/// <summary>
/// Get joystick event
/// </summary>
/// <returns>The event.</returns>
public JoystickEvent GetEvent()
{
JoystickEvent joystickEvent;
if (this.shutdownEvent != null)
{
if (!this.eventQueue.TryDequeue(out joystickEvent))
{
joystickEvent = null;
}
}
else
{
byte[] eventData = new byte[8];
var dataRead = this.joystickDeviceStream.Read(eventData, 0, eventData.Length);
if (dataRead == 0)
{
joystickEvent = null;
}
else
{
if (dataRead != eventData.Length)
{
throw new ApplicationException("Failed to read joystick data");
}
joystickEvent = new JoystickEvent(eventData);
}
}
return(joystickEvent);
}
/// <summary>
/// Data Reader worker thread
/// </summary>
private void DataReaderWorker()
{
var waitHandles = new WaitHandle[] { this.shutdownEvent.WaitHandle, null };
var buffer = new byte[EventBufferSize];
IAsyncResult asyncResult = null;
while (true)
{
try
{
asyncResult = this.joystickDeviceStream.BeginRead(
buffer,
0,
EventBufferSize,
null,
null);
waitHandles[1] = asyncResult.AsyncWaitHandle;
if (WaitHandle.WaitAny(waitHandles) == 0)
{
break;
}
var dataRead = this.joystickDeviceStream.EndRead(asyncResult);
if (dataRead != EventBufferSize)
{
var errorMessage = string.Format(
CultureInfo.InvariantCulture,
"Expected to read {0} bytes from joystick device \"{1}\". However, only {2} bytes returned",
EventBufferSize,
this.joystickDeviceFullName,
dataRead);
throw new IOException(errorMessage);
}
var joystickEvent = new JoystickEvent(buffer);
this.eventQueue.Enqueue(joystickEvent);
}
catch (Exception exception)
{
Trace.TraceError("Joystick.DataReaderWorker: " + exception.ToString());
break;
}
}
}