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.