#include <d2d1.h>

// CD2DPathGeometry 类定义
class CD2DPathGeometry
{
public:
    // ...

    // 获取 ID2D1PathGeometry 对象中所有子路径的段的总数
    UINT GetSegmentCount() const;

    // ...

private:
    // 私有数据成员和其他成员函数...
    ID2D1PathGeometry* m_pPathGeometry;
};

// CD2DPathGeometry 类实现
UINT CD2DPathGeometry::GetSegmentCount() const
{
    if (m_pPathGeometry == nullptr)
    {
        // 可以在此添加错误处理逻辑，例如返回 0 或抛出异常
        return 0;
    }

    UINT segmentCount = 0;

    // 遍历所有子路径
    ID2D1GeometrySink* pSink = nullptr;
    HRESULT hr = m_pPathGeometry->Open(&pSink);

    if (SUCCEEDED(hr))
    {
        pSink->AddRef();
        pSink->Close();

        ID2D1GeometrySink* pIterSink = nullptr;
        hr = m_pPathGeometry->Open(&pIterSink);

        if (SUCCEEDED(hr))
        {
            while (SUCCEEDED(pIterSink->NextFigure(D2D1_FIGURE_BEGIN)))
            {
                D2D1_PATH_SEGMENT segment;
                while (SUCCEEDED(pIterSink->NextSegment(&segment)))
                {
                    // 处理每个段
                    segmentCount++;
                }
            }

            pIterSink->Close();
            pIterSink->Release();
        }

        pSink->Release();
    }

    return segmentCount;
}

// ...