// 继承一个自己类，

    class LinkBlockMcDbGridPointData : public McDbGridPointData
    {
    public:
        virtual bool IsPermanentGrid();
    };

    //实现IsPermanentGrid虚函数，返回true，表示夹点按固定夹点模式显示
    bool LinkBlockMcDbGridPointData::IsPermanentGrid()
    {
        return true;
    }

    //  实现自定义实体的 getGripPointData函数，返回夹点详细信息

    McDbGridPointData* CLinkBlock::getGripPointData(int iGridIndex) const
    {
        assertReadEnabled();
        return new LinkBlockMcDbGridPointData();
    }