Article directory
First, get the system folder display
UI design
Create projects and make simple layouts
code development
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#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);
}
Demonstration effect
2. File reading and writing
UI design
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 MAINWINDOW_H
#define MAINWINDOW_H
#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);
}
}
Demonstration effect
3. File directory
Get all files in the directory, double-click to open the file
UI design
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#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;
}
// 关于更多使用详情，可以参考：https://blog.csdn.net/chan_qx/article/details/50950371
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());
}
Demonstration effect
