public bool Initialize()
{
Dispose();
if (DeviceInformation == null)
{
throw new WindowsHidException($"{nameof(DeviceInformation)} must be specified before {nameof(Initialize)} can be called.");
}
var pointerToPreParsedData = new IntPtr();
_HidCollectionCapabilities = new HidCollectionCapabilities();
var pointerToBuffer = Marshal.AllocHGlobal(126);
_ReadSafeFileHandle = APICalls.CreateFile(DeviceInformation.DevicePath, APICalls.GenericRead | APICalls.GenericWrite, APICalls.FileShareRead | APICalls.FileShareWrite, IntPtr.Zero, APICalls.OpenExisting, 0, IntPtr.Zero);
_WriteSafeFileHandle = APICalls.CreateFile(DeviceInformation.DevicePath, APICalls.GenericRead | APICalls.GenericWrite, APICalls.FileShareRead | APICalls.FileShareWrite, IntPtr.Zero, APICalls.OpenExisting, 0, IntPtr.Zero);
if (!APICalls.HidD_GetPreparsedData(_ReadSafeFileHandle, ref pointerToPreParsedData))
{
throw new Exception("Could not get pre parsed data");
}
var getCapsResult = APICalls.HidP_GetCaps(pointerToPreParsedData, ref _HidCollectionCapabilities);
//TODO: Deal with issues here
Marshal.FreeHGlobal(pointerToBuffer);
var preparsedDataResult = APICalls.HidD_FreePreparsedData(ref pointerToPreParsedData);
//TODO: Deal with issues here
if (_ReadSafeFileHandle.IsInvalid)
{
return(false);
}
_ReadFileStream = new FileStream(_ReadSafeFileHandle, FileAccess.ReadWrite, _HidCollectionCapabilities.OutputReportByteLength, false);
_WriteFileStream = new FileStream(_WriteSafeFileHandle, FileAccess.ReadWrite, _HidCollectionCapabilities.InputReportByteLength, false);
IsInitialized = true;
Connected?.Invoke(this, new EventArgs());
return(true);
}
internal static extern int HidP_GetCaps(IntPtr pointerToPreparsedData, ref HidCollectionCapabilities hidCollectionCapabilities);
private static DeviceInformation GetDeviceInformation(string devicePath)
{
using (var safeFileHandle = APICalls.CreateFile(devicePath, APICalls.GenericRead | APICalls.GenericWrite, APICalls.FileShareRead | APICalls.FileShareWrite, IntPtr.Zero, APICalls.OpenExisting, 0, IntPtr.Zero))
{
var hidCollectionCapabilities = new HidCollectionCapabilities();
var hidAttributes = new HidAttributes();
var pointerToPreParsedData = new IntPtr();
var product = string.Empty;
var serialNumber = string.Empty;
var manufacturer = string.Empty;
var pointerToBuffer = Marshal.AllocHGlobal(126);
var preparsedDataResult = APICalls.HidD_GetPreparsedData(safeFileHandle, ref pointerToPreParsedData);
if (!preparsedDataResult)
{
return(null);
}
//TODO: Deal with issues here
var getCapsResult = APICalls.HidP_GetCaps(pointerToPreParsedData, ref hidCollectionCapabilities);
//TODO: Deal with issues here
if (!APICalls.HidD_GetAttributes(safeFileHandle, ref hidAttributes))
{
throw new Exception("Could not obtain attributes");
}
if (APICalls.HidD_GetManufacturerString(safeFileHandle, pointerToBuffer, 126))
{
manufacturer = Marshal.PtrToStringUni(pointerToBuffer);
}
if (APICalls.HidD_GetSerialNumberString(safeFileHandle, pointerToBuffer, 126))
{
serialNumber = Marshal.PtrToStringUni(pointerToBuffer);
}
if (APICalls.HidD_GetProductString(safeFileHandle, pointerToBuffer, 126))
{
product = Marshal.PtrToStringUni(pointerToBuffer);
}
Marshal.FreeHGlobal(pointerToBuffer);
var getPreparsedDataResult = APICalls.HidD_FreePreparsedData(ref pointerToPreParsedData);
//TODO: Deal with issues here
var deviceInformation = new DeviceInformation
{
DevicePath = devicePath,
InputReportByteLength = hidCollectionCapabilities.InputReportByteLength,
Manufacturer = manufacturer,
OutputReportByteLength = hidCollectionCapabilities.OutputReportByteLength,
Product = product,
ProductId = (ushort)hidAttributes.ProductId,
SerialNumber = serialNumber,
Usage = hidCollectionCapabilities.Usage,
UsagePage = hidCollectionCapabilities.UsagePage,
VendorId = (ushort)hidAttributes.VendorId,
VersionNumber = (ushort)hidAttributes.VersionNumber
};
return(deviceInformation);
}
}