Points to a function that notifies the host when an overlapped (that is, asynchronous) I/O to a device has completed.
This function pointer has been deprecated in the .NET Framework 4.
typedef VOID (*LPOVERLAPPED_COMPLETION_ROUTINE) ( [in] DWORD dwErrorCode, [in] DWORD dwNumberOfBytesTransfered, [in] LPVOID lpOverlapped );
[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.
[in] The number of bytes transferred by the I/O operation.
[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: See System Requirements.
.NET Framework Versions: Available since 1.0