thrdu.pas

一个关于delphi线程的范例,举例简单的线程使用例子.

unit ThrdU;

interface

uses
  Classes;

type
  TTestThread = class(TThread)
  private
    Answer:Integer;
    { Private declarations }
  protected
    procedure GiveAnswer;
    procedure Execute; override;
  end;

implementation

uses SysUtils,Unit1;

{ Important: Methods and properties of objects in visual components can only be
  used in a method called using Synchronize, for example,

      Synchronize(UpdateCaption);

  and UpdateCaption could look like,

    procedure TTestThread.UpdateCaption;
    begin
      Form1.Caption := 'Updated in a thread';
    end; }

{ TTestThread }
procedure TTestThread.GiveAnswer;
begin
  Form1.Edit1.Text:=IntToStr(Answer);
end;

procedure TTestThread.Execute;
var
  i:Integer;
begin
  FreeOnTerminate:=True;
  Form1.ProgressBar1.Max:=200000;
  Form1.ProgressBar1.Position:=0;

  for i:=1 to 200000 do
  begin
    if terminated then Break;
    //Inc(Answer,Round(Abs(Sin(Sqrt(i)))));
    Answer:=i;
    Synchronize(GiveAnswer);
    Form1.ProgressBar1.Position:=Form1.ProgressBar1.Position+1;


  end;

end;

end.