DIOCParams
Contains
information that an application has passed to the virtual device driver (VxD)
by calling the DeviceIoControl function.
include vwin32.inc
DIOCParams STRUC
Internal1 DD
?
VMHandle DD ?
Internal2 DD
?
dwIoControlCode DD
?
lpvInBuffer DD
?
cbInBuffer DD
?
lpvOutBuffer DD
?
cbOutBuffer DD
?
lpcbBytesReturned DD
?
lpoOverlapped DD ?
hDevice DD ?
tagProcess DD
?
DIOCParams ENDS
Members
Internal1
Reserved.
VMHandle
Handle of
virtual machine.
Internal2
Reserved.
dwIoControlCode
Control code
to process. This member can be a developer-defined value or one of these
system-defined values:
|
DIOC_CLOSEHANDLE |
Notifies a
VxD that an application has closed its device handle for the VxD. The VxD
should perform cleanup operations and release any structures associated with
the application. |
|
DIOC_GETVERSION |
Queries the
VxD to determine if it supports the device IOCTL interface. If the VxD
supports the interface, it must clear the EAX register. Otherwise, it must
place a nonzero value in EAX. If cbOutBuffer is nonzero and the VxD
supports the interface, the VxD should copy version information to the lpvOutBuffer. |
lpvInBuffer
Address of a
buffer that contains data needed to process the control code.
cbInBuffer
Size, in
bytes, of the buffer pointed to by lpvInBuffer.
lpvOutBuffer
Address of a
buffer that receives the results of processing the control code.
cbOutBuffer
Size, in
bytes, of the buffer pointed to by lpvOutBuffer.
lpcbBytesReturned
Number of
bytes copied to the buffer pointed to by lpvOutBuffer.
lpoOverlapped
Address of an
OVERLAPPED
structure that contains information used to complete the command
asynchronously. If the command is to be completed synchronously, this member is
NULL.
hDevice
Handle of
device.
tagProcess
Information
that the VxD can use to tag the current request along with hDevice. When
the VxD receives a DIOC_CLOSEHANDLE control code for hDevice and tagProcess,
it should perform appropriate cleanup operations.