Exemple #1
0
        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;
        }
Exemple #2
0
        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;
        }
Exemple #3
0
        internal GestureRecognitionResult[] Recognize(StrokeCollection strokes)
        {
            if (_disposed)
            {
                throw new ObjectDisposedException("NativeRecognizer");
            }

            //
            // note that we validate this argument from GestureRecognizer 
            // but since this is marked TAS, we want to do it here as well
            //
            if (strokes == null)
            {
                throw new ArgumentNullException("strokes"); // Null is not allowed as the argument value
            }
            if (strokes.Count > 2)
            {
                throw new ArgumentException(SR.Get(SRID.StrokeCollectionCountTooBig), "strokes");
            }

            // Create an empty result.
            GestureRecognitionResult[] recResults = new GestureRecognitionResult[]{};

            if ( strokes.Count == 0 )
            {
                return recResults;
            }

            int hr = 0;

            try
            {
                // Reset the context
                hr = MS.Win32.Recognizer.UnsafeNativeMethods.ResetContext(_hContext);
                if (HRESULT.Failed(hr))
                {
                    //finally block will clean up and throw
                    return recResults;
                }

                // Add strokes
                hr = AddStrokes(_hContext, strokes);
                if (HRESULT.Failed(hr))
                {
                    //AddStrokes's finally block will clean up this finally block will throw
                    return recResults;
                }

                // recognize the ink
                bool bIncremental;
                hr = MS.Win32.Recognizer.UnsafeNativeMethods.Process(_hContext, out bIncremental);

                if (HRESULT.Succeeded(hr))
                {
                    if ( s_GetAlternateListExists )
                    {
                        recResults = InvokeGetAlternateList();
                    }
                    else
                    {
                        recResults = InvokeGetLatticePtr();
                    }
                }
            }
            finally
            {
                // Check if we should report any error.
                if ( HRESULT.Failed(hr) )
                {
                    //don't throw a com exception here, we don't need to pass out any details
                    throw new InvalidOperationException(SR.Get(SRID.UnspecifiedGestureException));
                }
            }

            return recResults;
        }