B4J Question WebApp - WebSocket - Download mp3 directly and not stream

hatzisn said:

Hello, I tried to do what I mentioned in the title with the following code and I cannot. When I tried the code in the following thread a new window opens and tries to stream the mp3. Any suggestions?

[WebApp] Download or Open new browser tab to view file

I have a WebSocket Class that generates a pdf report and saves it to a browser accessible location based on dynamically generated (from this same WebSocket class) controls to get report parameter input from the browser user. I can WebUtils.redirect to the generated pdf file but I want to either...

www.b4x.com

Click to expand...

I think it is because of browser setting... you mean to "make it" just to download it...

web-page is yours ?

I found a way in StackOverflow:


Here is the modified code :


and then we run this in B4J

Johan Hormaza said:

B4X:

'Handler class Downloader
Sub Class_Globals
   
End Sub

Public Sub Initialize

End Sub

Sub Handle(req As ServletRequest, resp As ServletResponse)
    Dim Filename As String = req.GetParameter("file")
    If File.Exists("D:\LuzMSA\audios",Filename) Then
        Dim in As InputStream = File.OpenInput("D:\LuzMSA\audios",Filename)
        File.Copy2(in,resp.OutputStream)
        Log("Descargar: " & Filename)
    Else
        Dim in As InputStream = File.OpenInput(File.DirAssets,"NO.png")
        File.Copy2(in,resp.OutputStream)
        Log("No existe este archivo: " & Filename)'Firma123456789123456789.png
    End If
End Sub

Click to expand...

Thank you, very useful. Mine though was kind of a different problem. In a websocket application there is no response object to copy the stream of the file. Nevertheless it is a clever way to do this and searching the web in the morning I found that adding contenttype=application/octet-stream and the header content-disposition =attachment;filename:heregoesthefilename can be saved as a downloaded file. Using only the prementioned contenttype it only writes the bytes to the stream which then you reassemble in the receiving part.