qt some datastrcut

__040711563a17902392e7

海前 王

Posted on August 23, 2024

qt some datastrcut


#if 0
#include <QCoreApplication>
#include <QByteArray>
#include <QDebug>
#include <vector>
#include <cstring>  // For memcpy
#include<iterator>
#include<QMap>
#include<QColor>
#include<QMapIterator>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // float 转 QByteArray
    float fn = 10000.0;
    QByteArray qba_f;

    // 确保 QByteArray 大小足够存储 float 数据
    qba_f.resize(sizeof(float));

    // 将 float 数据复制到 QByteArray 中
    memcpy(qba_f.data(), &fn, sizeof(float));

    // 将 QByteArray 转换成 std::vector<uint8_t>
    std::vector<uint8_t> vecf(qba_f.begin(), qba_f.end());

    // 打印 std::vector<uint8_t> 的内容
    for (uint8_t byte : vecf) {
        qDebug() << static_cast<int>(byte);  // 打印每个字节的十进制值
    }


    QByteArray arr="你好";
 //   arr.setNum(12);
    arr.push_back("c");
    qDebug()<<arr;

    arr.simplified();
      qDebug()<<arr;


      QMap<int,std::string> qmap;
      qmap.insert(1,"dd");
    qmap.insert(11,"dgd");    qmap.insert(14,"ddd");    qmap.insert(15,"ddf");
      for(auto i:qmap){
          qDebug()<<i.data();

      }
      // 使用 QMap 的迭代器进行遍历
      for (auto it = qmap.begin(); it != qmap.end(); ++it) {
        //  qDebug() << "Key:" << it.key() << "Value:" << it.value();


      }
      QColor q;

    return a.exec();
}
#endif
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QSpinBox>
#include <QVBoxLayout>
#include <QDebug>

class MainWindow : public QWidget
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr) : QWidget(parent)
    {
        QSpinBox *spinBox = new QSpinBox(this);
        QPushButton *button = new QPushButton("Print SpinBox Value", this);

        QVBoxLayout *layout = new QVBoxLayout(this);
        layout->addWidget(spinBox);
        layout->addWidget(button);

        connect(button, &QPushButton::clicked, this, &MainWindow::handleButtonClicked);
    }

private slots:
    void handleButtonClicked()
    {
        // 使用 qobject_cast 将 sender() 转换为 QSpinBox*
        QSpinBox *spinBox = qobject_cast<QSpinBox *>(sender());
        if (spinBox) {
            // 如果转换成功,输出 QSpinBox 的值
            qDebug() << "SpinBox value:" << spinBox->value();
        } else {
            qDebug() << "Sender is not a QSpinBox";
        }
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow window;
    window.show();


    return app.exec();
}
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__040711563a17902392e7
海前 王

Posted on August 23, 2024

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