private void ReceiveThread()
{
byte[] lpBuffer = new byte[1];
bool flag = true;
AutoResetEvent event2 = new AutoResetEvent(false);
Win32Com.OVERLAPPED structure = new Win32Com.OVERLAPPED();
uint num2 = 0;
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(structure));
IntPtr ptr2 = Marshal.AllocHGlobal(Marshal.SizeOf(num2));
structure.Offset = 0;
structure.OffsetHigh = 0;
structure.hEvent = event2.Handle;
Marshal.StructureToPtr(structure, ptr, true);
try
{
while (true)
{
if (!Win32Com.SetCommMask(this.hPort, 0x1fd))
{
throw new CommPortException("IO Error [001]");
}
Marshal.WriteInt32(ptr2, 0);
if (flag)
{
this.startEvent.Set();
flag = false;
}
if (!Win32Com.WaitCommEvent(this.hPort, ptr2, ptr))
{
if (Marshal.GetLastWin32Error() != 0x3e5L)
{
throw new CommPortException("IO Error [002]");
}
event2.WaitOne();
}
num2 = (uint)Marshal.ReadInt32(ptr2);
if ((num2 & 0x80) != 0)
{
uint num3;
if (!Win32Com.ClearCommError(this.hPort, out num3, IntPtr.Zero))
{
throw new CommPortException("IO Error [003]");
}
int num4 = 0;
StringBuilder builder = new StringBuilder("UART Error: ", 40);
if ((num3 & 8) != 0)
{
builder = builder.Append("Framing,");
num4++;
}
if ((num3 & 0x400) != 0)
{
builder = builder.Append("IO,");
num4++;
}
if ((num3 & 2) != 0)
{
builder = builder.Append("Overrun,");
num4++;
}
if ((num3 & 1) != 0)
{
builder = builder.Append("Receive Cverflow,");
num4++;
}
if ((num3 & 4) != 0)
{
builder = builder.Append("Parity,");
num4++;
}
if ((num3 & 0x100) != 0)
{
builder = builder.Append("Transmit Overflow,");
num4++;
}
if (num4 > 0)
{
builder.Length--;
throw new CommPortException(builder.ToString());
}
if (num3 != 0x10)
{
throw new CommPortException("IO Error [003]");
}
num2 |= 0x40;
}
if ((num2 & 1) != 0)
{
uint num;
do
{
num = 0;
if (!Win32Com.ReadFile(this.hPort, lpBuffer, 1, out num, ptr))
{
int num5 = Marshal.GetLastWin32Error();
throw new CommPortException("IO Error [004]");
}
if (num == 1)
{
this.OnRxChar(lpBuffer[0]);//这个就是触发事件
}
}while (num > 0);
}
if ((num2 & 4) != 0)
{
lock (this.empty)
{
this.empty[0] = true;
}
this.OnTxDone();
}
if ((num2 & 0x40) != 0)
{
this.OnBreak();
}
uint val = 0;
if ((num2 & 8) != 0)
{
val |= 0x10;
}
if ((num2 & 0x10) != 0)
{
val |= 0x20;
}
if ((num2 & 0x20) != 0)
{
val |= 0x80;
}
if ((num2 & 0x100) != 0)
{
val |= 0x40;
}
if (val != 0)
{
uint num7;
if (!Win32Com.GetCommModemStatus(this.hPort, out num7))
{
throw new CommPortException("IO Error [005]");
}
this.OnStatusChange(new ModemStatus(val), new ModemStatus(num7));
}
}
}
catch (Exception exception)
{
Win32Com.CancelIo(this.hPort);
if (ptr2 != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptr2);
}
if (ptr != IntPtr.Zero)
{
Marshal.FreeHGlobal(ptr);
}
if (!(exception is ThreadAbortException))
{
this.rxException = exception;
this.OnRxException(exception);
}
}
}
public bool Open()
{
Win32Com.DCB lpDCB = new Win32Com.DCB();
Win32Com.COMMTIMEOUTS lpCommTimeouts = new Win32Com.COMMTIMEOUTS();
Win32Com.OVERLAPPED structure = new Win32Com.OVERLAPPED();
if (!this.online)
{
CommBaseSettings settings = this.CommSettings();
this.hPort = Win32Com.CreateFile(settings.port, 0xc0000000, 0, IntPtr.Zero, 3, 0x40000000, IntPtr.Zero);
if (this.hPort == ((IntPtr)(-1)))
{
if (Marshal.GetLastWin32Error() == 5L)
{
return(false);
}
this.hPort = Win32Com.CreateFile(this.AltName(settings.port), 0xc0000000, 0, IntPtr.Zero, 3, 0x40000000, IntPtr.Zero);
if (this.hPort == ((IntPtr)(-1)))
{
if (Marshal.GetLastWin32Error() != 5L)
{
throw new CommPortException("Port Open Failure");
}
return(false);
}
}
this.online = true;
lpCommTimeouts.ReadIntervalTimeout = uint.MaxValue;
lpCommTimeouts.ReadTotalTimeoutConstant = 0;
lpCommTimeouts.ReadTotalTimeoutMultiplier = 0;
if (settings.sendTimeoutMultiplier == 0)
{
if (Environment.OSVersion.Platform == PlatformID.Win32NT)
{
lpCommTimeouts.WriteTotalTimeoutMultiplier = 0;
}
else
{
lpCommTimeouts.WriteTotalTimeoutMultiplier = 0x2710;
}
}
else
{
lpCommTimeouts.WriteTotalTimeoutMultiplier = settings.sendTimeoutMultiplier;
}
lpCommTimeouts.WriteTotalTimeoutConstant = settings.sendTimeoutConstant;
lpDCB.init((settings.parity == Parity.odd) || (settings.parity == Parity.even), settings.txFlowCTS, settings.txFlowDSR, (int)settings.useDTR, settings.rxGateDSR, !settings.txWhenRxXoff, settings.txFlowX, settings.rxFlowX, (int)settings.useRTS);
lpDCB.BaudRate = settings.baudRate;
lpDCB.ByteSize = (byte)settings.dataBits;
lpDCB.Parity = (byte)settings.parity;
lpDCB.StopBits = (byte)settings.stopBits;
lpDCB.XoffChar = (byte)settings.XoffChar;
lpDCB.XonChar = (byte)settings.XonChar;
if (((settings.rxQueue != 0) || (settings.txQueue != 0)) && !Win32Com.SetupComm(this.hPort, (uint)settings.rxQueue, (uint)settings.txQueue))
{
this.ThrowException("Bad queue settings");
}
if ((settings.rxLowWater == 0) || (settings.rxHighWater == 0))
{
Win32Com.COMMPROP commprop;
if (!Win32Com.GetCommProperties(this.hPort, out commprop))
{
commprop.dwCurrentRxQueue = 0;
}
if (commprop.dwCurrentRxQueue > 0)
{
lpDCB.XoffLim = lpDCB.XonLim = (short)(commprop.dwCurrentRxQueue / 10);
}
else
{
lpDCB.XoffLim = (short)(lpDCB.XonLim = 8);
}
}
else
{
lpDCB.XoffLim = (short)settings.rxHighWater;
lpDCB.XonLim = (short)settings.rxLowWater;
}
if (!Win32Com.SetCommState(this.hPort, ref lpDCB))
{
this.ThrowException("Bad com settings");
}
if (!Win32Com.SetCommTimeouts(this.hPort, ref lpCommTimeouts))
{
this.ThrowException("Bad timeout settings");
}
this.stateBRK = 0;
if (settings.useDTR == HSOutput.none)
{
this.stateDTR = 0;
}
if (settings.useDTR == HSOutput.online)
{
this.stateDTR = 1;
}
if (settings.useRTS == HSOutput.none)
{
this.stateRTS = 0;
}
if (settings.useRTS == HSOutput.online)
{
this.stateRTS = 1;
}
this.checkSends = settings.checkAllSends;
structure.Offset = 0;
structure.OffsetHigh = 0;
if (this.checkSends)
{
structure.hEvent = this.writeEvent.Handle;
}
else
{
structure.hEvent = IntPtr.Zero;
}
this.ptrUWO = Marshal.AllocHGlobal(Marshal.SizeOf(structure));
Marshal.StructureToPtr(structure, this.ptrUWO, true);
this.writeCount = 0;
this.empty[0] = true;
this.dataQueued = false;
this.rxException = null;
this.rxExceptionReported = false;
this.rxThread = new Thread(new ThreadStart(this.ReceiveThread));//打开串口的同时也打开了接收线程
this.rxThread.Name = "CommBaseRx";
this.rxThread.Priority = ThreadPriority.AboveNormal;
this.rxThread.Start();
this.startEvent.WaitOne(500, false);
this.auto = false;
if (this.AfterOpen())
{
this.auto = settings.autoReopen;
return(true);
}
this.Close();
}
return(false);
}