終止TTask.Run啟動的線程

unit Unit15;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants,
  System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, System.Threading,
  kbmmwprocess, Vcl.StdCtrls, kbmMWClientDataset;

type
  TForm15 = class(TForm)
    Button1: TButton;
    kbmMWClientTransactionResolver1: TkbmMWClientTransactionResolver;
    Button2: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    FTaskIsRunning: boolean;
    cnt: Integer;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form15: TForm15;

implementation

{$R *.dfm}

procedure TForm15.Button1Click(Sender: TObject);
begin
  FTaskIsRunning := true;
  TTask.Run(
    procedure
    begin
      while FTaskIsRunning do
      begin
        sleep(99);
        TThread.Synchronize(nil,
          procedure
          begin
            Label1.Caption := 'Thread is running...' + cnt.ToString;
            inc(cnt);
          end);
      end;//end while.
    end);

end;

procedure TForm15.Button2Click(Sender: TObject);
begin
  FTaskIsRunning := false;
  cnt := 0;
end;

procedure TForm15.FormCreate(Sender: TObject);
begin
  FTaskIsRunning := false;
  cnt := 0;
end;

end.

上面的代碼，運行正常，按Button1開啟一個線程，Button2終止線程運行。這是一個VCL項目。可以看到用一個私有變量FTaskIsRunning來控件線程中的循環。這個實現是在一個Form中，運行正常，現在換成TFrame中實現，基本上是復制Form中的實現代碼，可以忽略不看。

unit Unit16;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes,
  Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls,System.Threading;

type
  TFrame16 = class(TFrame)
    Label1: TLabel;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    FTaskIsRunning:boolean;
    cnt:Integer;
  public
    { Public declarations }
  end;

implementation

{$R *.dfm}

procedure TFrame16.Button1Click(Sender: TObject);
begin
  FTaskIsRunning := true;
  TTask.Run(
    procedure
    begin
      while FTaskIsRunning do
      begin
        sleep(99);
        TThread.Synchronize(nil,
          procedure
          begin
            Label1.Caption := 'Thread is running...' + cnt.ToString;
            inc(cnt);
          end);

      end;
    end);
end;

procedure TFrame16.Button2Click(Sender: TObject);
begin
  FTaskIsRunning := false;
  cnt := 0;
end;

end.

然后，把Frame放到Form上運行，結果也正常。

將上面的Frame+Form的實現方式，換成FMX項目，在Android,Win32平台運行，也正常。