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LPOVERLAPPED_COMPLETION_ROUTINE Function Pointer

Points to a function that notifies the host when an overlapped (that is, asynchronous) I/O to a device has completed.


typedef VOID (*LPOVERLAPPED_COMPLETION_ROUTINE) (
        [in] DWORD  dwErrorCode,
        [in] DWORD  dwNumberOfBytesTransfered,
        [in] LPVOID lpOverlapped
);

dwErrorCode

[in] A value that is an error code if the device has been closed; otherwise, this value is zero.

Closing a device causes all pending I/O to the device to be completed immediately.

dwNumberOfBytesTransfered

[in] The number of bytes transferred by the I/O operation.

lpOverlapped

[in] A pointer to a structure that contains information to be used to complete the I/O request.

The function to which LPOVERLAPPED_COMPLETION_ROUTINE points is a callback function and must be implemented by the writer of the hosting application. The callback function allows the host to process the completed I/O request.

Platforms: Windows 2000, Windows XP, Windows Server 2003 family

Header: MSCorEE.idl

Library: MSCorWks.dll

.NET Framework Version: 2.0, 1.1, 1.0

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