globalmapper.SetLayerUserData
=============================

.. currentmodule:: globalmapper
.. py:function:: SetLayerUserData (GM_LayerHandle_t32 aLayer, int aUserData) -> GM_Error_t32

    Sets the user data to associate with the layer. This value can be retrieved by calling
    :doc:`GetLayerInfo<../load/globalmapper.GetLayerInfo>`. This is useful if you want to tie some structure or value
    to a particular layer without maintaining your own separate layer to value mapping.

    :param GM_LayerHandle_t32 aLayer: layer to set user data for
    :param int aUserData: User data pointer/value to associate with layer
    :returns: Error Code
    :rtype: GM_Error_t32