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    TDosStream.Seek

    Set file position.

    Declaration

    Source position: objects.pp line 366

    procedure TDosStream.Seek(Pos: LongInt);  virtual;

    Description

    If the stream's status is stOK, then Seek sets the file position to Pos. Pos is a zero-based offset, counted from the beginning of the file.

    Errors

    In case an error occurs, the stream's status is set to stSeekError, and the OS error code is stored in ErrorInfo.

    See also

    Name Description
    TStream.Seek Set stream position.
    TStream.GetPos Return current position in the stream.

    Example

    Program ex17;

{ Program to demonstrate the TStream.Seek method }

Uses Objects;

Var L : String;
    Marker : Word;
    P : PString;
    S : PDosStream;

begin
  L:='Some constant string';
  { Buffer size of 100 }
  S:=New(PDosStream,Init('test.dat',stcreate));
  Writeln ('Writing "',L,'" to stream.');
  S^.WriteStr(@L);
  Marker:=S^.GetPos;
  Writeln ('Set marker at ',Marker);
  L:='Some other constant String';
  Writeln ('Writing "',L,'" to stream.');
  S^.WriteStr(@L);
  S^.Close;
  S^.Open (stOpenRead);
  Writeln ('Size of stream is : ',S^.GetSize);
  Writeln ('Seeking to marker');
  S^.Seek(Marker);
  P:=S^.ReadStr;
  L:=P^;
  DisposeStr(P);
  Writeln ('Read "',L,'" from stream.');
  S^.Close;
  Dispose (S,Done);
end.