WinAPI: GetClassName - 获取指定窗口的类名  //声明:  GetClassName(    hWnd: HWND;         {指定窗口句柄}    lpClassName: PChar; {缓冲区}    nMaxCount: Integer  {缓冲区大小}  ): Integer;           {返回类名大小; 失败返回 0}  --------------------------------------------------------------------------------    //测试1: 新建一个工程, 主窗口的类名默认是 TForm1, 用程序获取一下看看  var    ps: array[0..254] of Char;  begin    GetClassName(Handle, ps, 255);    ShowMessage(ps); {TForm1}  end;  --------------------------------------------------------------------------------    //测试2: 看看 "计算器" 窗口的类名(先启动计算器)  var    h: HWND;    ps: array[0..254] of Char;  begin    h := FindWindow(nil, ‘计算器‘); {这句是获取计算器窗口的句柄}    GetClassName(h, ps, 255);    ShowMessage(ps); {SciCalc}  end;  --------------------------------------------------------------------------------    //测试3: 看看记事本窗口的类名(先重新启动记事本):  var    h: HWND;    ps: array[0..254] of Char;  begin    h := FindWindow(nil, ‘无标题 - 记事本‘); {这句是获取记事本窗口的句柄}    GetClassName(h, ps, 255);    ShowMessage(ps); {Notepad}  end;