[求助]请教AcDbCurve::getPointAtDist执行失败原因
<p>我在代码里面使用下面语句：</p><p>Acad::ErrorStatus esPoly = Acad::eOk ;</p><p>esPoly = m_pPolyline->getPointAtDist( dLength, ptPos ) ; //m_pPolyline为AcDb2dPolyline类型</p><p>执行后esPoly的值是-858993460，但是如果我在执行getPointAtDist前加上下面一句：</p><p>esPoly = m_pPolyline->getFirstDeriv( ptPos, vtZDir ) ;</p><p>则getPointAtDist执行又是成功的，esPoly值为Acad::eOk，请问这是什么原因？</p><p>另外，</p><p> double dLength = 0.0 ;<br/> AcGePoint3d ptEnd ;<br/> m_pPolyline->getEndPoint( ptEnd ) ;<br/> m_pPolyline->getDistAtPoint( ptEnd, dLength ) ;<br/> AcGePoint3d pt ;<br/> Acad::ErrorStatus esPoly = m_pPolyline->getPointAtDist( ptEnd, dLength ) ;<br/>这里esPoly 为什么返回的是Acad::eInvalidInput？是不是因为精度原因？</p><p><br/></p>
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