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From: fmattison@ssd5.nrl.navy.mil (Frank Mattison)
Newsgroups: comp.lang.ada
Subject: Read Binary File
Date: 3 Nov 2003 07:56:33 -0800
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Date: 2003-11-03T07:56:33-08:00
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Does anyone have a suggestion for reading this binary file?  

Situation: OpenVMS, Alpha, Ada '83.  Binary file created by C++ program.
           Use_Error raised on first byte.  We regularly read Ada-generated
           binary files, but the C++ source in new.    
  
with Sequential_IO;
with Text_IO;
procedure Test_Sio is
   type Byte is range 0..255;
   for Byte'Size use 8;
   package Byte_IO is new Sequential_IO(Byte);
   Test_Byte : Byte;
   File : Byte_IO.File_Type;
begin
   Byte_Io.Open (File => File, Mode => Byte_Io.In_File, Name => "TEST.BIN");
   Trap:
   begin
      Byte_IO.Read(File => File, Item => Test_Byte);
      exception
         when Byte_IO.Use_Error =>
            Text_IO.Put_Line("Use Error raised on Byte_IO.Read");
            Byte_Io.Close (File => File);
   end Trap;
   exception
   when others =>
      Text_IO.Put_Line("Other exception raised");
      Byte_Io.Close (File => File);
end Test_Sio;

Result:
>run test_sio
Use Error raised on Byte_IO.Read

>dump/byte/page test.bin
 00 00 07 D3 34 35 35 37 00 00 05 C8 00 D2 00 01 ..�.�...7554�... 000000
 3E 08 BD B3 53 AE C1 56 00 00 CA D8 00 00 00 F7 �...��..V��S��.> 000010
 A4 13 65 CF FD C1 41 7A 12 7E C8 E7 A4 6D C1 36 6�m���~.zA���e.� 000020
                                                      
Have tried essentially all variations on the file attributes and formats  
beginning with these, which work for files created by Ada:  

Record format:      Variable length, maximum 0 bytes, longest 1480 bytes
Record attributes:  Carriage return carriage control
RMS attributes:     None

Record format:      Stream_LF, maximum 0 bytes, longest 32767 bytes
Record attributes:  Carriage return carriage control
RMS attributes:     None

Thanks for any suggestion!

Frank Mattison