unit Unit1;

interface

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

type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var ddphwnd:hwnd ;
begin
ddphwnd:=findwindow(nil,'标题');
//获取窗口句柄
sendmessage(ddphwnd,messages.WM_LBUTTONDOWN,0,$0183017F); //单击
sendmessage(ddphwnd,messages.WM_LBUTTONUP,0,$0183017F); //弹起

end;

end.