/// <summary>
/// Set the enabled gestures.
/// This method is called from the internal SetEnabledGestures method.
/// </summary>
private int SetEnabledGestures(MS.Win32.Recognizer.ContextSafeHandle recContext, ApplicationGesture[] enabledGestures)
{
Debug.Assert(recContext != null && !recContext.IsInvalid);
// NOTICE-2005/01/11-WAYNEZEN,
// The following usage was copied from drivers\tablet\recognition\ink\core\twister\src\wispapis.c
// SetEnabledUnicodeRanges
// Set ranges of gestures enabled in this recognition context
// The behavior of this function is the following:
// (a) (A part of) One of the requested ranges lies outside
// gesture interval---currently [GESTURE_NULL, GESTURE_NULL + 255)
// return E_UNEXPECTED and keep the previously set ranges
// (b) All requested ranges are within the gesture interval but
// some of them are not supported:
// return S_TRUNCATED and set those requested gestures that are
// supported (possibly an empty set)
// (c) All requested gestures are supported
// return S_OK and set all requested gestures.
// Note: An easy way to set all supported gestures as enabled is to use
// SetEnabledUnicodeRanges() with one range=(GESTURE_NULL,255).
// Enabel gestures
uint cRanges = (uint)(enabledGestures.Length);
MS.Win32.Recognizer.CHARACTER_RANGE[] charRanges = new MS.Win32.Recognizer.CHARACTER_RANGE[cRanges];
if (cRanges == 1 && enabledGestures[0] == ApplicationGesture.AllGestures)
{
charRanges[0].cChars = MAX_GESTURE_COUNT;
charRanges[0].wcLow = GESTURE_NULL;
}
else
{
for (int i = 0; i < cRanges; i++)
{
charRanges[i].cChars = 1;
charRanges[i].wcLow = (ushort)(enabledGestures[i]);
}
}
int hr = MS.Win32.Recognizer.UnsafeNativeMethods.SetEnabledUnicodeRanges(recContext, cRanges, charRanges);
return(hr);
}
private int AddStrokes(MS.Win32.Recognizer.ContextSafeHandle recContext, StrokeCollection strokes)
{
Debug.Assert(recContext != null && !recContext.IsInvalid);
int hr;
foreach ( Stroke stroke in strokes )
{
MS.Win32.Recognizer.PACKET_DESCRIPTION packetDescription =
new MS.Win32.Recognizer.PACKET_DESCRIPTION();
IntPtr packets = IntPtr.Zero;
try
{
int countOfBytes;
NativeMethods.XFORM xForm;
GetPacketData(stroke, out packetDescription, out countOfBytes, out packets, out xForm);
if (packets == IntPtr.Zero)
{
return -2147483640; //E_FAIL - 0x80000008. We never raise this in an exception
}
hr = MS.Win32.Recognizer.UnsafeNativeMethods.AddStroke(recContext, ref packetDescription, (uint)countOfBytes, packets, xForm);
if ( HRESULT.Failed(hr) )
{
// Return from here. The finally block will free the memory and report the error properly.
return hr;
}
}
finally
{
// Release the resources in the finally block
ReleaseResourcesinPacketDescription(packetDescription, packets);
}
}
return MS.Win32.Recognizer.UnsafeNativeMethods.EndInkInput(recContext);
}
