Question

我需要监控某个文件夹并找出是否有新文件添加到该文件夹中，之后我会询问用户是否要打印该文件。问题在于QFileSystemWatcher，我无法弄清楚如何获取已添加的文件的名称。我尝试了这段代码（见后文），但file_changed函数不会对任何文件夹更改做出反应。 directory_changed函数有效。

如何获取已添加文件的名称以及如何捕获Signal / Boolean，以便在添加文件时我可以触发MessageBox和我的系统托盘消息（参见代码）。非常感谢，对于糟糕的代码感到抱歉，我是Qt的新手。请不要指向C ++示例，我不理解它们。

 
import sys
from PyQt4.QtGui import *
from PyQt4 import QtCore

# create a system tray message
class SystemTrayIcon(QSystemTrayIcon):
    def __init__(self, parent=None):
        QSystemTrayIcon.__init__(self, parent)
        #self.setIcon(QIcon.fromTheme("document-save"))
        self.setIcon(QIcon("C:\Icon2.ico"))

    def welcome(self):
        self.showMessage("New PayFile found!", "We found a new PayFile.")

    def show(self):
        QSystemTrayIcon.show(self)
        QtCore.QTimer.singleShot(100, self.welcome)

# QFileSystemWatcher with signals

@QtCore.pyqtSlot(str)
def directory_changed(path):
    print('Directory Changed: ', path)

@QtCore.pyqtSlot(str)
def file_changed(path):
    print('File Changed: ', path)

'''
# QFileSystemWatcher without signals
def directory_changed(path):
    print('Directory Changed: %s' % path)

def file_changed(path):
    print('File Changed: %s' % path)
'''

if __name__ == '__main__':

    a = QApplication(sys.argv)

    # add a folder path here
    fs_watcher = QtCore.QFileSystemWatcher(['C:\\Folder'])

    # without signals
    fs_watcher.directoryChanged.connect(directory_changed)
    # this doesn't work, I don't get the name of the added file
    fs_watcher.fileChanged.connect(file_changed)

    # with signals
    #fs_watcher.connect(fs_watcher, QtCore.SIGNAL('directoryChanged(QString)'), directory_changed)
    # this doesn't work, I don't get the name of the added file
    #fs_watcher.connect(fs_watcher, QtCore.SIGNAL('fileChanged(QString)'), file_changed)

    # how can I find out whether a new file has been added ???
    if fs_watcher.directoryChanged.connect(directory_changed):

        tray = SystemTrayIcon()
        tray.show()

        print_msg = "Would you like to do something with the file?"
        reply = QMessageBox.question(None, 'Print The File', print_msg, QMessageBox.Yes, QMessageBox.No)

        if reply == QMessageBox.Yes:
            print "I said yes"
            # do stuff
            # print the file

        if reply == QMessageBox.No:
            print "No"

    sys.exit(a.exec_())

Answer 1

文件系统观察程序仅通知您目录已更改，而其中已更改。收到通知后，您必须迭代目录中的项目，并确定是否发生了一些有趣的事情。

可能会发现QFileSystemModel会更有用，因为当目录获得新成员时它会发出rowAdded信号。它已经迭代了目录成员并确定了文件系统观察者限制的变化 - 如果你直接使用QFileSystemWatcher，它几乎可以做你需要做的事情。

PyQt，QFileSystemWatcher不捕获添加的文件

1 个答案: