擷取CAD目前比例尺方法

struct resbuf s_eb,v_eb;

 acedGetVar(_T("screensize"), &s_eb);

 acedGetVar(_T("viewsize"), &v_eb);

 double screenSize_H = s_eb.resval.rpoint[1];

 double viewSize = v_eb.resval.rreal;

 double scale = viewSize*3.77953 / screenSize_H ;

 return scale ;