关闭按钮不起作用解决方法

关闭按钮不起作用Delphi(Pascal) codeunit Unit1interfaceusesWindows, Messages, SysUtils, Variants, C

关闭按钮不起作用

Delphi(Pascal) code

unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    Button2: TButton;    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);  private    { Private declarations }  public    { Public declarations }  end;var  Form1: TForm1;  Mark:Boolean=True;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);begin  while Mark do  begin    Application.ProcessMessages;  end;end;procedure TForm1.Button2Click(Sender: TObject);begin  Mark:=False;end;end.

开始运行后，点击button1后，在不点button2前，窗体不能正常关闭，但是最小最大化都可以，这是为什么呢？

[解决办法]
友情UP
[解决办法]

Delphi(Pascal) code

  while Mark and not Application.Terminated do    Application.ProcessMessages;
[解决办法]
點擊關閉按鈕，會產生WM_Close，而這個消息是非隊列消息；Application.ProcessMessages并不會處理到。
正是由于這段
procedure TForm1.Button1Click(Sender: TObject);
begin
 while Mark do
 begin
   Application.ProcessMessages;
 end;
end;
使得程序一直專注于處理隊列消息，沒有機會處理非隊列消息。
應該這么寫
Delphi(Pascal) code點擊關閉按鈕，會產生WM_Close，而這個消息是非隊列消息；Application.ProcessMessages并不會處理到。正是由于這段procedure TForm1.Button1Click(Sender: TObject);begin  while Mark do  begin    Application.HandleMessage;  end;end;
[解决办法]
  while Mark do
 begin
   Application.ProcessMessages;
 end;
这是个死循环呀
[解决办法]
或者Timer