List of Pen API Functions

The following tables list by category all functions in version 2.0 of the Pen API. Functions appear in alphabetical order within each category, together with a brief description.

System and hardware functions	Description
GetPenAsyncState	Gets state of pen barrel button.
GetPenMiscInfo	Gets current system settings.
GetVersionPenWin	Gets the Pen API version number.
SetPenMiscInfo	Sets system defaults and assumptions.
UpdatePenInfo	Called by the pen driver to notify the system of a change in the driver configuration.

Display functions	Description
CreatePenDataRegion	Returns a screen region that contains the points of an HPENDATA object.
DrawPenDataEx	Enhanced version of DrawPenData.
DrawPenDataFmt	Default version of DrawPenDataEx.
RedisplayPenData	Displays collected pen data exactly as originally drawn.
ShowKeyboard	Displays or hides the on-screen keyboard.
StartInking	Begins the process of leaving a visible ink trail as the pen moves. See the descriptions of StartPenInput and DoDefaultPenInput.
StopInking	Stops the inking process begun by a call to StartInking.

Pen data functions	Description
AddPenDataHRC	Adds an HPENDATA object to an HRC.
AddPointsPenData	Adds new points and original equipment manufacturer (OEM) data to an existing HPENDATA object.
CreatePenData	Allocates memory for a new HPENDATA object and initializes its header.
CreatePenDataEx	Enhanced version of CreatePenData.
CreatePenDataHRC	Returns handle to HPENDATA object associated with an HRC.
DestroyPenData	Frees memory occupied by an HPENDATA memory block.
DuplicatePenData	Clones an existing HPENDATA object.
ExtractPenDataPoints	Copies or removes points from a stroke.
ExtractPenDataStrokes	Copies or removes selected strokes, optionally creating a new HPENDATA object from the copied strokes.
GetPenDataAttributes	Retrieves information about an HPENDATA object.
GetPenDataInfo	Gets status information for an HPENDATA object.
GetPointsFromPenData	Returns an array of points from an HPENDATA object.
GetStrokeAttributes	Retrieves information about a stroke.
GetStrokeTableAttributes	Retrieves information about a stroke's class. The class is an entry in a table stored in the PENDATAHEADER structure.
InsertPenData	Combines two HPENDATA blocks.
InsertPenDataPoints	Inserts points into a stroke in an HPENDATA object.
InsertPenDataStroke	Inserts data for a new stroke into an existing HPENDATA object.
OffsetPenData	Offsets pen data points by a specified amount.
PenDataFromBuffer	Reverse of PenDataToBuffer, which must be called first. Creates an HPENDATA block and writes the buffer back into it.
PenDataToBuffer	Serializes the contents of an HPENDATA block to a buffer.
RemovePenDataStrokes	Removes specified strokes from an HPENDATA object.
ResizePenData	Scales ink data to fit a specified rectangle.
SetStrokeAttributes	Sets attributes of a stroke. Reverse of GetStrokeAttributes.
SetStrokeTableAttributes	Sets attributes for a stroke's class. Reverse of GetStrokeTableAttributes.

Recognition functions	Description
AddPenInputHRC	Adds raw pen input to an HRC object.
AddWordsHWL	Adds words to a word list.
ConfigRecognizer	System access to recognizer configuration. Applications should not call this function.
CreateCompatibleHRC	Creates an empty HRC object.
CreateHWL	Creates a word list.
DestroyHRC	Destroys a recognizer's recognition context object.
DestroyHRCRESULT	Destroys a recognizer's results object.
DestroyHWL	Destroys the word list handle created by CreateHWL and frees its memory.
EnableGestureSetHRC	Enables or disables recognition of specified gestures.
EnableSystemDictionaryHRC	Specifies whether a recognizer should use its dictionary.
EndPenInputHRC	Informs a recognizer that the input session has ended.
GetAlphabetHRC	Retrieves the current alphabet from a recognizer.
GetAlphabetPriorityHRC	Retrieves the current alphabet priority from a recognizer.
GetAlternateWordsHRCRESULT	Gets alternative guesses made by a recognizer.
GetBoxMappingHRCRESULT	Retrieves from a recognizer the locations of a range of symbols in boxes.
GetBoxResultsHRC	Gets recognition results for a range of boxes.
GetGuideHRC	Gets a copy of the GUIDE structure (if any) in an HRC object.
GetHotspotsHRCRESULT	Returns the hot spots for a specified gesture.
GetHRECFromHRC	Gets module handle of recognizer from an HRC.
GetMaxResultsHRC	Gets the maximum number of guesses a recognizer can make.
GetResultsHRC	Retrieves an HRCRESULT object from recognizer containing recognition results.
GetWordlistCoercionHRC	Gets the current degree of influence a word list or dictionary has on recognition confidence levels.
GetWordlistHRC	Gets a word list from an HRC object.
InstallRecognizer	Loads a specified recognizer.
ProcessHRC	Tells recognizer to process input for a given period of time.
ReadHWL	Reads a word list from a file.
SetAlphabetHRC	Specifies the alphabet for a recognition session.
SetAlphabetPriorityHRC	Specifies alphabet priority for a session.
SetBoxAlphabetHRC	Specifies the alphabet for a range of boxes.
SetGuideHRC	Specifies guides for an HRC.
SetMaxResultsHRC	Sets the maximum number of guesses a recognizer can make.
SetWordlistCoercionHRC	Sets the degree of influence a word list or dictionary has on recognition confidence levels.
SetWordlistHRC	Identifies a word list for an HRC object.
TrainHREC	Passes ink and correct interpretations to recognizer for training.
UninstallRecognizer	Unloads a specified recognizer.
WriteHWL	Writes a word list to a file.

Symbol manipulation functions	Description
CharacterToSymbol	Converts an ANSI string to an array of symbol values.
EnumSymbols	Enumerates symbol strings in a symbol graph.
FirstSymbolFromGraph	Returns the array of symbols that is the most likely interpretation of a specific symbol graph.
GetSymbolCount	Returns the number of symbol strings contained in the symbol graph.
GetSymbolCountHRCRESULT	Gets the number of symbol values in results.
GetSymbolMaxLength	Gets the length of the longest symbol string contained in the symbol graph.
GetSymbolsHRCRESULT	Gets symbol values of recognition results.
SymbolToCharacter	Converts an array of symbols to an ANSI string.

Time interval functions	Description
AddInksetInterval	Adds an INTERVAL structure to an existing HINKSET object.
CreateInkset	Creates an empty inkset into which intervals can be added with the AddInksetInterval function.
CreateInksetHRCRESULT	Retrieves the intervals for a specified series of symbols returned by the recognizer.
DestroyInkset	Frees memory occupied by an inkset and invalidates the HINKSET handle.
GetInksetInterval	Copies a series of intervals from an HINKSET object to an array of INTERVAL structures.
GetInksetIntervalCount	Returns the number of intervals in an HINKSET object.

Compression functions	Description
CompressPenData	Compresses and uncompresses data.
DPtoTP	Converts display coordinates to tablet coordinates.
MetricScalePenData	Converts pen data points to one of the supported metric modes.
TPtoDP	Converts tablet coordinates to display coordinates.
TrimPenData	Removes selected data from an HPENDATA block.

Utility functions	Description
AtomicVirtualEvent	Blocks out physical pen events while posting virtual events.
BoundingRectFromPoints	Returns the bounding rectangle of an array of points.
ConfigHREC	Configures or queries recognizer options.
CorrectWriting	Displays lens or Correct Text dialog box to allow user to correct text.
CorrectWritingEx	Sends text to the CorrectText dialog box to allow the user to edit text using the Japanese Data Input Window. (Japanese version only.)
DoDefaultPenInput	Runs high-level recognition/data collection. Internally calls StartPenInput, StartInking, StopPenInput, and StopInking.
GetPenAppFlags	Returns the task flags created by SetPenAppFlags.
GetPenInput	Collects input data as the user writes.
GetPenResource	Retrieves a copy of the pen services resource. (Japanese version only.)
HitTestPenData	Determines whether a given point lies near a stroke.
IsPenEvent	Determines whether a WM_LBUTTONDOWN message is generated by a mouse or pen device.
KKConvert	(Japanese version only.) Activates the Kana-to-Kanji converter.
PeekPenInput	Retrieves information about a pen packet in the pen input queue. This function is similar to GetPenInput, but does not remove the pen packet from the queue.
PostVirtualKeyEvent	Simulates a keystroke by sending a virtual key code to Windows.
PostVirtualMouseEvent	Simulates mouse activity by sending a virtual mouse event to Windows.
SetPenAppFlags	Sets pen flags for the application that are used globally by the pen services.
StartPenInput	Begins collecting into an internal buffer ink data generated by the moving pen. See also the descriptions of . DoDefaultPenInput and StartInking.
StopPenInput	Ends collection process begun by a call to StartPenInput.
TargetPoints	Determines the logical recipient of data among several targets.

Hook functions	Description
SetPenHook	Sets or removes a hook for capturing low-level pen events.
SetResultsHookHREC	Sets a hook for recognition results.
UnhookResultsHookHREC	Unhooks a hook set by SetResultsHookHREC.

Obsolete functions	Description
BeginEnumStrokes	Locks an HPENDATA memory block in global memory in preparation for reading.
CloseRecognizer	Called by the system when uninstalling a recognizer. Subfunction has been superseded by WCR_CLOSERECOGNIZER in ConfigRecognizer.
CompactPenData	Data compression function superseded by CompressPenData and TrimPenData.
DictionarySearch	Searches dictionary for a word or phrase.
DrawPenData	Displays ink according to a display context HDC. Superseded by DrawPenDataEx.
EmulatePen	Emulates a pen system.
EndEnumStrokes	Unlocks an HPENDATA memory block. Required after calling BeginEnumStrokes.
GetGlobalRC	Retrieves a copy of the current system RC structure.
GetPenDataStroke	Gets the raw data for a stroke stored in an HPENDATA memory block.
GetPenHwEventData	Retrieves a range of pen event data from the internal pen data buffer.
InitRC	Initializes recognition context for the recognizer. Only for compatibility with version 1.0.
InitRecognizer	Called by the system when it installs a recognizer. Superseded by WCR_INITRECOGNIZER subfunction in ConfigRecognizer.
IsPenAware	Checks application's capability to handle pen events. Superseded by GetPenAppFlags.
ProcessWriting	Runs high-level recognition services. Superseded by DoDefaultPenInput.
Recognize	Begins recognition for a version 1.0 recognizer.
RecognizeData	Delayed recognition for a version 1.0 recognizer.
RegisterPenApp	Identifies an application to the system as pen-aware. Superseded by SetPenAppFlags.
SetGlobalRC	Sets default settings for the specified recognition context. This function should be called only from the pen Control Panel program.
SetRecogHook	Installs and removes a recognition hook in version 1.0. Superseded by SetResultsHookHREC.
TrainContext	Passes to the recognizer a previous recognition result that may contain errors along with the required interpretation.
TrainContextInternal	Called by system when an application calls TrainContext.
TrainInk	Informs the recognizer at the DLL recognition level that the raw data input represents the symbol value results.
TrainInkInternal	Called by system when an application calls TrainInk.

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