messagebox在最顶层写法

MessageBox(Application.Handle, 'text', 'caption', MB_TOPMOST + MB_ICONINFORMATION);)

或者

MessageBox(Self.Handle, 'text', 'caption', MB_TOPMOST + MB_ICONINFORMATION);)

或者

Application.MessageBox('text', 'caption', MB_TOPMOST + MB_ICONINFORMATION);)

 unit 打开文件目录;

interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs,ShellAPI, Vcl.StdCtrls;
type
TForm2 = class(TForm)
btn1: TButton;
btn2: TButton;
btn3: TButton;
btn4: TButton;
btn5: TButton;
btn6: TButton;
btn7: TButton;
btn8: TButton;
btn9: TButton;
btn10: TButton;
btn11: TButton;
btn12: TButton;
procedure btn1Click(Sender: TObject);
procedure btn2Click(Sender: TObject);
procedure btn3Click(Sender: TObject);
procedure btn4Click(Sender: TObject);
procedure btn5Click(Sender: TObject);
procedure btn6Click(Sender: TObject);
procedure btn7Click(Sender: TObject);
procedure btn8Click(Sender: TObject);
procedure btn9Click(Sender: TObject);
procedure btn10Click(Sender: TObject);
procedure btn11Click(Sender: TObject);
procedure btn12Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form2: TForm2;
implementation
{$R *.dfm}
procedure TForm2.btn4Click(Sender: TObject);
begin
messagebox(0,'没有选择播放类型','错误',MB_ICONINFORMATION+MB_OkCancel );
end;
procedure TForm2.btn5Click(Sender: TObject);
begin
Application.MessageBox('MessageBox','警告',MB_ICONWARNING+MB_YesNo);
end;
procedure TForm2.btn6Click(Sender: TObject);
var
a:string;
begin
MessageBox(Form2.Handle,'MessageBox','提示',MB_ICONINFORMATION+MB_OkCancel);
end;
procedure TForm2.btn7Click(Sender: TObject);
begin
MessageBox(Form2.Handle,'MessageBox','提示',MB_ICONINFORMATION+MB_OkCancel+MB_DEFBUTTON2+MB_APPLMODAL);
end;
end.