private Collection <RecognizedPhrase> ExtractAlternates(int numberOfAlternates, bool isSapi53Header)
{
Collection <RecognizedPhrase> alternates = new();
if (numberOfAlternates > 0)
{
GCHandle gc = GCHandle.Alloc(_sapiAlternatesBlob, GCHandleType.Pinned);
try
{
IntPtr buffer = gc.AddrOfPinnedObject();
int sizeOfSpSerializedPhraseAlt = Marshal.SizeOf <SPSERIALIZEDPHRASEALT>();
int offset = 0;
for (int i = 0; i < numberOfAlternates; i++)
{
IntPtr altBuffer = new((long)buffer + offset);
SPSERIALIZEDPHRASEALT alt = Marshal.PtrToStructure <SPSERIALIZEDPHRASEALT>(altBuffer);
offset += sizeOfSpSerializedPhraseAlt; // advance over SPSERIALIZEDPHRASEALT
if (isSapi53Header)
{
offset += (int)((alt.cbAltExtra + 7) & ~7); // advance over extra data with alignment padding
}
else
{
offset += (int)alt.cbAltExtra; // no alignment padding
}
// we cannot use a constructor parameter because RecognitionResult also derives from RecognizedPhrase
IntPtr phraseBuffer = new((long)buffer + offset);
SPSERIALIZEDPHRASE serializedPhrase = RecognizedPhrase.GetPhraseHeader(phraseBuffer, _header.ulPhraseAltDataSize - (uint)offset, _isSapi53Header);
int serializedPhraseSize = (int)serializedPhrase.ulSerializedSize;
RecognizedPhrase phrase = new();
// Get the alphabet of the raw phrase alternate, which should be the same as the engine
bool hasIPAPronunciation = (_header.fAlphabet & (uint)SPRESULTALPHABET.SPRA_ENGINE_UPS) != 0;
phrase.InitializeFromSerializedBuffer(this, serializedPhrase, phraseBuffer, serializedPhraseSize, isSapi53Header, hasIPAPronunciation);
if (isSapi53Header)
{
offset += ((serializedPhraseSize + 7) & ~7); // advance over phrase with alignment padding
}
else
{
offset += serializedPhraseSize; // advance over phrase
}
alternates.Add(phrase);
}
}
finally
{
gc.Free();
}
}
return(alternates);
}
private Collection <RecognizedPhrase> ExtractAlternates(int numberOfAlternates, bool isSapi53Header)
{
Collection <RecognizedPhrase> collection = new Collection <RecognizedPhrase>();
if (numberOfAlternates > 0)
{
GCHandle gCHandle = GCHandle.Alloc(_sapiAlternatesBlob, GCHandleType.Pinned);
try
{
IntPtr value = gCHandle.AddrOfPinnedObject();
int num = Marshal.SizeOf(typeof(SPSERIALIZEDPHRASEALT));
int num2 = 0;
for (int i = 0; i < numberOfAlternates; i++)
{
IntPtr ptr = new IntPtr((long)value + num2);
SPSERIALIZEDPHRASEALT sPSERIALIZEDPHRASEALT = (SPSERIALIZEDPHRASEALT)Marshal.PtrToStructure(ptr, typeof(SPSERIALIZEDPHRASEALT));
num2 += num;
num2 = ((!isSapi53Header) ? (num2 + (int)sPSERIALIZEDPHRASEALT.cbAltExtra) : (num2 + (int)((sPSERIALIZEDPHRASEALT.cbAltExtra + 7) & -8)));
IntPtr phraseBuffer = new IntPtr((long)value + num2);
SPSERIALIZEDPHRASE phraseHeader = RecognizedPhrase.GetPhraseHeader(phraseBuffer, (uint)((int)_header.ulPhraseAltDataSize - num2), _isSapi53Header);
int ulSerializedSize = (int)phraseHeader.ulSerializedSize;
RecognizedPhrase recognizedPhrase = new RecognizedPhrase();
bool hasIPAPronunciation = (_header.fAlphabet & 2) != 0;
recognizedPhrase.InitializeFromSerializedBuffer(this, phraseHeader, phraseBuffer, ulSerializedSize, isSapi53Header, hasIPAPronunciation);
num2 = ((!isSapi53Header) ? (num2 + ulSerializedSize) : (num2 + ((ulSerializedSize + 7) & -8)));
collection.Add(recognizedPhrase);
}
return(collection);
}
finally
{
gCHandle.Free();
}
}
return(collection);
}