| Description |
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The PeekChar method returns the next stream character as an integer. The stream position is unaffected. The value returned is -1 if the stream is exhausted.
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| | Notes | Be wary of stream byte values of 255.
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| Microsoft MSDN Links |
System.IO
System.IO.BinaryReader
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| Stopping reading when a certain value is encountered |
program Project1;
{$APPTYPE CONSOLE}
uses
System.IO;
var
MyFileStream : System.IO.FileStream;
MyFileWriter : System.IO.BinaryWriter;
MyFileReader : System.IO.BinaryReader;
CharAsInteger : Integer;
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('ABC');
MyFileWriter.Write(123);
MyFileWriter.Write('DEF');
// 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 until a value of 123 is read
// Only the 'ABC' string length and decimal values of A,B,C
// are read.
while MyFileReader.PeekChar <> 123 do
Console.WriteLine(MyFileReader.ReadByte.ToString);
// Close the reader and the stream
MyFileReader.Close;
MyFileStream.Close;
Console.Readline;
end.
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