internal static bool WaitCommEvent(IntPtr hPort, ref CommEventFlags flags)
{
if (FullFramework)
{
return(Convert.ToBoolean(WinWaitCommEvent(hPort, ref flags, IntPtr.Zero)));
}
else
{
return(Convert.ToBoolean(CEWaitCommEvent(hPort, ref flags, IntPtr.Zero)));
}
}
internal static bool SetCommMask(IntPtr hPort, CommEventFlags dwEvtMask)
{
if (FullFramework)
{
return(Convert.ToBoolean(WinSetCommMask(hPort, dwEvtMask)));
}
else
{
if (CommEventFlags.ALL == dwEvtMask)
{
//This is a CE device so include the POWER event
dwEvtMask = CommEventFlags.ALL_CE;
}
return(Convert.ToBoolean(CESetCommMask(hPort, dwEvtMask)));
}
}
private void CommEventThread()
{
CommEventFlags eventFlags = new CommEventFlags();
byte[] readbuffer = new Byte[rxBufferSize];
int bytesread = 0;
AutoResetEvent rxevent = new AutoResetEvent(false);
// specify the set of events to be monitored for the port.
if (CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
// set up the overlapped IO
OVERLAPPED o = new OVERLAPPED();
rxOverlapped = LocalAlloc(0x40, Marshal.SizeOf(o));
o.Offset = 0;
o.OffsetHigh = 0;
o.hEvent = rxevent.Handle;
Marshal.StructureToPtr(o, rxOverlapped, true);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
try
{
// let Open() know we're started
threadStarted.Set();
#region >>>> thread loop <<<<
while (hPort != (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
// wait for a Comm event
if (!m_CommAPI.WaitCommEvent(hPort, ref eventFlags))
{
int e = Marshal.GetLastWin32Error();
if (e == (int)APIErrors.ERROR_IO_PENDING)
{
// IO pending so just wait and try again
rxevent.WaitOne();
Thread.Sleep(0);
continue;
}
if (e == (int)APIErrors.ERROR_INVALID_HANDLE)
{
// Calling Port.Close() causes hPort to become invalid
// Since Thread.Abort() is unsupported in the CF, we must
// accept that calling Close will throw an error here.
// Close signals the closeEvent, so wait on it
// We wait 1 second, though Close should happen much sooner
int eventResult = m_CommAPI.WaitForSingleObject(closeEvent, 1000);
if (eventResult == (int)APIConstants.WAIT_OBJECT_0)
{
// the event was set so close was called
hPort = (IntPtr)CommAPI.INVALID_HANDLE_VALUE;
// reset our ResetEvent for the next call to Open
threadStarted.Reset();
if (isOpen) // this should not be the case...if so, throw an exception for the owner
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
return;
}
}
// WaitCommEvent failed
// 995 means an exit was requested (thread killed)
if (e == 995)
{
return;
}
else
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
}
// Re-specify the set of events to be monitored for the port.
if (CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
// check the event for errors
#region >>>> error checking <<<<
if (((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
{
CommErrorFlags errorFlags = new CommErrorFlags();
CommStat commStat = new CommStat();
// get the error status
if (!m_CommAPI.ClearCommError(hPort, ref errorFlags, commStat))
{
// ClearCommError failed!
string error = String.Format("ClearCommError Failed: {0}", Marshal.GetLastWin32Error());
throw new CommPortException(error);
}
if (((uint)errorFlags & (uint)CommErrorFlags.BREAK) != 0)
{
// BREAK can set an error, so make sure the BREAK bit is set an continue
eventFlags |= CommEventFlags.BREAK;
}
else
{
// we have an error. Build a meaningful string and throw an exception
StringBuilder s = new StringBuilder("UART Error: ", 80);
if ((errorFlags & CommErrorFlags.FRAME) != 0)
{
s = s.Append("Framing,");
}
if ((errorFlags & CommErrorFlags.IOE) != 0)
{
s = s.Append("IO,");
}
if ((errorFlags & CommErrorFlags.OVERRUN) != 0)
{
s = s.Append("Overrun,");
}
if ((errorFlags & CommErrorFlags.RXOVER) != 0)
{
s = s.Append("Receive Overflow,");
}
if ((errorFlags & CommErrorFlags.RXPARITY) != 0)
{
s = s.Append("Parity,");
}
if ((errorFlags & CommErrorFlags.TXFULL) != 0)
{
s = s.Append("Transmit Overflow,");
}
// no known bits are set
if (s.Length == 12)
{
s = s.Append("Unknown");
}
// raise an error event
if (OnError != null)
{
OnError(s.ToString());
}
continue;
}
} // if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
#endregion
#region >>>> line status checking <<<<
// check for status changes
uint status = 0;
m_CommAPI.GetCommModemStatus(hPort, ref status);
// check the CTS
if (((uint)eventFlags & (uint)CommEventFlags.CTS) != 0)
{
if (CTSChange != null)
{
CTSChange((status & (uint)CommModemStatusFlags.MS_CTS_ON) != 0);
}
}
// check the DSR
if (((uint)eventFlags & (uint)CommEventFlags.DSR) != 0)
{
if (DSRChange != null)
{
DSRChange((status & (uint)CommModemStatusFlags.MS_DSR_ON) != 0);
}
}
// check for a RING
if (((uint)eventFlags & (uint)CommEventFlags.RING) != 0)
{
if (RingChange != null)
{
RingChange((status & (uint)CommModemStatusFlags.MS_RING_ON) != 0);
}
}
// check for a RLSD
if (((uint)eventFlags & (uint)CommEventFlags.RLSD) != 0)
{
if (RLSDChange != null)
{
RLSDChange((status & (uint)CommModemStatusFlags.MS_RLSD_ON) != 0);
}
}
// check for TXEMPTY
if (((uint)eventFlags & (uint)CommEventFlags.TXEMPTY) != 0)
{
if (TxDone != null)
{
TxDone();
}
}
// check for RXFLAG
if (((uint)eventFlags & (uint)CommEventFlags.RXFLAG) != 0)
{
if (FlagCharReceived != null)
{
FlagCharReceived();
}
}
// check for POWER
if (((uint)eventFlags & (uint)CommEventFlags.POWER) != 0)
{
if (PowerEvent != null)
{
PowerEvent();
}
}
// check for high-water state
if ((eventFlags & CommEventFlags.RX80FULL) != 0)
{
if (HighWater != null)
{
HighWater();
}
}
#endregion
#region >>>> Receive data subsection <<<<
// check for RXCHAR
if ((eventFlags & CommEventFlags.RXCHAR) != 0)
{
do
{
// make sure the port handle is valid
if (hPort == (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
bytesread = 0;
break;
}
// data came in, put it in the buffer and set the event
if (!m_CommAPI.ReadFile(hPort, readbuffer, rxBufferSize, ref bytesread, rxOverlapped))
{
string errString = String.Format("ReadFile Failed: {0}", Marshal.GetLastWin32Error());
if (OnError != null)
{
OnError(errString);
}
return;
}
if (bytesread >= 1)
{
// take the mutex
rxBufferBusy.WaitOne();
// put the data into the fifo
// this *may* be a perf problem and needs testing
for (int b = 0; b < bytesread; b++)
{
rxFIFO.Enqueue(readbuffer[b]);
}
// get the FIFO length
int fifoLength = rxFIFO.Count;
// release the mutex
rxBufferBusy.ReleaseMutex();
// fire the DataReceived event every RThreshold bytes
if ((DataReceived != null) && (rthreshold != 0) && (fifoLength >= rthreshold))
{
DataReceived();
}
}
} while (bytesread > 0);
} // if((eventFlags & CommEventFlags.RXCHAR) != 0)
#endregion
} // while(true)
#endregion
} // try
catch (Exception e)
{
if (rxOverlapped != IntPtr.Zero)
{
LocalFree(rxOverlapped);
}
if (OnError != null)
{
OnError(e.Message);
}
return;
}
}
/// <summary>
/// Runs solely on a separate thread waiting on events to come in
/// from the communication port (OS) and handles those events.
/// </summary>
/// <remarks>Assumption made that port is open.</remarks>
/// <exception cref="System.Exception">
/// Thrown when a communication port error or a
/// system exception occurs.
/// </exception>
/// Revision History
/// MM/DD/YY who Version Issue# Description
/// -------- --- ------- ------ ---------------------------------------
/// 08/01/05 bdm 7.13.00 N/A Created
/// 08/17/06 mrj 7.35.00 Removed unused events
/// 03/02/07 mrj 8.00.16 Changed when the FlagCharReceived event
/// is fired.
///
private void CommEventThread()
{
CommEventFlags eventFlags = new CommEventFlags();
byte[] readbuffer = new Byte[m_uintRxBufSz];
string strErrDesc;
int intErr;
try
{
//Specify the set of events to be monitored for the port.
PortAPI.SetCommMask(m_hPort, CommEventFlags.ALL);
//Let Open() know the tread has started
m_rxThreadStartedEvent.Set();
while (IsOpen)
{
//Wait for a Comm event to happen
if (false == PortAPI.WaitCommEvent(m_hPort, ref eventFlags))
{
//WaitCommEvent failed - find out why
intErr = Marshal.GetLastWin32Error();
if (intErr == (int)APIErrors.ERROR_IO_PENDING)
{
//IO pending so just wait and try again.
//Suspend thread to allow other threads to execute.
Thread.Sleep(0);
continue;
}
if (intErr == (int)APIErrors.ERROR_INVALID_HANDLE)
{
//Calling Communication.Close() causes m_hPort to
//become invalid.
//Since Thread.Abort() is unsupported in the CF,
//we must accept that calling Close will throw
//an error here.
//Close signals the m_ptrCloseEvent, so wait on it
//We wait 1 second, though Close should happen
//much sooner
int intEventResult = PortAPI.WaitForSingleObject(m_ptrCloseEvent, 1000);
if (intEventResult == (int)APIConstants.WAIT_OBJECT_0)
{
// the event was set so close was called
m_hPort = (IntPtr)PortAPI.INVALID_HANDLE_VALUE;
// reset our ResetEvent for the next call
//to Open()
m_rxThreadStartedEvent.Reset();
return;
}
}
//WaitCommEvent failed!
strErrDesc = m_rmStrings.GetString("WAIT_COMM_EVENT_FAILED");
strErrDesc = string.Format(strErrDesc, intErr);
throw (new Exception(strErrDesc));
}
//Re-specify the set of events to be monitored for the port.
PortAPI.SetCommMask(m_hPort, CommEventFlags.ALL);
//Check the event for errors
if (((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
{
CommErrorFlags errorFlags = new CommErrorFlags();
CommStat commStat = new CommStat();
//Get the error status
if (false == PortAPI.ClearCommError(m_hPort,
ref errorFlags,
commStat))
{
//ClearCommError failed!
intErr = Marshal.GetLastWin32Error();
strErrDesc = m_rmStrings.GetString("CLEAR_COMM_ERROR_FAILED");
strErrDesc = string.Format(strErrDesc, intErr);
throw (new Exception(strErrDesc));
}
if (((uint)errorFlags & (uint)CommErrorFlags.BREAK) != 0)
{
//BREAK can set an error, so make sure the BREAK bit
//is set an continue
eventFlags |= CommEventFlags.BREAK;
}
else
{
//We have an error. Build a meaningful string and throw
//an exception
StringBuilder strMsg = new StringBuilder("UART Error: ", 80);
if ((errorFlags & CommErrorFlags.FRAME) != 0)
{
strMsg = strMsg.Append("Framing,");
}
if ((errorFlags & CommErrorFlags.IOE) != 0)
{
strMsg = strMsg.Append("IO,");
}
if ((errorFlags & CommErrorFlags.OVERRUN) != 0)
{
strMsg = strMsg.Append("Overrun,");
}
if ((errorFlags & CommErrorFlags.RXOVER) != 0)
{
strMsg = strMsg.Append("Receive Overflow,");
}
if ((errorFlags & CommErrorFlags.RXPARITY) != 0)
{
strMsg = strMsg.Append("Parity,");
}
if ((errorFlags & CommErrorFlags.TXFULL) != 0)
{
strMsg = strMsg.Append("Transmit Overflow,");
}
//No known bits are set
if (strMsg.Length == 12)
{
strMsg = strMsg.Append("Unknown");
}
//Raise an error event to anyone listening
//if (null != OnError)
//OnError(strMsg.ToString());
continue;
}
} //End if( ( (uint)eventFlags & (uint)CommEventFlags.ERR ) != 0 )
//Check for status changes
//08-12-05 bdm: Frankly, not sure for what purpose status = 0.
// But hesitate to modify since the code was borrowed
// and there does not exist a client that catches
// these events.
//uint status = 0;
//Check for RXFLAG
if (((uint)eventFlags & (uint)CommEventFlags.RXFLAG) != 0)
{
//if (null != FlagCharReceived)
//FlagCharReceived();
}
//Check for RXCHAR
if ((eventFlags & CommEventFlags.RXCHAR) != 0)
{
//Let the client know that we have received a character
if (null != FlagCharReceived)
{
FlagCharReceived();
}
}
} // while(true)
} // try
catch (Exception e)
{
throw (e);
}
}
private static extern int WinWaitCommEvent(IntPtr hFile, ref CommEventFlags lpEvtMask, IntPtr lpOverlapped);
private static extern int WinSetCommMask(IntPtr handle, CommEventFlags dwEvtMask);
override internal bool SetCommMask(IntPtr hPort, CommEventFlags dwEvtMask)
{
return Convert.ToBoolean(WinSetCommMask(hPort, dwEvtMask));
}
private void CommEventThread()
{
CommEventFlags eventFlags = new CommEventFlags();
byte[] readbuffer = new byte[1000];
int bytesread = 0;
// specify the set of events to be monitored for the port.
CommAPI.SetCommMask(hPort, CommEventFlags.RXCHAR);
try {
// let Open() know we're started
threadStarted.Set();
while (hPort != (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
try {
// wait for a Comm event
if (!CommAPI.WaitCommEvent(hPort, ref eventFlags))
{
int e = Marshal.GetLastWin32Error();
if (e == (int)APIErrors.ERROR_IO_PENDING)
{
// IO pending so just wait and try again
Thread.Sleep(0);
continue;
}
if (e == (int)APIErrors.ERROR_INVALID_HANDLE)
{
// Calling Port.Close() causes hPort to become invalid
// Since Thread.Abort() is unsupported in the CF, we must
// accept that calling Close will throw an error here.
// Close signals the closeEvent, so wait on it
// We wait 1 second, though Close should happen much sooner
int eventResult = CommAPI.WaitForSingleObject(closeEvent, 1000);
if (eventResult == (int)APIConstants.WAIT_OBJECT_0)
{
// the event was set so close was called
hPort = (IntPtr)CommAPI.INVALID_HANDLE_VALUE;
// reset our ResetEvent for the next call to Open
threadStarted.Reset();
return;
}
}
// WaitCommEvent failed!
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
}
catch (Exception e) {
throw e;
}
try {
// Re-specify the set of events to be monitored for the port.
CommAPI.SetCommMask(hPort, CommEventFlags.RXCHAR);
}
catch (Exception e) {
throw e;
}
// check for RXCHAR
if ((eventFlags & CommEventFlags.RXCHAR) != 0)
{
if (DataReceived != null)
{
try {
// data came in, put it in the buffer and set the event
CommAPI.ReadFile(hPort, readbuffer, 1000, ref bytesread);
}
catch (Exception e) {
throw e;
}
if (bytesread >= 1)
{
rxBufferBusy.WaitOne();
try {
// store the byte in out buffer and increment the pointer
Array.Copy(readbuffer, 0, rxBuffer, (int)prxBuffer, (int)bytesread);
prxBuffer += (uint)bytesread;
}
catch (Exception e) {
throw e;
}
finally {
rxBufferBusy.ReleaseMutex();
} {
// prxBuffer gets reset when the Input value is read. (FIFO)
if (DataReceived != null)
{
DataReceived();
}
}
}
}
}
} // while(true)
} // try
catch (Exception e) {
throw e;
}
}
private static extern int CESetCommMask(IntPtr handle, CommEventFlags dwEvtMask);
internal virtual bool WaitCommEvent(IntPtr hPort, ref CommEventFlags flags){return false;}
internal virtual bool SetCommMask(IntPtr hPort, CommEventFlags dwEvtMask)
{
return(false);
}
internal virtual bool WaitCommEvent(IntPtr hPort, ref CommEventFlags flags)
{
return(false);
}
private void CommEventThread()
{
CommEventFlags eventFlags = new CommEventFlags();
byte[] readbuffer = new Byte[rxBufferSize];
int bytesread = 0;
AutoResetEvent rxevent = new AutoResetEvent(false);
// specify the set of events to be monitored for the port.
if(CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
// set up the overlapped IO
OVERLAPPED o = new OVERLAPPED();
rxOverlapped = LocalAlloc(0x40, Marshal.SizeOf(o));
o.Offset = 0;
o.OffsetHigh = 0;
o.hEvent = rxevent.Handle;
Marshal.StructureToPtr(o, rxOverlapped, true);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
try
{
// let Open() know we're started
threadStarted.Set();
#region >>>> thread loop <<<<
while(hPort != (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
// wait for a Comm event
if(!m_CommAPI.WaitCommEvent(hPort, ref eventFlags))
{
int e = Marshal.GetLastWin32Error();
if(e == (int)APIErrors.ERROR_IO_PENDING)
{
// IO pending so just wait and try again
rxevent.WaitOne();
Thread.Sleep(0);
continue;
}
if(e == (int)APIErrors.ERROR_INVALID_HANDLE)
{
// Calling Port.Close() causes hPort to become invalid
// Since Thread.Abort() is unsupported in the CF, we must
// accept that calling Close will throw an error here.
// Close signals the closeEvent, so wait on it
// We wait 1 second, though Close should happen much sooner
int eventResult = m_CommAPI.WaitForSingleObject(closeEvent, 1000);
if(eventResult == (int)APIConstants.WAIT_OBJECT_0)
{
// the event was set so close was called
hPort = (IntPtr)CommAPI.INVALID_HANDLE_VALUE;
// reset our ResetEvent for the next call to Open
threadStarted.Reset();
if(isOpen) // this should not be the case...if so, throw an exception for the owner
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
return;
}
}
// WaitCommEvent failed
// 995 means an exit was requested (thread killed)
if(e == 995)
{
return;
}
else
{
string error = String.Format("Wait Failed: {0}", e);
throw new CommPortException(error);
}
}
// Re-specify the set of events to be monitored for the port.
if(CommAPI.FullFramework)
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
}
else
{
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
// check the event for errors
#region >>>> error checking <<<<
if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
{
CommErrorFlags errorFlags = new CommErrorFlags();
CommStat commStat = new CommStat();
// get the error status
if(!m_CommAPI.ClearCommError(hPort, ref errorFlags, commStat))
{
// ClearCommError failed!
string error = String.Format("ClearCommError Failed: {0}", Marshal.GetLastWin32Error());
throw new CommPortException(error);
}
if(((uint)errorFlags & (uint)CommErrorFlags.BREAK) != 0)
{
// BREAK can set an error, so make sure the BREAK bit is set an continue
eventFlags |= CommEventFlags.BREAK;
}
else
{
// we have an error. Build a meaningful string and throw an exception
StringBuilder s = new StringBuilder("UART Error: ", 80);
if ((errorFlags & CommErrorFlags.FRAME) != 0)
{ s = s.Append("Framing,"); }
if ((errorFlags & CommErrorFlags.IOE) != 0)
{ s = s.Append("IO,"); }
if ((errorFlags & CommErrorFlags.OVERRUN) != 0)
{ s = s.Append("Overrun,"); }
if ((errorFlags & CommErrorFlags.RXOVER) != 0)
{ s = s.Append("Receive Overflow,"); }
if ((errorFlags & CommErrorFlags.RXPARITY) != 0)
{ s = s.Append("Parity,"); }
if ((errorFlags & CommErrorFlags.TXFULL) != 0)
{ s = s.Append("Transmit Overflow,"); }
// no known bits are set
if(s.Length == 12)
{ s = s.Append("Unknown"); }
// raise an error event
if(OnError != null)
OnError(s.ToString());
continue;
}
} // if(((uint)eventFlags & (uint)CommEventFlags.ERR) != 0)
#endregion
#region >>>> Receive data subsection <<<<
// check for RXCHAR
if((eventFlags & CommEventFlags.RXCHAR) != 0)
{
do
{
// make sure the port handle is valid
if(hPort == (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
bytesread = 0;
break;
}
// data came in, put it in the buffer and set the event
if (!m_CommAPI.ReadFile(hPort, readbuffer, rxBufferSize, ref bytesread, rxOverlapped))
{
string errString = String.Format("ReadFile Failed: {0}", Marshal.GetLastWin32Error());
if(OnError != null)
OnError(errString);
return;
}
if (bytesread >= 1)
{
// take the mutex
rxBufferBusy.WaitOne();
// put the data into the fifo
// this *may* be a perf problem and needs testing
for(int b = 0 ; b < bytesread ; b++)
rxFIFO.Enqueue(readbuffer[b]);
// get the FIFO length
int fifoLength = rxFIFO.Count;
// release the mutex
rxBufferBusy.ReleaseMutex();
// fire the DataReceived event every RThreshold bytes
if((DataReceived != null) && (rthreshold != 0) && (fifoLength >= rthreshold))
{
DataReceived();
}
}
} while (bytesread > 0);
} // if((eventFlags & CommEventFlags.RXCHAR) != 0)
#endregion
#region >>>> line status checking <<<<
// check for status changes
uint status = 0;
m_CommAPI.GetCommModemStatus(hPort, ref status);
// check the CTS
if(((uint)eventFlags & (uint)CommEventFlags.CTS) != 0)
{
if(CTSChange != null)
CTSChange((status & (uint)CommModemStatusFlags.MS_CTS_ON) != 0);
}
// check the DSR
if(((uint)eventFlags & (uint)CommEventFlags.DSR) != 0)
{
if(DSRChange != null)
DSRChange((status & (uint)CommModemStatusFlags.MS_DSR_ON) != 0);
}
// check for a RING
if(((uint)eventFlags & (uint)CommEventFlags.RING) != 0)
{
if(RingChange != null)
RingChange((status & (uint)CommModemStatusFlags.MS_RING_ON) != 0);
}
// check for a RLSD
if(((uint)eventFlags & (uint)CommEventFlags.RLSD) != 0)
{
if(RLSDChange != null)
RLSDChange((status & (uint)CommModemStatusFlags.MS_RLSD_ON) != 0);
}
// check for TXEMPTY
if(((uint)eventFlags & (uint)CommEventFlags.TXEMPTY) != 0)
if(TxDone != null) { TxDone(); }
// check for RXFLAG
if(((uint)eventFlags & (uint)CommEventFlags.RXFLAG) != 0)
if(FlagCharReceived != null) { FlagCharReceived(); }
// check for POWER
if(((uint)eventFlags & (uint)CommEventFlags.POWER) != 0)
if(PowerEvent != null) { PowerEvent(); }
// check for high-water state
if((eventFlags & CommEventFlags.RX80FULL) != 0)
if(HighWater != null) { HighWater(); }
#endregion
} // while(true)
#endregion
} // try
catch(Exception e)
{
if(rxOverlapped != IntPtr.Zero)
LocalFree(rxOverlapped);
if(OnError != null)
OnError(e.Message);
return;
}
}
private void CommEventThread() {
CommEventFlags eventFlags = new CommEventFlags();
AutoResetEvent rxevent = new AutoResetEvent(false);
// specify the set of events to be monitored for the port.
bool b;
if(CommAPI.FullFramework) {
b = m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
// set up the overlapped IO
OVERLAPPED o = new OVERLAPPED();
this.mRxOverlapped = LocalAlloc(0x40, Marshal.SizeOf(o));
o.Offset = 0;
o.OffsetHigh = 0;
o.hEvent = rxevent.Handle;
Marshal.StructureToPtr(o, this.mRxOverlapped, true);
}
else {
b = m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE_2);
}
try {
// let Open() know we're started
this.mThreadStarted.Set();
#region >>>> thread loop <<<<
while(hPort != (IntPtr)CommAPI.INVALID_HANDLE_VALUE) {
// wait for a Comm event
if(!m_CommAPI.WaitCommEvent(hPort, ref eventFlags)) {
int e = Marshal.GetLastWin32Error();
if(e == (int)APIErrors.ERROR_IO_PENDING) {
// IO pending so just wait and try again
rxevent.WaitOne();
Thread.Sleep(0);
continue;
}
if(e == (int)APIErrors.ERROR_INVALID_HANDLE) {
// Calling Port.Close() causes hPort to become invalid
// Since Thread.Abort() is unsupported in the CF, we must
// accept that calling Close will throw an error here.
// Close signals the this.mCloseEvent, so wait on it
// We wait 1 second, though Close should happen much sooner
int eventResult = m_CommAPI.WaitForSingleObject(this.mCloseEvent, 1000);
if(eventResult == (int)APIConstants.WAIT_OBJECT_0) {
// the event was set so close was called
hPort = (IntPtr)CommAPI.INVALID_HANDLE_VALUE;
// reset our ResetEvent for the next call to Open
this.mThreadStarted.Reset();
if(this.mIsOpen) { // this should not be the case...if so, throw an exception for the owner
string error = String.Format("Wait Failed: {0}", e);
throw new ApplicationException(error);
}
return;
}
}
// WaitCommEvent failed
// 995 means an exit was requested (thread killed)
if(e == 995) {
return;
}
else {
string error = String.Format("Wait Failed: {0}", e);
throw new ApplicationException(error);
}
}
// Re-specify the set of events to be monitored for the port.
if(CommAPI.FullFramework) {
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLPC);
}
else {
m_CommAPI.SetCommMask(hPort, CommEventFlags.ALLCE);
}
// Process the flag - extracted main handling into its own method
//ThreadPool.QueueUserWorkItem(new WaitCallback(ProcessEvents), eventFlags);
this.ProcessEvents(eventFlags);
} // while(not invalid handle)
#endregion
} // try
catch{
if(this.mRxOverlapped != IntPtr.Zero)
LocalFree(this.mRxOverlapped);
throw;
}
}
/// <summary>
///
/// </summary>
/// <param name="someByteData"></param>
/// <returns></returns>
public int GrabData(byte[] someByteData)
{
bread = 0;
if (isThreaded)
{
Console.WriteLine ("SHOULD NOT BE CALLING THIS BECAUSE NOT DIRECT READ");
}
try
{
grabEventFlags = CommEventFlags.RXCHAR;
isNotPending = false;
while (isNotPending)
{
if(!m_CommAPI.WaitCommEvent(hPort, ref grabEventFlags))
{
int e = Marshal.GetLastWin32Error();
if(e == (int)APIErrors.ERROR_IO_PENDING)
{
// IO pending so just wait and try again
grabRxevent.WaitOne();
Thread.Sleep(0);
isNotPending = false;
}
}
else
isNotPending = true;
}
int tbread = bread;
// make sure the port handle is valid
if(hPort == (IntPtr)CommAPI.INVALID_HANDLE_VALUE)
{
Console.WriteLine ("Invalid port");
bread = 0;
}
// data came in, put it in the buffer and set the event
else if (!m_CommAPI.ReadFile(hPort, grabBytes, rxBufferSize, ref tbread, rxOverlapped))
{
bread = 0;
string errString = String.Format("ReadFile Failed: {0}", Marshal.GetLastWin32Error());
Console.WriteLine ("ERROR: " + errString);
// if(OnError != null)
// OnError(errString);
}
bread = tbread;
if (bread >= 1)
{
//take the mutex
rxBufferBusy.WaitOne();
if (someByteData.Length < grabBytes.Length)
{
Console.WriteLine ("ERROR BUFFER SIZE");
}
// put the data into the fifo
// this *may* be a perf problem and needs testing
for(int b = 0 ; b < bread ; b++)
someByteData[b] = grabBytes[b];
// release the mutex
rxBufferBusy.ReleaseMutex();
}
}
catch(Exception e)
{
Console.WriteLine ("SOME TYPE OF EXCEPTION: " + e.Message);
bread = 0;
}
return bread;
}
internal override bool SetCommMask(IntPtr hPort, CommEventFlags dwEvtMask)
{
return(Convert.ToBoolean(CESetCommMask(hPort, dwEvtMask)));
}
internal override bool WaitCommEvent(IntPtr hPort, ref CommEventFlags flags)
{
return(Convert.ToBoolean(CEWaitCommEvent(hPort, ref flags, IntPtr.Zero)));
}
internal virtual bool SetCommMask(IntPtr hPort, CommEventFlags dwEvtMask) {return false;}
private static extern int CEWaitCommEvent(IntPtr hFile, ref CommEventFlags lpEvtMask, IntPtr lpOverlapped);
override internal bool WaitCommEvent(IntPtr hPort, ref CommEventFlags flags)
{
return Convert.ToBoolean(WinWaitCommEvent(hPort, ref flags, IntPtr.Zero));
}