public bool Open(HidInfo hidInfo)
{
Close();
SafeFileHandle shandle;
// Open HID device file
handle = Native.CreateFile(hidInfo.Path,
Native.GENERIC_READ | Native.GENERIC_WRITE,
Native.FILE_SHARE_READ | Native.FILE_SHARE_WRITE,
IntPtr.Zero, Native.OPEN_EXISTING, Native.FILE_FLAG_OVERLAPPED,
IntPtr.Zero);
// Return failure if handle is invalid
if (handle == Native.INVALID_HANDLE_VALUE)
{
return(false);
}
// Open safe file handle
shandle = new SafeFileHandle(handle, false);
// Prepare stream - async
fileStream = new FileStream(shandle, FileAccess.ReadWrite, 32, true);
// Start asyncronous receive task
receiveQueue = new BlockingCollection <byte[]>(1000);
if (receiveTask != null)
{
if (!receiveTask.IsCompleted)
{
throw new Exception("Task already running");
}
}
receiveTask = new Task(() => ReceiveTask(receiveQueue), TaskCreationOptions.LongRunning);
receiveTask.Start();
hidDeviceState = HidDeviceState.Open;
// Return success
return(true);
}
public void Close()
{
if (hidDeviceState == HidDeviceState.Open)
{
// Stop Receive Task
if (!receiveQueue.IsCompleted)
{
receiveQueue.CompleteAdding();
}
// Handle filestream
if (fileStream != null)
{
fileStream.Close();
fileStream = null;
}
// Close native HID handle
Native.CloseHandle(handle);
hidDeviceState = HidDeviceState.Closed;
}
}
