22.监视文件

• mainwindow.h

  #ifndef MAINWINDOW_H
  #define MAINWINDOW_H
  
  #include <QMainWindow>
   5 #include <QFileSystemWatcher>
   6 #include <QLabel>
  
  namespace Ui {
  class MainWindow;
  }
  
  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  
  public:
      explicit MainWindow(QWidget *parent = 0);
      ~MainWindow();
  
  20 private slots:
  21     void directoryChanged(QString path);
  
  private:
      Ui::MainWindow *ui;
  25     QFileSystemWatcher fsspy;
  26     QLabel *label;
  };
  
  #endif // MAINWINDOW_H

• mainwindow.cpp

  #include "mainwindow.h"
  #include "ui_mainwindow.h"
  #include <QMessageBox>
  #include <QDir>
  #include <QVBoxLayout>
  #include <QDebug>
  
   8 MainWindow::MainWindow(QWidget *parent) :
   9     QMainWindow(parent),
  10     ui(new Ui::MainWindow)
  11 {
  12     ui->setupUi(this);
  13 
  14     //获取指定目录
  15     QStringList args = qApp->arguments();
  16     QString path;
  17     if(args.count()>1)
  18     {
  19         path=args[1];
  20     }
  21     else
  22     {
  23         path = QDir::currentPath();
  24     }
  25 
  26     label = new QLabel(this);
  27     label->setText("spypath"+path);
  28     QVBoxLayout *layout = new QVBoxLayout(this);
  29     layout->addWidget(label);
  30     qDebug() << path;
  31     fsspy.addPath(path);
  32     connect(&fsspy,SIGNAL(directoryChanged(QString)),this,SLOT(directoryChanged(QString)));
  33 }
  
  MainWindow::~MainWindow()
  {
      delete ui;
  }
  
  //触发监视
  41 void MainWindow::directoryChanged(QString path)
  42 {
  43     QMessageBox::information(NULL,"changes",path);
  44 }