typedef void (*tvMessageHandler) (void *, tvMessageType which, char const *fmt, va_list args)

Callback function to receive warning or error messages from a rendering thread

Parameters:

closure - opaque pointer passed in.
which - classification of message. Values may be:

TV_ERROR_MSG
TV_STATUS_MSG
TV_BUSY_MSG

fmt - message text (???)
args - ????

See Also:

tvSetMessageHandler, tvMessageType