topic Re: How to set a string for a cell in array values of GDL object? in Archicad C++ API

How to set a string for a cell in array values of GDL object?

Tran Thanh Lo — Mon, 16 Sep 2024 12:27:42 GMT

I get and set a value in array values like this.

if ((*memo.params)[i].name == (GS::UniString)"matrix_area") { API_AddParType* pAddPar = &(*memo.params)[i]; GS::uchar_t** arrHdl = reinterpret_cast<GS::uchar_t**>(pAddPar->value.array); (*arrHdl)[0] = 'f'; }

But I can only set it to the uchar_t value. Can I set it a string value?
Can you answer for me? Thank you very much.

Re: How to set a string for a cell in array values of GDL object?

DGSketcher — Sat, 14 Oct 2023 16:55:37 GMT

In GDL land an array may only contain one data type e.g. number or string, they can't be mixed. Not sure if that is what you are trying to do?

Re: How to set a string for a cell in array values of GDL object?

Tran Thanh Lo — Sun, 15 Oct 2023 04:36:18 GMT

@DGSketcher wrote:
In GDL land an array may only contain one data type e.g. number or string, they can't be mixed. Not sure if that is what you are trying to do?

Yes, I see. Thank you very much.

Re: How to set a string for a cell in array values of GDL object?

BerndSchwarzenbacher — Sun, 15 Oct 2023 22:21:15 GMT

You need to use something like GS::ucscpy to copy a whole string (instead of a single character) into a uchar_t pointer. And the handle needs to be appropriately sized!

Here's some (untested) sample code:

GS::Array<GS::UniString> stringsToCopy{ "foo", "barbar" }; // assuming we have a one dimensional parameter array of strings auto& currentParam = (*memo.params)[i]; if (currentParam.dim1 != 1) { return; } currentParam.dim1 = usedZoneCats.GetSize (); currentParam.dim2 = 1; GS::USize totalLength = 0; for (const auto str : stringsToCopy) { // +1 because the "\0" string delimiter is not counted in GetLength () function totalLength += str.GetLength () + 1; } currentParam.value.array = BMReallocHandle (currentParam.value.array, totalLength * sizeof (GS::uchar_t), REALLOC_FULLCLEAR, 0); auto attrArray = reinterpret_cast<GS::uchar_t*>(*currentParam.value.array); GS::USize strStart = 0; for (Int32 j = 0; j < currentParam.dim1; ++j) { GS::ucscpy (attrArray + strStart, stringsToCopy[j].ToUStr ()); strStart += stringsToCopy[j].GetLength () + 1; }