mainunit.pas

《Delphi 7经典问题解析》源代码 第一到七章 基础篇源程序 应用篇源程序

unit mainunit;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Edit1: TEdit;
    Label1: TLabel;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
 Showmessage('主窗体的句柄是：'+IntToStr(Form1.Handle));
end;

procedure TForm1.FormShow(Sender: TObject);
begin
 Button1.SetFocus;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
 Showmessage('当前鼠标点击的按钮的句柄是：'+IntToStr(Button2.Handle));
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
 if (Application.MessageBox('是否决定改变主窗体的标题','询问',MB_OKCANCEL + MB_OK)=ID_OK) then
   begin
    SetWindowText(Form1.Handle, Pchar(Edit1.Text));
    if (Edit1.Text='')then
     ShowMessage('用户将主窗体的标题设置为空!')
    else
     ShowMessage('用户将主窗体的新标题设置为：'+Edit1.Text);
    Button3.SetFocus; 
   end
   else
   begin
    ShowMessage('用户取消了修改主窗体标题的操作!');
    Button3.SetFocus;
   end;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
 Close;
end;

end.