QWebEnginePage and printToPdf Qt 5.7 issue



  • Hi guys… I’m trying to use this function with qt 5.7 beta

    void QWebEnginePage::printToPdf(const QString &filePath, const QPageLayout &pageLayout)
    

    but, I have a problem with it because I don’t know when the pdf generation has finished, it seem like the pdf generation is running on other thread and I can’t know when it’s finish.

    does any one has any advise to do that? how Qt 5.7 notify that the pdf was generated successful or with error using this method?

    regards



  • Yes, it runs in a separate thread. You have "2.5" choices:

    1. Upgrade to Qt 5.9, which has just added signal QWebEnginePage::pdfPrintingFinished .
    2. Use the Qt 5.7 QWebEnginePage::printToPdf(FunctorOrLambda resultCallback) overload which will call your own callback when it prints.
      2.5 Use a QFileSystemwatcher to monitor for file creation. [I am not keen on this one, e.g. QFileSystemWatcher::fileChanged() signal is probably(?) emitted as soon as file starts being written to rather than on writing completed.]

    See also my post on this forum for possible issue when waiting for printToPdf() to complete.


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