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); } }