changing the index of library part does not work

[Martin Walter]

I'm trying to change the library part index of an element by this code:

API_Element elementMask;
BNZeroMemory(&elementMask, sizeof(API_Element));

ACAPI_ELEMENT_MASK_SET(elementMask, API_WindowType, openingBase.libInd);
element.window.openingBase.libInd = iLibIndex;

const GSErrCode error = ACAPI_Element_ChangeParameters({ element.header.guid }, &element, nullptr, &elementMask);

const GSErrCode errorChange = ACAPI_Element_Change(&element, &elementMask, nullptr, 0UL, false);

But I get the result APIERR_BADPARS for both functions ACAPI_Element_ChangeParameters and ACAPI_Element_Change.

[Ralph Wessel]

Are you attempting to change the element within an active undo session? Otherwise, what error is returned?

[Martin Walter]

Yes I use the command in ACAPI_CallUndoableCommand.

The returned error is APIERR_BADPARS.

[Martin Walter]

Any ideas?

[Ralph Wessel · Accepted solution]

I think that changing just the index of the library part may not be sufficient. You probably also need to set the correct parameters for that object – possibly that's what the error is indicating.

You could get the correct parameters by loading the default from the object with ACAPI_LibPart_GetParams. The memo data retrieved with this method can be directly used to update the target element, but you might want to use ACAPI_Element_Change in order to write the changes to both the element and memo data.

[Martin Walter]

Using the element memo instead of a nullptr was the correct hint. Thanks a lot!