QT5笔记： 30. 二进制文件读写

合集 - Qt入门(36)

1.QT5笔记：1.UI文件设计与运行机制2022-05-022.QT5笔记：2.可视化UI设计2022-05-023.QT5笔记：6. QT 与 C++2023-03-154.QT5笔记：5. QtCreator 的快捷键2023-03-155.QT5笔记：4. 设置应用图标2022-05-026.QT5笔记：3.手动撸界面和可视化托界面混合2022-05-027.QT5笔记： 14. SpinBox的常用功能2023-03-158.QT5笔记：13. QString 的常用功能2023-03-159.QT5笔记：12. 字符串和数值之间的转换2023-03-1510.QT5笔记：11. Qt类库的模块2023-03-1511.QT5笔记：10. 容器类的迭代2023-03-1512.QT5笔记：9. QT的容器类2023-03-1513.QT5笔记： 8. QT的全局变量（基本数据类型、函数、宏）2023-03-1514.QT5笔记：7. 自定义类、自定义信号及类的元对象信息2023-03-15

15.QT5笔记： 30. 二进制文件读写2023-03-16

16.QT5笔记： 29. 文本文件读写2023-03-1617.QT5笔记： 28. SplashWindow 没听懂，无内容2023-03-1618.QT5笔记：27. MDI应用程序设计2023-03-1619.QT5笔记： 26. 多窗体应用程序设计2023-03-1620.QT5笔记： 25. 非模态的自定义对话框2023-03-1621.QT5笔记：24. 自定义对话框以及模态 调用2023-03-1622.QT5笔记： 23. 标准对话框2023-03-1623.QT5笔记： 22. 自定义代理2023-03-1624.QT5笔记： 21. QStandardItemModel2023-03-1625.QT5笔记： 20. QStringListModel的使用2023-03-1626.QT5笔记： 19. QFileSystemModel 联动 QListView QTableView QTreeView2023-03-1627.QT5笔记：18 QPainter基本绘图2023-03-1528.QT5笔记：17. QComboBox和QPlainTextEdit2023-03-1529.QT5笔记： 16. 时间和定时器的常用功能2023-03-1530.QT5笔记： 15. 其他显示组件的常用功能2023-03-1531.QT5笔记：36. QGraphicsView 综合示例 （完结撒花！）2023-03-1632.QT5笔记： 35. QGraphicsView 视图2023-03-1633.QT5笔记：34. 视口和窗口2023-03-1634.QT5笔记：33. 坐标系统和坐标变换2023-03-1635.QT5笔记： 32. QPainter 基本绘制2023-03-1636.QT5笔记： 31. 文件目录操作2023-03-16

收起

1. Qt 预定义类型文件 *.stm
2. 标准二进制文件 *.dat

例子：

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QItemSelectionModel>
#include <QMainWindow>
#include <QStandardItemModel>
 
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
 
private slots:
    void on_actOpen_triggered();
 
    void on_actSave_triggered();
 
    void on_actOpenBin_triggered();
 
    void on_actSaveBin_triggered();
 
    void on_actTabReset_triggered();
 
private:
    Ui::MainWindow *ui;
 
    QStandardItemModel *model;
    QItemSelectionModel *selectModel;
 
 
    void defaultTable(int rowNumber);
};
#endif // MAINWINDOW_H
 

MainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
#include <QFileDialog>
#include <QDebug>
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    model = new QStandardItemModel(this);
    model->setRowCount(10);
    QStringList     headerList;
    headerList << "测深(m)" << "垂深(m)" << "方位(°)" << "总位移(m)" << "固井质量" << "测井取样";
    model->setHorizontalHeaderLabels(headerList); //设置表头文字
    selectModel = new QItemSelectionModel(model);
    ui->tableView->setModel(model);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
 
void MainWindow::on_actOpen_triggered()//打开stm，二进制读写，怎么写就怎么读，不然会导致乱码
{
    QString path = QCoreApplication::applicationDirPath();
    QString fileName = QFileDialog::getOpenFileName(this, "", path, "Qt 预定义编码(*.stm)");
    if (!fileName.isEmpty()) {//
        QFile file(fileName);
        if (file.open(QIODevice::ReadOnly)) {
            QDataStream stream(&file);
            stream.setVersion(QDataStream::Qt_5_12);//指定Qt读写版本号
            qint16 rowCount, colCount;
            stream >> rowCount;
            stream >> colCount;
            defaultTable(rowCount);
            QString str;
            for (int i = 0; i < colCount; i++) {
                stream >> str;
            }
            //数据区域
            qint16 depth;
            qreal meaDepth, direction, offSet;
            QString quality;
            bool sample;
            QModelIndex index = model->index(0, 0);
            QStandardItem *item = model->itemFromIndex(index);
            for (int i = 0; i < rowCount; i++) {
                stream >> depth;
                index = model->index(i, 0);
                item = model->itemFromIndex(index);
                item->setData(depth, Qt::DisplayRole);
 
                stream >> meaDepth;
                index = model->index(i, 1);
                item = model->itemFromIndex(index);
                item->setData(meaDepth, Qt::DisplayRole);
 
                stream >> direction;
                index = model->index(i, 2);
                item = model->itemFromIndex(index);
                item->setData(depth, Qt::DisplayRole);
 
                stream >> offSet;
                index = model->index(i, 3);
                item = model->itemFromIndex(index);
                item->setData(offSet, Qt::DisplayRole);
 
                stream >> quality;
                index = model->index(i, 4);
                item = model->itemFromIndex(index);
                item->setData(quality, Qt::DisplayRole);
 
                stream >> sample;
                index = model->index(i, 5);
                item = model->itemFromIndex(index);
                item->setCheckState(sample ? Qt::Checked : Qt::Unchecked);
            }
            file.close();
        }
    }
}
 
void MainWindow::on_actSave_triggered()//保存stm，二进制写入
{
    QString path = QCoreApplication::applicationDirPath();
    QString fileName = QFileDialog::getSaveFileName(this, "", path, "Qt 预定义编码(*.stm)");//保存stm文件
    if (!fileName.isEmpty()) {
        QFile file(fileName);
        if (file.open(QIODevice::ReadWrite | QIODevice::Truncate)) {
            QDataStream stream(&file);
            stream.setVersion(QDataStream::Qt_5_12);//指定Qt读写版本号，不写会有默认值
            qint16 row = model->rowCount();
            stream << row;
            qint16 col = model->columnCount();
            stream << col;
            for (int i = 0; i < model->columnCount(); i++) {
                stream << model->horizontalHeaderItem(i)->text();
            }
 
            for (int i = 0; i < model->rowCount(); i++) {
                qint16 dep = model->item(i, 0)->data(Qt::DisplayRole).toInt();
                stream << dep;
                qreal meaDep = model->item(i, 1)->data(Qt::DisplayRole).toFloat();
                stream << meaDep;
                qreal direc = model->item(i, 2)->data(Qt::DisplayRole).toFloat();
                stream << direc;
                qreal offset = model->item(i, 3)->data(Qt::DisplayRole).toFloat();
                stream << offset;
                QString quality = model->item(i, 4)->data(Qt::DisplayRole).toString();
                stream << quality;
                bool sample = model->item(i, 5)->checkState() == Qt::Checked;
                stream << sample;
            }
 
            file.close();
        }
    }
}
 
void MainWindow::on_actOpenBin_triggered()   //打开data，不是Qt预定义的类型了
{
    QString path = QCoreApplication::applicationDirPath();
    QString fileName = QFileDialog::getOpenFileName(this, "", path, "标准编码(*.dat)");
    if (!fileName.isEmpty()) {//
        QFile file(fileName);
        if (file.open(QIODevice::ReadOnly)) {
            QDataStream stream(&file);
            stream.setByteOrder(QDataStream::LittleEndian);
            qint16 rowCount, colCount;
            stream.readRawData((char *)&rowCount, sizeof(qint16));
            stream.readRawData((char *)&colCount, sizeof(qint16));
            defaultTable(rowCount);
            //表头
            char *buffer;
            uint length;
            for (int i = 0; i < colCount; i++) {
                stream.readBytes(buffer, length);
                QString str = QString::fromLocal8Bit(buffer, length);
            }
 
            //数据区域
            qint16 depth;
            qreal meaDepth, direction, offSet;
            QString quality;
            qint8 sample;//布尔大小
            QModelIndex index = model->index(0, 0);
            QStandardItem *item = model->itemFromIndex(index);
            for (int i = 0; i < rowCount; i++) {
                stream.readRawData((char *)&depth, sizeof(qint16));
                index = model->index(i, 0);
                item = model->itemFromIndex(index);
                item->setData(depth, Qt::DisplayRole);
 
                stream.readRawData((char *)&meaDepth, sizeof(qreal));
                index = model->index(i, 1);
                item = model->itemFromIndex(index);
                item->setData(meaDepth, Qt::DisplayRole);
 
                stream.readRawData((char *)&direction, sizeof(qreal));
                index = model->index(i, 2);
                item = model->itemFromIndex(index);
                item->setData(direction, Qt::DisplayRole);
 
                stream.readRawData((char *)&offSet, sizeof(qreal));
                index = model->index(i, 3);
                item = model->itemFromIndex(index);
                item->setData(offSet, Qt::DisplayRole);
 
                stream.readBytes(buffer, length);
                quality = QString::fromLocal8Bit(buffer, length);
                index = model->index(i, 4);
                item = model->itemFromIndex(index);
                item->setData(quality, Qt::DisplayRole);
 
                stream.readRawData((char *)&sample, sizeof(qint8));
                index = model->index(i, 5);
                item = model->itemFromIndex(index);
                item->setCheckState(sample ? Qt::Checked : Qt::Unchecked);
            }
            file.close();
        }
    }
}
 
void MainWindow::on_actSaveBin_triggered()   //保存data
{
    QString path = QCoreApplication::applicationDirPath();
    QString fileName = QFileDialog::getSaveFileName(this, "", path, "Qt 预定义编码(*.dat)");//保存stm文件
    if (!fileName.isEmpty()) {
        QFile file(fileName);
        if (file.open(QIODevice::ReadWrite | QIODevice::Truncate)) {
            QDataStream stream(&file);
            stream.setByteOrder(QDataStream::LittleEndian);
            qint16 row = model->rowCount();
            qint16 col = model->columnCount();
            stream.writeRawData((char *)&row, sizeof(qint16));
            stream.writeRawData((char *)&col, sizeof(qint16));
            for (int i = 0; i < model->columnCount(); i++) {
                QString str = model->horizontalHeaderItem(i)->text();
                QByteArray arr = str.toUtf8();
                stream.writeBytes(arr, arr.length());
            }
 
            for (int i = 0; i < model->rowCount(); i++) {
                qint16 dep = model->item(i, 0)->data(Qt::DisplayRole).toInt();
                stream.writeRawData((char *)&dep, sizeof(qint16));
                qreal meaDep = model->item(i, 1)->data(Qt::DisplayRole).toFloat();
                stream.writeRawData((char *)&meaDep, sizeof(qreal));
                qreal direc = model->item(i, 2)->data(Qt::DisplayRole).toFloat();
                stream.writeRawData((char *)&direc, sizeof(qreal));
                qreal offset = model->item(i, 3)->data(Qt::DisplayRole).toFloat();
                stream.writeRawData((char *)&offset, sizeof(qreal));
                QString quality = model->item(i, 4)->data(Qt::DisplayRole).toString();
                stream.writeBytes(quality.toUtf8(), sizeof(quality.toUtf8().length()));
                qint8 sample = model->item(i, 5)->checkState() == Qt::Checked ? 1 : 0;
                stream.writeRawData((char *)&sample, sizeof(qint8));
            }
 
            file.close();
        }
    }
}
 
void MainWindow::on_actTabReset_triggered()   //表格复位
{
    defaultTable(8);
}
 
void MainWindow::defaultTable(int rowNumber)   //默认表格样式
{
    model->removeRows(0, model->rowCount());
    model->setRowCount(rowNumber);
    for (int i = 0; i < rowNumber; i++) {
        QModelIndex index = model->index(i, model->columnCount() - 1);
        QStandardItem *item = model->itemFromIndex(index);
        item->setCheckable(true);
        item->setEditable(false);
        item->setText(model->headerData(model->columnCount() - 1, Qt::Horizontal).toString());
    }
}

界面

__EOF__

本文作者：echo_lovely
本文链接：https://www.cnblogs.com/echo-lovely/p/17222241.html
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