/// <summary>
/// Get all Hid devices currently connected to the PC.
/// </summary>
/// <returns>
/// The Enumerable of Hid Devices.
/// </returns>
internal static IEnumerable <HidInformation> GetHidObjects()
{
var response = new List <HidInformation>();
// Iterate through all items found and connect to the first one that we
// Gain a valid windowHandle from.
foreach (var hidItem in GetHidPaths())
{
bool isReadOnly = false;
var deviceHandle = OpenDevice(hidItem, ref isReadOnly);
// We don't have a Valid Device.
if (deviceHandle.IsInvalid)
{
deviceHandle.Dispose();
continue;
}
var deviceInformation = new HidInformation {
DevicePath = hidItem, IsReadOnly = isReadOnly
};
IntPtr parsedData;
if (!HidD_GetPreparsedData(deviceHandle, out parsedData))
{
HidD_FreePreparsedData(ref parsedData);
continue;
}
try
{
HidAttributes temp;
HidD_GetAttributes(deviceHandle, out temp);
deviceInformation.HidAttributes = temp;
HidCaps caps;
HidP_GetCaps(parsedData, out caps);
deviceInformation.Capabilities = caps;
ReadDeviceCapabilities(caps, parsedData, ref deviceInformation);
response.Add(deviceInformation);
}
catch
{
Console.WriteLine(new Win32Exception(Marshal.GetLastWin32Error()).Message);
}
finally
{
HidD_FreePreparsedData(ref parsedData);
deviceHandle.Dispose();
}
}
return(response);
}
/// <summary>
/// The read capabilities.
/// </summary>
/// <param name="caps">
/// The caps.
/// </param>
/// <param name="pointer">
/// The pointer.
/// </param>
/// <param name="hidInformation">
/// The Device Information.
/// </param>
internal static void ReadDeviceCapabilities(HidCaps caps, IntPtr pointer, ref HidInformation hidInformation)
{
if (caps.NumberOutputValueCaps > 0)
{
hidInformation.OutputValues.ValueCaps = new HidValueCaps[caps.NumberOutputValueCaps];
HidP_GetValueCaps(
HidReportType.Output,
hidInformation.OutputValues.ValueCaps,
ref caps.NumberOutputValueCaps,
pointer);
}
if (caps.NumberOutputButtonCaps > 0)
{
hidInformation.OutputValues.ValueButtons = new HidButtonCaps[caps.NumberOutputButtonCaps];
HidP_GetButtonCaps(
HidReportType.Output,
hidInformation.OutputValues.ValueButtons,
ref caps.NumberOutputButtonCaps,
pointer);
}
if (caps.NumberInputValueCaps > 0)
{
hidInformation.InputValues.ValueCaps = new HidValueCaps[caps.NumberInputValueCaps];
HidP_GetValueCaps(
HidReportType.Input,
hidInformation.InputValues.ValueCaps,
ref caps.NumberInputValueCaps,
pointer);
}
if (caps.NumberInputButtonCaps > 0)
{
hidInformation.InputValues.ValueButtons = new HidButtonCaps[caps.NumberInputButtonCaps];
HidP_GetButtonCaps(
HidReportType.Input,
hidInformation.InputValues.ValueButtons,
ref caps.NumberInputButtonCaps,
pointer);
}
if (caps.NumberFeatureValueCaps > 0)
{
hidInformation.FeatureValues.ValueCaps = new HidValueCaps[caps.NumberFeatureValueCaps];
HidP_GetValueCaps(
HidReportType.Feature,
hidInformation.FeatureValues.ValueCaps,
ref caps.NumberFeatureValueCaps,
pointer);
}
if (caps.NumberFeatureButtonCaps <= 0)
{
return;
}
hidInformation.FeatureValues.ValueButtons = new HidButtonCaps[caps.NumberFeatureButtonCaps];
HidP_GetButtonCaps(
HidReportType.Feature,
hidInformation.FeatureValues.ValueButtons,
ref caps.NumberFeatureButtonCaps,
pointer);
}
