Error Loading External Library - worked on 10g, now upgraded to 11g and not

Question

I have an external C library that have been using for years to extracy binary data (images, docs, pdfs etc) from a blob column in a table
This has been working on Oracle 10.2.0.1 on Windows 32 bit for years.
I have a new server, Windows 2008 64 bit, have installed 11.2.0.1, created a database and done a full datapump export and import.
My application seems to work fine with the exception of this external dll
I have made sure the dll is in the correct directory on the server and the library is pointing to it :
create or replace library EXTERNPROCEDURES as 'C:\oracle\extern\extern.dll';I then have the same wrapper code that works fine on 10g, is there something I need to do on 11g to "authorise" the external dll or anything as I know the security is tighter or is there an issue with the fact this is 64bit Oracle?
I have set the listener.ora to be the same as on 10g
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = DB12)(PORT = 1521))
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ENVS = "EXTPROC_DLLS=ANY")
      (ORACLE_HOME = c:\oracle\ora11g)
      (PROGRAM = extproc)
    (SID_DESC =
      (GLOBAL_DBNAME = UPAD)
      (ORACLE_HOME = c:\oracle\ora11g)
      (SID_NAME = UPAD)
  )And the TNS names file
EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
  )Wrapper:
create or replace procedure OutputString(
  p_Path in varchar2,
  p_Message in varchar2,
  p_mode in varchar2,
  p_NumLines in binary_integer)
as
external
  library externProcedures
  name "OutputString"
  with context
  parameters (context,
              p_Path string,
              p_path INDICATOR,
              p_Message string,
              p_message INDICATOR,
              p_mode string,
              p_mode INDICATOR,
              p_NumLines int,
              p_numlines INDICATOR)
;And the actual pl/sql code
create or replace procedure extract_b
(pname in varchar2
,ppath in varchar2
is
     vBlob          blob;
     vLen          number;
     vRaw          raw(10000);
     i          number;
     j          number := 10000;
begin
     select blob_content into vBlob from wwv_document$ where name = pName;
     -- find the length of the blob column
     vLen :=  DBMS_LOB.GETLENGTH(vBlob);
     -- Read 10000 bytes at a time
     i := 1;
     if vLen < 10000 then
     -- If the col length is < 10000
          DBMS_LOB.READ(vBlob,vLen,i,vRaw);
          outputstring(pPath,rawtohex(vRaw),'wb',2*vLen);
     -- You have to convert the data to rawtohex format. Directly sending the buffer data will not work
     -- That is the reason why we are sending the length as the double the size of the data read
     else
     -- If the col length is > 10000
          DBMS_LOB.READ(vBlob,j,i,vRaw);
          outputstring(pPath,rawtohex(vRaw),'wb',2*j);
     end if;
     i := i + 10000;
     while (i < vLen ) loop
     -- loop till entire data is fetched
          DBMS_LOB.READ(vBlob,j,i,vRaw);
          outputstring(pPath,rawtohex(vRaw),'ab',2*j);
          i := i + 10000 ;
     end loop;
end;Any ideas?
Thanks
Robert

Answer 1

I call extract_b from sqlplus, which calls outputstring which fails with the error message posted
Not really sure what else I can provide as I've posted the code for outputstring
The problem is the for some reason Oracle cannot load the dll, I think the code is fine as it has run on 10g, I think the issue is maybe along the lines that there is something extra in 11g I need to do to set the external library up or it's not happy with the fact it's 64bit or the listener.ora needs to be different in 11g or something like that but I am at a loss as where to look