IContextNode::GetStrokeCount 方法
获取与 IContextNode 对象关联的笔划数。
语法
HRESULT GetStrokeCount(
[out] ULONG *pulStrokeCount
);
parameters
-
pulStrokeCount [out]
-
与 IContextNode 对象关联的笔划数。
返回值
有关返回值的说明,请参阅 类和接口 - 墨迹分析。
备注
只有墨迹叶上下文节点具有关联的笔划数据 (请参阅 IContextNode::GetType) 。
示例
此示例演示了一个方法, ExploreContextNode
该方法检查 IContextNode。 该方法将执行以下操作:
- 获取上下文节点的类型。
- 如果上下文节点是未分类的墨迹、分析提示或自定义识别器节点,则通过调用帮助程序方法检查节点类型的特定属性。
- 如果节点具有子节点,则通过调用自身来检查每个子节点。
- 如果节点是墨迹叶节点,则通过调用帮助程序方法检查节点的笔划数据。
HRESULT CMyClass::ExploreContextNode(
IContextNode *pContextNode)
{
// Check for certain types of context nodes.
GUID ContextNodeType;
HRESULT hr = pContextNode->GetType(&ContextNodeType);
if (SUCCEEDED(hr))
{
if (IsEqualGUID(GUID_CNT_UNCLASSIFIEDINK, ContextNodeType))
{
// Call a helper method that explores unclassified ink nodes.
hr = this->ExploreUnclassifiedInkNode(pContextNode);
}
else if (IsEqualGUID(GUID_CNT_ANALYSISHINT, ContextNodeType))
{
// Call a helper method that explores analysis hint nodes.
hr = this->ExploreAnalysisHintNode(pContextNode);
}
else if (IsEqualGUID(GUID_CNT_CUSTOMRECOGNIZER, ContextNodeType))
{
// Call a helper method that explores custom recognizer nodes.
hr = this->ExploreCustomRecognizerNode(pContextNode);
}
if (SUCCEEDED(hr))
{
// Check if this node is a branch or a leaf node.
IContextNodes *pSubNodes = NULL;
hr = pContextNode->GetSubNodes(&pSubNodes);
if (SUCCEEDED(hr))
{
ULONG ulSubNodeCount;
hr = pSubNodes->GetCount(&ulSubNodeCount);
if (SUCCEEDED(hr))
{
if (ulSubNodeCount > 0)
{
// This node has child nodes; explore each child node.
IContextNode *pSubNode = NULL;
for (ULONG index=0; index<ulSubNodeCount; index++)
{
hr = pSubNodes->GetContextNode(index, &pSubNode);
if (SUCCEEDED(hr))
{
// Recursive call to explore the child node of this
// context node.
hr = this->ExploreContextNode(pSubNode);
}
// Release this reference to the child context node.
if (pSubNode != NULL)
{
pSubNode->Release();
pSubNode = NULL;
}
if (FAILED(hr))
{
break;
}
}
}
else
{
// This is a leaf node. Check if it contains stroke data.
ULONG ulStrokeCount;
hr = pContextNode->GetStrokeCount(&ulStrokeCount);
if (SUCCEEDED(hr))
{
if (ulStrokeCount > 0)
{
// This node is an ink leaf node; call helper
// method that explores available stroke data.
hr = this->ExploreNodeStrokeData(pContextNode);
}
}
}
}
}
// Release this reference to the subnodes collection.
if (pSubNodes != NULL)
{
pSubNodes->Release();
pSubNodes = NULL;
}
}
}
return hr;
}
要求
要求 | 值 |
---|---|
最低受支持的客户端 |
Windows XP Tablet PC Edition [仅限桌面应用] |
最低受支持的服务器 |
无受支持的版本 |
标头 |
|
DLL |
|