delphi 编程入门二 GetTextLen函数

GetTextLen函数是Object Pascal语言中众多函数的一种，是一段代码，在被调用时能实现计算Edit控件中的字符串长度这一功能。

 

unit Unit1;

interface

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

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

var                     //定义变量
  Form1: TForm1;
  s:string[11];         // S为字符串型数据
  stringlength:byte;    //stringlength为BYTE型数据
implementation

{$R *.dfm}

procedure TForm1.Edit1Change(Sender: TObject);//双击Form窗体后生成
begin                                         //开始
stringlength:=edit1.GetTextLen;               //将Edit1中的值赋给变量stringlength
str(stringlength,s);                          //将stringlength转换成str型数据并赋值给S
edit2.Text:=s;                                 //将变量S赋值给Edit2
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
close;
end;

end.

 

 

 

例程下载（源码+编译）https://files.cnblogs.com/hzh7557153/字符长度.rar