记录解决QT父子窗口互传值、一些数据类型转换问题

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目录

• 一、父子窗口互相传值
  • • ①父向子窗口传递值
    • ②子向父窗口传递值
• 二、数据类型转换
  • • ①int转QString
    • ②int转16进制
    • ③QString转unsigned char
    • ④ unchar转QString
    • ⑤char转int
    • ⑥QByteArray转16进制

一、父子窗口互相传值

①父向子窗口传递值

父.h

private slots:
    void on_btnMore_clicked();
signals:
    void sendStr(QTableWidgetItem*,QTableWidgetItem*,QTableWidgetItem*);

父.cpp

connect(btnMore, SIGNAL(clicked()), this, SLOT(on_btnMore_clicked()), Qt::UniqueConnection);//防止重复调用

void Test::on_btnMore_clicked()
{
	OKFlag = 0;
    testDialog->setModal(true);
    if(OKFlag == 0)
    	connect(paramDialog,SIGNAL(sendNewStr(QString)),this,SLOT(getNewStr(QString)));
   	QObject* obj = sender();
    if (obj != nullptr)
    {
        // 获取该单元格对应的数据
        item1 = ui->tableWidget->item(row, 1);
        item2 = ui->tableWidget->item(row, 2);
        item3 = ui->tableWidget->item(row, 3);
        QObject::connect(this,SIGNAL(sendStr(QTableWidgetItem*,QTableWidgetItem*,QTableWidgetItem*)),paramDialog,SLOT(getStr(QTableWidgetItem*,QTableWidgetItem*,QTableWidgetItem*)));
        if (item1 != nullptr && item2 != nullptr && item3 != nullptr)
        {
            emit sendStr(item1,item2,item3);
            disconnect(this,SIGNAL(sendStr(QTableWidgetItem*,QTableWidgetItem*,QTableWidgetItem*)),paramDialog,SLOT(getStr(QTableWidgetItem*,QTableWidgetItem*,QTableWidgetItem*)));
        }
    }
    paramDialog->show();
}

子.h

private slots:
    void getStr(QTableWidgetItem*,QTableWidgetItem*,QTableWidgetItem*);

子.cpp

void TestDialog::getStr(QTableWidgetItem* item1,QTableWidgetItem* item2,QTableWidgetItem* item3)
{
    ui->tableWidget->setColumnWidth(0, 200);//设置固定宽度
    ui->Text->setText(item1->text());
    ui->describeText->setText(item2->text());
	QStringList show0 = item3->text().split('_');
	……
}

②子向父窗口传递值

子.h

signals:
    void sendNewStr(QString);
private slots:
    void on_OKButton_clicked();

子.cpp

void TestDialog::on_OKButton_clicked()
{
    OKFlag = 1;
    rowNum0 = 0, rowNum1 = 0;
    QString newstr = ui->currentNum->text();
    emit sendNewStr(newstr);
    ui->tableWidget->clearContents();
}

父.h

private slots:
    void getNewStr(QString);

父.cpp

void Test::getNewStr(QString newstr)
{
    int row = ui->tableWidget->currentItem()->row();//当前选中行
    QTableWidgetItem *GetNewStr = new QTableWidgetItem(newstr);
    ui->tableWidget->setItem(row,4,GetNewStr);
    if(OKFlag == 1)
        disconnect(paramDialog,SIGNAL(sendNewStr(QString)),this,SLOT(getNewStr(QString)));
    this->show();
    testDialog->hide();
}

相关解决方法可借鉴网址如下：
Qt 主窗口与子窗口之间传值
QT窗体之间值的传递，多种方法实现

二、数据类型转换

①int转QString

QString str1 = QString("%1").arg(12, 4, 16, QChar('0'));
QString str2 = QString("%1").arg(12, 4, 10, QChar('0'));

②int转16进制

int value =12;
QString str = QString::number(value, 16);// 最小位数
QString str2 =  QString("%1").arg(value,4,16,QLatin1Char('0'));//value为int型或char型都可，固定位数

③QString转unsigned char

unsigned char slaveAddChange = ui->spinBoxStation->text().toUtf8().toUInt();
QString  IDSplit0 = ID.split('-').at(0);
unsigned char IDHSend = IDSplit0.toInt(nullptr,16);

④ unchar转QString

unsigned char buf[8];
uncharToQstring(buf,8);
void ParameterPanel::uncharToQstring(unsigned char * id,int len)
{
    QString temp,msg;
    int j = 0;

    while (j<len)
    {
        temp = QString("%1").arg((int)id[j], 2, 16, QLatin1Char('0'));
        msg.append(temp);
        j++;
    }
}

⑤char转int

char charFour[4];
int charInt= CharToIntTable(charFour,4);
int CharToIntTable(char * bytesCharFour,int length)
{
    int b[20] = { 0 };//将十六进制数转成int类型
    int c = 0;//最终的十进制数
    for(int i = 0; i < length; i++)//将其从char类型转成int类型，并存入数组b[]中
    {
        if ((*(bytesCharFour+i) >= 'a') && (*(bytesCharFour+i) <= 'f'))
        {
            b[i] = *(bytesCharFour+i) - 'a' + 10;
        }
        if ((*(bytesCharFour+i) >= '0') && (*(bytesCharFour+i) <= '9'))
        {
            b[i] = *(bytesCharFour+i) - '0';
        }
    }
    //将每一位都转成16进制
    for(int i = 0; i < length; i++)//十进制转十六进制和十六进制转十进制是互逆的
    {
        b[i] = b[i] * pow( 16 , (length -1 - i));
    } 
    for (int j = 0;j<length;j++)//直接累加
    {
        c += b[j];
    }
    return c;
}

⑥QByteArray转16进制

QByteArray bytes;
bytes = port1->readAll();
QByteArray bytesHEX = bytes.toHex();

相关解决方法可借鉴网址如下：
关于QByteArray存储十六进制 与十六进制互转
Qt中QString与int,char等互转