Save User Data in Library Part

[Martin Walter]

What can I do to save binary user data with ~100KB in a Library Part?

[Ralph Wessel]

Is the data for use only by the add-on? Or does the library part need to share it?

If the former, use ACAPI_Element_SetUserData.

Otherwise (if the object needs to 'see' the data) you probably need to write the data to object parameters.

[Martin Walter]

I'm creating a library part with some user data in the parameter section and putting it as element into a wall.

Later the user selects an element and the addon should get the library part from it and read the user data from the parameter section.

The first part seems to be working using ACAPI_LibPart_GetSect_ParamDef.

But how do I get the library part from a selected element?

[Ralph Wessel · Accepted solution]

Is the library part a door/window or an ordinary object?

If it's a door/window, the wall contains links to the embedded objects in its memo structure. You can obtain this with ACAPI_Element_GetMemo.

If it's an ordinary object, you will need to establish a link between the wall and object using ACAPI_Element_Link. You can later retrieve linked objects from the wall using ACAPI_Element_GetLinks.

[Martin Walter]

It's a window or door. So what memo mask should I use for ACAPI_Element_GetMemo?

[Ralph Wessel]

APIMemoMask_WallWindows for windows
APIMemoMask_WallDoors for doors

[Martin Walter]

When the element was created I filled the memo with ACAPI_Element_GetDefaults(&element, &memo);

But calling ACAPI_Element_GetMemo now, the wallWindows pointer in API_ElementMemo is empty.

[Ralph Wessel]

Are there any windows placed in the wall?

[Martin Walter]

Yes, I use a selected window, that is placed in the wall and would like to get the corresponding library part and then the user data.

[Martin Walter]

In the API file APIdefs_Elements.h
where the API_ElementMemo structure is defined there is the line:

API_Guid *wallWindows; // output only (obsolete, use ACAPI_Element_GetConnectedElements instead)

so maybe this part should not be used any more?