## Node::NextPreOrder method


Gets next node according to the pre-order tree traversal algorithm.

```cpp
System::SharedPtr<Aspose::Words::Node> Aspose::Words::Node::NextPreOrder(const System::SharedPtr<Aspose::Words::Node> &rootNode)
```


| Parameter | Type | Description |
| --- | --- | --- |
| rootNode | const System::SharedPtr\<Aspose::Words::Node\>\& | The top node (limit) of traversal. |

### ReturnValue

Next node in pre-order order. Null if reached the *rootNode*.

## Examples



Shows how to traverse the document's node tree using the pre-order traversal algorithm, and delete any encountered shape with an image. 
```cpp
auto doc = System::MakeObject<Aspose::Words::Document>(System::String(get_MyDir() + u"Images.docx"));

ASSERT_EQ(9, doc->GetChildNodes(NodeType::Shape, true)->LINQ_OfType<System::SharedPtr<Aspose::Words::Drawing::Shape>>()->LINQ_Count(static_cast<System::Func<System::SharedPtr<Aspose::Words::Drawing::Shape>, bool>>(static_cast<std::function<bool(System::SharedPtr<Aspose::Words::Drawing::Shape> s)>>([](System::SharedPtr<Aspose::Words::Drawing::Shape> s) -> bool
{
    return s->get_HasImage();
}))));

System::SharedPtr<Aspose::Words::Node> curNode = doc;
while (curNode != nullptr)
{
    System::SharedPtr<Aspose::Words::Node> nextNode = curNode->NextPreOrder(doc);

    if (curNode->PreviousPreOrder(doc) != nullptr && nextNode != nullptr)
    {
        ASPOSE_ASSERT_EQ(curNode, nextNode->PreviousPreOrder(doc));
    }

    if (curNode->get_NodeType() == NodeType::Shape && (System::ExplicitCast<Aspose::Words::Drawing::Shape>(curNode))->get_HasImage())
    {
        curNode->Remove();
    }

    curNode = nextNode;
}

ASSERT_EQ(0, doc->GetChildNodes(NodeType::Shape, true)->LINQ_OfType<System::SharedPtr<Aspose::Words::Drawing::Shape>>()->LINQ_Count(static_cast<System::Func<System::SharedPtr<Aspose::Words::Drawing::Shape>, bool>>(static_cast<std::function<bool(System::SharedPtr<Aspose::Words::Drawing::Shape> s)>>([](System::SharedPtr<Aspose::Words::Drawing::Shape> s) -> bool
{
    return s->get_HasImage();
}))));
```

## See Also

* Class [Node](../)
* Class [Node](../)
* Namespace [Aspose::Words](../../)
* Library [Aspose.Words for C++](../../../)