/////////////////////////////////////////////////////////////
// Serial.cpp
#include "stdafx.h"
#include "Serial.h"
//BEGIN_EVENTSINK_MAP(CSerial,CObject);
//ON_EVENT()
CSerial::CSerial()
{
memset( &m_OverlappedRead, 0, sizeof( OVERLAPPED ) );
memset( &m_OverlappedWrite, 0, sizeof( OVERLAPPED ) );
m_hIDComDev = NULL;
m_bOpened = FALSE;
}
CSerial::~CSerial()
{
Close();
}
BOOL CSerial::Open( int nPort, int nBaud ,int BAU ,int PAR , int STO)
{
if( m_bOpened ) return( TRUE );
char szPort[15];
char szComParams[50];
DCB dcb;
wsprintf( szPort, "COM%d", nPort );
m_hIDComDev = CreateFile( szPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL );
if( m_hIDComDev == NULL ) return( FALSE );
memset( &m_OverlappedRead, 0, sizeof( OVERLAPPED ) );
memset( &m_OverlappedWrite, 0, sizeof( OVERLAPPED ) );
COMMTIMEOUTS CommTimeOuts;
CommTimeOuts.ReadIntervalTimeout = 0xFFFFFFFF;
CommTimeOuts.ReadTotalTimeoutMultiplier = 0;
CommTimeOuts.ReadTotalTimeoutConstant = 0;
CommTimeOuts.WriteTotalTimeoutMultiplier = 0;
CommTimeOuts.WriteTotalTimeoutConstant = 5000;
if( !SetCommTimeouts( m_hIDComDev, &CommTimeOuts ))
MessageBox(NULL,"Error","Can't Open the COM!",MB_OK);
wsprintf( szComParams, "COM%d:%d,n,8,1", nPort, nBaud );
m_OverlappedRead.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
m_OverlappedWrite.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
dcb.DCBlength = sizeof( DCB );
GetCommState( m_hIDComDev, &dcb );
dcb.BaudRate = nBaud;
dcb.ByteSize = BAU;
dcb.Parity =PAR;
dcb.StopBits = STO;
unsigned char ucSet;
ucSet = (unsigned char) ( ( FC_RTSCTS & FC_DTRDSR ) != 0 );
ucSet = (unsigned char) ( ( FC_RTSCTS & FC_RTSCTS ) != 0 );
ucSet = (unsigned char) ( ( FC_RTSCTS & FC_XONXOFF ) != 0 );
if( !SetCommState( m_hIDComDev, &dcb ) ||
!SetupComm( m_hIDComDev, 10000, 10000 ) ||
m_OverlappedRead.hEvent == NULL ||
m_OverlappedWrite.hEvent == NULL ){
DWORD dwError = GetLastError();
if( m_OverlappedRead.hEvent != NULL ) CloseHandle( m_OverlappedRead.hEvent );
if( m_OverlappedWrite.hEvent != NULL ) CloseHandle( m_OverlappedWrite.hEvent );
CloseHandle( m_hIDComDev );
return( FALSE );
}
m_bOpened = TRUE;
return( m_bOpened );
}
BOOL CSerial::Close( void )
{
if( !m_bOpened || m_hIDComDev == NULL ) return( TRUE );
if( m_OverlappedRead.hEvent != NULL ) CloseHandle( m_OverlappedRead.hEvent );
if( m_OverlappedWrite.hEvent != NULL ) CloseHandle( m_OverlappedWrite.hEvent );
CloseHandle( m_hIDComDev );
m_bOpened = FALSE;
m_hIDComDev = NULL;
return( TRUE );
}
BOOL CSerial::WriteCommByte( unsigned char ucByte )
{
BOOL bWriteStat;
DWORD dwBytesWritten;
bWriteStat = WriteFile( m_hIDComDev, (LPSTR) &ucByte, 1, &dwBytesWritten, &m_OverlappedWrite );
if( !bWriteStat && ( GetLastError() == ERROR_IO_PENDING ) ){
if( WaitForSingleObject( m_OverlappedWrite.hEvent, 1000 ) ) dwBytesWritten = 0;
else{
GetOverlappedResult( m_hIDComDev, &m_OverlappedWrite, &dwBytesWritten, FALSE );
m_OverlappedWrite.Offset += dwBytesWritten;
}
}
return( TRUE );
}
//以字节发送
/*
int CSerial::Write(unsigned char[] WriteBytes)
{
int BytesWritten = 0;
if (hComm != INVALID_HANDLE_VALUE)
{
OVERLAPPED ovlCommPort = new OVERLAPPED();
WriteFile(hComm, WriteBytes, WriteBytes.Length, ref BytesWritten, ref ovlCommPort);
}
return BytesWritten;
}*/
int CSerial::SendData( const unsigned char *buffer, int size)
{
if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );
DWORD dwBytesWritten = 0;
int i;
for( i=0; i<size; i++ ){
WriteCommByte( buffer[i] );
dwBytesWritten++;
}
return( (int) dwBytesWritten );
}
int CSerial::SendData( const char *buffer, int size )
{
if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );
DWORD dwBytesWritten = 0;
int i;
for( i=0; i<size; i++ ){
WriteCommByte( buffer[i] );
dwBytesWritten++;
}
return( (int) dwBytesWritten );
}
int CSerial::ReadDataWaiting( void )
{
if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );
DWORD dwErrorFlags;
COMSTAT ComStat;
ClearCommError( m_hIDComDev, &dwErrorFlags, &ComStat );
return( (int) ComStat.cbInQue );
}
int CSerial::ReadData( void *buffer, int limit )
{
if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );
BOOL bReadStatus;
DWORD dwBytesRead, dwErrorFlags;
COMSTAT ComStat;
ClearCommError( m_hIDComDev, &dwErrorFlags, &ComStat );
if( !ComStat.cbInQue ) return( 0 );
dwBytesRead = (DWORD) ComStat.cbInQue;
if( limit < (int) dwBytesRead ) dwBytesRead = (DWORD) limit;
bReadStatus = ReadFile( m_hIDComDev, buffer, dwBytesRead, &dwBytesRead, &m_OverlappedRead );
if( !bReadStatus )
{
if( GetLastError() == ERROR_IO_PENDING )
{
WaitForSingleObject( m_OverlappedRead.hEvent, 2000 );
return( (int) dwBytesRead );
}
return( 0 );
}
return( (int) dwBytesRead );
}
C++串口类封装
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2017-12-02
12:18:56
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