topic Re: Change the default value of a parameter in a LibPart in Archicad C++ API

Change the default value of a parameter in a LibPart

tsuyoshimishina — Tue, 17 Sep 2024 09:05:39 GMT

Hello experts,
I am a newbie and am here trying to get some information about changing the default value of a parameter in a LibPart. By reading this topic, I have managed to call APIAny_OpenParametersID, APIAny_GetActParametersID, and APIAny_ChangeAParameterID on the parameter with NoError. But the parameter value does not change. Do I need to call some extra function after APIAny_ChangeAParameterID in order to "overwrite" the library part with the new default parameter value?

Re: Change the default value of a parameter in a LibPart

Ralph Wessel — Wed, 01 May 2024 15:22:08 GMT

Is the library part stored in a writable state? If not, e.g. embedded in an LCF, you won't be able to write changes to it

Re: Change the default value of a parameter in a LibPart

tsuyoshimishina — Thu, 02 May 2024 01:23:44 GMT

I'm not sure if it's in a writable state. The library part is in the embedded library folder. Do I need to call ACAPI_Environment(APIEnv_OverwriteLibPartID) or some function to make it writable?

Re: Change the default value of a parameter in a LibPart

Ralph Wessel — Thu, 02 May 2024 19:39:01 GMT

If it's in the embedded library, you should be able to echo the example code for ACAPI_LibraryPart_OpenParameters here: https://graphisoft.github.io/archicad-api-devkit/group___library_part.html

Re: Change the default value of a parameter in a LibPart

tsuyoshimishina — Fri, 03 May 2024 11:06:48 GMT

Ralph,

Thank you for pointing me to an example.
Below is what I'm actually doing in my add-on to change the value of the "c4dPhoIESFile" parameter of a library part (lamp):

BNZeroMemory(&libPart, sizeof(API_LibPart)); // I have both parentUniID and ownUniID values of the library part in std::string variables strcpy(libPart.ownUnID, ownUniID.c_str()); strcpy(libPart.parentUnID, parentUniID.c_str()); auto err = ACAPI_LibPart_Search(&libPart, false); if (err != NoError) ACAPI_WriteReport(L("Failed to search the library part"), true); API_GetParamsType theParams{ }; API_ParamOwnerType paramOwner{ }; paramOwner.typeID = API_ObjectID; // may have to be API_LampID? paramOwner.libInd = libPart.index; GSErrCode err = ACAPI_Goodies(APIAny_OpenParametersID, &paramOwner); err |= ACAPI_Goodies(APIAny_GetActParametersID, &theParams); if (err == NoError) { API_ChangeParamType changeParam{ }; CHTruncate("c4dPhoIESFile", changeParam.name, API_NameLen); GS::UniString uniStrName("test.ies"); GS::uchar_t uniStrBuffer[_MAX_FNAME]{ 0 }; GS::ucsncpy(uniStrBuffer, uniStrName.ToUStr().Get(), _MAX_FNAME); changeParam.uStrValue = uniStrBuffer; err = ACAPI_Goodies(APIAny_ChangeAParameterID, &changeParam); if (err != NoError) ACAPI_WriteReport(L("[LampImportTest, ERROR] Failed to update the c4dPhoIESFile parameter"), true); } else ACAPI_WriteReport(L("[LampImportTest, ERROR] Failed to get the c4dPhoIESFile parameter"), true); ACAPI_DisposeAddParHdl(&theParams.params); ACAPI_Goodies(APIAny_CloseParametersID);

This runs without any errors but the parameter value doesn't change.

I checked the parameter on GDL Object Editor, and noticed that its type is not a simple string but a list of selectable strings (which is called a "value list" in ARCHICAD terminology?)

"test.ies" is certainly in the list, but it doesn't seem to be able to select it by simply setting a value to the parameter. Can you suggest me how to deal with this type of parameter using the API?