/// <summary>
/// Open the port specified by the Port property.
/// </summary>
public void Open()
{
if (IsDisposed)
{
throw new ObjectDisposedException("NativeSerialPort");
}
if (string.IsNullOrWhiteSpace(m_Port))
{
throw new InvalidOperationException("Port must first be set");
}
if (IsOpen)
{
throw new InvalidOperationException("Serial Port currently open");
}
m_ComPortHandle = UnsafeNativeMethods.CreateFile(@"\\.\" + m_Port,
NativeMethods.FileAccess.GENERIC_READ | NativeMethods.FileAccess.GENERIC_WRITE,
NativeMethods.FileShare.FILE_SHARE_NONE,
IntPtr.Zero,
NativeMethods.CreationDisposition.OPEN_EXISTING,
NativeMethods.FileAttributes.FILE_FLAG_OVERLAPPED,
IntPtr.Zero);
if (m_ComPortHandle.IsInvalid)
{
WinIOError();
}
NativeMethods.FileType t = UnsafeNativeMethods.GetFileType(m_ComPortHandle);
if (t != NativeMethods.FileType.FILE_TYPE_CHAR && t != NativeMethods.FileType.FILE_TYPE_UNKNOWN)
{
m_ComPortHandle.Close();
m_ComPortHandle = null;
throw new IOException("Wrong Filetype: " + m_Port);
}
// Set the default parameters
UnsafeNativeMethods.SetupComm(m_ComPortHandle, m_DriverInQueue, m_DriverOutQueue);
m_CommState = new CommState(m_ComPortHandle, m_CommState);
m_CommProperties = new CommProperties(m_ComPortHandle);
m_CommModem = new CommModemStatus(m_ComPortHandle);
CommOverlappedIo commIo = new CommOverlappedIo(m_ComPortHandle, m_CommIo, Port);
m_CommIo.Dispose();
m_CommIo = commIo;
}
/// <summary>
/// Closes the serial port.
/// </summary>
/// <exception cref="System.ObjectDisposedException"/>
/// <remarks>
/// Closing the serial port invalidates actions that can be done to the serial port,
/// but it does not prevent the serial port from being reopened
/// </remarks>
public void Close()
{
if (m_IsDisposed)
{
throw new ObjectDisposedException("WinNativeSerial");
}
if (IsOpen)
{
m_CommOverlappedIo.Dispose();
m_CommOverlappedIo = null;
m_CommState = null;
m_CommModemStatus = null;
m_ComPortHandle.Dispose();
m_ComPortHandle = null;
}
}