How to select elements of a particular ElementID or Classification

dushyant — Tue, 14 Sep 2021 06:28:44 GMT

Hi,

ACAPI_Element_GetElemList() allows selection of all elements of a particular type.

How do we select elements of a particular ElementID or Classification?

Thanks.

Re: How to select elements of a particular ElementID or Classification

BerndSchwarzenbacher — Sat, 11 Sep 2021 11:55:46 GMT

Hi dushyant,

Element ID Property
You mean the Element ID property right? Unfortunately in that case, I don't think there's a single command to do that. My approach would be to make a candidate list of element GUIDs and then filter the matching ones yourself by accessing the property value similar to this:

API_Property prop; ACAPI_Element_GetPropertyValue (elemGuid, elemIdGuid, prop); auto value = prop.value.singleVariant.variant.uniStringValue;

where "elemGuid" is the GUID of the current element to test and "elemIdGuid" is the GUID of the "Element ID" property itself. I think that property GUID never changes and even is the same for different AC installs, but I'm not 100% sure. That's why I wrote myself the following function which you are free to copy:

GSErrCode GetElemIdPropertyGuid (API_Guid& elemIdGuid) { GSErrCode err = NoError; // This is our initial guess. elemIdGuid = GSGuid2APIGuid (GS::Guid ("B1B54D45-C951-42C9-9AF8-898F0BF212AB")); API_PropertyDefinition elemIdPropDef; elemIdPropDef.guid = elemIdGuid; err = ACAPI_Property_GetPropertyDefinition (elemIdPropDef); if (err != NoError) { return err; } // We check if it gives us the correct property. if (elemIdPropDef.name == "Element ID") { return NoError; } // Otherwise we have to search for it GS::Array<API_PropertyGroup> groups; err = ACAPI_Property_GetPropertyGroups (groups); if (err != NoError) { return err; } for (GS::USize i = 0; i < groups.GetSize(); ++i) { if (groups[i].name == "ID and Categories") { GS::Array<API_PropertyDefinition> definitions; err = ACAPI_Property_GetPropertyDefinitions (groups[i].guid, definitions); if (err != NoError) { return err; } for (GS::USize j = 0; j < definitions.GetSize (); ++j) { if (definitions[j].name == "Element ID") { elemIdGuid = definitions[j].guid; return NoError; } } } } return APIERR_GENERAL; }

Classification

I didn't manipulate classifications yet with the AC API so I can only give rough guesses from what I gathered from the documentation. It seems like the function ACAPI_Element_GetElementsWithClassification might do exactly what you want. Again there's the problem of figuring out what the GUID of the classification item is. My first idea was to use ACAPI_Classification_GetClassificationSystem then ACAPI_Classification_GetClassificationSystemRootItems and recursively iterate on the child items ACAPI_Classification_GetClassificationItemChildren until you get the desired classification item. In case you find an easier way let us know 🙂

Re: How to select elements of a particular ElementID or Classification

dushyant — Sun, 12 Sep 2021 12:39:00 GMT

Hi Bernd,

Yes, I had been following the method of getting a set of elements and filter them based on the criteria. I was only curious if I there was any single command available to select elements using a classification-item ID or element ID, like ACAPI_Element_GetElemList() which takes an element-typeID (API_ElemTypeID) as the filter.

So looks like there isn't any.

Thanks for sharing that info!!

topic How to select elements of a particular ElementID or Classification in Archicad C++ API

How to select elements of a particular ElementID or Classification

Re: How to select elements of a particular ElementID or Classification

Re: How to select elements of a particular ElementID or Classification