getSize method
Implementation
Point<double>? getSize() {
Point<double>? result;
var wPointer = calloc<Int32>();
var hPointer = calloc<Int32>();
if (query(nullptr, nullptr, wPointer, hPointer) == 0) {
result = Point(wPointer.value.toDouble(), hPointer.value.toDouble());
}
calloc.free(wPointer);
calloc.free(hPointer);
return result;
}