Pen API Structures

The Pen API defines 31 structures in the following categories:

Structure category	Description
System and hardware	Information about the system and pen hardware.
Display	Structures that affect display.
Guides and controls	Structures that affect boxes, guides, and controls.
Recognition	Pertain to the process and results of recognition.
Pen data	Information about points and strokes.
Target	Pertain to target windows.
Time intervals	Stroke interval information.

The following tables list the structures of the Pen API by category. For structures new to version 2.0, the first member is cbSize, which contains the structure's size in bytes.

Important Before using a version 2.0 structure, an application must initialize its cbSize mem-ber with the value sizeof( structname ), where structname represents the name of the structure. For example:

INKINGINFO inkinginfo;

inkinginfo.cbSize = sizeof( INKINGINFO );

INKINGINFO inkinginfo = {sizeof( INKINGINFO )};

System and hardware structures	Description
CALBSTRUCT	Pen calibration information.
OEMPENINFO	Tablet hardware information provided by original equipment manufacturer.
PDEVENT	Provides information about the pen device associated with an IN_PDEVENT notification.
PENINFO	Pen or tablet hardware information.

Display structures	Description
ANIMATEINFO	Animation information used by the DrawPenDataEx function.
CWX	Specifies optional parameters for the CorrectWritingEx function. (Japanese version only.)
INKINGINFO	Specifies where and how to display ink.
PCMINFO	Specifies screen areas that affect pen data collection.
PENTIP	Width and color of ink trail left by pen.
RECTOFS	Offsets of inflated or deflated writing area.
SKBINFO	Information about on-screen keyboard.

Guide and control structures	Description
BOXEDITINFO	Size information for boxed edit control.
BOXLAYOUT	Layout of boxed edit control.
CTLINITBEDIT	Initialization for boxed edit control.
CTLINITHEDIT	Initialization for handwriting edit control.
CTLINITIEDIT	Initialization for ink edit control.
GUIDE	Characteristics of handwriting guides.

Recognition structures	Description
BOXRESULTS	Results returned from the GetBoxResultsHRC function.
RC	Various information about the recognition context used by version 1.0 recognition functions.
RCRESULT	Results of recognition initiated through a version 1.0 recognition function.
SYC	Symbol correspondence linking ink strokes with a particular recognized symbol.
SYE	Symbol element containing a recognized symbol and its confidence level.
SYG	Symbol graph containing SYC and SYE struc-tures that together specify all guesses a recog-nizer has made.

Pen data structures	Description
PENDATAHEADER	Header structure of an HPENDATA memory block.
PENPACKET	Data sent by pen driver to inform system of pen activity.
STRKFMT	Attributes of a stroke.
STROKEINFO	Information about points making up a single stroke.

Time interval structures	Description
ABSTIME	Time of a pen data point in seconds and milliseconds.
INTERVAL	Start and end times for a set of data points.

Target structures	Description
INPPARAMS	Describes a set of targets.
TARGET	Information about a single target window.
TARGINFO	Information about a set of targets.

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