计算字符的长度

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    procedure Edit1Change(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  close;                                              //关闭窗口
end;

procedure TForm1.Edit1Change(Sender: TObject);        //编辑框1中的内容改变时的事件
var
  stringlength: integer;                              //记录编辑框1中的字符个数
begin
  stringlength := edit1.GetTextLen;                   //获取编辑框1中的字符个数
  edit2.Text := inttostr(stringlength);               //编辑框2显示编辑框1中的字符个数
end;

end.

 

把编辑框2的属性修改为只读

Edit2's Readonly is true