Printing to prn:, to a matrix printer don't work sometimes

Question

If I do for example under windows:
FileOutputStream os = new FileOutputStream ("PRN:Okidata");
in order to print directly to a matrix point printer called exactly "Okidata" in the pc, I have seen that sometimes doesn't work (more or less 30% of the pc I have tried) FileNotFound appears, but the printer name is well written.
Why this happen? it has something to do with windows? the matter is that not always I can access the printers with prn.
Something similar happens with \\pcname\printername. Here an error is not shown but the printer job stay in the p�rinter queue forever and doesn't print.
Many Thanks for any help. I really want to know what professional programs, printing to a matrix pont printer do, because using the windows drivers and java.awt.Graphics don't work nice in all cases. It even doesn't work with all models for example panasonic kx-p2130 the printing gets weird.
Thanks.

Answer 1

hi friend:
I need print *.prn files, i try use FileOutputStream write into prn on windows.
but i found it not work. the error message is:Device is not connected .
but i check my printer is ok.Can you help me? or give me a demo.
                FileOutputStream output=new FileOutputStream("prn:",true);          
                // the file c:\\my.prn length is 237010 bytes,so i sent separately to simulate  the data I have received
          int i[]=new int[]{65536 ,65536 ,65536 ,36864 ,3538};
          FileInputStream input=new FileInputStream( "c:\\my.prn");
          int j=0;
          while(j<i.length){
               int len=i[j];
               byte b[]=new byte[len];     
               input.read(b, 0, len);
               System.out.println("&#21097;&#20313;&#23383;&#33410;"+input.available());
               output.write(b);
               j++;
          }Thanks.