qt 操作串口

妖狐艹你老母 2022-05-19 03:25 225阅读 0赞

**第三方类下载**  
[https://sourceforge.net/projects/qextserialport/files/][https_sourceforge.net_projects_qextserialport_files]  
![1][]  
**目录介绍**  
![2][]  
**搭建工程**  
拷贝`qextserialbase.cpp、qextserialbase.h、win_qextserialport.cpp和win_qextserialport.h`到自己的工程下

//添加头文件
    #include "win_qextserialport.h"
    //添加串口定义
    Win_QextSerialPort *Com;
    //添加槽函数
    private slots:
        void readCom(); //当接收到数据，会有信号
        void on_pushButton_clicked(); //发送按钮，产生信号

**初始化**

//定义串口对象，指定串口名和查询模式，这里使用事件驱动EventDriven
    Com = new Win_QextSerialPort("COM2", QextSerialBase::EventDriven);
    
    //以读写方式打开串口
    if(Com->open(QIODevice::ReadWrite) == false)
    {
        QMessageBox::warning(this, tr("warning"), tr("COM2 open failed."));
    }
    
    Com->setBaudRate(BAUD9600);
    Com->setDataBits(DATA_8);
    Com->setParity(PAR_NONE);
    Com->setStopBits(STOP_1);
    Com->setFlowControl(FLOW_OFF);
    
    connect(Com,SIGNAL(readyRead()),this,SLOT(readCom()));
    connect(button,SIGNAL(clicked()),this,SLOT(on_pushButton_clicked()));

**读**

void MainWindow::readCom()
    {
        qDebug() << "read: "<< Com->bytesAvailable() << "bytes";
    
        //读取串口缓冲区的所有数据给临时变量data
        QByteArray data = Com->readAll();
    
        //将串口的数据显示在窗口的文本浏览器中
        ui->textBrowser->insertPlainText(data);
    }

**写**

void MainWindow::on_pushButton_clicked() //发送数据
    {
        //以ASCII码形式将数据写入串口
        Com->write(ui->lineEdit->text().toAscii());
    
        qDebug() << "write: "<< Com->bytesToWrite() << "bytes";
    }

**实际效果**  
![1][1 1]

经测试，在Win10运行，串口数据异常，还未找到原因  
建议使用：[https://blog.csdn.net/zhangxuechao\_/article/details/81154296][https_blog.csdn.net_zhangxuechao_article_details_81154296]

[https_sourceforge.net_projects_qextserialport_files]: https://sourceforge.net/projects/qextserialport/files/
[1]: /images/20220519/20d9c06fcd7f46be9e85a51b462a5115.png
[2]: /images/20220519/5793b223080e4c84945a3128b39f144d.png
[1 1]: /images/20220519/2664b968bf7d4bee94e2a3f53d85c45a.png
[https_blog.csdn.net_zhangxuechao_article_details_81154296]: https://blog.csdn.net/zhangxuechao_/article/details/81154296