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<H1><A NAME="_tapi2_linesetmediamode"></A>lineSetMediaMode</H1>
<P>The <B>lineSetMediaMode</B> function sets the media type(s) of the specified call in its <A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A> structure. </P>
<PRE class=syntax><B>LONG WINAPI lineSetMediaMode(
HCALL</B><I> hCall</I><B>, </B>
<B> DWORD</B><I> dwMediaModes </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hCall</I> </DT>
<DD>A handle to the call whose media type is to be changed. The application must be an owner of the call. The call state of <I>hCall</I> can be any state. </DD>
<DT><I>dwMediaModes</I> </DT>
<DD>The new media type(s) for the call. This parameter uses the <A HREF="constnts_0x6b.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/constnts_0x6b.htm">LINEMEDIAMODE_ Constants</A>. As long as the UNKNOWN media type flag is set, other media type flags may be set as well. This is used to identify a call's media type as not fully determined, but narrowed down to one of a small set of specified media types. If the UNKNOWN flag is not set, only a single media type can be specified.
</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_INVALCALLHANDLE, LINEERR_OPERATIONFAILED, LINEERR_INVALMEDIAMODE, LINEERR_RESOURCEUNAVAIL, LINEERR_NOMEM, LINEERR_UNINITIALIZED, LINEERR_OPERATIONUNAVAIL. </P>
<H4>Remarks</H4>
<P>The <B>lineSetMediaMode</B> function changes the call's media type in its <A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A> structure. Typical usage of this operation is either to set a call's media type to a specific known media type or to exclude possible media types as long as the call's media type is officially unknown (the UNKNOWN media type flag is set). </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_6gvn.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_6gvn.htm">Supplementary Line Service Functions</A>, <A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A></P>
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