Main Header
A
PENDATAHEADER structure is the first part of the main header of the
HPENDATA object. The
PENDATAHEADER structure, described in Chapter 11, "Pen Application Programming Interface
Structures," contains the following information:
- Number of strokes
- Total number of points
- Number of points in longest stroke
- Size in bytes of the memory block
- Bounding rectangle of all pen-down points
- Ink color
- Ink width
- Version
The
wPndts member of the
PENDATAHEADER structure describes the state of the data in the
HPENDATA object. The state of the data reflects whether the data is compressed,
includes pen-up points, or includes OEM data. The
wPndts element is a bitwise-OR combination of the PDTS_ flags described in Chapter
13, "Pen Application Programming Interface Constants."
The next component in the main header is a
PENINFO structure. The
PENINFO structure contains information about the tablet device that produced the
data. This information includes the tablet width, height, resolution, report rate,
proximity capabilities, and barrel-button status. For more information about
the
PENINFO structure, see Chapter 11, "Pen Application Programming Interface Structures."
The
cbOemData member of the
PENINFO structure specifies how much (if any) OEM pen data each pen packet contains.
The format and order of the extra OEM information are contained in the
rgboempeninfo member, which is an array of
OEMPENINFO structures. The
OEMPENINFO structures describe the order, minimum value, and scale of any OEM pen data
the tablet reports along with the coordinate data. Chapter 11 describes the
OEMPENINFO structure in detail.
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