比如我，我用qt程序去读取一个.txt文件，当这个文件有改动时就响应，有什么 好的法子？
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QFileSystemWatcher 类
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不过这是在QT4.7
void QFileSystemWatcher::fileChanged ( const QString & path ) [signal]
This signal is emitted when the file at the specified path is modified, renamed or removed from disk.