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<H1><A NAME="_tapi2_linenegotiateextversion"></A>lineNegotiateExtVersion</H1>
<P>The <B>lineNegotiateExtVersion </B>function allows an application to negotiate an extension version to use with the specified line device. This operation need not be called if the application does not support extensions. </P>
<PRE class=syntax><B>LONG WINAPI lineNegotiateExtVersion(
HLINEAPP</B><I> hLineApp</I><B>, </B>
<B> DWORD</B><I> dwDeviceID</I><B>, </B>
<B> DWORD</B><I> dwAPIVersion</I><B>, </B>
<B> DWORD</B><I> dwExtLowVersion</I><B>, </B>
<B> DWORD</B><I> dwExtHighVersion</I><B>, </B>
<B> LPDWORD</B><I> lpdwExtVersion </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hLineApp</I> </DT>
<DD>The handle to the application's registration with TAPI. </DD>
<DT><I>dwDeviceID</I> </DT>
<DD>The line device to be queried. </DD>
<DT><I>dwAPIVersion</I> </DT>
<DD>The TAPI version number that was negotiated for the specified line device using <A HREF="func2_9kxa.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_9kxa.htm"><B>lineNegotiateAPIVersion</B></A>. </DD>
<DT><I>dwExtLowVersion</I> </DT>
<DD>The least recent extension version of the extension identifier returned by <B>lineNegotiateAPIVersion</B> that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number. </DD>
<DT><I>dwExtHighVersion</I> </DT>
<DD>The most recent extension version of the extension identifier returned by <B>lineNegotiateAPIVersion</B> that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number. </DD>
<DT><I>lpdwExtVersion</I> </DT>
<DD>A pointer to a <B>DWORD</B> that contains the extension version number that was negotiated. If negotiation succeeds, this number is in the range between <I>dwExtLowVersion</I> and <I>dwExtHighVersion</I>.
</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_BADDEVICEID, LINEERR_NOMEM, LINEERR_INCOMPATIBLEAPIVERSION, LINEERR_NODRIVER, LINEERR_INCOMPATIBLEEXTVERSION, LINEERR_OPERATIONFAILED, LINEERR_INVALAPPHANDLE, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALPOINTER, LINEERR_UNINITIALIZED, LINEERR_NODEVICE, LINEERR_OPERATIONUNAVAIL.</P>
<H4>Remarks</H4>
<P>Use <A HREF="func1_2o54.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2o54.htm"><B>lineInitializeEx</B></A> to determine the number of line devices present in the system. The device identifier specified by <I>dwDeviceID</I> varies from zero to one less than the number of line devices present. </P>
<P>The <A HREF="func2_9kxa.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_9kxa.htm"><B>lineNegotiateAPIVersion</B></A> function negotiates the API version number to use. It also retrieves the extension identifier supported by the line device, which is zeros if no extensions are provided. Version numbers should be incremented by one for each release. Leaving gaps in release version numbering can cause unexpected results. </P>
<P>If the application wants to use the extensions defined by the returned extension identifier, it must call <B>lineNegotiateExtVersion</B> to negotiate the extension version to use. </P>
<P>The extension version number negotiated is that under which the application and service provider must both operate. If version ranges do not overlap, the application and service provider versions are incompatible and an error is returned. </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_3in9.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_3in9.htm">Extended Telephony Services Reference</A>, <A HREF="func1_2o54.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2o54.htm"><B>lineInitializeEx</B></A>, <A HREF="func2_9kxa.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_9kxa.htm"><B>lineNegotiateAPIVersion</B></A></P>
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