AnimationCtrl

1. Animation Control Messages  
 ACM_OPEN  
 ACM_PLAY  
 ACM_STOP  


2. Animation Control Notifications  
 ACN_START  
 ACN_STOP  

 父窗口通过WM_COMMAND消息接收:

 wNotifyCode = HIWORD(wParam); // notification code
 wID = LOWORD(wParam);         // item, control, or accelerator identifier
 hwndCtl = (HWND) lParam;      // handle of control

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