/// <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>
/// Creates the window.
/// </summary>
/// <param name="buffLen">Optional length of the file system changes buffer.</param>
/// <returns>True if successful.</returns>
private bool internalCreate(int buffLen = DefaultBufferSize)
{
if (buffLen < 1024)
{
throw new ArgumentException("Buffer length cannot be smaller than 1k.");
}
try
{
var cp = new CreateParams();
if (_owner != IntPtr.Zero)
{
cp.Style = User32.WS_CHILDWINDOW;
cp.Parent = _owner;
}
CreateHandle(cp);
}
catch
{
return(false);
}
// 128k is definitely enough when the thread is running continuously.
// barring something funky blocking us ...
return(_Buff.AllocZero(buffLen, true));
}