GM_SetChildLayerOpCallback |
Sets the function to call to report the load or close of a child layer. This happens during draw or export of a map catalog or online layer. The layer handle provided via the callback can then be used in other function calls that take a layer handle so you can do things like customize vector styles. You can get the parent layer handle by calling GM_GetLayerInfo.
SyntaxGM_DLL_EXPORTED void __stdcall GM_SetChildLayerOpCallback ( GM_ChildLayerOpCallbackFunc aCallbackFunc, void* aUserData // IN: User data that will be passed back to callback function );
RemarksThe callback function itself should match the following declaration:
typedef void (__stdcall *GM_ChildLayerOpCallbackFunc)
(
GM_LayerHandle_t32 aChildLayer, // IN: Handle to new loaded layer
GM_ChildLayerOp_t8 aChildLayerOp, // IN: The operation (i.e. load or close) that just happened
GM_LayerHandle_t32 aParentLayer, // IN: Handle to new loaded layer's parent
void* aUserData, // IN: User data original provided in call to set this callback
void* aReserved // IN: Reserved for future use
);