QT简单串口通信终端实现

1.工程文件

工程文件中添加serilport

QT += serialport

2.主程序

主程序文件main.cpp

#include "mainwindow.h"

#include 

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    MainWindow w;

    w.show();

    return a.exec();

}

3.文本控制台类

控制台类头文件console.h

#ifndef CONSOLE_H

#define CONSOLE_H

#include 

class Console : public QPlainTextEdit

{

    Q_OBJECT

signals:

    void getData(const QByteArray &data);

public:

    explicit Console(QWidget *parent = nullptr);

    void putData(const QByteArray &data);

    void setLocalEchoEnabled(bool set);

protected:

    void keyPressEvent(QKeyEvent *e) override;

    void mousePressEvent(QMouseEvent *e) override;

    void mouseDoubleClickEvent(QMouseEvent *e) override;

    void contextMenuEvent(QContextMenuEvent *e) override;

private:

    bool m_localEchoEnabled = false;

};

#endif // CONSOLE_H

控制台实现文件console.cpp 

#include "console.h"

#include 

Console::Console(QWidget *parent) :

    QPlainTextEdit(parent)

{

    document()->setMaximumBlockCount(100);

    QPalette p = palette();

    p.setColor(QPalette::Base, Qt::black);

    p.setColor(QPalette::Text, Qt::green);

    setPalette(p);

}

void Console::putData(const QByteArray &data)

{

    insertPlainText(data);

    QScrollBar *bar = verticalScrollBar();

    bar->setValue(bar->maximum());

}

void Console::setLocalEchoEnabled(bool set)

{

    m_localEchoEnabled = set;

}

void Console::keyPressEvent(QKeyEvent *e)

{

    switch (e->key()) {

    case Qt::Key_Backspace:

    case Qt::Key_Left:

    case Qt::Key_Right:

    case Qt::Key_Up:

    case Qt::Key_Down:

        break;

    default:

        if (m_localEchoEnabled)

            QPlainTextEdit::keyPressEvent(e);

        emit getData(e->text().toLocal8Bit());

    }

}

void Console::mousePressEvent(QMouseEvent *e)

{

    Q_UNUSED(e)

    setFocus();

}

void Console::mouseDoubleClickEvent(QMouseEvent *e)

{

    Q_UNUSED(e)

}

void Console::contextMenuEvent(QContextMenuEvent *e)

{

    Q_UNUSED(e)

}

4. 串口设置类

串口设置类头文件settingdialog.h

串口设置类实现文件settingdialog.cpp 

5. 主窗口类

主窗口类头文件mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include 
#include 
 
QT_BEGIN_NAMESPACE
 
class QLabel;
 
namespace Ui {
class MainWindow;
}
 
QT_END_NAMESPACE
 
class Console;
class SettingsDialog;
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
 
private slots:
    void openSerialPort();
    void closeSerialPort();
    void about();
    void writeData(const QByteArray &data);
    void readData();
 
    void handleError(QSerialPort::SerialPortError error);
 
private:
    void initActionsConnections();
 
private:
    void showStatusMessage(const QString &message);
 
    Ui::MainWindow *m_ui = nullptr;
    QLabel *m_status = nullptr;
    Console *m_console = nullptr;
    SettingsDialog *m_settings = nullptr;
    QSerialPort *m_serial = nullptr;
};
 
#endif // MAINWINDOW_H
 
 

主窗口实现文件mainwindow.cpp 

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "console.h"
#include "settingsdialog.h"
 
#include 
#include 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    m_ui(new Ui::MainWindow),
    m_status(new QLabel),
    m_console(new Console),
    m_settings(new SettingsDialog),
    m_serial(new QSerialPort(this))
{
    m_ui->setupUi(this);
 
    setWindowTitle(tr("Serial Servo"));
 
    m_console->setEnabled(false);
    setCentralWidget(m_console);
 
    m_ui->actionConnect->setEnabled(true);
    m_ui->actionDisconnect->setEnabled(false);
    m_ui->actionQuit->setEnabled(true);
    m_ui->statusBar->addWidget(m_status);
 
    initActionsConnections();
 
    connect(m_serial, &QSerialPort::errorOccurred, this, &MainWindow::handleError);
    connect(m_serial, &QSerialPort::readyRead, this, &MainWindow::readData);
    connect(m_console, &Console::getData, this, &MainWindow::writeData);
}
 
MainWindow::~MainWindow()
{
    delete m_ui;
    delete m_settings;
}
 
void MainWindow::openSerialPort()
{
    const SettingsDialog::Settings p = m_settings->settings();
    m_serial->setPortName(p.name);
    m_serial->setBaudRate(p.baudRate);
    m_serial->setDataBits(p.dataBits);
    m_serial->setParity(p.parity);
    m_serial->setStopBits(p.stopBits);
    m_serial->setFlowControl(p.flowControl);
    if(m_serial->open(QIODevice::ReadWrite)){
        m_console->setEnabled(true);
        m_console->setLocalEchoEnabled(p.localEchoEnabled);
        m_ui->actionConnect->setEnabled(false);
        m_ui->actionDisconnect->setEnabled(true);
        m_ui->actionConfigure->setEnabled(false);
 
        showStatusMessage(tr("Connect to %1 :%2, %3, %4, %5, %6")
                          .arg(p.name).arg(p.stringBaudRate).arg(p.stringDataBits)
                          .arg(p.stringParity).arg(p.stringStopBits).arg(p.stringFlowControl));
    } else {
        QMessageBox::critical(this, tr("Error"), m_serial->errorString());
        showStatusMessage(tr("Open error"));
    }
}
 
void MainWindow::closeSerialPort()
{
    if(m_serial->isOpen())
    {
        m_serial->close();
    }
    m_console->setEnabled(false);
    m_ui->actionConnect->setEnabled(true);
    m_ui->actionDisconnect->setEnabled(false);
    m_ui->actionConfigure->setEnabled(true);
    showStatusMessage(tr("Disconnected"));
}
 
void MainWindow::about()
{
    QMessageBox::about(this, "About Serial Servo",
                       tr("Serial Servo Demo"));
}
 
void MainWindow::writeData(const QByteArray &data)
{
    m_serial->write(data);
}
 
void MainWindow::readData()
{
    const QByteArray data = m_serial->readAll();
    m_console->putData(data);
}
 
void MainWindow::handleError(QSerialPort::SerialPortError error)
{
    if(error == QSerialPort::ResourceError){
        QMessageBox::critical(this, tr("Critical Error"), m_serial->errorString());
        closeSerialPort();
    }
}
 
void MainWindow::initActionsConnections()
{
    connect(m_ui->actionConnect, &QAction::triggered, this, &MainWindow::openSerialPort);
    connect(m_ui->actionDisconnect, &QAction::triggered, this, &MainWindow::closeSerialPort);
    connect(m_ui->actionQuit, &QAction::triggered, this, &MainWindow::close);
    connect(m_ui->actionConfigure, &QAction::triggered, m_settings, &SettingsDialog::show);
    connect(m_ui->actionClear, &QAction::triggered, m_console, &Console::clear);
    connect(m_ui->actionAbout, &QAction::triggered, this, &MainWindow::about);
}
 
void MainWindow::showStatusMessage(const QString &message)
{
    m_status->setText(message);
}

6. 运行结果