Delphi Call WINAPI Character and string function (in): Lstrlen

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.