convert any value to string while reading data from excel x++

str COMVariant2Str(COMVariant _cv, int _decimals = 0, int _characters = 0, int _separator1 = 0, int _separator2 = 0)
{
switch (_cv.variantType())
{
case (COMVariantType::VT_BSTR):
return _cv.bStr();

case (COMVariantType::VT_R4):
return num2str(_cv.float(),_characters,_decimals,_separator1,_separator2);

case (COMVariantType::VT_R8):
return num2str(_cv.double(),_characters,_decimals,_separator1,_separator2);

case (COMVariantType::VT_DECIMAL):
return num2str(_cv.decimal(),_characters,_decimals,_separator1,_separator2);

case (COMVariantType::VT_DATE):
return date2str(_cv.date(),123,2,1,2,1,4);

case (COMVariantType::VT_EMPTY):
return “”;

default:
throw error(strfmt(“@SYS26908”, _cv.variantType()));
}
return “”;
}