PeekPenInput
- 0
Retrieves information about a specified pen packet in the pen input queue. For
a definition of pen packet, see the description of
SetPenHook.
int PeekPenInput( HPCM hpcm, UINT idEvent, LPPOINT lppt, LPVOID lpvOem, UINT fuOemFlags )
Parameters
hpcm
Handle to a pen collection. This is the return value from
StartPenInput.
idEvent
The identifier of the packet to be retrieved. The
idEvent is the low-order word of the value returned from the Windows
GetMessageExtraInfo function when processing a WM_LBUTTONDOWN message.
lppt
Far pointer to a
POINT structure.
PeekPenInput copies the point corresponding to
idEvent into the buffer pointed to by
lppt.
lpvOem
The address of a buffer of OEM data in the packet. This parameter can be NULL
if no OEM data is required.
fuOemFlags
Flags specifying which OEM data to retrieve. If this parameter is NULL, all of
the OEM data provided by the tablet is returned in the order specified by the
rgoempeninfo array in
PENINFO.
These flags have an implicit order. For example, if pressure and barrel
rotation are specified in that order,
cPntMax pairs of these data are returned in the same order: [pressure, rotation],
[pressure, rotation], and so on. (
cPntMax is the number of
POINT structures specified in
GetPenInput.)
Constant
| Description
|
PHW_PRESSURE
| Retrieve pressure data.
|
PHW_HEIGHT
| Retrieve height data.
|
PHW_ANGLEXY
| Retrieve data pertaining to the x- and y-coordinates.
|
PHW_ANGLEZ
| Retrieve data pertaining to the z-coordinates.
|
PHW_BARRELROTATION
| Retrieve barrel-rotation data.
|
PHW_OEMSPECIFIC
| Retrieve OEM-specific data.
|
PHW_PDK
| Retrieve PDK_ data.
|
Return Value
Returns PCMR_OK if successful; otherwise, the return value can be one of the
following:
Constant
| Description
|
PCMR_INVALIDCOLLECTION
| The hpcm handle is invalid because the calling application did not start input with StartPenInput.
|
PCMR_INVALID_PACKETID
| idEvent is invalid.
|
Comments
Unlike
GetPenInput, this function does not remove data from the pen input queue. It only returns
information about the packet specified by
idEvent.
Whereas
lppt points into the pen input queue,
lpvOem does not. If
lpvOem is not NULL, it points to a buffer provided by the caller into which the OEM
data are copied from the pen input queue.
The buffer that
lpvOem points to must be large enough to hold the requested OEM data copied from the
packet. The size of each packet is the width specified in the
cbOemData member of the
PENINFO structure, plus sizeof( UINT ) if PDK_ values are required.
See Also
GetPenInput,
PENPACKET, PDK_
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