globalmapper.SetMessageCallbackEx
=================================

.. currentmodule:: globalmapper
.. py:function:: SetMessageCallbackEx (GM_MessageCallbackFunc aCallbackFunc, bool aThreadLocal, int aReserved) -> None

    Sets the function to call to display error and warning messages generated during SDK operations. If a message
    callback is provided, a message dialog will not be shown, instead the callback function will be called with the
    error or warning message that would have been displayed.

    :param GM_MessageCallbackFunc aCallbackFunc: The callback function to use to display error and warning messages
    :param bool aThreadLocal: should this callback only be used within the current thread?
    :param int aReserved: Reserved for future use; must be 0.
    :returns: Nothing is returned
    :rtype: None