MaxLogicFoundation/MaxLogic.CLIUtils.pas at main · MaxLogic/MaxLogicFoundation · GitHub

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Unit MaxLogic.CLIUtils;

interface

uses
  winapi.windows, system.sysUtils;

procedure  ClearScreen;

(*
  #13 is a carriage return, which moves the cursor back to the
  left side of the console without adding a line feed (#10). It
  allows writing on the same line over the same content without
  moving to the next line.
*)


implementation


procedure  ClearScreen;
var
  stdout: THandle;
  csbi: TConsoleScreenBufferInfo;
  ConsoleSize: DWORD;
  NumWritten: DWORD;
  Origin: TCoord;
begin
  stdout := GetStdHandle(STD_OUTPUT_HANDLE);
  Win32Check(stdout<>INVALID_HANDLE_VALUE);
  Win32Check(GetConsoleScreenBufferInfo(stdout, csbi));
  ConsoleSize := csbi.dwSize.X * csbi.dwSize.Y;
  Origin.X := 0;
  Origin.Y := 0;
  Win32Check(FillConsoleOutputCharacter(stdout, ' ', ConsoleSize, Origin,
    NumWritten));
  Win32Check(FillConsoleOutputAttribute(stdout, csbi.wAttributes, ConsoleSize, Origin,
    NumWritten));
  Win32Check(SetConsoleCursorPosition(stdout, Origin));
end;

end.