Introduction - If you have any usage issues, please Google them yourself
About DWG file format, OpenCAD given a format. I had a network up and down the C++ source code, not in English, is written in Esperanto. I tried to translate into C# version, we found only a part of the analysis of DWG data. And OpenCAD instructions given in reference format, I will share my research process. Also hope to get the results in this respect the guidance of a master. For friends who are interested are also welcome exchange. Here attached the network up and down the C++ source code, interested friends together under study.