| Description |
A buffered stream supports direct access to sections of the stream. You might, for example, want to treat the stream as a set of records, and then Seek to a certain record in order to update the values.
You can seek to a specified byte Offset from one of the following Origin values :
| SeekOrigin.Begin | Byte 0 of the stream |
| SeekOrigin.Current | The current stream position |
| SeekOrigin.End | After the final byte of the stream |
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| | References | SeekOrigin
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| Microsoft MSDN Links |
System.IO
System.IO.FileStream
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| A simple example |
program Project1;
{$APPTYPE CONSOLE}
uses
System.IO;
var
Stream : System.IO.FileStream;
ByteAsInteger : Integer;
begin
// Open the file for writing
Stream := System.IO.FileStream.Create('C:\DelphiBasics.txt',
FileMode.Create);
// Write to the file
Stream.WriteByte(65); // Chr(65) = 'A'
Stream.WriteByte(66); // Chr(66) = 'B'
Stream.WriteByte(67); // Chr(67) = 'C'
// Move to the start of the file
Stream.Seek(0, SeekOrigin.Begin);
// Display the contents
ByteAsInteger := Stream.ReadByte;
while ByteAsInteger >= 0 do
begin
Console.Write(Char(ByteAsInteger));
ByteAsInteger := Stream.ReadByte;
end;
// Close the stream
Stream.Close;
Console.Readline;
end.
| | Show full unit code | ABC
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