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ISpGrammarBuilder::ClearRule

ISpGrammarBuilder::ClearRule removes all of the grammar rule information except for the rule's initial state handle.

HRESULT ClearRule(
   SPSTATEHANDLE   hState
);

Parameters

hState

[in] Handle to the any of the states in the grammar rule to be cleared. Only the rule's initial state handle is still valid.

Return values

Example

The following code snippet illustrates the use of ClearRule.

    HRESULT hr = S_OK;

    SPSTATEHANDLE hInit;
    SPSTATEHANDLE hState;
    hr = pGrammarBuilder->GetRule(L"rule1", 1, 0, TRUE, &hInit);

    // ClearRule using hInitState
    hr = pGrammarBuilder->CreateNewState(hInit, &hState);
    hr = pGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
    hr = pGrammarBuilder->ClearRule(hInit);
    // Check hr

    hr = pGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
    // E_INVALIDARG because hState in no longer valid

    // ClearRule using hState != hInit
    hr = pGrammarBuilder->CreateNewState(hInit, &hState);
    hr = pGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
    hr = pGrammarBuilder->ClearRule(hState);
    // Check hr
	
    hr = pGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
    // E_INVALIDARG because hState in no longer valid