private static extern int BuildCommDCB(string lpDef, ref SerialPort.DCB lpDCB);
private static extern int SetCommState(int hFile, ref SerialPort.DCB lpDCB);
public bool Open(string comsettings, int portnum)
{
SerialPort.DCB dCB = default(SerialPort.DCB);
SerialPort.COMMTIMEOUTS cOMMTIMEOUTS = default(SerialPort.COMMTIMEOUTS);
this.Opened = true;
this.hComm = SerialPort.CreateFile("\\\\.\\COM" + portnum.ToString(), 3221225472u, 0, 0, 3, 0, 0);
bool result;
if (this.hComm == -1)
{
SerialPort.CloseHandle(this.hComm);
this.Opened = false;
result = false;
}
else
{
this.retval = SerialPort.GetCommTimeouts(this.hComm, ref cOMMTIMEOUTS);
if (this.retval == -1)
{
SerialPort.CloseHandle(this.hComm);
this.Opened = false;
result = false;
}
else
{
cOMMTIMEOUTS.ReadTotalTimeoutConstant = this.ReadTimeout;
cOMMTIMEOUTS.ReadTotalTimeoutMultiplier = 0;
cOMMTIMEOUTS.WriteTotalTimeoutMultiplier = 0;
cOMMTIMEOUTS.WriteTotalTimeoutConstant = 0;
this.retval = SerialPort.SetCommTimeouts(this.hComm, ref cOMMTIMEOUTS);
if (this.retval == -1)
{
SerialPort.CloseHandle(this.hComm);
this.Opened = false;
result = false;
}
else
{
this.retval = SerialPort.GetCommState(this.hComm, ref dCB);
if (this.retval == -1)
{
SerialPort.CloseHandle(this.hComm);
this.Opened = false;
result = false;
}
else
{
this.retval = SerialPort.BuildCommDCB(comsettings, ref dCB);
if (this.retval == -1)
{
SerialPort.CloseHandle(this.hComm);
this.Opened = false;
result = false;
}
else
{
this.retval = SerialPort.SetCommState(this.hComm, ref dCB);
if (this.retval == -1)
{
SerialPort.CloseHandle(this.hComm);
this.Opened = false;
result = false;
}
else
{
this.PortNum = portnum;
this.ComSettings = comsettings;
result = this.Opened;
}
}
}
}
}
}
return(result);
}