ISpRecoGrammar::SetTextSelection (Windows CE 5.0)

Article
09/14/2012

This method sets the current text selection and insertion point information. See also ISpRecoGrammar::SetWordSequenceData for information on how to set the text data. See also ISpSREngine::SetTextSelection for information on how SAPI passes the text selection info to the SR engine.

HRESULT SetTextSelection(const SPTEXTSELECTIONINFO* pInfo);

Parameters

pInfo
[in] Pointer to an SPTEXTSELECTIONINFO structure containing the text selection and insertion point information.

Return Values

The following table shows the possible return values.

Value	Description
S_OK	Function completed successfully.
E_INVALIDARG	One or more arguments are invalid.
FAILED(hr)	Appropriate error message.

Remarks

An application that has a text box might allow the user to speak commands into the text box to edit the text. One way to design this functionality is to create a CFG that supports such commands as "cut the text *", "bold the text *", or "italicize the words *". In this case, the grammar uses a TEXTBUFFER tag in place of the * to allow the SR engine to recognize the text buffer information. At run time, when the user highlights a selection of text and the text selection using SetTextSelection, the application updates the SR engine view of the text buffer using ISpRecoGrammar::SetWordSequenceData.

The application should change the active text selection when the text highlight changes, rather than the entire word sequence data. This ensures that the SR engine has a textual context to help the recognition language model.

Example

The following code snippet illustrates how to use this method after sending a text buffer to the SR engine.

HRESULT hr = S_OK;
// place the contents of text buffer into pwszCoMem and the length of the text
in cch
SPTEXTSELECTIONINFO tsi;
tsi.ulStartActiveOffset = 0;
tsi.cchActiveChars = cch;
tsi.ulStartSelection = 0;
tsi.cchSelection = cch;
pwszCoMem2 = (WCHAR *)CoTaskMemAlloc(sizeof(WCHAR) * (cch + 2));
if (SUCCEEDED(hr) && pwszCoMem2)
    {
    // SetWordSequenceData requires double NULL terminator.
    memcpy(pwszCoMem2, pwszCoMem, sizeof(WCHAR) * cch);
    pwszCoMem2[cch] = L'\0';
    pwszCoMem2[cch+1] = L'\0';
    // set the text buffer data
    hr = cpRecoGrammar->SetWordSequenceData(pwszCoMem2, cch + 2, NULL);
    // Check hr
    // set the text selection information
    hr = cpRecoGrammar->SetTextSelection(&tsi);
    // Check hr
    CoTaskMemFree(pwszCoMem2);
}
CoTaskMemFree(pwszCoMem);
// the SR engine is now capable of recognizing the contents of the text buffer

Requirements

OS Versions: Windows CE .NET 4.1 and later.
Header: Sapi.h, Sapi.idl.
Link Library: Sapilib.lib.

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