www.gusucode.com > 串口监视软件源程序，用于监视串口的读写操作（VC++7 > 串口监视软件源程序，用于监视串口的读写操作（VC++7.0版）-/serialport.cpp
/*
Module : SERIALPORT.CPP
Purpose: Implementation for an MFC wrapper class for serial ports
Created: PJN / 31-05-1999
History: PJN / 03-06-1999 1. Fixed problem with code using CancelIo which does not exist on 95.
2. Fixed leaks which can occur in sample app when an exception is thrown
PJN / 16-06-1999 1. Fixed a bug whereby CString::ReleaseBuffer was not being called in
CSerialException::GetErrorMessage
PJN / 29-09-1999 1. Fixed a simple copy and paste bug in CSerialPort::SetDTR
PJN / 08-05-2000 1. Fixed an unreferrenced variable in CSerialPort::GetOverlappedResult in VC 6
PJN / 10-12-2000 1. Made class destructor virtual
PJN / 15-01-2001 1. Attach method now also allows you to specify whether the serial port
is being attached to in overlapped mode
2. Removed some ASSERT's which were unnecessary in some of the functions
3. Updated the Read method which uses OVERLAPPED IO to also return the bytes
read. This allows calls to WriteFile with a 0'ized overlapped structure (This
is required when dealing with TAPI and serial communications)
4. Now includes copyright message in the source code and documentation.
PJN / 24-03-2001 1. Added a BytesWaiting method
PJN / 04-04-2001 1. Provided an overriden version of BytesWaiting which specifies a timeout
PJN / 23-04-2001 1. Fixed a memory leak in DataWaiting method
PJN / 01-05-2002 1. Fixed a problem in Open method which was failing to initialize the DCB
structure incorrectly, when calling GetState. Thanks to Ben Newson for this fix.
PJN / 29-05-2002 1. Fixed an problem where the GetProcAddress for CancelIO was using the
wrong calling convention
PJN / 07-08-2002 1. Changed the declaration of CSerialPort::WaitEvent to be consistent with the
rest of the methods in CSerialPort which can operate in "OVERLAPPED" mode. A note
about the usage of this: If the method succeeds then the overlapped operation
has completed synchronously and there is no need to do a WaitForSingle/Multiple]Object.
If any other unexpected error occurs then a CSerialException will be thrown. See
the implementation of the CSerialPort::DataWaiting which has been rewritten to use
this new design pattern. Thanks to Serhiy Pavlov for spotting this inconsistency.
PJN / 20-09-2002 1. Addition of an additional ASSERT in the internal _OnCompletion function.
2. Addition of an optional out parameter to the Write method which operates in
overlapped mode. Thanks to Kevin Pinkerton for this addition.
Copyright (c) 1996 - 2002 by PJ Naughter. (Web: www.naughter.com, Email: pjna@naughter.com)
All rights reserved.
Copyright / Usage Details:
You are allowed to include the source code in any product (commercial, shareware, freeware or otherwise)
when your product is released in binary form. You are allowed to modify the source code in any way you want
except you cannot modify the copyright details at the top of each module. If you want to distribute source
code with your application, then you are only allowed to distribute versions released by the author. This is
to maintain a single distribution point for the source code.
*/
///////////////////////////////// Includes //////////////////////////////////
#include "stdafx.h"
#include "serialport.h"
#ifndef _WINERROR_
#include "winerror.h"
#endif
///////////////////////////////// defines /////////////////////////////////////
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
//////////////////////////////// Implementation ///////////////////////////////
//Class which handles CancelIo function which must be constructed at run time
//since it is not imeplemented on NT 3.51 or Windows 95. To avoid the loader
//bringing up a message such as "Failed to load due to missing export...", the
//function is constructed using GetProcAddress. The CSerialPort::CancelIo
//function then checks to see if the function pointer is NULL and if it is it
//throws an exception using the error code ERROR_CALL_NOT_IMPLEMENTED which
//is what 95 would have done if it had implemented a stub for it in the first
//place !!
class _SERIAL_PORT_DATA
{
public:
//Constructors /Destructors
_SERIAL_PORT_DATA();
~_SERIAL_PORT_DATA();
HINSTANCE m_hKernel32;
typedef BOOL (WINAPI CANCELIO)(HANDLE);
typedef CANCELIO* LPCANCELIO;
LPCANCELIO m_lpfnCancelIo;
};
_SERIAL_PORT_DATA::_SERIAL_PORT_DATA()
{
m_hKernel32 = LoadLibrary(_T("KERNEL32.DLL"));
VERIFY(m_hKernel32 != NULL);
m_lpfnCancelIo = (LPCANCELIO) GetProcAddress(m_hKernel32, "CancelIo");
}
_SERIAL_PORT_DATA::~_SERIAL_PORT_DATA()
{
FreeLibrary(m_hKernel32);
m_hKernel32 = NULL;
}
//The local variable which handle the function pointers
_SERIAL_PORT_DATA _SerialPortData;
////////// Exception handling code
void AfxThrowSerialException(DWORD dwError /* = 0 */)
{
if (dwError == 0)
dwError = ::GetLastError();
CSerialException* pException = new CSerialException(dwError);
TRACE(_T("Warning: throwing CSerialException for error %d\n"), dwError);
THROW(pException);
}
BOOL CSerialException::GetErrorMessage(LPTSTR pstrError, UINT nMaxError, PUINT pnHelpContext)
{
ASSERT(pstrError != NULL && AfxIsValidString(pstrError, nMaxError));
if (pnHelpContext != NULL)
*pnHelpContext = 0;
LPTSTR lpBuffer;
BOOL bRet = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL, m_dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_SYS_DEFAULT),
(LPTSTR) &lpBuffer, 0, NULL);
if (bRet == FALSE)
*pstrError = '\0';
else
{
lstrcpyn(pstrError, lpBuffer, nMaxError);
bRet = TRUE;
LocalFree(lpBuffer);
}
return bRet;
}
CString CSerialException::GetErrorMessage()
{
CString rVal;
LPTSTR pstrError = rVal.GetBuffer(4096);
GetErrorMessage(pstrError, 4096, NULL);
rVal.ReleaseBuffer();
return rVal;
}
CSerialException::CSerialException(DWORD dwError)
{
m_dwError = dwError;
}
CSerialException::~CSerialException()
{
}
IMPLEMENT_DYNAMIC(CSerialException, CException)
#ifdef _DEBUG
void CSerialException::Dump(CDumpContext& dc) const
{
CObject::Dump(dc);
dc << "m_dwError = " << m_dwError;
}
#endif
////////// The actual serial port code
CSerialPort::CSerialPort()
{
m_hComm = INVALID_HANDLE_VALUE;
m_bOverlapped = FALSE;
m_hEvent = NULL;
}
CSerialPort::~CSerialPort()
{
Close();
}
IMPLEMENT_DYNAMIC(CSerialPort, CObject)
#ifdef _DEBUG
void CSerialPort::Dump(CDumpContext& dc) const
{
CObject::Dump(dc);
dc << _T("m_hComm = ") << m_hComm << _T("\n");
dc << _T("m_bOverlapped = ") << m_bOverlapped;
}
#endif
void CSerialPort::Open(int nPort, DWORD dwBaud, Parity parity, BYTE DataBits, StopBits stopbits, FlowControl fc, BOOL bOverlapped)
{
//Validate our parameters
ASSERT(nPort>0 && nPort<=255);
Close(); //In case we are already open
//Call CreateFile to open up the comms port
CString sPort;
sPort.Format(_T("\\\\.\\COM%d"), nPort);
DWORD dwCreateProperty;
if(bOverlapped)
{
dwCreateProperty=FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED;
}
else
{
dwCreateProperty=FILE_ATTRIBUTE_NORMAL;
}
// bOverlapped ? FILE_FLAG_OVERLAPPED : 0
m_hComm = CreateFile(sPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING,dwCreateProperty, NULL);
if (m_hComm == INVALID_HANDLE_VALUE)
{
TRACE(_T("Failed to open up the comms port\n"));
AfxThrowSerialException();
}
this->m_CurPortNum = nPort;
//Create the event we need for later synchronisation use
/*
if(bOverlapped)
{
m_hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (m_hEvent == NULL)
{
Close();
TRACE(_T("Failed in call to CreateEvent in Open\n"));
AfxThrowSerialException();
}
}
*/
m_bOverlapped = bOverlapped;
//Get the current state prior to changing it
DCB dcb;
dcb.DCBlength = sizeof(DCB);
GetState(dcb);
//Setup the baud rate
dcb.BaudRate = dwBaud;
//Setup the Parity
switch (parity)
{
case EvenParity: dcb.Parity = EVENPARITY; break;
case MarkParity: dcb.Parity = MARKPARITY; break;
case NoParity: dcb.Parity = NOPARITY; break;
case OddParity: dcb.Parity = ODDPARITY; break;
case SpaceParity: dcb.Parity = SPACEPARITY; break;
default: ASSERT(FALSE); break;
}
//Setup the data bits
dcb.ByteSize = DataBits;
//Setup the stop bits
switch (stopbits)
{
case OneStopBit: dcb.StopBits = ONESTOPBIT; break;
case OnePointFiveStopBits: dcb.StopBits = ONE5STOPBITS; break;
case TwoStopBits: dcb.StopBits = TWOSTOPBITS; break;
default: ASSERT(FALSE); break;
}
//Setup the flow control
dcb.fDsrSensitivity = FALSE;
switch (fc)
{
case NoFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case CtsRtsFlowControl:
{
dcb.fOutxCtsFlow = TRUE;
dcb.fOutxDsrFlow = FALSE;
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case CtsDtrFlowControl:
{
dcb.fOutxCtsFlow = TRUE;
dcb.fOutxDsrFlow = FALSE;
dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case DsrRtsFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = TRUE;
dcb.fRtsControl = RTS_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case DsrDtrFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = TRUE;
dcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
dcb.fOutX = FALSE;
dcb.fInX = FALSE;
break;
}
case XonXoffFlowControl:
{
dcb.fOutxCtsFlow = FALSE;
dcb.fOutxDsrFlow = FALSE;
dcb.fOutX = TRUE;
dcb.fInX = TRUE;
dcb.XonChar = 0x11;
dcb.XoffChar = 0x13;
dcb.XoffLim = 100;
dcb.XonLim = 100;
break;
}
default:
{
ASSERT(FALSE);
break;
}
}
//Now that we have all the settings in place, make the changes
SetState(dcb);
}
void CSerialPort::Close()
{
if (IsOpen())
{
//Close down the comms port
BOOL bSuccess = CloseHandle(m_hComm);
m_hComm = INVALID_HANDLE_VALUE;
if (!bSuccess)
TRACE(_T("Failed to close up the comms port, GetLastError:%d\n"), GetLastError());
m_bOverlapped = FALSE;
//Free up the event object we are using
if(m_hEvent)
{
CloseHandle(m_hEvent);
m_hEvent = NULL;
}
}
}
void CSerialPort::Attach(HANDLE hComm, BOOL bOverlapped)
{
Close();
m_hComm = hComm;
m_bOverlapped = bOverlapped;
//Create the event we need for later synchronisation use
m_hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (m_hEvent == NULL)
{
Close();
TRACE(_T("Failed in call to CreateEvent in Attach\n"));
AfxThrowSerialException();
}
}
HANDLE CSerialPort::Detach()
{
HANDLE hrVal = m_hComm;
m_hComm = INVALID_HANDLE_VALUE;
CloseHandle(m_hEvent);
m_hEvent = NULL;
return hrVal;
}
DWORD CSerialPort::Read(void* lpBuf, DWORD dwCount)
{
ASSERT(IsOpen());
ASSERT(!m_bOverlapped);
DWORD Errors;
COMSTAT comstat;
BOOL ok;
ok = ::ClearCommError(this->m_hComm,&Errors,&comstat);
if(!ok)
{
return 0;
}
if(comstat.cbInQue==0)
{
return 0;
}
DWORD dwBytesRead = 0;
if (!ReadFile(m_hComm, lpBuf, comstat.cbInQue, &dwBytesRead, NULL))
{
TRACE(_T("Failed in call to ReadFile\n"));
AfxThrowSerialException();
}
return dwBytesRead;
}
BOOL CSerialPort::Read(void* lpBuf, DWORD dwCount, OVERLAPPED& overlapped, DWORD* pBytesRead)
{
ASSERT(IsOpen());
ASSERT(m_bOverlapped);
DWORD dwBytesRead = 0;
DWORD Errors;
COMSTAT comstat;
/*
BOOL ok;
ok = ::ClearCommError(this->m_hComm,&Errors,&comstat);
if(!ok)
{
return false;
}
if(comstat.cbInQue==0)
{
return false;
}
*/
BOOL bSuccess = ReadFile(m_hComm, lpBuf, dwCount, &dwBytesRead, &overlapped);
if (!bSuccess)
{
if (GetLastError() != ERROR_IO_PENDING)
{
TRACE(_T("Failed in call to ReadFile\n"));
AfxThrowSerialException();
}
}
else
{
if (pBytesRead)
*pBytesRead = dwBytesRead;
}
return bSuccess;
}
DWORD CSerialPort::Write(const void* lpBuf, DWORD dwCount)
{
ASSERT(IsOpen());
ASSERT(!m_bOverlapped);
DWORD dwBytesWritten = 0;
if (!WriteFile(m_hComm, lpBuf, dwCount, &dwBytesWritten, NULL))
{
TRACE(_T("Failed in call to WriteFile\n"));
AfxThrowSerialException();
}
return dwBytesWritten;
}
BOOL CSerialPort::Write(const void* lpBuf, DWORD dwCount, OVERLAPPED& overlapped, DWORD* pBytesWritten)
{
ASSERT(IsOpen());
ASSERT(m_bOverlapped);
DWORD dwBytesWritten = 0;
BOOL bSuccess = WriteFile(m_hComm, lpBuf, dwCount, &dwBytesWritten, &overlapped);
if (!bSuccess)
{
if (GetLastError() != ERROR_IO_PENDING)
{
TRACE(_T("Failed in call to WriteFile\n"));
AfxThrowSerialException();
}
}
else
{
if (pBytesWritten)
*pBytesWritten = dwBytesWritten;
}
return bSuccess;
}
bool CSerialPort::GetOverlappedResult(OVERLAPPED& overlapped, DWORD& dwBytesTransferred, BOOL bWait)
{
ASSERT(IsOpen());
ASSERT(m_bOverlapped);
BOOL bSuccess = ::GetOverlappedResult(m_hComm, &overlapped, &dwBytesTransferred, bWait);
if (!bSuccess)
{
if (GetLastError() != ERROR_IO_PENDING)
{
TRACE(_T("Failed in call to GetOverlappedResult\n"));
AfxThrowSerialException();
}
}
return bSuccess;
}
void CSerialPort::_OnCompletion(DWORD dwErrorCode, DWORD dwCount, LPOVERLAPPED lpOverlapped)
{
//Validate our parameters
ASSERT(lpOverlapped);
//Convert back to the C++ world
CSerialPort* pSerialPort = (CSerialPort*) lpOverlapped->hEvent;
ASSERT(pSerialPort);
ASSERT(pSerialPort->IsKindOf(RUNTIME_CLASS(CSerialPort)));
//Call the C++ function
pSerialPort->OnCompletion(dwErrorCode, dwCount, lpOverlapped);
}
void CSerialPort::OnCompletion(DWORD /*dwErrorCode*/, DWORD /*dwCount*/, LPOVERLAPPED lpOverlapped)
{
//Just free up the memory which was previously allocated for the OVERLAPPED structure
delete lpOverlapped;
//Your derived classes can do something useful in OnCompletion, but don't forget to
//call CSerialPort::OnCompletion to ensure the memory is freed up
}
void CSerialPort::CancelIo()
{
ASSERT(IsOpen());
if (_SerialPortData.m_lpfnCancelIo == NULL)
{
TRACE(_T("CancelIo function is not supported on this OS. You need to be running at least NT 4 or Win 98 to use this function\n"));
AfxThrowSerialException(ERROR_CALL_NOT_IMPLEMENTED);
}
if (!::_SerialPortData.m_lpfnCancelIo(m_hComm))
{
TRACE(_T("Failed in call to CancelIO\n"));
AfxThrowSerialException();
}
}
DWORD CSerialPort::BytesWaiting()
{
ASSERT(IsOpen());
//Check to see how many characters are unread
COMSTAT stat;
GetStatus(stat);
return stat.cbInQue;
}
BOOL CSerialPort::DataWaiting(DWORD dwTimeout)
{
ASSERT(IsOpen());
ASSERT(m_hEvent);
//Setup to wait for incoming data
DWORD dwOldMask;
GetMask(dwOldMask);
SetMask(EV_RXCHAR);
//Setup the overlapped structure
OVERLAPPED o;
o.hEvent = m_hEvent;
//Assume the worst;
BOOL bSuccess = FALSE;
DWORD dwEvent;
bSuccess = WaitEvent(dwEvent, o);
if (!bSuccess)
{
if (WaitForSingleObject(o.hEvent, dwTimeout) == WAIT_OBJECT_0)
{
DWORD dwBytesTransferred;
GetOverlappedResult(o, dwBytesTransferred, FALSE);
bSuccess = TRUE;
}
}
//Reset the event mask
SetMask(dwOldMask);
return bSuccess;
}
void CSerialPort::WriteEx(const void* lpBuf, DWORD dwCount)
{
ASSERT(IsOpen());
OVERLAPPED* pOverlapped = new OVERLAPPED;
ZeroMemory(pOverlapped, sizeof(OVERLAPPED));
pOverlapped->hEvent = (HANDLE) this;
if (!WriteFileEx(m_hComm, lpBuf, dwCount, pOverlapped, _OnCompletion))
{
delete pOverlapped;
TRACE(_T("Failed in call to WriteFileEx\n"));
AfxThrowSerialException();
}
}
void CSerialPort::ReadEx(void* lpBuf, DWORD dwCount)
{
ASSERT(IsOpen());
OVERLAPPED* pOverlapped = new OVERLAPPED;
ZeroMemory(pOverlapped, sizeof(OVERLAPPED));
pOverlapped->hEvent = (HANDLE) this;
if (!ReadFileEx(m_hComm, lpBuf, dwCount, pOverlapped, _OnCompletion))
{
delete pOverlapped;
TRACE(_T("Failed in call to ReadFileEx\n"));
AfxThrowSerialException();
}
}
void CSerialPort::TransmitChar(char cChar)
{
ASSERT(IsOpen());
if (!TransmitCommChar(m_hComm, cChar))
{
TRACE(_T("Failed in call to TransmitCommChar\n"));
AfxThrowSerialException();
}
}
void CSerialPort::GetConfig(COMMCONFIG& config)
{
ASSERT(IsOpen());
DWORD dwSize = sizeof(COMMCONFIG);
if (!GetCommConfig(m_hComm, &config, &dwSize))
{
TRACE(_T("Failed in call to GetCommConfig\n"));
AfxThrowSerialException();
}
}
void CSerialPort::SetConfig(COMMCONFIG& config)
{
ASSERT(IsOpen());
DWORD dwSize = sizeof(COMMCONFIG);
if (!SetCommConfig(m_hComm, &config, dwSize))
{
TRACE(_T("Failed in call to SetCommConfig\n"));
AfxThrowSerialException();
}
}
void CSerialPort::SetBreak()
{
ASSERT(IsOpen());
if (!SetCommBreak(m_hComm))
{
TRACE(_T("Failed in call to SetCommBreak\n"));
AfxThrowSerialException();
}
}
void CSerialPort::ClearBreak()
{
ASSERT(IsOpen());
if (!ClearCommBreak(m_hComm))
{
TRACE(_T("Failed in call to SetCommBreak\n"));
AfxThrowSerialException();
}
}
void CSerialPort::ClearError(DWORD& dwErrors)
{
ASSERT(IsOpen());
if (!ClearCommError(m_hComm, &dwErrors, NULL))
{
TRACE(_T("Failed in call to ClearCommError\n"));
AfxThrowSerialException();
}
}
void CSerialPort::GetDefaultConfig(int nPort, COMMCONFIG& config)
{
//Validate our parameters
ASSERT(nPort>0 && nPort<=255);
//Create the device name as a string
CString sPort;
sPort.Format(_T("COM%d"), nPort);
DWORD dwSize = sizeof(COMMCONFIG);
if (!GetDefaultCommConfig(sPort, &config, &dwSize))
{
TRACE(_T("Failed in call to GetDefaultCommConfig\n"));
AfxThrowSerialException();
}
}
void CSerialPort::SetDefaultConfig(int nPort, COMMCONFIG& config)
{
//Validate our parameters
ASSERT(nPort>0 && nPort<=255);
//Create the device name as a string
CString sPort;
sPort.Format(_T("COM%d"), nPort);
DWORD dwSize = sizeof(COMMCONFIG);
if (!SetDefaultCommConfig(sPort, &config, dwSize))
{
TRACE(_T("Failed in call to GetDefaultCommConfig\n"));
AfxThrowSerialException();
}
}
void CSerialPort::GetStatus(COMSTAT& stat)
{
ASSERT(IsOpen());
DWORD dwErrors;
if (!ClearCommError(m_hComm, &dwErrors, &stat))
{
TRACE(_T("Failed in call to ClearCommError\n"));
AfxThrowSerialException();
}
}
void CSerialPort::GetState(DCB& dcb)
{
ASSERT(IsOpen());
if (!GetCommState(m_hComm, &dcb))
{
TRACE(_T("Failed in call to GetCommState\n"));
AfxThrowSerialException();
}
}
void CSerialPort::SetState(DCB& dcb)
{
ASSERT(IsOpen());
if (!SetCommState(m_hComm, &dcb))
{
TRACE(_T("Failed in call to SetCommState\n"));
AfxThrowSerialException();
}
}
void CSerialPort::Escape(DWORD dwFunc)
{
ASSERT(IsOpen());
if (!EscapeCommFunction(m_hComm, dwFunc))
{
TRACE(_T("Failed in call to EscapeCommFunction\n"));
AfxThrowSerialException();
}
}
void CSerialPort::ClearDTR()
{
Escape(CLRDTR);
}
void CSerialPort::ClearRTS()
{
Escape(CLRRTS);
}
void CSerialPort::SetDTR()
{
Escape(SETDTR);
}
void CSerialPort::SetRTS()
{
Escape(SETRTS);
}
void CSerialPort::SetXOFF()
{
Escape(SETXOFF);
}
void CSerialPort::SetXON()
{
Escape(SETXON);
}
void CSerialPort::GetProperties(COMMPROP& properties)
{
ASSERT(IsOpen());
if (!GetCommProperties(m_hComm, &properties))
{
TRACE(_T("Failed in call to GetCommProperties\n"));
AfxThrowSerialException();
}
}
void CSerialPort::GetModemStatus(DWORD& dwModemStatus)
{
ASSERT(IsOpen());
if (!GetCommModemStatus(m_hComm, &dwModemStatus))
{
TRACE(_T("Failed in call to GetCommModemStatus\n"));
AfxThrowSerialException();
}
}
void CSerialPort::SetMask(DWORD dwMask)
{
ASSERT(IsOpen());
if (!SetCommMask(m_hComm, dwMask))
{
TRACE(_T("Failed in call to SetCommMask\n"));
AfxThrowSerialException();
}
}
void CSerialPort::GetMask(DWORD& dwMask)
{
ASSERT(IsOpen());
if (!GetCommMask(m_hComm, &dwMask))
{
TRACE(_T("Failed in call to GetCommMask\n"));
AfxThrowSerialException();
}
}
void CSerialPort::Flush()
{
ASSERT(IsOpen());
if (!FlushFileBuffers(m_hComm))
{
TRACE(_T("Failed in call to FlushFileBuffers\n"));
AfxThrowSerialException();
}
}
void CSerialPort::Purge(DWORD dwFlags)
{
ASSERT(IsOpen());
if (!PurgeComm(m_hComm, dwFlags))
{
TRACE(_T("Failed in call to PurgeComm\n"));
AfxThrowSerialException();
}
}
void CSerialPort::TerminateOutstandingWrites()
{
Purge(PURGE_TXABORT);
}
void CSerialPort::TerminateOutstandingReads()
{
Purge(PURGE_RXABORT);
}
void CSerialPort::ClearWriteBuffer()
{
Purge(PURGE_TXCLEAR);
}
void CSerialPort::ClearReadBuffer()
{
Purge(PURGE_RXCLEAR);
}
void CSerialPort::Setup(DWORD dwInQueue, DWORD dwOutQueue)
{
ASSERT(IsOpen());
if (!SetupComm(m_hComm, dwInQueue, dwOutQueue))
{
TRACE(_T("Failed in call to SetupComm\n"));
AfxThrowSerialException();
}
}
void CSerialPort::SetTimeouts(COMMTIMEOUTS& timeouts)
{
ASSERT(IsOpen());
if (!SetCommTimeouts(m_hComm, &timeouts))
{
TRACE(_T("Failed in call to SetCommTimeouts\n"));
AfxThrowSerialException();
}
}
void CSerialPort::GetTimeouts(COMMTIMEOUTS& timeouts)
{
ASSERT(IsOpen());
if (!GetCommTimeouts(m_hComm, &timeouts))
{
TRACE(_T("Failed in call to GetCommTimeouts\n"));
AfxThrowSerialException();
}
}
void CSerialPort::Set0Timeout()
{
COMMTIMEOUTS Timeouts;
ZeroMemory(&Timeouts, sizeof(COMMTIMEOUTS));
Timeouts.ReadIntervalTimeout = MAXDWORD;
SetTimeouts(Timeouts);
}
void CSerialPort::Set0WriteTimeout()
{
COMMTIMEOUTS Timeouts;
GetTimeouts(Timeouts);
Timeouts.WriteTotalTimeoutMultiplier = 0;
Timeouts.WriteTotalTimeoutConstant = 0;
SetTimeouts(Timeouts);
}
void CSerialPort::Set0ReadTimeout()
{
COMMTIMEOUTS Timeouts;
GetTimeouts(Timeouts);
Timeouts.ReadIntervalTimeout = MAXDWORD;
Timeouts.ReadTotalTimeoutMultiplier = 0;
Timeouts.ReadTotalTimeoutConstant = 0;
SetTimeouts(Timeouts);
}
bool CSerialPort::WaitEvent(DWORD& dwMask)
{
ASSERT(IsOpen());
ASSERT(!m_bOverlapped);
if (!WaitCommEvent(m_hComm, &dwMask, NULL))
{
TRACE(_T("Failed in call to WaitCommEvent\n"));
//AfxThrowSerialException();
return false;
}
else
return true;
}
BOOL CSerialPort::WaitEvent(DWORD& dwMask, OVERLAPPED& overlapped)
{
ASSERT(IsOpen());
ASSERT(m_bOverlapped);
ASSERT(overlapped.hEvent);
BOOL bSuccess = WaitCommEvent(m_hComm, &dwMask, &overlapped);
if (!bSuccess)
{
if (GetLastError() != ERROR_IO_PENDING)
{
TRACE(_T("Failed in call to WaitCommEvent\n"));
//AfxThrowSerialException();
}
}
return bSuccess;
}