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Frequently Asked Questions

Clearing the window in a console application

Question:

How can I guarantee to clear my window in a console application?

Answer:

The following example demonstrates clearing the console window by
using the screensize information passed back from the Windows API
function GetConsoleScreenBufferInfo() to write several blank lines.

Example:

program Project1;

{$APPTYPE CONSOLE}

uses
  Windows;

{$R *.RES}

var
  sbi : TConsoleScreenBufferInfo;
  i : integer;
begin
  Writeln('A Console Applicaiton');
  Writeln('Press Enter To Clear The Screen');
  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE),
                             sbi);
  Readln;
  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE),
                             sbi);
  for i := 0 to sbi.dwSize.y do
    writeln;
  Writeln('Press Enter To End');
  Readln;
end.

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