private SerialPortFixer(string portName)
{
if (portName == null || !portName.StartsWith("COM", StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException("Invalid Serial Port", "portName");
}
else
{
SafeFileHandle safeFileHandle = SerialPortFixer.CreateFile(string.Concat("\\\\.\\", portName), unchecked ((int)0x80000000) | unchecked ((int)0x40000000), 0, IntPtr.Zero, 3, 0, IntPtr.Zero);
if (safeFileHandle.IsInvalid)
{
SerialPortFixer.WinIoError();
}
try
{
int fileType = SerialPortFixer.GetFileType(safeFileHandle);
if (fileType == 2 || fileType == 0)
{
this.m_Handle = safeFileHandle;
this.InitializeDcb();
}
else
{
throw new ArgumentException("Invalid Serial Port", "portName");
}
}
catch
{
safeFileHandle.Close();
this.m_Handle = null;
throw;
}
return;
}
}
private void SetCommStateNative(ref SerialPortFixer.Dcb lpDcb)
{
int num = 0;
SerialPortFixer.Comstat comstat = new SerialPortFixer.Comstat();
int num1 = 0;
while (num1 < 10)
{
if (!SerialPortFixer.ClearCommError(this.m_Handle, ref num, ref comstat))
{
SerialPortFixer.WinIoError();
}
if (!SerialPortFixer.SetCommState(this.m_Handle, ref lpDcb))
{
if (num1 == 9)
{
SerialPortFixer.WinIoError();
}
num1++;
}
else
{
return;
}
}
}
private static string GetMessage(int errorCode)
{
StringBuilder stringBuilder = new StringBuilder(512);
if (SerialPortFixer.FormatMessage(12800, new HandleRef(null, IntPtr.Zero), errorCode, 0, stringBuilder, stringBuilder.Capacity, IntPtr.Zero) == 0)
{
return("Unknown Error");
}
else
{
return(stringBuilder.ToString());
}
}
public static void Execute(string portName)
{
using (SerialPortFixer serialPortFixer = new SerialPortFixer(portName))
{
}
}
private static void WinIoError()
{
int lastWin32Error = Marshal.GetLastWin32Error();
throw new IOException(SerialPortFixer.GetMessage(lastWin32Error), SerialPortFixer.MakeHrFromErrorCode(lastWin32Error));
}