public void Open(string name, int speed)
{
var portDcb = new DCB();
var commTimeouts = new COMMTIMEOUTS();
_hPort = Win32.CreateFile($@"\\.\{name}", Win32.GENERIC_READ | Win32.GENERIC_WRITE, 0, IntPtr.Zero, Win32.OPEN_EXISTING, 0, IntPtr.Zero);
if (_hPort == (IntPtr)Win32.INVALID_HANDLE_VALUE)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
commTimeouts.ReadIntervalTimeout = 0;
commTimeouts.ReadTotalTimeoutConstant = 1500;
commTimeouts.ReadTotalTimeoutMultiplier = 15;
commTimeouts.WriteTotalTimeoutConstant = 1500;
commTimeouts.WriteTotalTimeoutMultiplier = 15;
Win32.GetCommState(_hPort, ref portDcb);
portDcb.BaudRate = speed;
if (!Win32.SetCommState(_hPort, ref portDcb))
{
throw new IOException("Bad COM settings");
}
if (!Win32.SetCommTimeouts(_hPort, ref commTimeouts))
{
throw new IOException("Bad timeout settings");
}
}
internal static extern Boolean SetCommTimeouts(IntPtr hFile, [In] ref COMMTIMEOUTS lpCommTimeouts);
internal static extern Boolean BuildCommDCBAndTimeouts(String lpDef, ref DCB lpDCB, ref COMMTIMEOUTS lpCommTimeouts);
internal static extern Boolean GetCommTimeouts(IntPtr hFile, out COMMTIMEOUTS lpCommTimeouts);
