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ReadSingle  
Method  
Reads the next 16 bytes from the current stream as a Single number
BinaryReader Class
System.IO NameSpace
NotCF1.  Function ReadSingle ( ) : Decimal;
CF : Methods with this mark are Compact Framework Compatible
Description
If the current stream has enough bytes remaining, the next 4 bytes are returned as a Single number.
 
The stream position is updated accordingly.
Microsoft MSDN Links
System.IO
System.IO.BinaryReader
 
 
A simple example
program Project1;
{$APPTYPE CONSOLE}

uses
  System.IO;

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

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
  MySingle := 123.456;
  MyFileWriter.Write(MySingle);
  MySingle := 9.87654321;
  MyFileWriter.Write(MySingle);

  // 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);

  // Try to read Single values from the file
  try
    while 1 = 1 do
    begin
      MySingle := MyFileReader.ReadSingle;
      Console.WriteLine(MySingle.ToString);
    end;
  except
    On E : Exception do
      Console.WriteLine('End of file');
  end;

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

  Console.Readline;
end.
Show full unit code
  123.456
  9.87654321
  End of file
 
 
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