Delphi之多线程实例

其他的我也就不多说了，说也说不好，再说这个东东因为暂时没有完全搞懂所以也不好说！之就给代码吧

program TestThread;

uses
  Forms,
  Main in 'Main.pas' {Form1},
  TstThrd in 'TstThrd.pas';

{$R *.res}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.

===============工程文件结束===============

unit Main;

interface

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

type
  TForm1 = class(TForm)
　  Button1: TButton;
　  Button2: TButton;
　  Image1: TImage;
　  Edit1: TEdit;
　  procedure Button1Click(Sender: TObject);
　  procedure Button2Click(Sender: TObject);
  private
　  { Private declarations }
  public
　  { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  newThread: TTstthread;
begin
  newThread := TTstThread.Create(False);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Image1.Picture.LoadFromFile(ExtractFilePath(Application.ExeName) + '0.bmp');
end;

end.

===================Main.Pas结束================

unit TstThrd;

interface

uses
  Classes;

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

implementation
uses SysUtils, Main;

{ 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 TTstThread.UpdateCaption;
　  begin
　　  Form1.Caption := 'Updated in a thread';
　  end; }

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

procedure TTstThread.Execute;
var
  i: integer;
begin
  { Place thread code here }
  FreeOnTerminate := true;
  for i := 0 to 2000000 do
  begin
　  if Terminated then break;
　  inc(Answer, Round(Abs(Sin(Sqrt(i)))));
　  Synchronize(GiveAnswer);
  end;
end;

end.

==================线程单元结束=====================

  代码很简单，只是一个计算，不过这个计算却比较费时间。多线程情况下，你可以操作按钮一来就算，同时也可以来操作按钮二来载入一幅图片，不会出现程序假死状态；但是单线程就容易假死，只有等待数据计算完毕才可以在如图片。单线程的代码我就不贴了，比较容易。