Gives a recognizer sufficient time for intermediate processing of pen input. A
recognizer must export this function.
int ProcessHRC( HRC hrc, DWORD dwTimeMax )
Handle to the HRC
object for the recognizer.
The maximum time in milliseconds that the recognizer should process before
returning from this call. This parameter can also be one of the following time-out
|The recognizer should take only a very small amount of time to process the
input, typically 50 milliseconds.
|The recognizer should take a moderate amount of time to process the input,
typically 200 milliseconds.
|The recognizer should take as much time as required to complete recognition.
If there are no errors, returns one of the following values:
|Processing is successful.
|The recognizer is still processing the current batch of input.
|The recognizer has recognized a possible gesture.
This can be returned before the recognition process
is complete. If the processing completes, HRCR_COMPLETE is always returned,
even for gestures.
|The recognizer completed processing and does not expect any more input.
To indicate an error, ProcessHRC
returns one of the following negative values:
|Invalid parameter or other error.
ProcessHRC returns if the time specified by dwTimeMax
elapses before recognition is complete.
In an operating environment that does not use threads, this function allows an
application to provide some time for the recognizer to process input. By
checking the return value, the application is able to monitor the progress,
specifically whether a gesture is a recognition candidate. If the function returns
HRCR_GESTURE, the application can call GetResultsHRC
to determine whether the gesture should be acted on immediately.
Typically, the return value is HRCR_OK if the current batch of ink input has
been processed by the recognizer, and HRCR_INCOMPLETE if the recognizer has not
yet finished processing.
is called with PH_MAX, recognition is complete only if EndPenInputHRC
has been called to notify the recognizer that no more results are expected.
The return value in this case is HRCR_COMPLETE, and the application is free to
get and display final results. If the application supplies further input at this
point, it has the effect of canceling the EndPenInputHRC
call, although this procedure is not recommended for reasons of efficiency.
However, PH_MAX may result in poorer performance, since further processing in
the system is blocked until ProcessHRC
returns. Instead, the application can call ProcessHRC
in an idle loop or a separate thread, calling it repeatedly with smaller time
allotments until the function returns HRCR_COMPLETE. Note that if a separate
thread is used to finish processing, the main thread can call this function with
PH_MIN from time to time to determine if processing has finished (that is,
checking for the HRCR_COMPLETE return value).
The first time that ProcessHRC
is called for a particular recognition context, functions that set its state
cannot be used for the remainder of that context's existence. The following
functions return an error if they are called before ProcessHRC
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