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<H1><A NAME="_tapi2_lineswaphold"></A>lineSwapHold</H1>
<P>The <B>lineSwapHold</B> function swaps the specified active call with the specified call on consultation hold. </P>
<PRE class=syntax><B>LONG WINAPI lineSwapHold(
</B> <B>HCALL</B> <I>hActiveCall</I><B>, </B>
<B> HCALL</B><I> hHeldCall </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hActiveCall</I> </DT>
<DD>The handle to the active call. The application must be an owner of the call. The call state of <I>hActiveCall</I> must be <I>connected</I>. </DD>
<DT><I>hHeldCall</I> </DT>
<DD>The handle to the consultation call. The application must be an owner of the call. The call state of <I>hHeldCall</I> can be <I>onHoldPendingTransfer, onHoldPendingConference, </I>or <I>onHold</I>.
</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_INVALCALLHANDLE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLSTATE, LINEERR_OPERATIONFAILED, LINEERR_NOMEM, LINEERR_RESOURCEUNAVAIL, LINEERR_NOTOWNER, LINEERR_UNINITIALIZED.</P>
<H4>Remarks</H4>
<P>Swapping the active call with the call on consultation hold allows the application to alternate or toggle between these two calls. This is typical in call waiting. </P>
<H4><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm \n\n這個(gè)文件不能通過 Teleport Pro 取回, 因?yàn)?地址在一個(gè)域或?yàn)樗拈_始地址設(shè)定的邊界的外部路徑上. \n\n你想從服務(wù)器打開它嗎?'))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> Windows NT/2000: </B>Requires Windows NT 4.0 SP3 or later.<BR>
<B> Windows 95/98: </B>Requires Windows 95 or later.<BR>
<B> Version: </B>Requires TAPI 1.3 or later.<BR>
<B> Header: </B>Declared in Tapi.h.<BR>
<B> 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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