Also note that your process may have other file descriptors open in addition to the ones for files being monitored, and these other open descriptors also count in the total. This means that addPath() and addPaths() will fail if your process tries to add more than 256 files or directories to the file system monitor. Some system limits the number of open file descriptors to 256 by default. On all BSD variants, for example, an open file descriptor is required for each monitored file. This implies there is a limit to the number of files and directories your process can monitor simultaneously. The act of monitoring files and directories for modifications consumes system resources.On systems running a Linux kernel without inotify support, file systems that contain watched paths cannot be unmounted.Note that QFileSystemWatcher stops monitoring files once they have been renamed or removed from disk, and directories once they have been removed from disk. Similarly, the directorењњhanged() signal is emitted when a directory or its contents is modified or removed. The fileChanged() signal is emitted when a file has been modified, renamed or removed from disk.

Files that have been added to the QFileSystemWatcher can be accessed using the files() function, and directories using the directories() function. QFileSystemWatcher examines each path added to it. Existing paths can be removed by using the removePath() and removePaths() functions. Multiple paths can be added using the addPaths() function. QFileSystemWatcher monitors the file system for changes to files and directories by watching a list of specified paths.Д¬all addPath() to watch a particular file or directory.

Hs filewatcher