topic Re: Unable to change parameter "B" in Archicad C++ API

Unable to change parameter "B"

Anonymous — Thu, 13 Jul 2023 14:19:25 GMT

CHCopyC ("B",chgParam.name); 
			 chgParam.realValue = Value; 
			 err = ACAPI_Goodies (APIAny_ChangeAParameterID, &chgParam, NULL);

I change parameter "B" value and after using function:

err = ACAPI_LibPart_GetParams (LibIndex, &aa, &bb, &addParNum, &getParams.params) ;

"B" value turns back to "default" as it was before. How could i fix this so calling "B" (with ACAPI_LibPart_GetParams) returns changed value ?
Other parameters works fine have just problem with "A" and "B" after using ACAPI_LibPart_GetParams.

Re: Unable to change parameter "B"

Anonymous — Tue, 16 Jun 2015 10:03:44 GMT

ACAPI_ELEMENT_MASK_SET (mask, API_ObjectType, yRatio); 
	memo.params = getParams.params;

Maybe there is an issue with mask? By using mask differently could i get changed "B" after using ACAPI_LibPart_GetParams ?

Re: Unable to change parameter "B"

Anonymous — Wed, 17 Jun 2015 05:59:29 GMT

Now i ran parameter change function again after ACAPI_LibPart_GetParams, it seams that parameter have changed, but when creating object it creates object without changed "B" parameter although API shows "B" is changed value.

I'm surely missing something. Parameter update or something..

Re: Unable to change parameter "B"

Anonymous — Wed, 17 Jun 2015 08:46:09 GMT

Soooo...
I didn't solve my issue, but!
By using elem.object.xRatio = valueX;
elem.object.yRatio = valueY;
I did find workaround to get desired A and B positions. No idea why i couldn't change A and B.

Re: Unable to change parameter "B"

Ralph Wessel — Wed, 17 Jun 2015 09:30:26 GMT

Rinovo wrote:
Soooo...
I didn't solve my issue, but!
By using elem.object.xRatio = valueX;
elem.object.yRatio = valueY;
I did find workaround to get desired A and B positions. No idea why i couldn't change A and B.

The axial geometry of library parts is a bit messy in the API. If we're setting trying to set the axial width (for example) we set both the 'B' parameter and the xRatio field, but it's the latter that matters. Also take note of the useXYFixSize field – when false, the width is calculated as xRatio multiplied by the default library part 'B' parameter value.

Re: Unable to change parameter "B"

Anonymous — Wed, 17 Jun 2015 10:39:01 GMT

Thanks Ralph, for pointing out useXYFixSize.

Now i see why xRatio didn't multiply, i was already wondering why didn't it multiply.
My first though was to use xRatio multiplier to calculate desired 'B' width. Turned out i can just set xRatio as desired width value.