getNamedValueOrDefault method

JsonValue? getNamedValueOrDefault(
  1. String name,
  2. JsonValue? defaultValue
)

Implementation

JsonValue? getNamedValueOrDefault(String name, JsonValue? defaultValue) {
  final retValuePtr = calloc<COMObject>();
  final nameHstring = convertToHString(name);

  final hr = ptr.ref.vtable
          .elementAt(6)
          .cast<
              Pointer<
                  NativeFunction<
                      HRESULT Function(
                          Pointer,
                          IntPtr name,
                          Pointer<COMObject> defaultValue,
                          Pointer<COMObject>)>>>()
          .value
          .asFunction<
              int Function(Pointer, int name, Pointer<COMObject> defaultValue,
                  Pointer<COMObject>)>()(
      ptr.ref.lpVtbl,
      nameHstring,
      defaultValue == null
          ? nullptr
          : defaultValue.ptr.cast<Pointer<COMObject>>().value,
      retValuePtr);

  if (FAILED(hr)) {
    free(retValuePtr);
    throw WindowsException(hr);
  }

  WindowsDeleteString(nameHstring);

  if (retValuePtr.ref.lpVtbl == nullptr) {
    free(retValuePtr);
    return null;
  }

  return JsonValue.fromRawPointer(retValuePtr);
}