I got some taught about the CAD secondary development.I use a dll 'Teigha' to analysis the dwg file. But there no have any API can get the CAD drawing's xrefs ,so How to got the drawing's xrefs. I tried to get the xrefs's path and analysis it as a normal drawing(I save the xrefs data to the main drawing (I think when I finished it and it can become one drawing )) but I got nothing.Why? Then I found even though I got the all data(main drawing and xrefs) I still cannot get the correct data because the xrefs in the main drawing cant copy paste .I cannot get these change,Only I can got the origin xrefs. So what can I do ?
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In Teigha, you must use the
OdDbXrefGraph.getFrommethod to obtain the graph of the Xrefs. After that, you can explore the graph in a way similar to this.