字符串的长度计算

界面设计如下：

Memo1 一个  Label1 一个 Edit1 一个  Button1 两个

 1 unit Unit1;
 2
 3 interface
 4
 5 uses
 6   Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
 7   Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
 8
 9 type
10   TForm1 = class(TForm)
11     Button1: TButton;
12     Label1: TLabel;
13     Label2: TLabel;
14     Edit2: TEdit;
15     Button2: TButton;
16     Memo1: TMemo;
17     procedure Button2Click(Sender: TObject);
18     procedure Button1Click(Sender: TObject);
19   private
20     { Private declarations }
21   public
22     { Public declarations }
23   end;
24
25 var
26   Form1: TForm1;
27
28 implementation
29
30 {$R *.dfm}                //窗口、控件的位置、初始属性等内容是存放在*.DFM文件里面的，必须使用这个语句。
31
32 procedure TForm1.Button1Click(Sender: TObject);
33 var
34   stringlength:Integer;                           //定义整形变量，记录字符个数
35 begin
36   stringlength := Memo1.GetTextLen;               //把memo1里面输入的字符个数赋值给变量
37   Edit2.Text := IntToStr( stringlength);          //显示在Edit2里面
38 end;
39
40 procedure TForm1.Button2Click(Sender: TObject);
41 begin
42   close;                                          //退出
43 end;
44
45 end.