WinHidDevice.ReportDescriptorReconstructor.cs NotImplException - fix

null@example.com (martin.holden) — Thu, 11 Jul 2019 07:25:02 +0000

We have a number of devices that are throwing a NotImplementedException() in WinHidDevice.ReportDescriptorReconstructor.cs@171 [v2.1.0] during open. I propose the following code to mitigate the problem. Whether this fixes for all cases I cannot be sure but it seems to for us. I guess it shouldn't be a big deal if no-one else has previously reported this.

Thank you for your efforts.

else if (dataIndexCount == 1)
                        {
                            // Array...
                            int bitCount = reportItem.ReportCount * reportItem.ReportSize;
                            var usageValue = new byte[(bitCount + 7) / 8];
                            for (int i = 0; i < usageValue.Length; i++) { usageValue[i] = 0xff; }
                            int hr = NativeMethods.HidP_SetUsageValueArray(reportType, item.UsagePage, item.LinkCollection, item.UsageIndex, usageValue, (ushort)usageValue.Length, _preparsed, reportBytes, reportBytes.Length);
                            if (hr == NativeMethods.HIDP_STATUS_SUCCESS)
                            {
                                GetDataStartBit(reportBytes, reportItem, maxBit);
                            }
                            else if (hr == NativeMethods.HIDP_STATUS_NOT_VALUE_ARRAY) // +++[
                            {                                
                                hr = NativeMethods.HidP_SetUsageValue(reportType, item.UsagePage, item.LinkCollection, item.UsageIndex, 0xffffffff, _preparsed, reportBytes, reportBytes.Length);
                                if (hr == NativeMethods.HIDP_STATUS_SUCCESS)
                                {
                                    GetDataStartBit(reportBytes, reportItem, maxBit);
                                }
                                else // ]+++
                                {
                                    throw new NotImplementedException();
                                }
                            }
                        }
                        else
                        ...

You'll need to add the following two items to NativeMethods.cs as well:

public static readonly int HIDP_STATUS_NOT_VALUE_ARRAY = HIDP_ERROR_CODES(12, 11);

[DllImport("hid.dll", CharSet = CharSet.Auto)]
        public unsafe static extern int HidP_SetUsageValue(HIDP_REPORT_TYPE reportType, ushort usagePage, ushort linkCollection, ushort usage, uint usageValue, IntPtr preparsed, byte[] report, int reportLength);

James's Programming Page — WinHidDevice.ReportDescriptorReconstructor.cs NotImplException - fix

WinHidDevice.ReportDescriptorReconstructor.cs NotImplException - fix