Global Mapper SDK

GM_SetLayerUserData

Sets the user data to associate with the layer. This value can be retrieved by calling GM_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.

Syntax

C++

Copy

GM_DLL_EXPORTED GM_Error_t32 __stdcall GM_SetLayerUserData
(
GM_LayerHandle_t32  aLayer,         // layer to set user data for
void*               aUserData       // user data pointer/value to associate with layer
)