I need the console window to stay open

[357mag 2]

What are some of the ways I can code my console program to keep the console window open after it opens? I know in C++ I used to use getch().

[programmerdelphi2k 237]

"ReadLN"  dont?

 

or https://stackoverflow.com/questions/2591774/how-to-create-a-console-application-that-does-not-terminate

Edited May 3, 2023 by programmerdelphi2k

[357mag 2]

Yes I was about to post that I found a way using ReadLine.

 

I'm a little confused about the two end keywords. It seems sometimes I see end with a semicolon and that is all. Other times I see end with a period. Other times I see both in a code snippet. 

[DelphiUdIT 176]

And something like this ?

 

program Test;

{$APPTYPE CONSOLE}

{$R *.res}

Uses System.SysUtils, WinApi.Windows;

var Termina: boolean = false;

function handle_ctrl_c(fdwCtrlType: UINT64): WORDBOOL;
begin
	//If it returns TRUE then the chain of managers is not continued.
	//If I return FALSE then the next handler in the chain is also called.
    case fdwCtrlType of
      // Handle the CTRL-C signal.
      CTRL_C_EVENT:
        begin
          Termina := True;
          Beep(750, 300);
          writeln('Ctrl-C event');
          result := TRUE;
        end;
        // CTRL-CLOSE: confirm that the user wants to exit.
      CTRL_CLOSE_EVENT:
        begin
          Termina := True;
          Beep(600, 200);
          writeln('Ctrl-Close event');
          result := TRUE;    //The program will' close ...
        end;
        // Pass other signals to the next handler.
      CTRL_BREAK_EVENT:
        begin
          Termina := True;
          Beep(900, 200);
          writeln('Ctrl-Break event');
          result := TRUE;
        end;
      CTRL_LOGOFF_EVENT:
        begin
          Termina := True;
          Beep(1000, 200);
          writeln('Ctrl-Logoff event');
          result := FALSE;
        end;
      CTRL_SHUTDOWN_EVENT:
        begin
          Termina := True;
          Beep(750, 500);
          writeln('Ctrl-Shutdown event');
          result := FALSE;
        end;
      else
        result := FALSE;
    end;
end;

//Main
begin
  //Implements ctrl-... handler
  SetConsoleCtrlHandler(@handle_ctrl_c, TRUE);
  Writeln(DateTimeToStr(now)+' - Is running - press CTRL-C to terminate or the key "F2"');
  while (not Termina) do
    begin
      try
        sleep(10);
        //This is another way to catch a key
		    //Pressing F2 key will exit
        if (GetKeyState(VK_F2) and $8000) <> 0 then
          begin
            Termina := true;  //This is not necessary since there is a break condition
            break;
          end;

         //put here your code

      except on E: Exception do
        Writeln(E.ClassName, ': ', E.Message);
      end;
    end;
end.

 

Edited May 3, 2023 by DelphiUdIT

[357mag 2]

So when your program is all completed as far as writing all the code, you put an end (with a period) at the end. If you are just denoting a code block, then you put and end (with a semicolon).

[DelphiUdIT 176]

31 minutes ago, 357mag said:

So when your program is all completed as far as writing all the code, you put an end (with a period) at the end. If you are just denoting a code block, then you put and end (with a semicolon).

Now is OK, with proper heading and better indentation.

 

You must terminate with a "end." (end with a period)

 

The last begin is closed in this way in an "app console" (if you look a dpr file of a vcl application, you will see the same ... begin .... end.)

Edited May 3, 2023 by DelphiUdIT

[Remy Lebeau 1396]

On 5/3/2023 at 11:28 AM, 357mag said:

I'm a little confused about the two end keywords. It seems sometimes I see end with a semicolon and that is all. Other times I see end with a period. Other times I see both in a code snippet. 

'end;' terminates compound statements, case statements, scope blocks, class/record declarations, etc. See Declarations and Statements (Delphi)

 

'end.' terminates only a unit block. See Programs and Units (Delphi)

 

You should read the Delphi Language Guide for all the syntax rules.

Edited May 4, 2023 by Remy Lebeau