IpAddress

1. IP Address Control  
 IPM_CLEARADDRESS  
 IPM_GETADDRESS  
 IPM_ISBLANK  
 IPM_SETADDRESS  
 IPM_SETFOCUS  
 IPM_SETRANGE  

2. IP Address Control Notifications  
 IPN_FIELDCHANGED  

 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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