamedPipe, CreateFile, GetOverlappedResult, HasOverlappedIoCompleted, ReadFile, ReadFileEx, TransactNamedPipe, WriteFile, WriteFileEx
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