重载 CreateParams 方法[1]: 从一个例子开始(取消窗口最大化、最小化按钮的三种方法)

方法1: 使用 TForm 的 BorderIcons 属性

---

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  BorderIcons := BorderIcons - [biMinimize, biMaximize];
end;
 
end.

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方法2: 使用 SetWindowLong 函数

---

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.FormCreate(Sender: TObject);
var
  ws: Integer;
begin
  ws := GetWindowLong(Handle, GWL_STYLE);
  ws := ws xor WS_MINIMIZEBOX xor WS_MAXIMIZEBOX;
  SetWindowLong(Handle, GWL_STYLE, ws);
end;
 
end.

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方法3: 重载 CreateParams 方法

---

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;
 
type
  TForm1 = class(TForm)
    procedure CreateParams(var Params: TCreateParams); override;
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.CreateParams(var Params: TCreateParams);
begin
  inherited; //inherited CreateParams(Params);
  Params.Style := Params.Style xor WS_MINIMIZEBOX xor WS_MAXIMIZEBOX;
end;
 
end.

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