Recognition Functions

The following sections provide fragmentary examples of the recognition functions AddPenInputHRC, CreateCompatibleHRC, CreateInksetHRCRESULT, CreatePenDataHRC, and DestroyHRC.

For purposes of discussion, the examples assume the recognizer's HRC takes the form of a private structure called HRCinternal. This structure contains a handle to an HPENDATA block, which stores the stroke information and pen data points for an input session. (For a description of HPENDATA, see "The HPENDATA Object" in Chapter 4.) The HRC applies only to a single session say, a word written by the user. The client application must create a new HRC to recognize the next word.

The following typedef statement defines the hypothetical HRC object used by the example code fragments in this section:

typedef struct

{

DWORD reserved; // Reserve first DWORD for system

HGLOBAL hglobal; // Handle from GlobalAlloc

HPENDATA hpendata; // HPENDATA handle for input

int wPdk; // Current stroke is pen-up or down

// Other information for the HRC

.

.

} HRCinternal, FAR *LPHRCinternal;

Notice that the structure reserves the first DWORD for system use. This is required for all recognizer objects. The structure also groups pertinent variables within the object itself instead of allocating them as global data. This ensures that the object remains private to the client that creates it.

In the code that follows, all internal functions have an "N" prefix. This helps distinguish them from standard API functions.

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