[求助]关于如何使用mosymbol.dll文件中两个Draw方法问题？

<P>在mosymbol.dll文件中，提供了mopen和mopenlayer的两个Draw，我不懂是什么意思？</P>
<P>Mopen:</P>
<P>Sub Draw(hDC As Long, points As Long, partCounts As Long, numParts As Long)</P>
<P>mopenLayer</P>
<P>Sub Draw(hDC As Long, points As Long, partCounts As Long, numParts As Long, scale As Double)
</P>
<P>我想在VB中调用，画线和画层</P>