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Appendix D
Watchdog Timer Programming on WinCE
PPC-2115 User Manual
D-2
ni.com
can use these control codes with DeviceIoControl to perform
driver-specific functions.
•
lpInBuffer
(in) Long pointer to a buffer that contains the data required to perform
the operation. This parameter can be NULL if the
dwIoControlCode
parameter specifies an operation that does not require input data.
•
nInBufferSize
(in) Size, in bytes, of the buffer pointed to by
lpInBuffer
.
•
lpOutBuffer
(out) Long pointer to a buffer that receives the operation’s output data.
This parameter can be NULL if the
dwIoControlCode
parameter
specifies an operation that does not produce output data.
•
nOutBufferSize
(in) Size, in bytes, of the buffer pointed to by
lpOutBuffer
.
•
lpBytesReturned
(out) Long pointer to a variable that receives the size, in bytes, of
the data stored into the buffer pointed to by
lpOutBuffer
. The
lpBytesReturned
parameter cannot be NULL. Even when an
operation produces no output data, and
lpOutBuffer
can be
NULL, DeviceIoControl makes use of the variable pointed to by
lpBytesReturned
. After such an operation, the variable value has
no meaning.
•
lpOverlapped
(in) Ignored; set to NULL.
•
Return Values
Nonzero indicates success. Zero indicates failure. To get extended
error information, call GetLastError.