Boxed Recognition - Microsoft Windows Pen API Programmer's Reference

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Boxed Recognition

retrieves boxed recognition results on a box-by-box basis. The function fills an array of BOXRESULTS structures with the results and alternatives for a set of boxed character positions in the recognized text. Each of the BOXRESULTS structure in the array contains one or more recognition guesses for a single box.

For example, consider the case in which the user has written a seven-letter word before requesting recognition

say, by tapping an OK button. The application can retrieve results individually for each box by calling GetBoxResultsHRC in a loop, or provide an array of at least seven BOXRESULTS structures and receive all seven recognition results with a single call to GetBoxResultsHRC.

The following example code retrieves recognition results two boxes at a time. It requests only the first alternative for each box, which represents the recognizer's best guess about the character in the box:

#define NBOX 2 // Number of boxes to get

#define NALT 1 // Only one alternative per box

BOXRESULTS box[NBOX]; // Array of BOXRESULTS structures

UINT iSyv = 0; // Index of symbol values

int cBox; // Number of results returned

do {

cBox = GetBoxResultsHRC( hrc1, NALT, iSyv, NBOX,

(LPBOXRESULTS)&box, FALSE );

. // Do error checking

. // Read results from

. // box[] array

iSyv += (UINT) cBox; // Increment index

} while (cBox == NBOX) // Loop for next boxes

By requesting only a single alternative for a small number of boxes, the preceding example can allocate the array on the stack. However, the BOXRESULTS structure contains a variable-length array of type SYV for additional alternative characters. For a value of NALT greater than 1, the application must allocate extra space for the alternatives in each BOXRESULTS, as the following line demonstrates:

HGLOBAL hMem = GlobalAlloc( GHND,

NBOX*( sizeof(BOXRESULTS) + (NALT-1)*sizeof(SYV)) );

The example provided in the GetBoxResultsHRC reference section in Chapter 10 further illustrates how to use this function.

When GetBoxResultsHRC returns, the application can walk the BOXRESULTS array and display the information appropriately. The boxed edit control described in the "The bedit Control" section in Chapter 3 uses GetBoxResultsHRC to perform recognition and to generate alternative results.

Boxed writing does not constrain an application to call GetBoxResultsHRC for recognition results. An application can also call GetResultsHRC, described next, even if the HRC is configured for box guides.

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