自学教程：C++ GetCommModemStatus函数代码示例

unsigned int WINAPI mthread(void *t){  DWORD mask = 0;  register CComm *cm = (CComm *)t;  GetCommModemStatus(cm->h,&cm->mstat);  cm->status=1;  while(1){     if(!WaitCommEvent(cm->h,&mask,&cm->ovr) ) {         DWORD e=GetLastError();         if( e == ERROR_IO_PENDING ) {            DWORD r;            if( !GetOverlappedResult(cm->h,&cm->ovr,&r,TRUE) ) {               throw errors("GetOverlappedResult failed");               break;            }         } else {            throw errors("WaitCommEvent failed");            break;         }     }     if( mask == 0 ) {         break;     }     if( mask & EV_RXCHAR) {         char buf[10];         DWORD read;         do {            read = 0;            if( !ReadFile(cm->h,buf,sizeof(buf),&read,&cm->ovr) ) {               if( GetLastError() == ERROR_IO_PENDING ){                  if( !GetOverlappedResult(cm->h,&cm->ovr,&read,TRUE)){                     throw errors("GetOverlappedResult failed");                     break;                  }               } else {                  throw errors("ReadFile failed");                  break;               }            }            if(read){              cm->receive(buf,read);            }         } while(read);     }     if( mask & EV_TXEMPTY) {       SetEvent(cm->txenable);     }     if ( mask & (EV_RLSD|EV_DSR|EV_CTS)) {       GetCommModemStatus(cm->h,&cm->mstat);       cm->status=1;     }     mask = 0;  }  CloseHandle(cm->ovr.hEvent);  CloseHandle(cm->h);cm->h=NULL;  return 0;}

/*!/fn ulong Win_QextSerialPort::lineStatus(void)returns the line status as stored by the port function.  This function will retrieve the statesof the following lines: DCD, CTS, DSR, and RI.  On POSIX systems, the following additional linescan be monitored: DTR, RTS, Secondary TXD, and Secondary RXD.  The value returned is an unsignedlong with specific bits indicating which lines are high.  The following constants should be usedto examine the states of individual lines:/verbatimMask        Line------      ----LS_CTS      CTSLS_DSR      DSRLS_DCD      DCDLS_RI       RI/endverbatimThis function will return 0 if the port associated with the class is not currently open.*/ulong Win_QextSerialPort::lineStatus(void) {    unsigned long status = 0;    unsigned long temp = 0;    LOCK_MUTEX();    if (isOpen())     {        GetCommModemStatus(m_WinHandle, &temp);        if (temp&MS_CTS_ON)         {            status|=LS_CTS;        }        if (temp&MS_DSR_ON)         {            status|=LS_DSR;        }        if (temp&MS_RING_ON)         {            status|=LS_RI;        }        if (temp&MS_RLSD_ON)         {            status|=LS_DCD;        }    }    UNLOCK_MUTEX();    return status;}

static int fb_hSerialWaitSignal( HANDLE hDevice, DWORD dwMask, DWORD dwResult, DWORD dwTimeout ){    DWORD dwStartTime = GET_MSEC_TIME();    DWORD dwModemStatus = 0;    if( !GetCommModemStatus( hDevice, &dwModemStatus ) )        return FALSE;    while ( ((GET_MSEC_TIME() - dwStartTime) <= dwTimeout)            && ((dwModemStatus & dwMask)!=dwResult) )    {        if( !GetCommModemStatus( hDevice, &dwModemStatus ) )            return FALSE;    }    return ((dwModemStatus & dwMask)==dwResult);}

int ndiSerialCheckDSR(HANDLE serial_port){  DWORD bits;  /* get the bits to see if DSR is set (i.e. if device is connected) */  GetCommModemStatus(serial_port, &bits);  return ((bits & MS_DSR_ON) != 0);}

void Tserial_event::OnEvent (unsigned long events){	unsigned long ModemStat;	GetCommModemStatus(serial_handle, &ModemStat);	if ((events & EV_RING)!=0)	{		if ((ModemStat &  MS_RING_ON)!= 0)		{			if (manager!=0)				manager((uint32) this, SERIAL_RING);		}	}	if ((events & EV_RLSD)!=0)	{		if ((ModemStat &  MS_RLSD_ON)!= 0)		{			if (manager!=0)				manager((uint32) this, SERIAL_CD_ON);		}		else		{			if (manager!=0)				manager((uint32) this, SERIAL_CD_OFF);		}	}}

DWORD SerialPort::ThreadProc (LPVOID lpdwThreadParam ) {    SerialPort *port =  (SerialPort *)lpdwThreadParam;    HANDLE hCOM = port->get_com();    DWORD read;    const int buffSize = 1024;    char buff[buffSize];    while (true) {        read = 0;        bool res = ReadFile(hCOM, buff, buffSize, &read,0);        if(!port->mTreadFlag)        	break;        if(res) {            if(read > 0) {                port->mReadError = false;                buff[read]='/0';                SerialPortRecieved(port, buff, read);                port->mBytesRecivedSinceLastSend += read;            } else {                if(GetCommModemStatus(hCOM, &read)==0) {                    if(port->mReadError == false)                        SerialPortError(port, ERROR_READ_STRING);                    port->mReadError = true;                } else {                    port->mReadError = false;                }                port->sleep(100);            }        } else {            port->mReadError = true;            SerialPortError(port, ERROR_READ_STRING);            port->sleep(100);        }    }    return 0;}

extern "C" __declspec (dllexport) bool SerialGate::GetLine(IN_LINES_NAME ln){	if(!state)		return 0;	unsigned long ul = 0;	GetCommModemStatus(m_hFile, &ul);			if(ul == 0x10 && ln == CTS)	{		return true;	}	if(ul == 0x20 && ln == DSR)	{		return true;		}	if(ul == 0x40 && ln == RING)	{		return true;	}	if(ul == 0x80 && ln == RLSD)	{		return true;	}			return false;}

COMPort::MSPack COMPort::getModemSignals() const {	MSPack aPack;	if ( !GetCommModemStatus ( (HANDLE)portHandle, (LPDWORD)&aPack ) ) {	}	return aPack;}

static int gry_probe(CableHandle *h){	DWORD status;			//MS_CTS_ON or MS_DTR_ON	EscapeCommFunction(hCom, SETDTR);	EscapeCommFunction(hCom, SETRTS);	GetCommModemStatus(hCom, &status);	// Get MCR values	if (status != 0x20)	{		return ERR_PROBE_FAILED;	}	EscapeCommFunction(hCom, SETDTR);	EscapeCommFunction(hCom, CLRRTS);	GetCommModemStatus(hCom, &status);	if (status != 0x20)	{		return ERR_PROBE_FAILED;	}	EscapeCommFunction(hCom, CLRDTR);	EscapeCommFunction(hCom, CLRRTS);	GetCommModemStatus(hCom, &status);	if (status != 0x00)	{		return ERR_PROBE_FAILED;	}	EscapeCommFunction(hCom, CLRDTR);	EscapeCommFunction(hCom, SETRTS);	GetCommModemStatus(hCom, &status);	if (status != 0x00)	{		return ERR_PROBE_FAILED;	}	EscapeCommFunction(hCom, SETDTR);	EscapeCommFunction(hCom, SETRTS);	GetCommModemStatus(hCom, &status);	if (status != 0x20)	{		return ERR_PROBE_FAILED;	}	return 0;}

int RS232_IsDSREnabled(int comport_number){  int status;  GetCommModemStatus(Cport[comport_number], (LPDWORD)((void *)&status));  if(status&MS_DSR_ON) return(1);  else return(0);}

int IsCTSEnabled(){  int status;  GetCommModemStatus(Cport, (LPDWORD)((void *)&status));  if(status&MS_CTS_ON) return(1);  else return(0);}

int comGetModemStatus(COM_HANDLE handle){	DWORD status=0;		if(GetCommModemStatus(handle, &status))		return status;	else		return COM_ERROR;}

/*------------------------------------------------------------------------------ FUNCTION NAME: Uart_CTSReady DESCRIPTION: Checks CTS ready PARAMETERS:   - INPUT:     - NumChann (int): Port to check   - OUTPUT: RETURN: TRUE  - CTS 1         FALSE - CTS 0 NOTES:------------------------------------------------------------------------------*/t_boolean Uart_CTSReady (int NumChann){HANDLE hPort = GetPortHandle ( NumChann );DWORD  ModemStat;  GetCommModemStatus (hPort, &ModemStat);  return (t_boolean) (MS_CTS_ON & ModemStat);} /* Uart_CTSReady */

void CSerialPort::GetModemStatus(DWORD& dwModemStatus){  ASSERT(IsOpen());  if (!GetCommModemStatus(m_hComm, &dwModemStatus))  {    TRACE(_T("Failed in call to GetCommModemStatus/n"));    AfxThrowSerialException();  }}

void CSerialServer::CheckModemStatus(BOOL bUpdateNow){    if (!GetCommModemStatus(m_hComPort, &m_dwModemStatus))        XDEBUG("GetCommModemStatus Error/r/n");    // Report status if bUpdateNow is true or status has changed    if (bUpdateNow || (m_dwModemStatus != m_dwOldModemStatus))        OnUpdateModemStatus(m_dwModemStatus);    m_dwOldModemStatus = m_dwModemStatus;}

BOOL CSerialPort::GetDSR(){  DWORD result =0;  if (!GetCommModemStatus(m_hComm, &result))  {    TRACE(_T("Failed in call to EscapeCommFunction/n"));    AfxThrowSerialException();  }  return result&MS_DSR_ON?1:0;}

static int SerialPort_getLineStatus(GORILLA_METHOD_PARAMETERS) {    HANDLE win32Handle;    int status;        win32Handle = SerialPort_property__win32Handle_entity(GORILLA_METHOD_PARAM_PASSTHRU);    if (GetCommModemStatus(win32Handle, (LPDWORD)&status) == FALSE) {        zend_throw_exception(NULL, "failed to get line status", 641 TSRMLS_CC);        return 0;    }        return status;}

serial_raw::serial_raw(const char *devname){#ifdef WIN32  char portstr[MAX_PATH];#ifdef WIN32_RECEIVE_RAW  DWORD threadID;#endif#endif  put ("SERR");  settype (SERRLOG);#ifdef WIN32  memset(&dcb, 0, sizeof(DCB));  dcb.DCBlength = sizeof(DCB);  dcb.fBinary = 1;  dcb.fDtrControl = DTR_CONTROL_ENABLE;  dcb.fRtsControl = RTS_CONTROL_ENABLE;  dcb.Parity = NOPARITY;  dcb.ByteSize = 8;  dcb.StopBits = ONESTOPBIT;  dcb.BaudRate = CBR_115200;  DCBchanged = FALSE;  if (lstrlen(devname) > 0) {    wsprintf(portstr, "////.//%s", devname);    hCOM = CreateFile(portstr, GENERIC_READ|GENERIC_WRITE, 0, NULL,                      OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);    if (hCOM != INVALID_HANDLE_VALUE) {      present = 1;      GetCommModemStatus(hCOM, &MSR_value);      SetupComm(hCOM, 8192, 2048);      PurgeComm(hCOM, PURGE_TXABORT | PURGE_RXABORT |                PURGE_TXCLEAR | PURGE_RXCLEAR);#ifdef WIN32_RECEIVE_RAW      SetCommMask(hCOM, EV_BREAK | EV_CTS | EV_DSR | EV_ERR | EV_RING | EV_RLSD | EV_RXCHAR);      memset(&rx_ovl, 0, sizeof(OVERLAPPED));      rx_ovl.hEvent = CreateEvent(NULL,TRUE,FALSE,"receive");      hRawSerialThread = CreateThread(NULL, 0, RawSerialThread, this, 0, &threadID);#endif    } else {      present = 0;      BX_ERROR(("Raw device '%s' not present", devname));    }  } else {    present = 0;  }#else  present = 0;#endif  set_modem_control(0x00);  set_break(0);  rxdata_count = 0;}

void EIO_Get(uv_work_t* req) {  GetBaton* data = static_cast<GetBaton*>(req->data);  DWORD bits = 0;  if (!GetCommModemStatus((HANDLE)data->fd, &bits)) {    ErrorCodeToString("Getting control settings on COM port (GetCommModemStatus)", GetLastError(), data->errorString);    return;  }  data->cts = bits & MS_CTS_ON;  data->dsr = bits & MS_DSR_ON;  data->dcd = bits & MS_RLSD_ON;}

AREXPORT bool ArSerialConnection::getRing(void){  DWORD modemStat;  if (GetCommModemStatus(myPort, &modemStat))  {    return (bool) (modemStat & MS_RING_ON);  }  else  {    fprintf(stderr, "problem with GetCommModemStatus/n");    return false;  }}

MX_EXPORT mx_status_typemxi_win32com_get_signal_state( MX_RS232 *rs232 ){	static const char fname[] = "mxi_win32com_get_signal_state()";	MX_WIN32COM *win32com;	DWORD modem_status;	BOOL status;	MX_DEBUG(-2,("%s invoked for record '%s'.",			fname, rs232->record->name ));	win32com = (MX_WIN32COM *) rs232->record->record_type_struct;	rs232->signal_state &= ~ MXF_WIN32COM_SIGNAL_READ_MASK;	status = GetCommModemStatus( win32com->handle, &modem_status );	if ( status == 0 ) {		DWORD last_error_code;		TCHAR message_buffer[MXU_ERROR_MESSAGE_LENGTH - 120];		last_error_code = GetLastError();		mx_win32_error_message( last_error_code,			message_buffer, sizeof(message_buffer) );		return mx_error( MXE_INTERFACE_IO_ERROR, fname,			"Error getting RS-232 signal status from "			"WIN32COM port '%s'.  "			"Win32 error code = %ld, error message = '%s'",			win32com->filename, last_error_code, message_buffer );	}	win32com->modem_status = (unsigned long) modem_status;	if ( modem_status & MS_CTS_ON ) {		rs232->signal_state |= MXF_232_CLEAR_TO_SEND;	}	if ( modem_status & MS_DSR_ON ) {		rs232->signal_state |= MXF_232_DATA_SET_READY;	}	if ( modem_status & MS_RING_ON ) {		rs232->signal_state |= MXF_232_RING_INDICATOR;	}	if ( modem_status & MS_RLSD_ON ) {		rs232->signal_state |= MXF_232_DATA_CARRIER_DETECT;	}	return MX_SUCCESSFUL_RESULT;}

void CDirectSerial::updateMSR () {	DWORD dptr = 0;	if (!GetCommModemStatus (hCom, &dptr)) {#ifdef SERIALPORT_DEBUGMSG//		LOG_MSG ("Serial port at %x: GetCommModemStatus failed!", base);#endif		//return;	}	setCTS((dptr & MS_CTS_ON)!=0);	setDSR((dptr & MS_DSR_ON)!=0);	setRI ((dptr & MS_RING_ON)!=0);	setCD((dptr & MS_RLSD_ON)!=0);}

/* see knowledge base Q101417 */static void COMM_MSRUpdate( HANDLE handle, UCHAR * pMsr ){    UCHAR tmpmsr=0;    DWORD mstat=0;    if(!GetCommModemStatus(handle,&mstat))        return;    if(mstat & MS_CTS_ON) tmpmsr |= MSR_CTS;    if(mstat & MS_DSR_ON) tmpmsr |= MSR_DSR;    if(mstat & MS_RING_ON) tmpmsr |= MSR_RI;    if(mstat & MS_RLSD_ON) tmpmsr |= MSR_RLSD;    *pMsr = (*pMsr & ~MSR_MASK) | tmpmsr;}

int sp_get_pin(enum SP_PIN pin) {	int s;#if IS_WINDOWS	DWORD ctl;	s = (pin == PIN_CTS) ? MS_CTS_ON : MS_DSR_ON;	GetCommModemStatus(sp_fd, &ctl);#else	int ctl;	s = (pin == PIN_CTS) ? TIOCM_CTS : TIOCM_DSR;	ioctl(sp_fd, TIOCMGET, &ctl);#endif	return ((ctl & s) ? 1 : 0);}

int xbee_ser_get_cts( xbee_serial_t *serial){	DWORD	dwModemStatus;	XBEE_SER_CHECK( serial);	if (!GetCommModemStatus( serial->hCom, &dwModemStatus))	{		#ifdef XBEE_SERIAL_VERBOSE			printf( "%s: GetCommModemStatus error %lu/n", __FUNCTION__,					GetLastError());		#endif		return -EIO;	}	return (dwModemStatus & MS_CTS_ON) ? 1 : 0;}

BOOL    COM_ModemStatus( int item, DWORD *stat ){BOOL    ok=TRUE;    if( !GetCommModemStatus(COM_Item[item].comH,stat) )    {        COM_errorf("COM_ModemStatus(COM%d) GetCommModemStatus() Failed (%s)./n",COM_Item[item].comX,COM_Error());        ok = FALSE;    }    else    {        COM_debugf("COM_ModemStatus(COM%d) [%08lX] %s./n",COM_Item[item].comX,*stat,STR_TextFlag(COM_ModemStatusText,*stat));    }    return(ok);}

void _USERENTRY SerialStatusT(void *A)	{	SerialPortC *SP = (SerialPortC *) A;	while (!SP->Closed)		{		Sleep(1000);		WaitForSingleObject(SP->RMutex, INFINITE);		if (!SP->Closed)			{			GetCommModemStatus(SP->hDev, &SP->ModemStatus);			}		ReleaseMutex(SP->RMutex);		}	}

VALUE lineStatusIO(VALUE self){    PortDescriptor *port = NULL;    Data_Get_Struct(self, PortDescriptor, port);    unsigned long Status = 0, Temp = 0;    GetCommModemStatus(port->fd, &Temp);    if (Temp & MS_CTS_ON) Status |= LS_CTS;    if (Temp & MS_DSR_ON) Status |= LS_DSR;    if (Temp & MS_RING_ON) Status |= LS_RI;    if (Temp & MS_RLSD_ON) Status |= LS_DCD;    return LONG2FIX(Status);}

BOOL CSerialPort::Get_RI_State()  {     if (m_PortHandle != INVALID_HANDLE_VALUE)      {        DWORD ModemStat;        if (GetCommModemStatus(m_PortHandle, &ModemStat))          {            return (ModemStat & MS_RING_ON) > 0;          }        else           {            return FALSE;          }      }    else       {        return FALSE;      }  }

int wxSerialPort::GetLineState(){    BOOL ok = false;    DWORD stat;    int flags = 0;    if(GetCommModemStatus(fd,&stat)) {	   if(stat & MS_CTS_ON) 		  flags |= wxSERIAL_LINESTATE_CTS;	   if(stat & MS_DSR_ON) 		  flags |= wxSERIAL_LINESTATE_DSR;	   if(stat & MS_RING_ON) 		  flags |= wxSERIAL_LINESTATE_RING;	   if(stat & MS_RLSD_ON) 		  flags |= wxSERIAL_LINESTATE_DCD;	   ok = true;    }    if(!ok) return -1;    return flags;};