ISpRecoResult::Serialize

ISpRecoResult::Serialize creates a serialized copy of the recognition result object. The serialized copy can be saved and later restored using ISpRecoContext::DeserializeResult.

HRESULT Serialize(
   SPSERIALIZEDRESULT   **ppCoMemSerializedResult
);

Parameters

ppCoMemSerializedResult

[out] Address of a pointer to the SPSERIALIZEDRESULT structure that receives the serialized result information. Call CoTaskMemFree() to free the memory associated with the serialized result object.

Return values

Example

The following code snippet illustrates the use ISpRecoResult::Serialize to serialize a result and deserialize it back into an ISpRecoContext object.

// Declare local identifiers:
HRESULT                    hr = S_OK;
CComPtr<ISpRecoResult>     cpRecoResult;
CComPtr<ISpRecoResult>     cpRecoResultNew;
CComPtr<IStream>           cpStreamWithResult;
CComPtr<ISpRecoContext>    cpRecoContext;
SPSERIALIZEDRESULT*        pSerializedResult = NULL;
ULONG                      cbWritten = 0;
ULONG                      ulSerializedSize = 0;
LARGE_INTEGER              liseek;
LARGE_INTEGER              li;

// ... Obtain a recognition result object from the recognizer ...
hr = CreateStreamOnHGlobal(NULL, true, &cpStreamWithResult;);

if (SUCCEEDED(hr))
{
   // Serialize result to memory.
   hr = cpRecoResult->Serialize(&pSerializedResult;);
}

if (SUCCEEDED(hr))
{
   // Serialize to a stream pointer.
   hr = cpStreamWithResult->Write(pSerializedResult, pSerializedResult->ulSerializedSize, &cbWritten;);
}

if (SUCCEEDED(hr))
{
   // Free the serialized result.
   if (pSerializedResult) ::CoTaskMemFree(pSerializedResult);

   // Commit the stream changes.
   hr = cpStreamWithResult->Commit(STGC_DEFAULT);
}

if (SUCCEEDED(hr))
{
   // ... Persist stream to disk, network share, etc ...
   // ... Shutdown application ...
   // ... Restart application and get the persisted stream ...

   // Reset the stream seek pointer to the start before deserialization:
   li.QuadPart = 0;
   hr = cpStreamWithResult->Seek(li, STREAM_SEEK_SET, NULL);
}

if (SUCCEEDED(hr))
{
   // Find the size of the stream.
   hr = cpStreamWithResult->Read(&ulSerializedSize;, sizeof(ULONG), NULL);
}

if (SUCCEEDED(hr))
{
   // Reset the seek pointer:
   liseek.QuadPart = 0 - sizeof(ULONG);
   hr = cpStreamWithResult->Seek(liseek, STREAM_SEEK_CUR, NULL);
}

if (SUCCEEDED(hr))
{
   // Allocate the memory for the result.
   pSerializedResult = (SPSERIALIZEDRESULT*)::CoTaskMemAlloc(ulSerializedSize);

   // Check pSerializedResult in case out "out-of-memory".

   // Copy the stream into a serialized result object.
   hr = cpStreamWithResult->Read(pSerializedResult, ulSerializedSize, NULL);
}

if (SUCCEEDED(hr))
{
   // Deserialize result from memory.
   hr = cpRecoContext->DeserializeResult(pSerializedResult, &cpRecoResultNew;);
}

if (SUCCEEDED(hr))
{
   // Free the pSerializedResult memory.
   if (pSerializedResult) CoTaskMemFree(pSerializedResult);
}

// As long as the same engine was used to generate original
// result object, as is now being used, applications can
// now get alternates for the cpRecoResultNew's phrase.