How do I write to StdOut from a GUI app started from the command line?

Question

I am writing a standard windows app in Delphi 7.

If I was writing a console app, I can call the following to output to the cmd line or output file.

write         


        

Answer 1

I'm not quite sure what you are trying to achieve.
As I understood the question one way could be

program Project1;
{$APPTYPE CONSOLE}

uses
  Forms, Classes, Windows,
  Unit1 in 'Unit1.pas' { Form1 } ;
{$R *.res}

var
  Finished: Boolean;
  Input: String;

function IsConsoleMode(): Boolean;
var
  SI: TStartupInfo;
begin
  SI.cb := SizeOf(TStartupInfo);
  GetStartupInfo(SI);
  Result := ((SI.dwFlags and STARTF_USESHOWWINDOW) = 0);
end;

procedure HandleInput;
begin
  Finished := Input = 'quit';
  if not Finished then
  begin
    Writeln('Echo: ' + Input);
  end
  else
    Writeln('Bye');
end;

begin
  if IsConsoleMode then
  begin
    Finished := false;
    Writeln('Welcome to console mode');
    while not Finished do
    begin
      readln(Input);
      HandleInput;
    end;
  end
  else
  begin
    Writeln('Entering GUI Mode');
    FreeConsole;
    Application.Initialize;
    Application.MainFormOnTaskbar := True;
    Application.CreateForm(TForm1, Form1);
    Application.Run;
  end;

end.