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<H1><A NAME="_tapi2_lineunpark"></A>lineUnpark</H1>

<P>The <B>lineUnpark</B> function retrieves the call parked at the specified address and returns a call handle for it. </P>

<PRE class=syntax><B>LONG WINAPI lineUnpark(
  HLINE</B><I> hLine</I><B>,            </B>
<B>  DWORD</B><I> dwAddressID</I><B>,      </B>
<B>  LPHCALL</B><I> lphCall</I><B>,        </B>
<B>  LPCSTR</B><I> lpszDestAddress  </I>
<B>);</B></PRE>

<H4>Parameters</H4>

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

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

<DT><I>dwAddressID</I> </DT>

<DD>The address on <I>hLine</I> at which the unpark is to be originated. An address identifier is permanently associated with an address; the identifier remains constant across operating system upgrades.</DD>

<DT><I>lphCall</I> </DT>

<DD>A pointer to the location of type HCALL where the handle to the unparked call is returned. This handle is unrelated to any other handle that might have been previously associated with the retrieved call, such as the handle that might have been associated with the call when it was originally parked. The application is the initial sole owner of this call. </DD>

<DT><I>lpszDestAddress</I> </DT>

<DD>A pointer to a null-terminated character buffer that contains the address where the call is parked. The address is in standard dialable address format. 
</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_INVALADDRESS, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALADDRESSID, LINEERR_OPERATIONFAILED, LINEERR_INVALLINEHANDLE, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALPOINTER, LINEERR_UNINITIALIZED, LINEERR_NOMEM.</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.<BR>
<B>&nbsp;&nbsp;Unicode: </B>Implemented as Unicode and ANSI versions on all platforms.</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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