我试图编写一个基于MFC对话框的应用程序，该程序从PC的串行COMM端口读取信息，然后将一些信息写回到串行COMM端口。关于我从哪里开始的任何想法？
提前致谢。
最佳答案
这有帮助吗？ :-)
/* /////////////////// Macros / Structs etc ////////////////////////// */
#ifndef __SERIALPORT_H__
#define __SERIALPORT_H__
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <vector>
/* ///////////////////////// Classes /////////////////////////////////////////// */
/* //// Serial port exception class //////////////////////////////////////////// */
void AfxThrowSerialException(DWORD dwError = 0);
class CSerialException : public CException
{
public:
/* Constructors / Destructors */
CSerialException (DWORD dwError);
~CSerialException ();
/* Methods */
#ifdef _DEBUG
virtual void Dump(CDumpContext & dc) const;
#endif
virtual BOOL GetErrorMessage(LPTSTR lpstrError, UINT nMaxError, PUINT pnHelpContext = NULL);
CString GetErrorMessage();
/* Data members */
DWORD m_dwError;
protected:
DECLARE_DYNAMIC(CSerialException)
};
/* // The actual serial port class ///////////////////////////////////////////// */
class CSerialPort : public CObject
{
public:
/* Enums */
enum FlowControl {
NoFlowControl,
CtsRtsFlowControl,
CtsDtrFlowControl,
DsrRtsFlowControl,
DsrDtrFlowControl,
XonXoffFlowControl
};
enum Parity {
EvenParity,
MarkParity,
NoParity,
OddParity,
SpaceParity
};
enum StopBits {
OneStopBit,
OnePointFiveStopBits,
TwoStopBits
};
/* Constructors / Destructors */
CSerialPort ();
~CSerialPort ();
/* General Methods */
static std::vector<CString> EnumSerialPorts( void );
void Open(int nPort, DWORD dwBaud = 9600, Parity parity = NoParity, BYTE dataBits = 8,
StopBits stopBits = OneStopBit, FlowControl fc = NoFlowControl, BOOL bOverlapped = FALSE);
void Open(LPCTSTR szPort, DWORD dwBaud = 9600, Parity parity = NoParity, BYTE dataBits = 8,
StopBits stopBits = OneStopBit, FlowControl fc = NoFlowControl, BOOL bOverlapped = FALSE);
void Close();
void Attach(HANDLE hComm);
HANDLE Detach();
operator HANDLE() const { return m_hComm; }
BOOL IsOpen() const { return m_hComm != INVALID_HANDLE_VALUE; }
#ifdef _DEBUG
void CSerialPort::Dump(CDumpContext & dc) const;
#endif
/* Reading / Writing Methods */
DWORD Read(void *lpBuf, DWORD dwCount);
BOOL Read(void *lpBuf, DWORD dwCount, OVERLAPPED &overlapped);
void ReadEx(void *lpBuf, DWORD dwCount);
DWORD Write(const void *lpBuf, DWORD dwCount);
BOOL Write(const void *lpBuf, DWORD dwCount, OVERLAPPED &overlapped);
void WriteEx(const void *lpBuf, DWORD dwCount);
void TransmitChar(char cChar);
void GetOverlappedResult(OVERLAPPED & overlapped,
DWORD & dwBytesTransferred,
BOOL bWait);
void CancelIo();
/* Configuration Methods */
void GetConfig(COMMCONFIG & config);
static void GetDefaultConfig(int nPort, COMMCONFIG & config);
void SetConfig(COMMCONFIG & Config);
static void SetDefaultConfig(int nPort, COMMCONFIG & config);
/* Misc RS232 Methods */
void ClearBreak();
void SetBreak();
void ClearError(DWORD & dwErrors);
void GetStatus(COMSTAT & stat);
void GetState(DCB & dcb);
void SetState(DCB & dcb, BOOL bClosePortOnErr = FALSE);
void Escape(DWORD dwFunc);
void ClearDTR();
void ClearRTS();
void SetDTR();
void SetRTS();
void SetXOFF();
void SetXON();
void GetProperties(COMMPROP & properties);
void GetModemStatus(DWORD & dwModemStatus);
/* Timeouts */
void SetTimeouts(const COMMTIMEOUTS& timeouts);
void GetTimeouts(COMMTIMEOUTS& timeouts);
void Set0Timeout();
void Set0WriteTimeout();
void Set0ReadTimeout();
/* Event Methods */
void SetMask(DWORD dwMask);
void GetMask(DWORD & dwMask);
void WaitEvent(DWORD & dwMask);
void WaitEvent(DWORD & dwMask, OVERLAPPED & overlapped);
/* Queue Methods */
void Flush();
void Purge(DWORD dwFlags);
void TerminateOutstandingWrites();
void TerminateOutstandingReads();
void ClearWriteBuffer();
void ClearReadBuffer();
void Setup(DWORD dwInQueue, DWORD dwOutQueue);
/* Overridables */
virtual void OnCompletion(DWORD dwErrorCode, DWORD dwCount, LPOVERLAPPED lpOverlapped);
protected:
HANDLE m_hComm; /* Handle to the comms port */
BOOL m_bOverlapped; /* Is the port open in overlapped IO */
static void WINAPI _OnCompletion(DWORD dwErrorCode, DWORD dwCount, LPOVERLAPPED lpOverlapped);
DECLARE_DYNAMIC(CSerialPort)
private:
void OpenComm(LPCTSTR szPort, DWORD dwBaud = 9600, Parity parity = NoParity, BYTE dataBits = 8,
StopBits stopBits = OneStopBit, FlowControl fc = NoFlowControl, BOOL bOverlapped = FALSE);
};
#endif /* __SERIALPORT_H__ */
/* /////////////////////////////// Includes ////////////////////////////////// */
#include "stdafx.h"
#include <winspool.h>
#include "serialport.h"
#include "winerror.h"
/* /////////////////////////////// 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 ( 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;
} /* GetErrorMessage */
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;
}
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
std::vector<CString> CSerialPort::EnumSerialPorts(void)
{
/* Clear existing list of COMM ports */
std::vector<CString> commPortList;
/* COM ports can be numbered from 1 to 255, loop through all possibilities and add the ones we
* find.
*/
for( UINT i = 1; i < 256; i++ ) {
//Form the Raw device name
CString sPort;
sPort.Format( _T("COM%d"), i );
COMMCONFIG cc;
DWORD dwSize = sizeof(cc);
if( GetDefaultCommConfig(sPort, &cc, &dwSize) != 0 ) {
commPortList.push_back( (LPCTSTR)sPort );
}
}
return commPortList;
}
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);
/* Call CreateFile to open up the comms port */
CString sPort;
sPort.Format(_T("\\\\.\\COM%d"), nPort);
OpenComm(sPort, dwBaud, parity, dataBits, stopBits, fc, bOverlapped);
}
void CSerialPort::Open(LPCTSTR szPort, DWORD dwBaud, Parity parity, BYTE dataBits, StopBits stopBits,
FlowControl fc, BOOL bOverlapped)
{
OpenComm(szPort, dwBaud, parity, dataBits, stopBits, fc, bOverlapped);
}
void CSerialPort::OpenComm(LPCTSTR szPort, DWORD dwBaud, Parity parity, BYTE dataBits, StopBits stopbits,
FlowControl fc, BOOL bOverlapped)
{
m_hComm = CreateFile(szPort, (GENERIC_READ | GENERIC_WRITE), 0, NULL, OPEN_EXISTING,
bOverlapped ? FILE_FLAG_OVERLAPPED : 0, NULL);
if(m_hComm == INVALID_HANDLE_VALUE) {
TRACE( _T("Failed to open up the comms port\n") );
AfxThrowSerialException();
}
m_bOverlapped = bOverlapped;
/* Get the current state prior to changing it */
DCB 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);
} /* Open */
void CSerialPort::Close()
{
if( IsOpen() ) {
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;
}
}
void CSerialPort::Attach(HANDLE hComm)
{
Close();
m_hComm = hComm;
}
HANDLE CSerialPort::Detach()
{
HANDLE hrVal = m_hComm;
m_hComm = INVALID_HANDLE_VALUE;
return hrVal;
}
DWORD CSerialPort::Read(void *lpBuf, DWORD dwCount)
{
ASSERT( IsOpen() );
ASSERT(!m_bOverlapped);
DWORD dwBytesRead = 0;
if( !ReadFile(m_hComm, lpBuf, dwCount, &dwBytesRead, NULL) ) {
TRACE( _T("Failed in call to ReadFile\n") );
AfxThrowSerialException();
}
return dwBytesRead;
}
BOOL CSerialPort::Read(void *lpBuf, DWORD dwCount, OVERLAPPED & overlapped)
{
ASSERT( IsOpen() );
ASSERT(m_bOverlapped);
ASSERT(overlapped.hEvent);
DWORD dwBytesRead = 0;
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();
}
}
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)
{
ASSERT( IsOpen() );
ASSERT(m_bOverlapped);
ASSERT(overlapped.hEvent);
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();
}
}
return bSuccess;
}
void CSerialPort::GetOverlappedResult(OVERLAPPED & overlapped,
DWORD & dwBytesTransferred,
BOOL bWait)
{
ASSERT( IsOpen() );
ASSERT(m_bOverlapped);
ASSERT(overlapped.hEvent);
//DWORD dwBytesWritten = 0;
if( !::GetOverlappedResult(m_hComm, &overlapped, &dwBytesTransferred, bWait) ) {
if(GetLastError() != ERROR_IO_PENDING) {
TRACE( _T("Failed in call to GetOverlappedResult\n") );
AfxThrowSerialException();
}
}
}
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->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();
}
}
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, BOOL bClosePortOnErr)
{
ASSERT( IsOpen() );
if( !SetCommState(m_hComm, &dcb) ) {
if( bClosePortOnErr == TRUE ) {
Close();
}
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(const COMMTIMEOUTS& timeouts)
{
ASSERT( IsOpen() );
if( !SetCommTimeouts(m_hComm, (LPCOMMTIMEOUTS)&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;
Timeouts.ReadTotalTimeoutMultiplier = 0;
Timeouts.ReadTotalTimeoutConstant = 0;
Timeouts.WriteTotalTimeoutMultiplier = 0;
Timeouts.WriteTotalTimeoutConstant = 0;
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);
}
void CSerialPort::WaitEvent(DWORD & dwMask)
{
ASSERT( IsOpen() );
ASSERT(!m_bOverlapped);
if( !WaitCommEvent(m_hComm, &dwMask, NULL) ) {
TRACE( _T("Failed in call to WaitCommEvent\n") );
AfxThrowSerialException();
}
}
void CSerialPort::WaitEvent(DWORD & dwMask, OVERLAPPED & overlapped)
{
ASSERT( IsOpen() );
ASSERT(m_bOverlapped);
ASSERT(overlapped.hEvent);
if( !WaitCommEvent(m_hComm, &dwMask, &overlapped) ) {
if(GetLastError() != ERROR_IO_PENDING) {
TRACE( _T("Failed in call to WaitCommEvent\n") );
AfxThrowSerialException();
}
}
}
关于c++ - 从串行端口MFC读取信息，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/7095569/