Question

我对qt信号槽感到困惑。我使用了以下连接，但它连接到另一个插槽。

 void MainWindow::on_otpburndata1Btn_Rd_clicked()
{
    if(serialPort->clear(serialPort->AllDirections)){
        QByteArray otpburndata1ord;
        otpburndata1ord.resize(3);
        otpburndata1ord[2]=0x02;
        otpburndata1ord[1]=0x08;
        otpburndata1ord[0]=0x1D;
        serialPort->write(otpburndata1ord.data(),3);
        connect(serialPort,SIGNAL(readyRead()),this,SLOT(receiveOtpBurnData1()));
    }
}

void MainWindow::receiveOtpBurnData1(){
    QByteArray otpburndata1;
    otpburndata1.resize(1);
    if(serialPort->bytesAvailable()==1){
    otpburndata1 = serialPort->readAll();
    if(otpburndata1[0]&0x01){
        ui->OTP_DATA0->setStyleSheet("background-color:red");
        ui->OTP_DATA0->setText("1");
        flagThree[0]=1;
    }else{
        ui->OTP_DATA0->setStyleSheet("background-color:rgb(170, 255, 127)");
        ui->OTP_DATA0->setText("0");
        flagThree[0]=0;
    }
    ...
    ...
    ...
  }
}

因为我在此on_otpburndata1Btn_Rd_clicked（）函数之前使用了另一个函数。当我单击Button：otpburndata1Btn_Rd时，它从端口读取数据，但是连接到另一个插槽otprddata1Received（），而不是右侧插槽receiveOtpBurnData1（）。先前的代码如下：

     void MainWindow::on_otprddata1Btn_clicked()
{
    if(serialPort->clear(serialPort->AllDirections)){
        QByteArray otprdata1ord;
        otprdata1ord.resize(3);
        otprdata1ord[0]=0x9D;
        otprdata1ord[1]=0x00;
        otprdata1ord[2]=0x02;
        serialPort->write(otprdata1ord.data(),3);
        connect(serialPort,SIGNAL(readyRead()),this,SLOT(otprddata1Received()));
    }
}

void MainWindow::otprddata1Received(){
    QByteArray  otprdata1;
    otprdata1.resize(1);
    if(serialPort->bytesAvailable()==1){
        otprdata1 = serialPort->readAll();
        if(otprdata1[0]&0x01){
            ui->OTP_RD_DATA0->setStyleSheet("background-color:red");
            ui->OTP_RD_DATA0->setText("1");
        }else{
            ui->OTP_RD_DATA0->setStyleSheet("background-color:rgb(170, 255, 127)");
            ui->OTP_RD_DATA0->setText("0");
        }
        ....
}

Answer 1

我已经通过为每个数据添加额外的2字节来解决问题，以区别点击哪个按钮以及显示接收数据的位置。因此，区分每个数据是正确的。例如，如果GUI将从串行端口接收1字节数据，我添加另外2个字节用于区分（当然1byte也可以）。代码如下：

    void MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{

....

 connect(this,SIGNAL(readyReadotprddata1()),this,SLOT(otprddata1Received()));
    connect(this,SIGNAL(readyReadotprddata2()),this,SLOT(otprddata2Received()));
    connect(this,SIGNAL(readyReadotprddata3()),this,SLOT(otprddata3Received()));
    connect(this,SIGNAL(readyReadotpburndata1()),this,SLOT(receiveOtpBurnData1()));
    connect(this,SIGNAL(readyReadotpburndata2()),this,SLOT(receiveOtpBurnData2()));
    connect(this,SIGNAL(readyReadotpburndata3()),this,SLOT(receiveOtpBurnData3()));
    connect(this,SIGNAL(readyReadotpctrlreg1()),this,SLOT(receiveOtpctrlReg1()));
    connect(this,SIGNAL(readyReadotpctrlreg2()),this,SLOT(receiveOtpctrlReg2()));
    connect(this,SIGNAL(readyReadsiliconid()),this,SLOT(receiveSiliconidDataord()));

}

    void MainWindow::on_otprddata1Btn_clicked()
{
    if(serialPort->clear(serialPort->AllDirections)){
        QByteArray otprdata1ord;
        otprdata1ord.resize(3);
        otprdata1ord[0]=0x9D;
        otprdata1ord[1]=0x00;
        otprdata1ord[2]=0x02;
        serialPort->write(otprdata1ord.data(),3);
        connect(serialPort,SIGNAL(readyRead()),this,SLOT(commonDistinct()));
    }
}

....

    void MainWindow::commonDistinct(){
    if(serialPort->bytesAvailable()==3){
        data=serialPort->readAll();
        if(data[0].operator ==(0x9D) && data[1].operator ==(0x00)) emit readyReadotprddata1();
        else if(data[0].operator ==(0xBD) && data[1].operator ==(0x00)) emit readyReadotprddata2();
        else if(data[0].operator ==(0xDD) && data[1].operator ==(0x00)) emit readyReadotprddata3();
        else if(data[0].operator ==(0x1D) && data[1].operator ==(0x08)) emit readyReadotpburndata1();
        else if(data[0].operator ==(0x1D) && data[1].operator ==(0x04)) emit readyReadotpburndata2();
        else if(data[0].operator ==(0x3D) && data[1].operator ==(0x04))emit readyReadotpburndata3();
        else if(data[0].operator ==(0x1D) && data[1].operator ==(0x02))emit readyReadotpctrlreg1();
        else if(data[0].operator ==(0x1D) && data[1].operator ==(0x01))emit readyReadotpctrlreg2();
        else if(data[0].operator ==(0x5D) && data[1].operator ==(0x00))emit readyReadsiliconid();
    }
}


void MainWindow::otprddata1Received(){
        if(data[2]&0x01){
            ui->OTP_RD_DATA0->setStyleSheet("background-color:red");
            ui->OTP_RD_DATA0->setText("1");
        }else{
            ui->OTP_RD_DATA0->setStyleSheet("background-color:rgb(170, 255, 127)");
            ui->OTP_RD_DATA0->setText("0");
        }
....

}

为什么我使用这个答案是，每当有串口接收到数据时，每次都会发出Qt5信号readyRead（）。我所有需要的数据都是1个字节。我不能使用bytesAvailable（）函数来区分接收的数据。

Qt5：串口信号槽机制信号连接到错误的插槽

1 个答案: