private void GetPhysicalMax(NativeMethods.RAWINPUT rawInput, IntPtr pPreparsedData)
{
short valueCapsLength = 1;
Point p = new Point();
HidNativeApi.HidP_Value_Caps[] hvc = new HidNativeApi.HidP_Value_Caps[valueCapsLength];
HidNativeApi.HidP_GetSpecificValueCaps(HidReportType.Input, NativeMethods.GenericDesktopPage, 1, NativeMethods.XCoordinateId, hvc, ref valueCapsLength, pPreparsedData);
p.X = hvc[0].PhysicalMax != 0 ? hvc[0].PhysicalMax : hvc[0].LogicalMax;
HidNativeApi.HidP_GetSpecificValueCaps(HidReportType.Input, NativeMethods.GenericDesktopPage, 1, NativeMethods.YCoordinateId, hvc, ref valueCapsLength, pPreparsedData);
p.Y = hvc[0].PhysicalMax != 0 ? hvc[0].PhysicalMax : hvc[0].LogicalMax;
_touchScreenPhysicalMax[rawInput.header.hDevice] = p;
}
/// <summary>
/// Processes WM_INPUT messages to retrieve information about any
/// touch events that occur.
/// </summary>
/// <param name="LParam">The WM_INPUT message to process.</param>
private void ProcessInputCommand(IntPtr LParam)
{
uint dwSize = 0;
// First call to GetRawInputData sets the value of dwSize
// dwSize can then be used to allocate the appropriate amount of memore,
// storing the pointer in "buffer".
NativeMethods.GetRawInputData(LParam, NativeMethods.RID_INPUT, IntPtr.Zero,
ref dwSize,
(uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTHEADER)));
IntPtr buffer = Marshal.AllocHGlobal((int)dwSize);
IntPtr pPreparsedData = IntPtr.Zero;
try
{
// Check that buffer points to something, and if so,
// call GetRawInputData again to fill the allocated memory
// with information about the input
if (buffer != IntPtr.Zero &&
NativeMethods.GetRawInputData(LParam, NativeMethods.RID_INPUT,
buffer,
ref dwSize,
(uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTHEADER))) == dwSize)
{
NativeMethods.RAWINPUT raw = (NativeMethods.RAWINPUT)Marshal.PtrToStructure(buffer, typeof(NativeMethods.RAWINPUT));
if (!_touchScreenPhysicalMax.ContainsKey(raw.header.hDevice))
{
return;
}
GetCurrentScreenOrientation();
uint pcbSize = 0;
NativeMethods.GetRawInputDeviceInfo(raw.header.hDevice, NativeMethods.RIDI_PREPARSEDDATA, IntPtr.Zero, ref pcbSize);
pPreparsedData = Marshal.AllocHGlobal((int)pcbSize);
NativeMethods.GetRawInputDeviceInfo(raw.header.hDevice, NativeMethods.RIDI_PREPARSEDDATA, pPreparsedData, ref pcbSize);
if (_touchScreenPhysicalMax[raw.header.hDevice].Equals(Point.Empty))
{
GetPhysicalMax(raw, pPreparsedData);
return;
}
int contactCount = 0;
IntPtr pRawData = new IntPtr(buffer.ToInt64() + (raw.header.dwSize - raw.hid.dwSizHid * raw.hid.dwCount));
HidNativeApi.HidP_GetUsageValue(HidReportType.Input, NativeMethods.TouchScreenUsagePage, 0, NativeMethods.ContactCountId,
ref contactCount, pPreparsedData, pRawData, raw.hid.dwSizHid);
int linkCount = 0;
HidNativeApi.HidP_GetLinkCollectionNodes(null, ref linkCount, pPreparsedData);
HidNativeApi.HIDP_LINK_COLLECTION_NODE[] lcn = new HidNativeApi.HIDP_LINK_COLLECTION_NODE[linkCount];
HidNativeApi.HidP_GetLinkCollectionNodes(lcn, ref linkCount, pPreparsedData);
if (contactCount != 0)
{
_requiringContactCount = contactCount;
_outputTouchs = new List <RawTouchData>(contactCount);
}
if (_requiringContactCount == 0)
{
return;
}
int contactIdentifier = 0;
int physicalX = 0;
int physicalY = 0;
int screenWidth = Screen.PrimaryScreen.Bounds.Width;
int screenHeight = Screen.PrimaryScreen.Bounds.Height;
for (int dwIndex = 0; dwIndex < raw.hid.dwCount; dwIndex++)
{
for (short nodeIndex = 1; nodeIndex <= lcn[0].NumberOfChildren; nodeIndex++)
{
IntPtr pRawDataPacket = new IntPtr(pRawData.ToInt64() + dwIndex * raw.hid.dwSizHid);
HidNativeApi.HidP_GetUsageValue(HidReportType.Input, NativeMethods.TouchScreenUsagePage, nodeIndex, NativeMethods.ContactIdentifierId, ref contactIdentifier, pPreparsedData, pRawDataPacket, raw.hid.dwSizHid);
HidNativeApi.HidP_GetScaledUsageValue(HidReportType.Input, NativeMethods.GenericDesktopPage, nodeIndex, NativeMethods.XCoordinateId, ref physicalX, pPreparsedData, pRawDataPacket, raw.hid.dwSizHid);
HidNativeApi.HidP_GetScaledUsageValue(HidReportType.Input, NativeMethods.GenericDesktopPage, nodeIndex, NativeMethods.YCoordinateId, ref physicalY, pPreparsedData, pRawDataPacket, raw.hid.dwSizHid);
int usageLength = 0;
HidNativeApi.HidP_GetUsages(HidReportType.Input, NativeMethods.TouchScreenUsagePage, nodeIndex, null, ref usageLength, pPreparsedData, pRawData, raw.hid.dwSizHid);
HidNativeApi.HIDP_DATA[] hd = new HidNativeApi.HIDP_DATA[usageLength];
HidNativeApi.HidP_GetUsages(HidReportType.Input, NativeMethods.TouchScreenUsagePage, nodeIndex, hd, ref usageLength, pPreparsedData, pRawData, raw.hid.dwSizHid);
int x, y;
if (_isAxisCorresponds)
{
x = physicalX * screenWidth / _touchScreenPhysicalMax[raw.header.hDevice].X;
y = physicalY * screenHeight / _touchScreenPhysicalMax[raw.header.hDevice].Y;
}
else
{
x = physicalY * screenWidth / _touchScreenPhysicalMax[raw.header.hDevice].Y;
y = physicalX * screenHeight / _touchScreenPhysicalMax[raw.header.hDevice].X;
}
x = _xAxisDirection ? x : screenWidth - x;
y = _yAxisDirection ? y : screenHeight - y;
bool tip = hd.Length != 0 && hd[0].DataIndex == NativeMethods.TipId;
_outputTouchs.Add(new RawTouchData(tip, contactIdentifier, new Point(x, y)));
if (--_requiringContactCount == 0)
{
break;
}
}
if (_requiringContactCount == 0)
{
break;
}
}
if (_requiringContactCount == 0 && PointsIntercepted != null)
{
PointsIntercepted(this, new RawPointsDataMessageEventArgs(_outputTouchs));
}
}
else
{
throw new ApplicationException("GetRawInputData does not return correct size !\n.");
}
}
finally
{
Marshal.FreeHGlobal(pPreparsedData);
Marshal.FreeHGlobal(buffer);
}
}
bool CopyRawInputToDataByteArray(IntPtr lParam)
{
int dwSize = 0;
int rawInputHeaderSize = Marshal.SizeOf(typeof(NativeMethods.RAWINPUTHEADER));
//If pData is NULL, the required size of the buffer is returned in *pcbSize.
NativeMethods.GetRawInputData(lParam, (uint)NativeMethods.RID.INPUT, IntPtr.Zero, ref dwSize, rawInputHeaderSize);
if (dwSize > rawInputDataBufferSize)
{
rawInputDataBufferSize = dwSize;
ReleaseRawInputPtr();
}
if (rawInputPtr == IntPtr.Zero)
{
// allocate unmanaged memory, must be released by Marshal.FreeHGlobal in ReleaseRawInputDataBuffer()
rawInputPtr = Marshal.AllocHGlobal((int)rawInputDataBufferSize);
if (rawInputPtr == IntPtr.Zero)
{
if (ApplicationCommonSettings.IsDebugging)
{
Debugger.Break();
}
return(false);
}
}
try
{
if (NativeMethods.GetRawInputData(lParam, (uint)NativeMethods.RID.INPUT, rawInputPtr, ref dwSize, rawInputHeaderSize) != dwSize)
{
if (ApplicationCommonSettings.IsDebugging)
{
Debugger.Break();
}
return(false);
}
rawInput = (NativeMethods.RAWINPUT)Marshal.PtrToStructure(rawInputPtr, typeof(NativeMethods.RAWINPUT));
//Debug.WriteLine("rawInput.header.hDevice: " + rawInput.header.hDevice);
latestRawInputKind = rawInput.header.dwType;
int offset = 0;
reportAsByteArrayActualLength = 0;
switch (latestRawInputKind)
{
case NativeMethods.RawInputHeaderType.Hid:
offset = Marshal.SizeOf(typeof(NativeMethods.RAWINPUTHEADER)) + Marshal.SizeOf(typeof(NativeMethods.RAWHID));
reportAsByteArrayActualLength = rawInput.hid.dwSizeHid;
break;
case NativeMethods.RawInputHeaderType.Mouse:
offset = Marshal.SizeOf(typeof(NativeMethods.RAWINPUTHEADER));
reportAsByteArrayActualLength = Marshal.SizeOf(typeof(NativeMethods.RAWMOUSE));
break;
case NativeMethods.RawInputHeaderType.Keyboard:
return(false);
break;
default:
return(false);
break;
}
if (reportAsByteArrayActualLength > 64)
{
return(false);
}
Marshal.Copy(rawInputPtr, bRawData, 0, offset + reportAsByteArrayActualLength);
Array.Copy(bRawData, offset, reportAsByteArray, 0, reportAsByteArrayActualLength);
return(true);
}
catch (Exception ex)
{
if (ApplicationCommonSettings.IsDebugging)
{
Debugger.Break();
}
Debug.WriteLine(ex.Message);
return(false);
}
}
