/// <summary>
/// Returns the short value of a Hid feature code.
/// </summary>
/// <param name="featureCode">The Hid feature code to retrieve.</param>
/// <param name="result">Receives the result of the operation.</param>
/// <returns>True if successful.</returns>
/// <remarks></remarks>
public bool HidGetFeature(byte featureCode, ref short result)
{
bool HidGetFeatureRet = default;
var hfile = HidFeatures.OpenHid(this);
if (hfile == IntPtr.Zero)
{
return(false);
}
var mm = new MemPtr();
mm.Alloc(3L);
mm.ByteAt(0L) = featureCode;
if (!UsbLibHelpers.HidD_GetFeature(hfile, mm, 3))
{
HidGetFeatureRet = false;
}
else
{
HidGetFeatureRet = true;
result = mm.ShortAtAbsolute(1L);
}
mm.Free();
HidFeatures.CloseHid(hfile);
return(HidGetFeatureRet);
}
/// <summary>
/// Retrieves a feature from the device.
/// </summary>
/// <param name="device"></param>
/// <param name="code"></param>
/// <param name="datalen"></param>
/// <returns></returns>
/// <remarks></remarks>
public static HIDFeatureResult GetHIDFeature(IntPtr device, int code, int datalen = 16)
{
HIDFeatureResult GetHIDFeatureRet = default;
MemPtr mm = new MemPtr();
int i = code;
try
{
mm.AllocZero(datalen);
mm.ByteAt(0L) = (byte)i;
if (UsbLibHelpers.HidD_GetFeature(device, mm.Handle, (int)mm.Length))
{
GetHIDFeatureRet = new HIDFeatureResult(i, mm);
}
else
{
GetHIDFeatureRet = null;
}
mm.Free();
}
catch
{
mm.Free();
return(null);
}
return(GetHIDFeatureRet);
}
/// <summary>
/// Returns the raw byte data for a Hid feature code.
/// </summary>
/// <param name="featureCode">The Hid feature code to retrieve.</param>
/// <param name="result">Receives the result of the operation.</param>
/// <param name="expectedSize">The expected size, in bytes, of the result.</param>
/// <returns>True if successful.</returns>
/// <remarks></remarks>
public bool HidGetFeature(byte featureCode, ref byte[] result, int expectedSize)
{
bool HidGetFeatureRet = default;
var hfile = HidFeatures.OpenHid(this);
if (hfile == IntPtr.Zero)
{
return(false);
}
var mm = new MemPtr();
mm.Alloc(expectedSize + 1);
mm.ByteAt(0L) = featureCode;
if (!UsbLibHelpers.HidD_GetFeature(hfile, mm, expectedSize))
{
HidGetFeatureRet = false;
}
else
{
HidGetFeatureRet = true;
result = mm.ToByteArray(1L, expectedSize);
}
HidFeatures.CloseHid(hfile);
mm.Free();
return(HidGetFeatureRet);
}