Flat file producing weird characters in a flat file

Question

I am extracting BLOB Data into a file .Its producing wierd characters in a file.Any help would be appreciated.The code is as follows.
create or replace PROCEDURE A(product_id in varchar) IS
vblob BLOB;
vstart NUMBER := 1;
bytelen NUMBER := 32000;
len NUMBER;
my_vr RAW(32000);
x NUMBER;
l_output sys.UTL_FILE.FILE_TYPE;
BEGIN
-- define output directory
l_output := sys.utl_file.fopen('A', 'getPayload8.txt','wb',32760);
vstart := 1;
bytelen := 32000;
-- get length of blob
SELECT dbms_lob.getlength(BIN) INTO len FROM orabpel.xml_document products WHERE dockey = product_id;
-- save blob length
x := len;
-- select blob into variable
SELECT BIN
INTO vblob
FROM orabpel.xml_document
WHERE dockey = product_id;
-- if small enough for a single write
IF len < 32760 THEN
utl_file.put_raw(l_output,vblob);
utl_file.fflush(l_output);
ELSE -- write in pieces
vstart := 1;
WHILE vstart < len and bytelen > 0
LOOP
dbms_lob.read(vblob,bytelen,vstart,my_vr);
utl_file.put_raw(l_output,my_vr);
utl_file.fflush(l_output);
-- set the start position for the next cut
vstart := vstart + bytelen;
-- set the end position if less than 32000 bytes
x := x - bytelen;
IF x < 32000 THEN
bytelen := x;
END IF;
utl_file.fclose(l_output);
end loop;
END IF;
end;

Answer 1

Surely CLOB data would be what is expected to be written to a text file whereas a BLOB is more likely to be a binary format file of some sort like a JPEG or word .DOC file.It's not actually agree with that suppose. The BLOB objects are used in text file as well as CLOBs in case we need to unload exactly matched structure. What do i mean?! For example, we use CLOB to unload text data into file. In this case the text file itself depends on platform (i.e. byte order, line termination characters).In case of BLOB everything goes exactly as is.