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<H1><A NAME="_tapi2_line_callinfo"></A>LINE_CALLINFO</H1>
<P>The TAPI LINE_CALLINFO message is sent when the call information about the specified call has changed. The application can invoke <A HREF="func1_96cv.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_96cv.htm"><B>lineGetCallInfo</B></A> to determine the current call information. </P>
<PRE class=syntax>LINE_CALLINFO
hDevice = (DWORD) hCall;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) CallInfoState;
dwParam2 = (DWORD) 0;
dwParam3 = (DWORD) 0;</PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hDevice</I> </DT>
<DD>A handle to the call. </DD>
<DT><I>dwCallbackInstance</I> </DT>
<DD>The callback instance supplied when opening the call's line. </DD>
<DT><I>dwParam1</I> </DT>
<DD>The call information item that has changed. Can be one or more of the <A HREF="constnts_7alv.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/constnts_7alv.htm">LINECALLINFOSTATE_ constants</A>. </DD>
<DT><I>dwParam2</I> </DT>
<DD>Unused. </DD>
<DT><I>dwParam3</I> </DT>
<DD>Unused.
</DD>
</DL>
<H4>Return Values</H4>
<P>No return value. </P>
<H4>Remarks</H4>
<P>A LINE_CALLINFO message with a <I>NumOwnersIncr</I>, <I>NumOwnersDecr</I>, and/or <I>NumMonitorsChanged</I> indication is sent to applications that already have a handle for the call. This can be the result of another application changing ownership or monitorship to a call with <A HREF="func2_34by.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_34by.htm"><B>lineOpen</B></A>, <A HREF="func1_2zhh.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2zhh.htm"><B>lineClose</B></A>, <A HREF="func2_7sq6.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_7sq6.htm"><B>lineShutdown</B></A>, <A HREF="func2_34px.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_34px.htm"><B>lineSetCallPrivilege</B></A>, <A HREF="func1_1fg3.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_1fg3.htm"><B>lineGetNewCalls</B></A>, and <A HREF="func1_5qlv.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_5qlv.htm"><B>lineGetConfRelatedCalls</B></A>. </P>
<P>These LINE_CALLINFO messages are not sent when a notification of a new call is provided in a <A HREF="msgs_1xid.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1xid.htm">LINE_CALLSTATE</A> message, because the call information already reflects the correct number of owners and monitors at the time the LINE_CALLSTATE messages are sent. LINE_CALLINFO messages are also suppressed in the case where a call is offered by TAPI to monitors through the LINECALLSTATE_UNKNOWN mechanism. </P>
<P class=note><B>Note</B> The application that causes a change in the number of owners or monitors (for example, by invoking <A HREF="func1_3wto.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_3wto.htm"><B>lineDeallocateCall</B></A> or <A HREF="func2_34px.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_34px.htm"><B>lineSetCallPrivilege</B></A>) does not itself receive a message indicating that the change has been done. </P>
<P>No LINE_CALLINFO messages are sent for a call after the call has entered the <I>idle</I> state. Specifically, changes in the number of owners and monitors are not reported as applications deallocate their handles for the idle call. </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 2.0 or later.<BR>
<B> Header: </B>Declared in Tapi.h.</P>
<H4>See Also</H4>
<P><A HREF="func1_2zhh.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2zhh.htm"><B>lineClose</B></A>, <A HREF="func1_3wto.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_3wto.htm"><B>lineDeallocateCall</B></A>, <A HREF="func1_96cv.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_96cv.htm"><B>lineGetCallInfo</B></A>, <A HREF="func1_5qlv.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_5qlv.htm"><B>lineGetConfRelatedCalls</B></A>, <A HREF="func1_1fg3.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_1fg3.htm"><B>lineGetNewCalls</B></A>, <A HREF="func2_34by.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_34by.htm"><B>lineOpen</B></A>, <A HREF="func2_34px.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_34px.htm"><B>lineSetCallPrivilege</B></A>, <A HREF="func2_7sq6.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_7sq6.htm"><B>lineShutdown</B></A> </P>
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