Question

django 1.4. I am trying to develop a function to deploy download. I didnt get the right result. I attach my code at below. When I download after click hyperlink, I got a 0 bytes file. The Content-Length is 0 in debug mode. I have read many related questions, I got some clues, but still confused, since I got 0 bytes file after download. can anyone help modify codes below, thx for ur time.

   def download_file(request, filepath, filename):
        path_to_file = filepath+"\\"+filename
        serverfile = file(path_to_file, 'rb')
        response = HttpResponse(mimetype='application/force-download')
        response['Content-Disposition'] = 'attachment; filename=%s' % smart_str(filename)
        response['Content-Length'] = serverfile.tell()
    return response

Answer 1

.tell() gives the current position in a file. Since you haven’t read any of the file, your current position will be at position 0.

You could use os.stat(path_to_file).st_size to give the file size in bytes. Note that you should also use os.path.join(filepath, filename) to get the full (OS-independent) path to the file, rather than concatenating manually.