Wpg_docload from inside apex

Question

- I would like to use the below procedure to download an image in a new browser window.
- I created a public dad
- I created the following package/procedure:
create or replace package body jmf as
procedure download
is
v_bfile bfile;
begin
select bfilename('MY_FILES', 'jmf.pdf')
into v_bfile
from dual;
owa_util.mime_header('application/pdf', false);
owa_util.http_header_close;
wpg_docload.download_file(v_bfile);
end download;
end jmf;
- I am able to call this procedure from the url and it downloads the PDF
- I want to call this procedure from a APEX before header process. When I do I get the follwing error:
Apex error returned:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Apache Error_log :
(note: pyro is the dad apex is using)
error: mod_plsql: /pyro/f http-500 ora22285: non-existent directory or file for GETLENGTH operation\n
alert: unable to reset state for mode 0: Err 22285 url=>/pyro/F
Any Ideas would be greatly appreciated.
Thanks
Jon

Answer 1

Jon,
Take a look at the function download_file, which should install as part of the Sample Application. You can use something like that to download a file via an APEX process.
Here's a copy of that function, or at lease one that's similar:
create or replace procedure download_file
  (p_ticket_file_id in number)
as
  l_mime_type                varchar2(255);
  l_length                     number;
  l_content_file_name      varchar2(2000);
  l_content_file           blob;
begin
select
  mime_type,
  content_file,
  file_name,
  dbms_lob.getlength(content_file)
into
  l_mime_type,
  l_content_file,
  l_content_file_name,
  l_length
from
  ticket_files
where
  ticket_file_id = p_ticket_file_id;
owa_util.mime_header(nvl(l_mime_type,'application/octet'), FALSE );
htp.p('Content-length: ' || l_length);
htp.p('Content-Disposition: filename="' || l_content_file_name || '"');
owa_util.http_header_close;
wpg_docload.download_file(l_content_file);
end download_file;
/