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<H1><A NAME="_tapi2_line_monitormedia"></A>LINE_MONITORMEDIA</H1>
<P>The TAPI LINE_MONITORMEDIA message is sent when a change in the call's media type is detected. The sending of this message is controlled with the <A HREF="func2_2zkx.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_2zkx.htm"><B>lineMonitorMedia</B></A> function. </P>
<PRE class=syntax>LINE_MONITORMEDIA
hDevice = (DWORD) hCall;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) MediaMode;
dwParam2 = (DWORD) 0;
dwParam3 = (DWORD) TickCount;</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 line. </DD>
<DT><I>dwParam1</I> </DT>
<DD>The new media type (or mode). This parameter must be one and only one of the <A HREF="constnts_0x6b.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/constnts_0x6b.htm">LINEMEDIAMODE_ constants</A>.</DD>
<DT><I>dwParam2</I> </DT>
<DD>Unused. </DD>
<DT><I>dwParam3</I> </DT>
<DD>The "tick count" (number of milliseconds since Windows started) at which the specified media was detected. For TAPI versions earlier than 2.0, this parameter is unused.
</DD>
</DL>
<H4>Return Values</H4>
<P>No return value. </P>
<H4>Remarks</H4>
<P>The LINE_MONITORMEDIA message is sent to the application that has enabled media monitoring for the media type detected. </P>
<P>Because this timestamp may have been generated on a computer other than the one on which the application is executing, it is useful only for comparison to other similarly timestamped messages generated on the same line device (<A HREF="msgs_65mb.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mb.htm">LINE_GATHERDIGITS</A>, <A HREF="msgs_0hnp.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_0hnp.htm">LINE_GENERATE</A>, <A HREF="msgs_5p0z.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_5p0z.htm">LINE_MONITORDIGITS</A>, <A HREF="msgs_8nz9.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_8nz9.htm">LINE_MONITORTONE</A>), in order to determine their <I>relative</I> timing (separation between events). The tick count can "wrap around" after approximately 49.7 days; applications must take this into account when performing calculations. </P>
<P>If the service provider does not generate the timestamp (for example, if it was created using an earlier version of TAPI), then TAPI provides a timestamp at the point closest to the service provider generating the event so that the synthesized timestamp is as accurate as possible. </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="msgs_65mb.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mb.htm">LINE_GATHERDIGITS</A>, <A HREF="msgs_0hnp.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_0hnp.htm">LINE_GENERATE</A>, <A HREF="msgs_5p0z.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_5p0z.htm">LINE_MONITORDIGITS</A>, <A HREF="msgs_8nz9.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_8nz9.htm">LINE_MONITORTONE</A> </P>
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