public BridgeFrameBuffer(Vector?dpi = null)
{
_dpi = dpi ?? new Vector(192, 192);
var instancePath = Locator.FindDfrDevice();
if (instancePath == null)
{
throw new Exception("DFR Display Device not found");
}
_fd = NativeMethods.CreateFile(
instancePath, FileAccess.Write, FileShare.None,
IntPtr.Zero, FileMode.Open, FileOptions.None,
IntPtr.Zero
);
if (_fd == IntPtr.Zero)
{
throw new Exception("Error: " + Marshal.GetLastWin32Error());
}
// At least for now, the DFR display spec is fully known and determined across all devices.
// Should this changes, issue an IOCTL to retrieve device spec in the future.
}
public FnKeyNotifier(Dispatcher dispatcher)
{
var instancePath = Locator.FindDfrDevice();
if (instancePath == null)
{
throw new Exception("DFR Display Device not found");
}
_dispatcher = dispatcher;
_fd = NativeMethods.CreateFile(
instancePath, FileAccess.ReadWrite, FileShare.None,
IntPtr.Zero, FileMode.Open, FileOptions.None,
IntPtr.Zero
);
if (_fd == IntPtr.Zero)
{
throw new Exception("Error: " + Marshal.GetLastWin32Error());
}
ThreadPool.UnsafeQueueUserWorkItem(_ => PollNextFnStatus(), null);
}