ISpGrammarBuilder::ClearRule (SAPI 5.4)

Microsoft Speech API 5.4

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.

  
// Declare local identifiers:
HRESULT                       hr = S_OK;
CComPtr<ISpGrammarBuilder>    cpGrammarBuilder;
SPSTATEHANDLE                 hInit;
SPSTATEHANDLE                 hState;

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

if (SUCCEEDED (hr))
{
  hr = cpGrammarBuilder->CreateNewState(hInit, &hState;);
}

if (SUCCEEDED (hr))
{
   hr = cpGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
}

if (SUCCEEDED (hr))
{
   // Call ClearRule using initial state.
   hr = cpGrammarBuilder->ClearRule(hInit);
}

if (SUCCEEDED (hr))
{
   hr = cpGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
}

if (FAILED (hr)) {}
{
   // Because hState is no longer valid.
   _ASSERT(hr == E_INVALIDARG);

   // Call ClearRule using hState != hInit.
   hr = cpGrammarBuilder->CreateNewState(hInit, &hState;);
}

if (SUCCEEDED (hr))
{
   hr = cpGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
}

if (SUCCEEDED (hr))
{
   hr = cpGrammarBuilder->ClearRule(hState);
}

if (SUCCEEDED (hr))
{
   hr = cpGrammarBuilder->AddWordTransition(hInit, hState, L"word", NULL, SPWT_LEXICAL, 1, NULL);
}

if (FAILED (hr))
{
   // Because hState is no longer valid.
   _ASSERT(hr == E_INVALIDARG);
}