| Description |
If the current stream has not been exhausted, the next byte is returned as a Boolean. Booleans always take up 1 byte. A value of 0 means false, other values are treated as true.
The stream position is updated accordingly.
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| Microsoft MSDN Links |
System.IO
System.IO.BinaryReader
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| Reading a single byte 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(false);
MyFileWriter.Write(true);
MyFileWriter.Write(0); // False
MyFileWriter.Write(1); // True
MyFileWriter.Write(123); // True
// 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);
// Read all stream bytes as Booleans
try
// Infinite loop : we end via the EndOfStreamException
while 1 = 1 do
if MyFileReader.ReadBoolean
then Console.WriteLine('True')
else Console.WriteLine('False');
except
On E : Exception do
Console.WriteLine('All done');
end;
// Close the reader and the stream
MyFileReader.Close;
MyFileStream.Close;
Console.Readline;
end.
| | Show full unit code | False
True
False
True
True
All done
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