本文整理自网络，侵删。
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button2Click(Sender: TObject);
private
private
procedure WMsyscommand(var msg : Twmsyscommand);message wm_syscommand;
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure Tform1.WMsyscommand(var msg : Twmsyscommand);
begin
if msg.CmdType = SC_MAXIMIZE then
showmessage('现在最大化')
else if msg.CmdType = SC_MINIMIZE then
showmessage('现在最小化');
inherited;
end;
end.
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