/// <summary>
/// Opens the device handles and registers for device removal notification.
/// </summary>
private void OpenDevice()
{
DebugWriteLine("OpenDevice()");
if (_readHandle != null)
{
DebugWriteLine("Device already open");
return;
}
int lastError;
_readHandle = CreateFile(_devicePath + "\\Pipe01", CreateFileAccessTypes.GenericRead, CreateFileShares.None,
IntPtr.Zero, CreateFileDisposition.OpenExisting, CreateFileAttributes.Overlapped,
IntPtr.Zero);
lastError = Marshal.GetLastWin32Error();
if (_readHandle.IsInvalid)
{
_readHandle = null;
throw new Win32Exception(lastError);
}
_writeHandle = CreateFile(_devicePath + "\\Pipe00", CreateFileAccessTypes.GenericWrite, CreateFileShares.None,
IntPtr.Zero, CreateFileDisposition.OpenExisting, CreateFileAttributes.Overlapped,
IntPtr.Zero);
lastError = Marshal.GetLastWin32Error();
if (_writeHandle.IsInvalid)
{
_writeHandle = null;
_readHandle.Dispose();
throw new Win32Exception(lastError);
}
bool success = false;
_readHandle.DangerousAddRef(ref success);
if (success)
{
_notifyWindow.RegisterDeviceRemoval(_readHandle.DangerousGetHandle());
}
else
{
DebugWriteLine("Warning: Failed to initialize device removal notification");
}
_deviceAvailable = true;
}
