How to handle downloading in GeckoFX 29

Question

How can I handle downloading in GeckoFx I'm using version 29 I've found some ways like adding event of
LauncherDialog_Download(object sender, LauncherDialogEvent e) But, I'm not able to add handler for this event

I tried this for handler

LauncherDialogFactory.Register();
LauncherDialog.Download += LauncherDialog_Download;

But, it is showing as error, how can i add handler
and is there any other ways to handle downloading in GeckoFx 29?

Answer 1

In form load after your

browser.navigate("http://www.domain.com");

Use this:

LauncherDialog.Download += LauncherDialog_Download;

Create LauncherDialog_Download

void LauncherDialog_Download(object sender, LauncherDialogEvent e)
    {
        nsILocalFile objTarget = Xpcom.CreateInstance<nsILocalFile>("@mozilla.org/file/local;1");

        using (nsAString tmp = new nsAString(@Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "\temp.tmp"))
        {
            objTarget.InitWithPath(tmp);
        }

        //Save file dialog
        Stream myStream;
        SaveFileDialog saveFileDialog1 = new SaveFileDialog();

        saveFileDialog1.Filter = "All files (*.*)|*.*";
        saveFileDialog1.FilterIndex = 2;
        saveFileDialog1.RestoreDirectory = true;
        saveFileDialog1.FileName = e.Filename;

        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
            if ((myStream = saveFileDialog1.OpenFile()) != null)
            {
                nsIURI source = IOService.CreateNsIUri(e.Url);
                nsIURI dest = IOService.CreateNsIUri(new Uri(@saveFileDialog1.FileName).AbsoluteUri);
                nsAStringBase t = (nsAStringBase)new nsAString(System.IO.Path.GetFileName(@saveFileDialog1.FileName));

                nsIWebBrowserPersist persist = Xpcom.CreateInstance<nsIWebBrowserPersist>("@mozilla.org/embedding/browser/nsWebBrowserPersist;1");
                nsIDownloadManager DownloadMan = null;
                DownloadMan = Xpcom.CreateInstance<nsIDownloadManager>("@mozilla.org/download-manager;1");
                nsIDownload download = DownloadMan.AddDownload(0, source, dest, t, e.Mime, 0, null, (nsICancelable)persist, false);

                if (download != null)
                {
                    persist.SetPersistFlagsAttribute(2 | 32 | 16384);
                    persist.SetProgressListenerAttribute((nsIWebProgressListener)download);
                    persist.SaveURI(source, null, null, null, null, (nsISupports)dest, null);
                }

                myStream.Close();
            }
        }
    }

The above code also triggers saveFileDialog so your program will ask where you want to save the file.

Tested and working with GeckoFX 31 and 33 but should work in 29 as well. If it doesn't, download the latest GeckoFX from here.

And Xulrunner from here.

Answer 2

Jonathan's solution doesn't work with geckoFX 45 - it seems they changed some of the libraries and deprecated the download manager. Here is the same event snippet updated to work with GeckoFX 45

    private void LauncherDialog_Download(object sender, Gecko.LauncherDialogEvent e)
    {
        nsILocalFile objTarget = Xpcom.CreateInstance<nsILocalFile>("@mozilla.org/file/local;1");

        using (nsAString tmp = new nsAString(@Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + "\temp.tmp"))
        {
            objTarget.InitWithPath(tmp);
        }

        //Save file dialog
        Stream myStream;
        SaveFileDialog saveFileDialog1 = new SaveFileDialog();

        saveFileDialog1.Filter = "All files (*.*)|*.*";
        saveFileDialog1.FilterIndex = 2;
        saveFileDialog1.RestoreDirectory = true;
        saveFileDialog1.FileName = e.Filename;

        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
            if ((myStream = saveFileDialog1.OpenFile()) != null)
            {
                nsIURI source = IOService.CreateNsIUri(e.Url);
                nsIURI dest = IOService.CreateNsIUri(new Uri(@saveFileDialog1.FileName).AbsoluteUri);
                nsAStringBase t = (nsAStringBase)new nsAString(System.IO.Path.GetFileName(@saveFileDialog1.FileName));

                nsIWebBrowserPersist persist = Xpcom.CreateInstance<nsIWebBrowserPersist>("@mozilla.org/embedding/browser/nsWebBrowserPersist;1");

                nsITransfer nst = Xpcom.CreateInstance<nsITransfer>("@mozilla.org/transfer;1");
                nst.Init(source, dest, t, e.Mime, 0, null, persist, false);

                if (nst != null)
                {
                    persist.SetPersistFlagsAttribute(2 | 32 | 16384);
                    persist.SetProgressListenerAttribute((nsIWebProgressListener)nst);
                    persist.SaveURI(source, null, null, (uint)Gecko.nsIHttpChannelConsts.REFERRER_POLICY_NO_REFERRER, null, null, (nsISupports)dest, null);
                }

                myStream.Close();
            }
        }
    }

Answer 3

Another way:

 private void LauncherDialog_Download(object sender, Gecko.LauncherDialogEvent e)
 {
     SaveFileDialog saveFileDialog1 = new SaveFileDialog();

     saveFileDialog1.Filter = "All files (*.*)|*.*";
     saveFileDialog1.FilterIndex = 2;
     saveFileDialog1.RestoreDirectory = true;
     saveFileDialog1.FileName = e.Filename;

     if (saveFileDialog1.ShowDialog() == DialogResult.OK)
     {
         nsILocalFile objTarget = Xpcom.CreateInstance<nsILocalFile>("@mozilla.org/file/local;1");

         using(nsAString tmp = new nsAString(saveFileDialog1.FileName))
         {
             objTarget.InitWithPath(tmp);
         }
         e.HelperAppLauncher.SaveToDisk(objTarget, false);
     }
}