打开串口总是失败QIODevice::read: device not open - QTCN开发网

只看楼主倒序阅读楼主发表于: 2016-04-21

/******************************************************widget.h************************************************/
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>
#include <QTimer>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
private slots:

    void on_cmopen_clicked();

    void on_send_clicked();
    void updateAA();

private:
    Ui::Widget *ui;
    QSerialPort *my_serialport;
    QByteArray requestData;
    QTimer *timer;
};

#endif // WIDGET_H

/*********************************************************widget.cpp***************************************************************/
#include "widget.h"
#include "ui_widget.h"
#include <QtSerialPort/QSerialPort>
#include <QtSerialPort/QSerialPortInfo>
#include <QDebug>
#include <QTimer>
#include <QIODevice>

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

    foreach (const QSerialPortInfo &info,QSerialPortInfo::availablePorts())
    {
        qDebug()<<"Name         :"<<info.portName() ;
        qDebug()<<"Description  :"<<info.description();
        qDebug()<<"Manufacturer :"<<info.manufacturer();

        //Example use QSerialPort
        QSerialPort serial;
        serial.setPort(info);
        if(serial.open(QIODevice::ReadOnly))
        {
            ui->comboBox->addItem(info.portName());
            serial.close();
        }
    }
}

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

void Widget::on_cmopen_clicked()
{
    my_serialport = new QSerialPort();
    qDebug()<<ui->comboBox->currentText();
    my_serialport->setPortName(ui->comboBox->currentText());
    my_serialport->open(QIODevice::ReadWrite);
    qDebug()<<ui->lineEdit->text().toInt();

    my_serialport->setBaudRate(ui->lineEdit->text().toInt());
    my_serialport->setDataBits(QSerialPort::Data8);
    my_serialport->setParity(QSerialPort::NoParity);
    my_serialport->setStopBits(QSerialPort::OneStop);
    my_serialport->setFlowControl(QSerialPort::NoFlowControl);

    timer = new QTimer(this);
    connect(timer,SIGNAL(timeout()),this,SLOT(updateAA()));
    timer->start(1000);
}

void Widget::on_send_clicked()
{
    QByteArray TxData = "aaaa";
    my_serialport->write(TxData);
}

void Widget::updateAA()
{
    requestData = my_serialport->readAll();
    if(requestData!=NULL)
    {
        ui->textEdit->append(requestData);
    }
    requestData.clear();
}