/// <summary>
/// Invokes GetAlternateList in the native dll
/// </summary>
/// <returns></returns>
private GestureRecognitionResult[] InvokeGetAlternateList()
{
GestureRecognitionResult[] recResults = new GestureRecognitionResult[] { };
int hr = 0;
MS.Win32.Recognizer.RECO_RANGE recoRange;
recoRange.iwcBegin = 0;
recoRange.cCount = 1;
uint countOfAlternates = IRAS_DefaultCount;
IntPtr[] pRecoAlternates = new IntPtr[IRAS_DefaultCount];
try
{
hr = MS.Win32.Recognizer.UnsafeNativeMethods.GetAlternateList(_hContext, ref recoRange, ref countOfAlternates, pRecoAlternates, MS.Win32.Recognizer.ALT_BREAKS.ALT_BREAKS_SAME);
if (HRESULT.Succeeded(hr) && countOfAlternates != 0)
{
List <GestureRecognitionResult> resultList = new List <GestureRecognitionResult>();
for (int i = 0; i < countOfAlternates; i++)
{
uint size = 1; // length of string == 1 since gesture id is a single WCHAR
StringBuilder recoString = new StringBuilder(1);
RecognitionConfidence confidenceLevel;
if (HRESULT.Failed(MS.Win32.Recognizer.UnsafeNativeMethods.GetString(pRecoAlternates[i], out recoRange, ref size, recoString)) ||
HRESULT.Failed(MS.Win32.Recognizer.UnsafeNativeMethods.GetConfidenceLevel(pRecoAlternates[i], out recoRange, out confidenceLevel)))
{
// Fail to retrieve the reco result, skip this one
continue;
}
ApplicationGesture gesture = (ApplicationGesture)recoString[0];
Debug.Assert(ApplicationGestureHelper.IsDefined(gesture));
if (ApplicationGestureHelper.IsDefined(gesture))
{
resultList.Add(new GestureRecognitionResult(confidenceLevel, gesture));
}
}
recResults = resultList.ToArray();
}
}
finally
{
// Destroy the alternates
for (int i = 0; i < countOfAlternates; i++)
{
if (pRecoAlternates[i] != IntPtr.Zero)
{
#pragma warning suppress 6031, 56031 // Return value ignored on purpose.
MS.Win32.Recognizer.UnsafeNativeMethods.DestroyAlternate(pRecoAlternates[i]);
pRecoAlternates[i] = IntPtr.Zero;
}
}
}
return(recResults);
}
/// <summary>
/// Invokes GetLatticePtr in the native dll
/// </summary>
/// <returns></returns>
private GestureRecognitionResult[] InvokeGetLatticePtr()
{
GestureRecognitionResult[] recResults = new GestureRecognitionResult[] { };
// int hr = 0;
IntPtr ptr = IntPtr.Zero;
// NOTICE-2005/07/11-WAYNEZEN,
// There is no need to free the returned the structure.
// The memory will be released when ResetContext, which is invoked in the callee - Recognize, is called.
if (HRESULT.Succeeded(
MS.Win32.Recognizer.UnsafeNativeMethods.GetLatticePtr(
_hContext, ref ptr)))
{
unsafe
{
MS.Win32.Recognizer.RECO_LATTICE *pRecoLattice = (MS.Win32.Recognizer.RECO_LATTICE *)ptr;
uint bestResultColumnCount = pRecoLattice->ulBestResultColumnCount;
Debug.Assert(!(bestResultColumnCount != 0 && pRecoLattice->pLatticeColumns == IntPtr.Zero), "Invalid results!");
if (bestResultColumnCount > 0 && pRecoLattice->pLatticeColumns != IntPtr.Zero)
{
List <GestureRecognitionResult> resultList = new List <GestureRecognitionResult>();
MS.Win32.Recognizer.RECO_LATTICE_COLUMN *pLatticeColumns =
(MS.Win32.Recognizer.RECO_LATTICE_COLUMN *)(pRecoLattice->pLatticeColumns);
ulong *pulBestResultColumns = (ulong *)(pRecoLattice->pulBestResultColumns);
for (uint i = 0; i < bestResultColumnCount; i++)
{
ulong column = pulBestResultColumns[i];
MS.Win32.Recognizer.RECO_LATTICE_COLUMN recoColumn = pLatticeColumns[column];
Debug.Assert(0 < recoColumn.cLatticeElements, "Invalid results!");
for (int j = 0; j < recoColumn.cLatticeElements; j++)
{
MS.Win32.Recognizer.RECO_LATTICE_ELEMENT recoElement =
((MS.Win32.Recognizer.RECO_LATTICE_ELEMENT *)(recoColumn.pLatticeElements))[j];
Debug.Assert((RECO_TYPE)(recoElement.type) == RECO_TYPE.RECO_TYPE_WCHAR, "The Application gesture has to be WCHAR type");
if ((RECO_TYPE)(recoElement.type) == RECO_TYPE.RECO_TYPE_WCHAR)
{
// Retrieve the confidence lever
RecognitionConfidence confidenceLevel = RecognitionConfidence.Poor;
MS.Win32.Recognizer.RECO_LATTICE_PROPERTIES recoProperties = recoElement.epProp;
uint propertyCount = recoProperties.cProperties;
MS.Win32.Recognizer.RECO_LATTICE_PROPERTY **apProps =
(MS.Win32.Recognizer.RECO_LATTICE_PROPERTY * *)recoProperties.apProps;
for (int k = 0; k < propertyCount; k++)
{
MS.Win32.Recognizer.RECO_LATTICE_PROPERTY *pProps = apProps[k];
if (pProps->guidProperty == GUID_CONFIDENCELEVEL)
{
Debug.Assert(pProps->cbPropertyValue == sizeof(uint) / sizeof(byte));
RecognitionConfidence level = (RecognitionConfidence)(((uint *)pProps->pPropertyValue))[0];
if (level >= RecognitionConfidence.Strong && level <= RecognitionConfidence.Poor)
{
confidenceLevel = level;
}
break;
}
}
ApplicationGesture gesture = (ApplicationGesture)((char)(recoElement.pData));
Debug.Assert(ApplicationGestureHelper.IsDefined(gesture));
if (ApplicationGestureHelper.IsDefined(gesture))
{
// Get the gesture result
resultList.Add(new GestureRecognitionResult(confidenceLevel, gesture));
}
}
}
}
recResults = (GestureRecognitionResult[])(resultList.ToArray());
}
}
}
return(recResults);
}
internal static ApplicationGesture[] GetApplicationGestureArrayAndVerify(IEnumerable <ApplicationGesture> applicationGestures)
{
if (applicationGestures == null)
{
// Null is not allowed as the argument value
throw new ArgumentNullException("applicationGestures");
}
uint count = 0;
//we need to make a disconnected copy
ICollection <ApplicationGesture> collection = applicationGestures as ICollection <ApplicationGesture>;
if (collection != null)
{
count = (uint)collection.Count;
}
else
{
foreach (ApplicationGesture gesture in applicationGestures)
{
count++;
}
}
// Cannot be empty
if (count == 0)
{
// An empty array is not allowed.
throw new ArgumentException(SR.Get(SRID.ApplicationGestureArrayLengthIsZero), "applicationGestures");
}
bool foundAllGestures = false;
List <ApplicationGesture> gestures = new List <ApplicationGesture>();
foreach (ApplicationGesture gesture in applicationGestures)
{
if (!ApplicationGestureHelper.IsDefined(gesture))
{
throw new ArgumentException(SR.Get(SRID.ApplicationGestureIsInvalid), "applicationGestures");
}
//check for allgestures
if (gesture == ApplicationGesture.AllGestures)
{
foundAllGestures = true;
}
//check for dupes
if (gestures.Contains(gesture))
{
throw new ArgumentException(SR.Get(SRID.DuplicateApplicationGestureFound), "applicationGestures");
}
gestures.Add(gesture);
}
// AllGesture cannot be specified with other gestures
if (foundAllGestures && gestures.Count != 1)
{
// no dupes allowed
throw new ArgumentException(SR.Get(SRID.AllGesturesMustExistAlone), "applicationGestures");
}
return(gestures.ToArray());
}