topic Re: How can I get area and volume of element components in Archicad C++ API

How can I get area and volume of element components

kolioi — Mon, 19 May 2025 08:50:41 GMT

I have a generic wall with default parameters. When I open the All Components Schedule there is a list of all components of this wall. How can I get the area and the volume as displayed in the screenshot? Didn't find any sample code in the examples.

Re: How can I get parameters of components

BerndSchwarzenbacher — Fri, 16 May 2025 14:37:22 GMT

Hi Kolioi,

I think you can get these values via ACAPI_Element_GetQuantities.

The composites member of the API_Quantities object should have exactly those values you are looking for.

Hope that helps,

Bernd

Re: How can I get parameters of components

kolioi — Mon, 19 May 2025 10:13:58 GMT

Hi Bernd,

This works for elements but not for their components.

In the above example I have a composite wall with 2 skins

Here is my code

GS::Array<API_Guid> elemList; GS::GSErrCode err = ACAPI_Element_GetElemList(API_WallID, &elemList, APIFilt_In3D); for (USize i = 0; i < elemList.GetSize(); i++) { API_Element element{}; element.header.guid = elemList.Get(i); err = ACAPI_Element_Get(&element); if (!err) { GS::Array<API_ElemComponentID> elemComponents; err = ACAPI_Element_GetComponents(element.header.guid, elemComponents); for (const auto& comp : elemComponents) { API_QuantityPar params; API_Quantities quantities; API_QuantitiesMask mask; API_ElementQuantity quantity{}; quantities.elements = &quantity; ACAPI_ELEMENT_QUANTITY_MASK_SETFULL(mask); ACAPI_ELEMENT_COMPOSITES_QUANTITY_MASK_SETFULL(mask); err = ACAPI_Element_GetQuantities(comp.componentID.componentGuid, &params, &quantities, &mask); ACAPI_ELEMENT_QUANTITIES_MASK_CLEAR(mask); ACAPI_ELEMENT_COMPOSITES_QUANTITY_MASK_CLEAR(mask); } } }

and ACAPI_Element_GetQuantities() returns APIERR_BADID (Incorrect elemGuid was specified / The passed identifier is not a valid one, or valid, but not proper for the given operation). If I pass the wall guid, the function returns correct values for the wall. However, I want to obtain the area and volume of the wall skins.

Re: How can I get area and volume of element components

BerndSchwarzenbacher — Mon, 19 May 2025 10:14:39 GMT

I was thinking about getting the quantities for the element wall and then checking quantities->composites.

Did you try this too?

Re: How can I get area and volume of element components

kolioi — Mon, 19 May 2025 10:15:50 GMT

It's NULL

Re: How can I get area and volume of element components

BerndSchwarzenbacher — Mon, 19 May 2025 10:04:44 GMT

Hm... you probably need to allocate the composites member first, like you did for the elements member.

API_Quantities quantities; API_ElementQuantity quantity{}; quantities.elements = &quantity; GS::Array<API_CompositeQuantity> compositeQuantities{}; quantities.composites = &compositeQuantities;

Re: How can I get area and volume of element components

kolioi — Mon, 19 May 2025 10:38:48 GMT

OK, I found it in the examples.

Element_Test, Element_Snippets.cpp, Do_CalcQuantities()