文章目录
- Qt QSerialPort数据发送和接收DataComm
- 2.添加 Qt Serial Port 模块
- 3.实例源码
Qt QSerialPort数据发送和接收DataComm
Qt 框架的Qt Serial Port 模块提供了访问串口的基本功能,包括串口通信参数配置和数据读写,使用 Qt Serial Port 模块就可以很方便地编写具有串口通信功能的应用程序。
- 创建一个基于
QMainWindow
应用程序
2.添加 Qt Serial Port 模块
Qt Serial Port 模块用于串口通信编程,要在一个项目中使用 Qt Serial Port 模块,需要在项目配置文件中加入一行语句:QT += serialport
Qt Serial Port 模块中只包含有两个类:QSerialPortInfo
和 QSerialPort
。
3.实例源码
头文件datacomm.h
#ifndef DATACOMM_H
#define DATACOMM_H
#include <QMainWindow>
#include <QSerialPort>
#include <QSerialPortInfo>
#include <QTimer>
QT_BEGIN_NAMESPACE
namespace Ui {
class DataComm;
}
QT_END_NAMESPACE
class DataComm : public QMainWindow
{
Q_OBJECT
public:
DataComm(QWidget *parent = nullptr);
~DataComm();
private slots:
void clear_recv();
void clear_send();
void on_com_recv();
void on_com_send();
void on_com_open();
void on_com_changed(int index);
void on_timeout();
void on_check_state_changed(int);
void get_interval();
private:
void send();
Ui::DataComm *ui;
QSerialPort comPort;
bool bCircle;
int interval;
QTimer *timer;
QByteArray stdCmd;
QString strCmd;
};
#endif // DATACOMM_H
源文件datacomm.cpp
#include "datacomm.h"
#include "ui_datacomm.h"
#include <QMessageBox>
DataComm::DataComm(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::DataComm)
{
ui->setupUi(this);
foreach (QSerialPortInfo portInfo, QSerialPortInfo::availablePorts()) {
ui->comboBoxPort->addItem(portInfo.portName());
}
ui->comboBoxPort->setCurrentIndex(2);
connect(ui->comboBoxPort,SIGNAL(currentIndexChanged(int)),this,SLOT(on_com_changed(int)));
ui->pushButtonOpen->setEnabled(ui->comboBoxPort->count()>0);
ui->pushButtonSend->setEnabled(false);
connect(ui->pushButtonOpen,SIGNAL(clicked()),this,SLOT(on_com_open()));
connect(ui->pushButtonSend,SIGNAL(clicked()),this,SLOT(on_com_send()));
ui->comboBoxBaud->clear();
foreach (qint32 baud, QSerialPortInfo::standardBaudRates()) {
ui->comboBoxBaud->addItem(QString::number(baud));
}
ui->comboBoxBaud->setCurrentText("9600");
ui->comboBoxCheck->addItem("NONE");
ui->comboBoxCheck->addItem("ODD");
ui->comboBoxCheck->addItem("EVEN");
ui->comboBoxCheck->addItem("SPACE");
ui->comboBoxCheck->addItem("MARK");
ui->comboBoxFlowCtrl->addItem("NONE");
ui->comboBoxFlowCtrl->addItem("HARD");
ui->comboBoxFlowCtrl->addItem("SOFT");
ui->comboBoxDataBit->addItem("5");
ui->comboBoxDataBit->addItem("6");
ui->comboBoxDataBit->addItem("7");
ui->comboBoxDataBit->addItem("8");
ui->comboBoxDataBit->setCurrentText("8");
ui->comboBoxStopBit->addItem("1");
ui->comboBoxStopBit->addItem("1.5");
ui->comboBoxStopBit->addItem("2");
timer = new QTimer(this);
ui->lineEditTime->setText("1000");
interval = 1000;
connect(ui->pushButtonClearRecv,&QPushButton::clicked,this,&DataComm::clear_recv);
connect(ui->pushButtonClearSend,&QPushButton::clicked,this,&DataComm::clear_send);
connect(timer,&QTimer::timeout,this,&DataComm::on_timeout);
connect(ui->lineEditTime,&QLineEdit::textChanged,this,&DataComm::get_interval);
connect(&comPort,&QIODevice::readyRead,this,&DataComm::on_com_recv);
connect(ui->checkBoxCircle,&QCheckBox::stateChanged,this,&DataComm::on_check_state_changed);
resize(800,600);
}
DataComm::~DataComm()
{
delete ui;
}
void DataComm::clear_recv()
{
ui->plainTextEditRecv->clear();
}
void DataComm::clear_send()
{
ui->plainTextEditSend->clear();
}
void DataComm::on_com_open()
{
if(comPort.isOpen()) {
comPort.close();
ui->comboBoxPort->setEnabled(true);
ui->comboBoxBaud->setEnabled(true);
ui->comboBoxCheck->setEnabled(true);
ui->comboBoxDataBit->setEnabled(true);
ui->comboBoxStopBit->setEnabled(true);
ui->comboBoxFlowCtrl->setEnabled(true);
ui->pushButtonSend->setEnabled(false);
ui->pushButtonOpen->setText("打开");
}
else {
int index = ui->comboBoxPort->currentIndex();
QList<QSerialPortInfo> comList = QSerialPortInfo::availablePorts();
QSerialPortInfo portInfo = comList.at(index);
comPort.setPort(portInfo);
comPort.setReadBufferSize(2048);
comPort.setBaudRate(ui->comboBoxBaud->currentText().toInt());
int value = ui->comboBoxDataBit->currentText().toInt();
comPort.setDataBits(QSerialPort::DataBits(value));
value = ui->comboBoxCheck->currentText().toInt();
if(value != 0) {
value ++;
}
comPort.setParity(QSerialPort::Parity(value));
value = ui->comboBoxStopBit->currentText().toInt();
comPort.setStopBits(QSerialPort::StopBits(value));
value = ui->comboBoxFlowCtrl->currentText().toInt();
comPort.setFlowControl(QSerialPort::FlowControl(value));
if(comPort.open(QIODevice::ReadWrite)) {
ui->comboBoxPort->setEnabled(false);
ui->comboBoxBaud->setEnabled(false);
ui->comboBoxCheck->setEnabled(false);
ui->comboBoxDataBit->setEnabled(false);
ui->comboBoxStopBit->setEnabled(false);
ui->comboBoxFlowCtrl->setEnabled(false);
ui->pushButtonSend->setEnabled(true);
ui->pushButtonOpen->setText("关闭");
}
}
}
void DataComm::get_interval()
{
int val = ui->lineEditTime->text().toInt();
if(val > 0) {
interval = val;
}
else {
ui->lineEditTime->setText(QString::number(interval));
}
}
void DataComm::on_check_state_changed(int)
{
bCircle = ui->checkBoxCircle->isChecked();
if(!bCircle) {
if(timer->isActive()) {
timer->stop();
ui->pushButtonSend->setEnabled(true);
}
}
}
void DataComm::send()
{
ui->plainTextEditRecv->appendPlainText("Tx: "+ strCmd );
comPort.write((const QByteArray )stdCmd);
}
void DataComm::on_com_send()
{
strCmd = ui->plainTextEditSend->toPlainText();
if(strCmd.isEmpty()) {
QMessageBox::information(this,tr("发送内容为空"),tr("发送内容为空!"));
return;
}
QByteArray ba = QByteArray (strCmd.toUtf8());
stdCmd = ba;
send();
bCircle = ui->checkBoxCircle->isChecked();
if(bCircle) {
ui->pushButtonSend->setEnabled(false);
timer->start(interval);
}
}
void DataComm::on_timeout()
{
send();
}
void DataComm::on_com_recv()
{
if(comPort.bytesAvailable()) {
comPort.waitForReadyRead(100);
QByteArray all = comPort.read(1024);
QString str(all);
if(!str.isEmpty()){
ui->plainTextEditRecv->appendPlainText("Rx: "+ str );
}
}
}
void DataComm::on_com_changed(int index)
{
}
源文件main.cpp
#include "datacomm.h"
#include <QApplication>
#include <QLocale>
#include <QTranslator>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QTranslator translator;
const QStringList uiLanguages = QLocale::system().uiLanguages();
for (const QString &locale : uiLanguages) {
const QString baseName = "DataCom_" + QLocale(locale).name();
if (translator.load(":/i18n/" + baseName)) {
a.installTranslator(&translator);
break;
}
}
DataComm w;
w.show();
return a.exec();
}
nguages) {
const QString baseName = “DataCom_” + QLocale(locale).name();
if (translator.load(“:/i18n/” + baseName)) {
a.installTranslator(&translator);
break;
}
}
DataComm w;
w.show();
return a.exec();
}