The framework's hook function calls this member function to filter and respond to certain Windows messages.
virtual BOOL ProcessMessageFilter(
Specifies a hook code. This member function uses the code to determine how to process lpMsg.
A pointer to a Windows MSG structure.
Nonzero if the message is processed; otherwise 0.
A hook function processes events before they are sent to the application's normal message processing.
If you override this advanced feature, be sure to call the base-class version to maintain the framework's hook processing.