Qt 3. QSerialPortInfo显示串口信息在QTextEdit显示

//ex2.cpp
#include "ex2.h"
#include "ui_ex2.h"
#include 

int static cnt = 0;

Ex2::Ex2(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Ex2)
{
    ui->setupUi(this);
}

Ex2::~Ex2()
{
    delete ui;
}


void Ex2::on_pushButtonMy1_clicked()
{
    cnt ++;
    QString str = QString::number(cnt,10);
    ui->textEditMy1->setText(str);
}

void Ex2::on_pushButtonMy2_clicked()
{
    if(cnt > 0) cnt --;
    QString str = QString::number(cnt,10);
    ui->textEditMy1->setText(str);
}

void Ex2::on_pushButtonClr_clicked()
{
    ui->textEditMy1->setText("");
}

void Ex2::on_pushButtonComm_clicked()
{
    QList<QSerialPortInfo> list = QSerialPortInfo::availablePorts();
    ui->textEditMy1->setText("Total number of availiable ports:" + QString::number(list.count(), 10));
    foreach(const QSerialPortInfo &serialportinfo, list)
    {
        ui->textEditMy1->append( "===========================================");
        ui->textEditMy1->append( "Port: " + serialportinfo.portName());
        ui->textEditMy1->append( "Location: " + serialportinfo.systemLocation());
        ui->textEditMy1->append( "Description: " + serialportinfo.description());
        ui->textEditMy1->append( "Manufactutor: " + serialportinfo.manufacturer());
        ui->textEditMy1->append( "Vendor Indentifier: " + QString::number(serialportinfo.vendorIdentifier(), 10));
        ui->textEditMy1->append( "Busy: " + QString::number(serialportinfo.isBusy()));
    }
}