文章目录

一、获取系统的文件夹显示

UI设计

创建项目并进行简单的布局

Qt（八）文件夹与文件（文件读写）_开发语言

代码开发

mainwindow.h

#ifndef
#define

#include <QMainWindow>
#include <QFileSystemModel>
#include <QDir>

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_treeView_clicked(const QModelIndex &index);

private:
    QFileSystemModel* fileModel;
    Ui::MainWindow *ui;
};
#endif// MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    fileModel = new QFileSystemModel(this);
    fileModel->setRootPath(QDir::currentPath());
    ui->treeView->setModel(fileModel);
    ui->listView->setModel(fileModel);
    ui->tableView->setModel(fileModel);

    ui->tableView->verticalHeader()->setVisible(false);
    connect(ui->treeView, SIGNAL(clicked(QModelIndex)), ui->listView, SLOT(setRootIndex(QModelIndex)));
    connect(ui->treeView, SIGNAL(clicked(QModelIndex)), ui->tableView, SLOT(setRootIndex(QModelIndex)));

}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_treeView_clicked(const QModelIndex &index)
{
    QString viewName = fileModel->fileName(index);
    QString viewPath = fileModel->filePath(index);
    QString viewType = fileModel->type(index);
    unsigned viewSize = fileModel->size(index)/1024;
    QString printSize;
    if (viewSize>1024)
        printSize = QString::asprintf("%.2f MB",(float)viewSize/1024);
    else
        printSize = QString::asprintf("%d KB", viewSize);
    QString print_info = QString::fromUtf8("File_Info: %1  %2  %3  %4")
            .arg(viewName)
            .arg(viewPath)
            .arg(viewType)
            .arg(printSize);
    ui->statusbar->showMessage(print_info);
}

演示效果

Qt（八）文件夹与文件（文件读写）_#include_02

二、文件读写

UI设计

Qt（八）文件夹与文件（文件读写）_ui设计_03


main.cpp

#include "mainwindow.h"

#include <QApplication>
#include <QTextCodec>

int main(int argc, char *argv[])
{
    //解决汉字乱码问题
    QTextCodec *codec = QTextCodec::codecForName("UTF-8");
    QTextCodec::setCodecForLocale(codec);

    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef
#define

#include <QMainWindow>

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_actOpenFile_triggered();
    void on_actSave_triggered();
    void on_actOpenStream_triggered();
    void on_actSaveStream_triggered();

private:
    Ui::MainWindow *ui;
};
#endif// MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
#include <QTextStream>


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_actOpenFile_triggered()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString dilTile = "打开文件";
    QString filter = "程序(*.h *.cpp);;文本(*.txt);;所有文件(*.*)";
    QString filename = QFileDialog::getOpenFileName(this,dilTile,curPath,filter);

    if(filename.isEmpty()) return;

    QFile file(filename);
    if(file.open(QIODevice::ReadOnly|QIODevice::Text)){
        ui->plainTextEditIODivice->setPlainText(
                    QString::fromLocal8Bit(file.readAll()));
        file.close();
        ui->tabWidget->setCurrentIndex(0);
    }
}

void MainWindow::on_actSave_triggered()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString dilTile = "保存文件";
    QString filter = "程序(*.h *.cpp);;文本(*.txt);;所有文件(*.*)";
    QString filename = QFileDialog::getSaveFileName(this,dilTile,curPath,filter);

    if(filename.isEmpty()) return;

    QFile file(filename);
    if(file.open(QIODevice::WriteOnly|QIODevice::Text)){
        QString str = ui->plainTextEditIODivice->toPlainText();
        QByteArray strBytes = str.toUtf8();
        file.write(strBytes,strBytes.length());
        ui->tabWidget->setCurrentIndex(0);
    }
}

void MainWindow::on_actOpenStream_triggered()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString dilTile = "打开文件";
    QString filter = "程序(*.h *.cpp);;文本(*.txt);;所有文件(*.*)";
    QString filename = QFileDialog::getOpenFileName(this,dilTile,curPath,filter);

    if(filename.isEmpty()) return;

    QFile file(filename);
    if(file.open(QIODevice::ReadOnly|QIODevice::Text)){
        QTextStream txtstream(&file);
        txtstream.setAutoDetectUnicode(true);
        while (!txtstream.atEnd()) {
            ui->plainTextEditTextStream->appendPlainText(txtstream.readLine());
        }
        //ui->plainTextEditTextStream->setPlainText(txtstream.readAll());
        file.close();
        ui->tabWidget->setCurrentIndex(1);
    }
}

void MainWindow::on_actSaveStream_triggered()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString dilTile = "保存文件";
    QString filter = "程序(*.h *.cpp);;文本(*.txt);;所有文件(*.*)";
    QString filename = QFileDialog::getSaveFileName(this,dilTile,curPath,filter);

    if(filename.isEmpty()) return;

    QFile file(filename);
    if(file.open(QIODevice::WriteOnly|QIODevice::Text)){
        QTextStream txtstream(&file);
        txtstream.setAutoDetectUnicode(true);
        QString str = ui->plainTextEditTextStream->toPlainText();

        txtstream << str;
        ui->tabWidget->setCurrentIndex(1);
    }
}

演示效果

Qt（八）文件夹与文件（文件读写）_ui设计_04

三、文件目录

获取目录所有文件，双击打开文件

UI设计

Qt（八）文件夹与文件（文件读写）_qt_05


mainwindow.h

#ifndef
#define

#include <QMainWindow>
#include <QFileDialog>
#include <QDir>
#include <QFile>
#include <QIODevice>
#include <QStringList>
#include <QStringLiteral>
#include <QListWidgetItem>
#include <QMessageBox>

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_actOpenFile_triggered();

    void on_actOpenDir_triggered();

    void on_listWidget_itemDoubleClicked(QListWidgetItem *item);

    void on_listWidget_itemClicked(QListWidgetItem *item);

private:
    Ui::MainWindow *ui;
};
#endif// MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowTitle(QString::fromLocal8Bit("单击显示文件路径_双击打开文件"));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_actOpenFile_triggered()
{
    QString curPath = QCoreApplication::applicationDirPath();
    QString dilTile = QString::fromLocal8Bit("打开文件");
    QString filter = QString::fromLocal8Bit("程序(*.h *.cpp);;文本(*.txt);;所有文件(*.*)");
    QStringList filenames = QFileDialog::getOpenFileNames(this,dilTile,curPath,filter);
    ui->listWidget->addItems(filenames);

}

void MainWindow::on_actOpenDir_triggered()
{
    QString file_path = QFileDialog::getExistingDirectory(this, QString::fromLocal8Bit("Select Folder"),QDir::currentPath());
    if(file_path.isEmpty()) return;

    QDir dir(file_path);
    QStringList filters;
    filters << "*.h" << "*.cpp";

    //获取文件夹下所有文件名
    //QStringList files = dir.entryList(filters, QDir::Files|QDir::Readable);
    //ui->listWidget->addItems(files);

    //获取文件夹下所有文件详情
    QFileInfoList list = dir.entryInfoList(filters);
    for(int i=0; i<list.length() ;i++){
        QFileInfo tmpFileInfo = list.at(i);
        if(tmpFileInfo.isFile()){
            QString fileName = tmpFileInfo.filePath();
            ui->listWidget->addItem(fileName);
        }
    }
}

void MainWindow::on_listWidget_itemDoubleClicked(QListWidgetItem *item)
{
    if(item->text().isEmpty()) return;
    QFile file(item->text());
    if(file.open(QIODevice::ReadOnly|QIODevice::Text)){
        ui->textEdit->setText(QString::fromLocal8Bit(file.readAll()));
        file.close();
    }
}


void MainWindow::on_listWidget_itemClicked(QListWidgetItem *item)
{
    if(item->text().isEmpty()) return;
    ui->statusbar->showMessage(item->text());
}

演示效果

Qt（八）文件夹与文件（文件读写）_ui_06