Delphi程序API申明调用及参数传址与传值

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    btn1: TButton;
    procedure apitest(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
function MB(hWnd: Integer; lpText, lpCaption: string; uType: Integer): Integer;
stdcall; external 'user32.dll' name 'MessageBoxA';

function FW(ClassName, WindowName: string ): Integer;
stdcall; external 'user32.dll' name 'FindWindowA';

function getthpid(jubing:Integer;var lpid: Integer ): Integer;
stdcall; external 'user32.dll' name 'GetWindowThreadProcessId';
{$R *.dfm}

procedure TForm1.apitest(Sender: TObject);
var i,pid:Integer;
begin
    MB(0,'HellO WorlD','Shellcode的博客',0);
    i:=FW('扫雷','扫雷');
    getthpid(i,pid);
    ShowMessage(IntToStr(pid));
    GetWindowThreadProcessId(i,@pid);
    ShowMessage(IntToStr(pid));
end;

end.