MessageDlg用法

unit Unit1;

interface

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

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
Label1: TLabel;
Label2: TLabel;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
Button1.Caption := 'mtWarning';
Label2.Caption  := 'mbOkCancel';

if Word(mrCancel) = MessageDlg('Warning', mtWarning, mbOKCancel, 0) then
Label1.Caption := 'mrCancel'
else
Label1.Caption :=  'mrOK';
end;

procedure TForm1.Button2Click(Sender: TObject);
var
wValue: Word;
begin
Label2.Caption := 'mbYesNoCancel';
wValue := MessageDlg('Error', mtError, mbYesNoCancel, 0);

case wValue of
mrYes:    Label1.Caption := 'mrYes';
mrNo:     Label1.Caption := 'mrNo';
mrCancel: Label1.Caption := 'mrCancel';
end;

Button2.Caption := 'mtError';
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
Label2.Caption  := 'mbYesNoAllCancel';
case MessageDlg('Information', mtInformation, mbYesAllNoAllCancel, 0) of
mrYes:      Label1.Caption := 'mrYes';
mrYesToAll: Label1.Caption := 'mrYesToAll';
mrNo:       Label1.Caption := 'mrNo';
mrNoToAll:  Label1.Caption := 'mrNoToAll';
mrCancel:   Label1.Caption := 'mrCancel';
end;

Button3.Caption := 'Information';
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
Label2.Caption := 'mbAbortRetryIgnore';
case MessageDlg('Confirmation', mtConfirmation, mbAbortRetryIgnore, 0) of
mrAbort:  Label1.Caption := 'mrAbort';
mrRetry:  Label1.Caption := 'mrRetry';
mrIgnore: Label1.Caption := 'mrIgnore';
end;
Button4.Caption := 'Confirmation';
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
Label2.Caption := 'mbAbortIgnore';
case MessageDlg('Custom', mtCustom, mbAbortIgnore, 0) of
mrAbort:  Label1.Caption := 'mrAbort';
mrIgnore: Label1.Caption := 'mrIgnore';
end;
Button5.Caption := 'Custom';
end;

end.