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PENINFO
- 0 2.0
Contains dimensions, sampling rate, and other information about the pen or
tablet hardware.
typedef struct {
UINT cxRawWidth;
UINT cyRawHeight;
UINT wDistinctWidth;
UINT wDistinctHeight;
int nSamplingRate;
int nSamplingDist;
LONG lPdc;
int cPens;
int cbOemData;
OEMPENINFO rgoempeninfo[MAXOEMDATAWORDS];
UINT rgwReserved[7];
UINT fuOEM;
} PENINFO;
Members
cxRawWidth
Width of tablet in thousandths of an inch. Also specifies the maximum tablet
x-coordinate.
cyRawHeight
Height of tablet in thousandths of an inch. Also specifies the maximum tablet
y-coordinate.
wDistinctWidth
Number of distinct x-coordinates the hardware can detect.
wDistinctHeight
Number of distinct y-coordinates the hardware can detect. Together, the wDistinctWidth and wDistinctHeight members express the x-y resolution of the tablet. For example, if a tablet is
8 inches wide and has a resolution of 1/500 of an inch, cxRawWidth is 8000 and wDistinctWidth is 4000 because the tablet hardware can return 4000 distinct x-order values
ranging from 0 to 8000.
nSamplingRate
Specifies the number of samples per second the tablet can return. This value
may be less than the number of hardware interrupts per second the tablet
generates because several interrupts may be required to create one pen packet sample.
See the "Comments" section below for information on adjusting the sampling rate.
nSamplingDist
Specifies the distance in distinct tablet units a pen must travel before a new
pen event is generated. See the "Comments" section below for information on
adjusting the sampling distance.
lPdc
Pen-device capabilities, expressed as a bitwise-OR combination of the PDC_
flags.
cPens
Number of pens the tablet can simultaneously support.
cbOemData
Specifies the width, in bytes, of the additional OEM data passed in each pen
packet. For example, if a tablet can detect pressure and Z-angle information,
this information occupies two additional words of OEM data, so cbOemData is 4.
rgoempeninfo[MAXOEMDATAWORDS]
An array of OEMPENINFO structures. Each structure describes one word of additional OEM data
contained in each pen packet. (MAXOEMDATAWORDS is defined as 6.)
rgwReserved[7]
Reserved for internal use.
fuOEM
Flags representing which OEM data to report in rgoempeninfo; used by applications to determine the OEM data used in an HPENDATA object. This member is set and used internally by the pen services and should
never be modified by an application. This member is a bitwise-OR combination
of the following values:
Constant
| Description
| PHW_ALL
| Report all available OEM data.
| PHW_PRESSURE
| Report pressure if available.
| PHW_HEIGHT
| Report height if available.
| PHW_ANGLEXY
| Report Xy-angle if available.
| PHW_ANGLEZ
| Report Z-angle if available.
| PHW_BARRELROTATION
| Report barrel rotation if available.
| PHW_OEMSPECIFIC
| Report OEM-specific value if available.
| PHW_PDK
| Report per-point PDK_ values.
|
Comments
The DRV_GetPenInfo pen driver message fills a PENINFO structure with the current device parameters. DRV_GetPenInfo returns FALSE if
a tablet is not present. If this occurs, the PENINFO structure that the message's lParam1 points to is not valid. Note that an application should retrieve tablet
information with the GetPenDataInfo and GetPenDataAttributes functions, rather than accessing the pen driver directly.
An application can also adjust the tablet sampling rate and sampling distance
by sending the DRV_SetSamplingRate or DRV_SetSamplingDist messages to the
device driver. For more information, see Appendix E, "Accessing the Pen Device
Driver."
For a list of state bits for the pen driver, refer to the entry for PDK_
values in Chapter 13, "Pen Application Programming Interface Constants."
See Also
CreatePenDataEx, GetPenDataInfo, TrimPenData, UpdatePenInfo, OEMPENINFO
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