qz-download.cpp

    DownloadManager::DownloadInfo info;
    info.page = page(); // QWebPage*
    info.suggestedFileName = suggestedFileName;
    info.askWhatToDo = false;
    info.forceChoosingPath = true;

    DownloadManager* dManager = mApp->downManager();
    dManager->download(request, info);