【解决办法】 建议参考以下代码开启在节点编辑模式下开启节点捕捉效果:
UGMapEditorWnd* mapWnd = mapControl->GetUGMapWnd();
mapWnd->SetUserAction(UGDrawParamaters::uaTrack);
UGEditToolPack* toolPack = mapWnd->GetEditToolPack();
toolPack->SetSnapeToolEnable(true);
toolPack->SetAccessibilityActionPointMode(UGEditType::EAA_AddPoint);