ads_point与AcGePoint3d的相互转换：

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ads_point与AcGePoint3d的相互转换：
ads_point ->AcGePoint3d :asPnt3d
示例：
ads_point center, startPt；
if (acedGetPoint(NULL, "/nLocate center of polygon: ",
        center) != RTNORM)
    {
        return Acad::eInvalidInput;
    }

    startPt[0] = center[0];
    startPt[1] = center[1];
    startPt[2] = center[2];

AcGePoint3d ptCenter = asPnt3d(center);
AcGePoint3d ->ads_point :asDblArray
示例：
AcGePoint3d tempPt;
acedGetPoint(NULL, "/nEllipse center point: ",
        asDblArray(tempPt));


acedHelp:获取帮助
获取实体的范围：AcDbEntity::getGeomExtents()
获取对象的类名：CString str = AcDbEntity() ->desc() ->name()

CRichEditCtrl
在构造函数中加上：AfxInitRichEdit()

若在CAD环境中进行预览Dwg图,在Dlg中：
acdbDisplayPreviewFromDwg()
若不在CAD环境中进行DWG的预览，使用
DWGThumbnail.ocx控件即可