topic Re: How to Create Layer ArchiCAD27/C++ in Archicad C++ API

How to Create Layer ArchiCAD27/C++

nishida_jp — Thu, 13 Mar 2025 11:51:04 GMT

I'm programing on ArchiCAD27/VisualStudio C++2019/Windows10.
But my function can not create layer

GSErrCode CreateLayer(GS::UniString layer_name, API_Attribute* attr) { BNZeroMemory(attr, sizeof(API_Attribute)); attr->header.typeID = API_LayerID; attr->header.uniStringNamePtr = &layer_name; GS::UniString title = u8"Create Layer"; GSErrCode res = ACAPI_Attribute_Create(attr, nullptr); //1) if (res == APIERR_NEEDSUNDOSCOPE) { res = ACAPI_CallUndoableCommand(title, [&]()->GSErrCode { return(ACAPI_Attribute_Create(attr, nullptr)); }); } return(res); }

1) res == -213031231 meaning
APIERR_NOTSUPPORTED

why i cannot create layer ?

Re: How to Create Layer ArchiCAD27/C++

Danny Sparks-Cousins — Fri, 14 Mar 2025 00:06:59 GMT

Hi,

Are you using a demo version or full version of ArchiCAD? Can you show us how you are calling your function? I was able to call your function successfully and create a layer using;

GS::ErrCode err = NoError; API_Attribute myAttribute = {}; err = CreateLayer("A TEST LAYER", &myAttribute); ACAPI_WriteReport("CreateLayer returned error [%ld]", false, err);

Also, creating an attribute / layer is non-undoable, so doesn't need the undo fallback code.

Hope this helps.

Danny

Re: How to Create Layer ArchiCAD27/C++

nishida_jp — Fri, 14 Mar 2025 05:32:48 GMT

Thank you.
I success [CreateLayer]

My ArchiCAD is not DEMO version.

I think on our result.
My Error Reason is that [Create Layer] is on Constructor in Global Variables.

CreateLayer() move to oter function from Constructor.

===== Addon.cpp
class MainData {
public:
MainData() {
...
CreateLayer(...);
...
}
};

MainData mMaindata;
----Addon's Functions
....
================
Error
Start ArchiCAD27 execute constructor of mMainData before [New Project] or [Load Project].
-->constructor of mMainData
-> CreateLayer() Error
->after [New Project] or [Load Project].
-->on Select Addon Menu
-->call CreateLayer() on button
-> CreateLayer() Error

//----Success Pattern

class MainData {
public:
MainData() {
...
// CreateLayer(...);
...
}
void Go() {
CreateLayer(...);
}
};
MainData mMaindata;

And
On Addon - Menu Click
mMainData.go();