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我创建了一个简单的观察者并添加了一条路径。我将观察者的信号连接到我的方法:

void CssSetter::watchIfNeeded(const QString& newPath)
{
    if(watcher==nullptr) {
      watcher = new QFileSystemWatcher(this);
      connect(watcher, &QFileSystemWatcher::fileChanged, this, &CssSetter::cssFileChanged);
    }
    watcher->addPath(newPath);
}

回调如下所示:

void CssSetter::cssFileChanged(const QString& path)
{

  qDebug()<<"CSS "<<path<<" changed!";
  QFileInfo css_file(path);
  qDebug()<<"[CSS] Watcher: "<<path<<(css_file.isFile()?" exists!":" doesn't exist!");
  // Should update CSS file, but fails because it also has `.exists()` checks inside
  setCSSFromPath(path);
}

输出是:

csssetter.cpp:81 (void CssSetter::cssFileChanged(const QString&)): CSS  "/storage/extSdCard/w98.css"  changed!
csssetter.cpp:84 (void CssSetter::cssFileChanged(const QString&)): [CSS] Watcher:  "/storage/extSdCard/w98.css"  doesn't exist!
csssetter.cpp:24 (void CssSetter::setCSSFromPath(QFile&)): [CSS]  "/storage/extSdCard/w98.css"  doesn't exist!

最后一行来自通常负责加载文件(如果存在)的函数。当我试图覆盖控件时,它不起作用。在文件观察者的回调中读取文件是不可能的

QFileSystemWatcher当报告文件已更改时,如何正确读取文件?这是故意的,还是一个错误?

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