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<H1><A NAME="_tapi2_linesenduseruserinfo"></A>lineSendUserUserInfo</H1>
<P>The <B>lineSendUserUserInfo</B> function sends user-user information to the remote party on the specified call. </P>
<PRE class=syntax><B>LONG WINAPI lineSendUserUserInfo(
HCALL</B><I> hCall</I><B>, </B>
<B> LPCSTR</B><I> lpsUserUserInfo</I><B>, </B>
<B> DWORD</B><I> dwSize </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hCall</I> </DT>
<DD>A handle to the call on which to send user-user information. The application must be an owner of the call. The call state of <I>hCall</I> must be <I>connected</I>, <I>offering</I>, <I>accepted</I>, or <I>ringback</I>. </DD>
<DT><I>lpsUserUserInfo</I> </DT>
<DD>A pointer to a string containing user-user information to be sent to the remote party. User-user information is only sent if supported by the underlying network (see <A HREF="struc2_67aq.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_67aq.htm"><B>LINEDEVCAPS</B></A>). The protocol discriminator field for the user-user information, if required, should appear as the first byte of the buffer pointed to by <I>lpsUserUserInfo</I>, and must be accounted for in <I>dwSize</I>. </DD>
<DT><I>dwSize</I> </DT>
<DD>The size in bytes of the user-user information in <I>lpsUserUserInfo</I>.
</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_INVALCALLHANDLE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLSTATE, LINEERR_OPERATIONFAILED, LINEERR_INVALPOINTER, LINEERR_RESOURCEUNAVAIL, LINEERR_NOMEM, LINEERR_USERUSERINFOTOOBIG, LINEERR_NOTOWNER, LINEERR_UNINITIALIZED.</P>
<H4>Remarks</H4>
<P>This function can be used to send user-user information at any time during a connected call. If the size of the specified information to be sent is larger than what can fit into a single network message (as in ISDN), the service provider is responsible for dividing the information into a sequence of chained network messages (using "more data"). </P>
<P>User-user information can also be sent as part of call accept, call reject, and call redirect, and when making calls. User-user information can also be received. The received information is available through the call's call-information record. Whenever user-user information arrives after call offering or prior to call disconnect, a <A HREF="msgs_1x0v.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1x0v.htm">LINE_CALLINFO</A> message with a <I>UserUserInfo</I> parameter notifies the application that user-user information in the call-information record has changed. If multiple network messages are chained, the information is assembled by the service provider and a single message is sent to the application. </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> 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="msgs_1x0v.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1x0v.htm">LINE_CALLINFO</A>, <A HREF="msgs_65mh.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mh.htm">LINE_REPLY</A>, <A HREF="struc2_67aq.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_67aq.htm"><B>LINEDEVCAPS</B></A></P>
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