Realtime Input? Thread?

[C.Schoch]

You have to add a Thread-Objekt to your programm and fill it with code

edit:
or view my test programm

[Olli]

Zitat:

Zitat von C.Schoch

@Olli the mainform is a thread too, and bacause of this you can use the wait function too.

Also IsWindow() gibt aber TRUE zurück. Ist wohl doch ein Fenster und kein Thread? Ist mir schon klar, daß das Hauptform im Hauptthread "lebt" und die Nachrichten über diesen Thread bekommt, aber was willst du mir damit sagen?

Zitat:

Zitat von C.Schoch

Here i work with events and thay you can set from everywhere in the programm.

Jupp.

@sk.Silvia: The TThread class must not be used like this. It has to be derived and the derived class has to be instantiated (and obviously implemented).

[sk.Silvia]

but how? :oops:

Delphi-Quellcode:

type TFiber=class(TTHread)
  procedure execute; override;
  end;

  procedure TFiber.execute;
  var i:integer;
      begin
      repeat
        ShowMessage(IntToStr(i));
        Suspend;
        i:=i+1;
      until i=3;
      end;

var Fiber:TFiber;

procedure TForm1.Button1Click(Sender: TObject);
var i:integer;
  begin
  Fiber:=TFiber.Create(false);
  Fiber.execute;
  end;

procedure TForm1.Button2Click(Sender: TObject);
  begin
  Fiber.Resume;
  end;

but thats not correct:(

[DGL-luke]

I still don't know why you want to do this with a thread, if you mind looking at my post above.

But if, this is how to do it:

- place the query (or whatever fetches the input form the user) in a thread
- after the query was answered and confirmed by the user, the thread sets a variable "I'm done", places the user input somewhere the main thread has access to and goes asleep/terminates

- in your main thread, you use waitforsingleobject to wait until the thread does set this variable, fetch the input and continue your loop.

But unless you have to keep your app doing something else while waiting for the input (which wouldn't work the way I just described it), i don't know why you would want to use a thread here...

EDIT: you don't initialize your "i" in the thread, so it'll probably take a long time until it gets to "3". but I can't see any othermistakes in it.

[sk.Silvia]

cause i dont want that other forms are opened, i want just to stop the process, work with some other procedures and then by cliking resume work with the stoped procedure again


but this codes dont stopes on Suspend, but counts directly up to 3

Delphi-Quellcode:

type TFiber=class(TTHread)
  Memo:TMemo;
    procedure execute; override;
    procedure doit;
    constructor Create(iMemo:TMemo);
  end;

  constructor TFiber.Create(iMemo:TMemo);
    begin
    inherited Create(false);
    Memo:=iMemo;
    end;

  procedure TFiber.execute;
  var i:integer;
      begin
      Synchronize(Doit);
      doit;
      end;

  procedure TFiber.doit;
  var i:integer;
      begin
      i:=0;
      repeat
        Memo.Lines.Append(IntToStr(i));
        Suspend;
        i:=i+1;
      until i=3;
      end;

var Fiber:TFiber;

procedure TForm1.Button1Click(Sender: TObject);
var i:integer;
  begin
  Fiber:=TFiber.Create(Memo1);
  Fiber.execute;
  end;

procedure TForm1.Button2Click(Sender: TObject);
  begin
  Fiber.Resume;
  end;

[C.Schoch]

IMHO you have to use suspend in the main thread

[DGL-luke]

ah... think i got you.

You have to place the thing you want to be able to suspend in the second thread.

well, your first example does work fine with me:

Delphi-Quellcode:

unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm2 = class(TForm)
    {...}
  end;

  TFiber=class(TTHread)
    procedure execute; override;
  end;


var
  Form2: TForm2;
  Fiber: TFiber;

implementation

procedure TFiber.execute;
var i:integer;
begin
  i := 0;
  repeat
    ShowMessage(IntToStr(i));
    Suspend;
    i:=i+1;
  until i=3;
end;

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
begin
  Fiber.Resume;
end;

procedure TForm2.FormShow(Sender: TObject);
begin
  Fiber := TFiber.Create(false);
end;

end.

@C.Schoch: Yes, if you want to stop the thread like when the user says so or similarly.

[sk.Silvia]

but by me the Suspend; dont stop the threat, it do nothing(likle i could exclude Suspend from the code and it would be the same) :(

but i need to suspend the threat in the repeat, so i cannot suspend it in Form1

Delphi-Quellcode:

  procedure TFiber.execute;
  var i:integer;
      begin
      i:=0;
      repeat
        Memo.Lines.Append(IntToStr(i));
        Suspend; //<------------HERE
        i:=i+1;
      until i=3;
      end;

[DGL-luke]

it DOES with me...

I attached some primitive prime test, which stops itself after every found prime.

[C.Schoch]

maybe try :

Delphi-Quellcode:

   procedure TFiber.execute;
  var i:integer;
      begin
      i:=0;
      repeat
        Memo.Lines.Append(IntToStr(i));
        wait(1) // <--- Here i changed
        Suspend; //<------------HERE
        i:=i+1;
      until i=3;
      end;

i have no Delphi here to test this now