WinAPI 字符及字符串函数(11): lstrcpyn 复制字符串, 同时指定要复制的长度

unit Unit1;

interface

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

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

var
  Form1: TForm1;

implementation

{$R *.dfm}

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

  lstrcpyn(buf, p, 3+1); 
  ShowMessage(buf); {Del}

  lstrcpyn(buf, p, -1);
  ShowMessage(buf); {Delphi}
end;

end.