接手一个程序，已经编好了一个串口程序的代码，想要再添加一个串

#include "serialform.h"
#include "ui_serialform.h"
#include <QDebug>
#include "database.h"
#define SERIALTEST
SerialForm::SerialForm(QWidget *parent) :
QWidget(parent),
ui(new Ui::SerialForm)
{
m_fd=openSerialPort();
if(m_fd<0)
{
QMessageBox::warning(this,tr("Error"),tr("Fail to open serial port!"));
return ;
}
m_notifier=new QSocketNotifier(m_fd,QSocketNotifier::Read,this);
QObject::connect(m_notifier,SIGNAL(activated(int)),this,SLOT(remoteDataIncoming_clicked()));
ui->setupUi(this);
}
SerialForm::~SerialForm()
{
if(m_notifier)
{
delete m_notifier;
m_notifier=0;
}
if(m_fd>=0)
{
::close(m_fd);
m_fd=-1;
}
delete ui;
}
void SerialForm::show_this_window()
{
this->move(0,0);
this->setWindowFlags(Qt::FramelessWindowHint);
this->show();
emit close_other_windows();
}
void SerialForm::close_this_window()
{
this->close();
}
void SerialForm::on_SendButton_clicked()
{
static int number=0;
if(number<1){
QString declare="this is PortHelper,which is made by Flame.Thanke you!";
::write(m_fd,declare.toLatin1(),declare.length());
number++;
}
QString string=ui->SendWindow->toPlainText();
if(string.isEmpty())
{
return;
}
::write(m_fd,string.toLatin1(),string.length());
ui->SendWindow->setText("");
}
int SerialForm::openSerialPort()
{
int fd=-1;
const char *devName="/dev/ttySAC2";
fd=::open(devName,O_RDWR|O_NONBLOCK);
if(fd<0){
return -1;
}
termios serialAttr;
memset(&serialAttr,0,sizeof serialAttr);
serialAttr.c_cflag=B115200|HUPCL|CS8|CREAD|CLOCAL;
serialAttr.c_cc[VMIN]=1;
if(tcsetattr(fd,TCSANOW,&serialAttr)!=0){
return -1;
}
return fd;
}
void SerialForm::remoteDataIncoming_clicked()
{
char c;
static QString ch;
bool success=read(m_fd,&c,1);
if(!success){
qDebug()<<"Error"<<endl;
return;
}

楼主不是伸手党，真心求问，就是不太懂