WinAPI 字符及字符串函数(12): lstrlen 串长度

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  p: PChar;
  buf: array[0..255] of Char;
  n1,n2: Integer;
begin
  p := 'Delphi';
  buf := 'Delphi';

  n1 := lstrlen(p);
  n2 := lstrlen(buf);

  ShowMessageFmt('%d,%d', [n1,n2]); {6,6}
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  n1,n2: Integer;
begin
  n1 := lstrlenA('万一的 Delphi 博客');
  n2 := lstrlenW('万一的 Delphi 博客');

  ShowMessageFmt('%d,%d', [n1,n2]); {18,13}
end;

end.