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<H1><A NAME="_tapi2_lineregisterrequestrecipient"></A>lineRegisterRequestRecipient</H1>
<P>The <B>lineRegisterRequestRecipient</B> function registers the invoking application as a recipient of requests for the specified request mode. </P>
<PRE class=syntax><B>LONG WINAPI lineRegisterRequestRecipient(
</B> <B>HLINEAPP</B> <I>hLineApp</I><B>, </B>
<B> DWORD</B><I> dwRegistrationInstance</I><B>, </B>
<B> DWORD</B><I> dwRequestMode</I><B>, </B>
<B> DWORD</B><I> bEnable </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hLineApp</I> </DT>
<DD>The application's usage handle for the line portion of TAPI. </DD>
<DT><I>dwRegistrationInstance</I> </DT>
<DD>An application-specific <B>DWORD</B> that is passed back as a parameter of the <A HREF="msgs_4h84.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_4h84.htm">LINE_REQUEST</A> message. This message notifies the application that a request is pending. This parameter is ignored if <I>bEnable</I> is set to zero. This parameter is examined by TAPI only for registration, not for deregistration. The <I>dwRegistrationInstance</I> value used while deregistering need not match the <I>dwRegistrationInstance</I> used while registering for a request mode. </DD>
<DT><I>dwRequestMode</I> </DT>
<DD>The type or types of request for which the application registers. This parameter uses one or more of the <A HREF="constnts_2r5f.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/constnts_2r5f.htm">LINEREQUESTMODE_ Constants</A>. </DD>
<DT><I>bEnable</I> </DT>
<DD>If TRUE, the application registers the specified request modes; if FALSE, the application deregisters for the specified request modes.
</DD>
</DL>
<H4>Return Values</H4>
<P>Returns zero if the request succeeds or a negative error number if an error occurs. Possible return values are: </P>
<P>LINEERR_INVALAPPHANDLE, LINEERR_OPERATIONFAILED, LINEERR_INVALREQUESTMODE, LINEERR_RESOURCEUNAVAIL, LINEERR_NOMEM, LINEERR_UNINITIALIZED. </P>
<H4>Remarks</H4>
<P>A telephony-enabled application can request that a call be placed on its behalf by invoking <A HREF="func1_3vcc.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_3vcc.htm"><B>tapiRequestMakeCall</B></A>. Additionally, other applications can request that information be logged with a given call. The <B>tapiRequestMakeCall</B> requests are queued by TAPI, and the highest priority application that has registered to handle the request is sent a <A HREF="msgs_4h84.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_4h84.htm">LINE_REQUEST</A> message with an indication of the mode of the request that is pending. This application is typically the user's call-control application. </P>
<P>Next, the call-control application that receives this message invokes <A HREF="func1_2ek4.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2ek4.htm"><B>lineGetRequest</B></A>, specifying the request mode and a buffer that is large enough to hold the request. The call-control application then interprets and executes the request. </P>
<P>The recipient application is also automatically deregistered for all requests when it does a <A HREF="func2_7sq6.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_7sq6.htm"><B>lineShutdown</B></A>. </P>
<H4><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm \n\n這個文件不能通過 Teleport Pro 取回, 因為 地址在一個域或為它的開始地址設定的邊界的外部路徑上. \n\n你想從服務器打開它嗎?'))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_1pnp.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_1pnp.htm">Basic Telephony Services Reference</A>, <A HREF="msgs_4h84.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_4h84.htm">LINE_REQUEST</A>, <A HREF="func1_2ek4.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2ek4.htm"><B>lineGetRequest</B></A>, <A HREF="func2_7sq6.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_7sq6.htm"><B>lineShutdown</B></A>, <A HREF="func1_3vcc.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_3vcc.htm"><B>tapiRequestMakeCall</B></A></P>
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