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

[hatzisn]

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

 

[Magma]

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

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

 

[Magma]

web-page is yours ?

Force a File to Download Instead of Opening it in a Browser with HTML - Actual Wizard

In an effort to make modern browsers more user friendly, their developers have started to display content inside the web browser that used to require an additional application to view or a user may…

actualwizard.com

 

[hatzisn]

I found a way in StackOverflow:

DIV Click Download Audio File

I have this audio MP3 file and I want to have it downloaded when the user clicks a DIV using JavaScript/JQuery. $("#button").live("click",function(){ // initiate download }); Any help whatsoe...

stackoverflow.com

Here is the modified code :

    function downloadfile(dnldfilename) {
   
        var link = document.createElement('a');
        link.href = dnldfilename;
        link.setAttribute('download', dnldfilename);
        document.getElementsByTagName("body")[0].appendChild(link);
        // Firefox
        if (document.createEvent) {
            var event = document.createEvent("MouseEvents");
            event.initEvent("click", true, true);
            link.dispatchEvent(event);
        }
        // IE
        else if (link.click) {
            link.click();
        }
        link.parentNode.removeChild(link);
       
    }

and then we run this in B4J

ws.RunMethod("downloadfile", Array("mymp3file.mp3"))

 

[Johan Hormaza]

'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

 

[hatzisn]

'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

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.