在AO+VB中应该用什么语句来测试与SDE连接成功?

<P>请问</P>
<P>在AO+VB(ArcGIS9.0)中应该用什么语句来测试与SDE是否连接成功?</P>
<P>谢谢!</P>

<P>好的.</P>
<img src="images/post/smile/dvbbs/em12.gif" /><img src="images/post/smile/dvbbs/em02.gif" />

<P>你用Iworkspace接口，如：</P>
<P>dim pWorkspace as IWorkspace</P>
<P>set pWorkspace=OpenSDE("....")</P>
<P>if pWorkspace is nothing then</P>
<P>    MsgBox "pWorkspace is Nothing!"</P>
<P>end if</P>