Retrieving Blob files

Question

I have a SQL Server 7 database where files are stored as blob.
Now I want to retrieve the files so i created a java program. I can retrieve the files, but when I open them (I saved them as txt) there unreadable.
Then I found that in the text the type of document is specified. So I did a renaming. after this I'm able to open PDF files but word or excell files are still unreadable.
does anybody have excperience with this?
This is het part of the code used to extract the files.
void getBinaryFileAttachment(String FileName,ResultSet rs) throws IOException, FileNotFoundException, SQLException
          //Array to hold array of file bytes
          byte[] fileBytes; //an array of bytes
          byte buf[] = rs.getBytes(1);
          System.out.println(buf);
          String ext = "";
          OutputStream targetFile;
          //Create and write the tempfile
          OutputStream tempFile=  new FileOutputStream("Temp.dat");
            tempFile.write(buf);
          tempFile.close();
          File f = new File("Temp.dat");               
          FileReader fr = new FileReader(f);
          BufferedReader br = new BufferedReader(fr);
          String meta = br.readLine();
          if(meta.indexOf(".pdf") != -1)
               System.out.println("PDF File detected");
               ext = ".pdf";
          else
          if(meta.indexOf("Word.Document.8") != -1)
               System.out.println("Doc File detected");
               ext = ".doc";
          else
               ext = ".txt";
          fileBytes = rs.getBytes(1); //create a byte array from contents of field
          targetFile =  new FileOutputStream(FileName+ext); // define the output stream 
          targetFile.write(buf); //write the array of bytes to file
          targetFile.close(); //close the File stream
     }

Answer 1

Documents saved through the OEL container type in Client Server are saved as serialised objects in the database - e.g. the thing the DB is not a binary copy of the document on disk, but a memory representation.
WebUtil on the other hand - saves any file to the DB as a binary copy of the O/S file and likewise any file it pulls out will be an exact copy of what is in the DB.
In the case of using WebUtil to pull out a document that was saved through an OLE container this will not work because the file on disk that WebUtil produces will not be the same as the source document.
At some point we'll be writing a utility to de-serialise the OLE document that is Stored by OLE containers in a blob to restore them to file form on disk.
You can of course do this manually by writing a Form (in 6i client server) which queries the blob into an OLE container and then uses OLE to call the Save method of the OLE server to pull the document onto disk.
HTH