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ReadChar  
Method  
Reads the next character from the current stream
BinaryReader Class
System.IO NameSpace
CF1.  Function ReadChar : Byte;
CF : Methods with this mark are Compact Framework Compatible
Description
If the current stream has not been exhausted, the next character is returned, otherwise -1 is returned.
 
The stream position is updated accordingly.
Microsoft MSDN Links
System.IO
System.IO.BinaryReader
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Reading a single character at a time
program Project1;
{$APPTYPE CONSOLE}

uses
  System.IO;

var
  MyFileStream  : System.IO.FileStream;
  MyFileWriter  : System.IO.BinaryWriter;
  MyFileReader  : System.IO.BinaryReader;

begin
  // Create and open our binary file as a stream
  MyFileStream := System.IO.File.Open('C:DelphiBasics.txt',
                                      System.IO.FileMode.Create);

  // Create a BinaryWriter to allow writing to this file
  MyFileWriter := System.IO.BinaryWriter.Create(MyFileStream);

  // Write to the file
  MyFileWriter.Write('A');
  MyFileWriter.Write('B');
  MyFileWriter.Write('C');

  // Close the writer and the stream
  MyFileWriter.Close;
  MyFileStream.Close;

  // Reopen the stream for reading
  MyFileStream := System.IO.File.Open('C:DelphiBasics.txt',
                                      System.IO.FileMode.Open);

  // Create a BinaryReader to allow the file to be read back
  MyFileReader := System.IO.BinaryReader.Create(MyFileStream);

  // Display the file contents
  while MyFileReader.PeekChar <> -1 do
    Console.WriteLine(Char(MyFileReader.ReadChar));

  // Close the reader and the stream
  MyFileReader.Close;
  MyFileStream.Close;

  Console.Readline;
end.
   A
   B
   C
 
 
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