class WinSimpleClass
{
public:
WinSimpleClass (char const * name, HINSTANCE hInst)
: _name (name), _hInstance (hInst)
{}
WinSimpleClass (int resId, HINSTANCE hInst);
char const * GetName () const { return _name.c_str (); }
HINSTANCE GetInstance () const { return _hInstance; }
 HWND GetRunningWindow ();
protected:
HINSTANCE_hInstance;
std::string_name;
};

WinSimpleClass::WinSimpleClass (int resId, HINSTANCE hInst)
: _hInstance (hInst)
{
ResString resStr (hInst, resId);
_name = resStr;
}

HWND WinSimpleClass::GetRunningWindow ()
{
 HWND hwnd = ::FindWindow (GetName (), 0);
 if (::IsWindow (hwnd))
 {
  HWND hwndPopup = ::GetLastActivePopup (hwnd);
  if (::IsWindow (hwndPopup))
   hwnd = hwndPopup;
 }
 else
  hwnd = 0;

 return hwnd;
}


--------------------------------------------------------------------------------

class WinClass: public WinSimpleClass
{
public:
 WinClass (char const * className, HINSTANCE hInst, WNDPROC wndProc);
 WinClass (int resId, HINSTANCE hInst, WNDPROC wndProc);
 void SetBgSysColor (int sysColor)
 {
  _class.hbrBackground = reinterpret_cast<HBRUSH> (sysColor + 1);
 }
 void SetResIcons (int resId);
 void Register ();
protected:
 void SetDefaults ();
 WNDCLASSEX _class;
};

WinClass::WinClass (char const * className, HINSTANCE hInst, WNDPROC wndProc)
 : WinSimpleClass (className, hInst)
{
 _class.lpfnWndProc = wndProc;
SetDefaults ();
}

WinClass::WinClass (int resId, HINSTANCE hInst, WNDPROC wndProc)
 : WinSimpleClass (resId, hInst)
{
 _class.lpfnWndProc = wndProc;
SetDefaults ();
}

void WinClass::SetDefaults ()
{
 // 提供合理的默认值
 _class.cbSize = sizeof (WNDCLASSEX);
 _class.style = 0;
 _class.lpszClassName = GetName ();
 _class.hInstance = GetInstance ();
 _class.hIcon = 0;
 _class.hIconSm = 0;
 _class.lpszMenuName = 0;
 _class.cbClsExtra = 0;
 _class.cbWndExtra = 0;
 _class.hbrBackground = reinterpret_cast<HBRUSH> (COLOR_WINDOW + 1);
 _class.hCursor = ::LoadCursor (0, IDC_ARROW);
}

void WinClass::SetResIcons (int resId)
{
 _class.hIcon = ::LoadIcon (_class.hInstance, MAKEINTRESOURCE (resId));
 // 可以使用LoadImage从同样的资源中装入小图标
 _class.hIconSm = reinterpret_cast<HICON> (
  ::LoadImage (
   _class.hInstance,
   MAKEINTRESOURCE (resId),
   IMAGE_ICON,
   ::GetSystemMetrics (SM_CXSMICON),
   ::GetSystemMetrics (SM_CYSMICON),
   LR_SHARED));
}

void WinClass::Register ()
{
 if (::RegisterClassEx (&_class) == 0)
  throw WinException ("Internal error: RegisterClassEx failed.");
}


--------------------------------------------------------------------------------

class TopWinClass: public WinClass
{
public:
 TopWinClass (int resId, HINSTANCE hInst, WNDPROC wndProc);
};

TopWinClass::TopWinClass (int resId,
   HINSTANCE hInst, WNDPROC wndProc)
 : WinClass (resId, hInst, wndProc)
{
 SetResIcons (resId);
 _class.lpszMenuName = MAKEINTRESOURCE (resId);
}
      


--------------------------------------------------------------------------------
一旦窗口类在系统被注册，你可以建立任意个你想要的这个类的窗口。他们将，当然，他们同享这个类注册的过程。稍后我们将可以了解在过程内窗口的不同实例的区别。
WinMaker类的工作非常像WinClass。它的构造函数提供了切合实际的默认值，可以通过调用细节方法去覆盖。一旦任何事都设置了，你调用Create方法去建立一个窗口，及调用Show方法去显示它。注意，在调用Create的瞬间，你的窗口过程被WM_CREATE消息调用。

顶层窗口使用TopWinMaker类建立，提供了适当的风格和标题。


--------------------------------------------------------------------------------

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