Receiving HTML Help Notification Messages in an MFC Application

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To receive notification messages from HTML Help within an MFC program, you must:

1. Define a symbol in your Visual C++ project. This example uses a symbol called ID_HHNOTIFICATION.
   • To define a symbol, right click the high-level folder in ResourceView and select Resource Symbols.
     
     
   • In the Resource Symbols dialog box, click New and define the new symbol.
2. In your Visual C++ project, initialize the HH_WINTYPE structure and call the HTMLHelp function to set this structure using the HH_SET_WIN_TYPE command. Use ID_HHNOTIFICATION for the idNotify field in the structure.
   
   
3. Define the handler for your custom notification message.
   • Place a function prototype for the handler, called OnNavComplete, in your class' .h file. For example:

     protected:
     //{{AFX_MSG(CMainFrame)
     afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
     //}}AFX_MSG
     void OnNavComplete(NMHDR*, LRESULT*);
     DECLARE_MESSAGE_MAP()
     

   • Place an entry in your class's message map as follows:

     BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
     //{{AFX_MSG_MAP(CMainFrame)
     ON_WM_CREATE()
     ON_NOTIFY(HHN_NAVCOMPLETE, ID_HHNOTIFICATION, OnNavComplete)
     //}}AFX_MSG_MAP
     END_MESSAGE_MAP()
     

   • Define a function, OnNavComplete, to handle the notifications.

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