今天用Qt写了一个串口收发工具，记录下整个流程。

1、项目工程布局

2、ui文件布局

3、widget.h文件

#ifndef WIDGET_H

#define WIDGET_H

#include

#include

#include

#include

QT_BEGIN_NAMESPACE

namespace Ui { class Widget; }

QT_END_NAMESPACE

class Widget : public QWidget

{

Q_OBJECT

public:

Widget(QWidget *parent = nullptr);

~Widget();

private:

Ui::Widget *ui;

QSerialPort *pSerialPort;

QByteArray recvData;

};

#endif // WIDGET_H

4、widget.cpp文件

#include "widget.h"

#include "ui_widget.h"

#include

#include

#include

#include

#include

Widget::Widget(QWidget *parent)

: QWidget(parent)

, ui(new Ui::Widget)

{

ui->setupUi(this);

ui->widget->setWindowTitle("串口助手");

pSerialPort = NULL;

//枚举识别到的com口

//写法一:

/* foreach(QSerialPortInfo info,QSerialPortInfo::availablePorts())//读串口

{

QSerialPort port;

port.setPort(info);

if(port.open(QIODevice::ReadWrite))//如果串口可以读写的形式打开

{

ui->comboBox_portName->addItem(info.portName()); //显示出来

port.close();//自动关闭等待人为打开

}

}*/

//写法二

QList seriList = QSerialPortInfo::availablePorts();

for(int i = 0;i

{

QSerialPort port;

port.setPort(seriList.at(i));

if(port.open(QIODevice::ReadWrite))

{

ui->comboBox_portName->addItem(seriList.at(i).portName());

port.close();

}

}

//信号槽连接打开按钮和相关处理操作

connect(ui->openBtn,&QPushButton::clicked,[=](){

if(pSerialPort != NULL)

{

QMessageBox::warning(this,"警告","已有活跃串口,请先关闭再打开");

return;

}

pSerialPort = new QSerialPort(this);

pSerialPort->setPortName(ui->comboBox_portName->currentText());

pSerialPort->open(QIODevice::ReadWrite);

pSerialPort->setBaudRate(ui->comboBox_bandRate->currentText().toInt());

pSerialPort->setDataBits(QSerialPort::Data8);

pSerialPort->setParity(QSerialPort::NoParity);

pSerialPort->setFlowControl(QSerialPort::NoFlowControl);

pSerialPort->setStopBits(QSerialPort::OneStop);

connect(pSerialPort,&QSerialPort::readyRead,this,[=](){

recvData = pSerialPort->readAll();

if(!recvData.isEmpty())

{

ui->textEdit_read->append(recvData);

}

recvData.clear();

});

});

//发送数据信号槽连接

connect(ui->sendBtn,&QPushButton::clicked,this,[=](){

if(NULL == pSerialPort )

return;

pSerialPort->write(ui->lineEdit_write->text().toUtf8());

ui->lineEdit_write->clear();

});

//清空按钮信号槽连接

connect(ui->clearBtn,&QPushButton::clicked,this,[=](){

ui->textEdit_read->clear();

});

//关闭串口按钮信号槽连接

connect(ui->closeBtn,&QPushButton::clicked,this,[=](){

pSerialPort->close();

delete pSerialPort;

pSerialPort = NULL;

});

//保存按钮信号槽连接

connect(ui->saveBtn,&QPushButton::clicked,this,[=](){

if(ui->textEdit_read->document()->isEmpty())

{

QMessageBox::warning(this,"警告","记录不能为空");

return;

}

QString path = QFileDialog::getSaveFileName(this,"保存log记录","log记录","(*.txt)");

qDebug()<

if (path.isEmpty())

{

QMessageBox::warning(this,"路径","路径不能为空");

return ;

}

QFile file(path);

file.open(QIODevice::WriteOnly|QIODevice::Text);

QTextStream stream(&file);

stream<textEdit_read->toPlainText();

file.close();

});

ui->lineEdit_write->setFocus();

}

Widget::~Widget()

{

delete ui;

}

5、main.cpp 文件

#include "widget.h"

#include

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

{

QApplication a(argc, argv);

Widget w;

w.show();

return a.exec();

}

6、Serial.pro中要加入 serialport 模块

7.运行效果(电脑上外接串口，然后串口Tx和Rx短接，用作自发自收)