Qt利用QFileSystemWatcher对文件或目录监听fileChanged

相关资料：

https://blog.csdn.net/liang19890820/article/details/51849252

.pro

 1 QT       += core gui
 2 
 3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 4 
 5 CONFIG += c++11
 6 
 7 # The following define makes your compiler emit warnings if you use
 8 # any Qt feature that has been marked deprecated (the exact warnings
 9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12 
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
17 
18 SOURCES += \
19     main.cpp \
20     mainwindow.cpp
21 
22 HEADERS += \
23     mainwindow.h
24 
25 FORMS += \
26     mainwindow.ui
27 
28 # Default rules for deployment.
29 qnx: target.path = /tmp/$${TARGET}/bin
30 else: unix:!android: target.path = /opt/$${TARGET}/bin
31 !isEmpty(target.path): INSTALLS += target
View Code

main.cpp

 1 #include "mainwindow.h"
 2 
 3 #include <QApplication>
 4 
 5 int main(int argc, char *argv[])
 6 {
 7     QApplication a(argc, argv);
 8     MainWindow w;
 9     w.show();
10     return a.exec();
11 }
View Code

mainwindow.h

 1 #ifndef MAINWINDOW_H
 2 #define MAINWINDOW_H
 3 
 4 #include <QMainWindow>
 5 
 6 #include <QFileSystemWatcher>
 7 #include <QDebug>
 8 #include <QFile>
 9 #include <QStringList>
10 #include <QString>
11 
12 
13 QT_BEGIN_NAMESPACE
14 namespace Ui { class MainWindow; }
15 QT_END_NAMESPACE
16 
17 class MainWindow : public QMainWindow
18 {
19     Q_OBJECT
20 
21 public:
22     MainWindow(QWidget *parent = nullptr);
23     ~MainWindow();
24 
25     void SaveCameraConfig(QStringList strliConfig);
26 
27 private slots:
28     void on_fileChanged(const QString &path);
29     void on_directoryChanged(const QString &path);
30 
31     void on_pushButton_clicked();
32 
33 private:
34     Ui::MainWindow *ui;
35 
36     QFileSystemWatcher *m_FileWatcher;
37     QStringList m_listOfConfig;
38 };
39 #endif // MAINWINDOW_H
View Code

mainwindow.cpp

 1 #include "mainwindow.h"
 2 #include "ui_mainwindow.h"
 3 
 4 MainWindow::MainWindow(QWidget *parent)
 5     : QMainWindow(parent)
 6     , ui(new Ui::MainWindow)
 7 {
 8     ui->setupUi(this);
 9 
10     m_FileWatcher = new QFileSystemWatcher();
11     m_FileWatcher->addPath("d:/");
12     m_FileWatcher->addPath("d:/log.txt");
13 
14     connect(m_FileWatcher, &QFileSystemWatcher::fileChanged, this, &MainWindow::on_fileChanged);
15     connect(m_FileWatcher, &QFileSystemWatcher::directoryChanged, this, &MainWindow::on_directoryChanged);
16 }
17 
18 MainWindow::~MainWindow()
19 {
20     delete ui;
21 }
22 
23 void MainWindow::SaveCameraConfig(QStringList strliConfig)
24 {
25     QStringList strList;
26     QString strFileName = "d:/log.txt";
27     QFile file(strFileName);
28     if (file.open(QFile::WriteOnly)) {
29         for (int i = 0; i < strliConfig.size(); i++) {
30             QString str = strliConfig[i] + "\r\n";
31             file.write(str.toStdString().c_str());
32         }
33         file.close();
34     }
35 }
36 
37 void MainWindow::on_directoryChanged(const QString &path)
38 {
39     qDebug() << QStringLiteral("目录发生改变--") << path;
40 }
41 
42 void MainWindow::on_fileChanged(const QString &path)
43 {
44     qDebug() << QStringLiteral("file发生改变--") << path;
45 }
46 
47 void MainWindow::on_pushButton_clicked()
48 {
49     int num = m_listOfConfig.size();
50     m_listOfConfig.append(QString::number(num));
51     SaveCameraConfig(m_listOfConfig);
52 }
View Code

 

posted on 2021-04-16 16:43  疯狂delphi  阅读(479)  评论(6)  编辑  收藏  举报

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