internal static bool SetCommTimeouts(IntPtr hPort, CommTimeouts timeouts)
{
if (FullFramework)
{
return(Convert.ToBoolean(WinSetCommTimeouts(hPort, timeouts)));
}
else
{
return(Convert.ToBoolean(CESetCommTimeouts(hPort, timeouts)));
}
}
public bool Open()
{
if (isOpen)
{
return(false);
}
hPort = CommAPI.CreateFile(portName);
if (hPort == (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
int e = Marshal.GetLastWin32Error();
if (e == (int)APIErrors.ERROR_ACCESS_DENIED)
{
// port is unavailable
return(false);
}
if (e == (int)APIErrors.ERROR_PORT_UNAVAIL)
{
// port is unavailable
return(false);
}
// ClearCommError failed!
string error = String.Format("CreateFile Failed: {0}", e);
throw new CommPortException(error);
}
isOpen = true;
// set queue sizes
CommAPI.SetupComm(hPort, rxBufferSize, txBufferSize);
// transfer the port settings to a DCB structure
dcb.BaudRate = (uint)portSettings.BasicSettings.BaudRate;
dcb.ByteSize = portSettings.BasicSettings.ByteSize;
dcb.EofChar = (sbyte)portSettings.EOFChar;
dcb.ErrorChar = (sbyte)portSettings.ErrorChar;
dcb.EvtChar = (sbyte)portSettings.EVTChar;
dcb.fAbortOnError = portSettings.AbortOnError;
dcb.fBinary = true;
dcb.fDsrSensitivity = portSettings.DSRSensitive;
dcb.fDtrControl = (DCB.DtrControlFlags)portSettings.DTRControl;
dcb.fErrorChar = portSettings.ReplaceErrorChar;
dcb.fInX = portSettings.InX;
dcb.fNull = portSettings.DiscardNulls;
dcb.fOutX = portSettings.OutX;
dcb.fOutxCtsFlow = portSettings.OutCTS;
dcb.fOutxDsrFlow = portSettings.OutDSR;
dcb.fParity = (portSettings.BasicSettings.Parity == Parity.none) ? false : true;
dcb.fRtsControl = (DCB.RtsControlFlags)portSettings.RTSControl;
dcb.fTXContinueOnXoff = portSettings.TxContinueOnXOff;
dcb.Parity = (byte)portSettings.BasicSettings.Parity;
dcb.StopBits = (byte)portSettings.BasicSettings.StopBits;
dcb.XoffChar = (sbyte)portSettings.XoffChar;
dcb.XonChar = (sbyte)portSettings.XonChar;
dcb.XonLim = dcb.XoffLim = (ushort)(rxBufferSize / 10);
CommAPI.SetCommState(hPort, dcb);
// store some state values
brk = 0;
dtr = dcb.fDtrControl == DCB.DtrControlFlags.Enable ? 1 : 0;
rts = dcb.fRtsControl == DCB.RtsControlFlags.Enable ? 1 : 0;
// set the Comm timeouts
CommTimeouts ct = new CommTimeouts();
// reading we'll return immediately
// this doesn't seem to work as documented
ct.ReadIntervalTimeout = uint.MaxValue; // this = 0xffffffff
// ct.ReadIntervalTimeout = 2;
ct.ReadTotalTimeoutConstant = 2;
ct.ReadTotalTimeoutMultiplier = uint.MaxValue;
// writing we'll give 5 seconds
ct.WriteTotalTimeoutConstant = 5;
ct.WriteTotalTimeoutMultiplier = 0;
CommAPI.SetCommTimeouts(hPort, ct);
// start the receive thread
eventThread = new Thread(new ThreadStart(CommEventThread));
eventThread.Priority = ThreadPriority.AboveNormal;
eventThread.Start();
// wait for the thread to actually get spun up
threadStarted.WaitOne();
return(true);
}
private static extern int WinSetCommTimeouts(IntPtr hFile, CommTimeouts timeouts);
