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

[Tran Thanh Lo]

Spoiler

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.

[DGSketcher · Accepted solution]

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?

[Tran Thanh Lo]

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@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?

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Yes, I see. Thank you very much.

[BerndSchwarzenbacher]

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;
}