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<H1><A NAME="_tapi2_lineuncompletecall"></A>lineUncompleteCall</H1>

<P>The <B>lineUncompleteCall</B> function cancels the specified call completion request on the specified line. </P>

<PRE class=syntax><B>LONG WINAPI lineUncompleteCall(
  HLINE</B><I> hLine</I><B>,          </B>
<B>  DWORD</B><I> dwCompletionID  </I>
<B>);</B></PRE>

<H4>Parameters</H4>

<DL>
<DT><I>hLine</I> </DT>

<DD>A handle to the line device on which a call completion is to be canceled. </DD>

<DT><I>dwCompletionID</I> </DT>

<DD>The completion identifier for the request that is to be canceled. 
</DD>
</DL>

<H4>Return Values</H4>

<P>Returns a positive request identifier if the function is completed asynchronously, or a negative error number if an error occurs. The <I>dwParam2</I> parameter of the corresponding <A HREF="msgs_65mh.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mh.htm">LINE_REPLY</A> message is zero if the function succeeds or it is a negative error number if an error occurs. Possible return values are: </P>

<P>LINEERR_INVALLINEHANDLE, LINEERR_OPERATIONFAILED, LINEERR_INVALCOMPLETIONID, LINEERR_RESOURCEUNAVAIL, LINEERR_NOMEM, LINEERR_UNINITIALIZED, LINEERR_OPERATIONUNAVAIL. </P>

<H4><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm  \n\n这个文件不能通过 Teleport Pro 取回, 因为 地址在一个域或为它的开始地址设定的边界的外部路径上.  \n\n你想从服务器打开它吗?'))window.location='http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm'" tppabs="http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm">Requirements</A> </H4>

<P><B>&nbsp;&nbsp;Windows NT/2000: </B>Requires Windows NT 4.0 SP3 or later.<BR>
<B>&nbsp;&nbsp;Windows 95/98: </B>Requires Windows 95 or later.<BR>
<B>&nbsp;&nbsp;Version: </B>Requires TAPI 1.3 or later.<BR>
<B>&nbsp;&nbsp;Header: </B>Declared in Tapi.h.<BR>
<B>&nbsp;&nbsp;Library: </B>Use Tapi32.lib.</P>

<H4>See Also</H4>

<P><A HREF="quickref_1okl.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_1okl.htm">TAPI 2.2 Reference Overview</A>, <A HREF="quickref_6gvn.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_6gvn.htm">Supplementary Line Service Functions</A>, <A HREF="msgs_65mh.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mh.htm">LINE_REPLY</A></P>
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