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<H1><A NAME="_tapi2_linenegotiateapiversion"></A>lineNegotiateAPIVersion</H1>
<P>The <B>lineNegotiateAPIVersion</B> function allows an application to negotiate an API version to use. </P>
<PRE class=syntax><B>LONG WINAPI lineNegotiateAPIVersion(
HLINEAPP</B><I> hLineApp</I><B>, </B>
<B> DWORD</B><I> dwDeviceID</I><B>, </B>
<B> DWORD</B><I> dwAPILowVersion</I><B>, </B>
<B> DWORD</B><I> dwAPIHighVersion</I><B>, </B>
<B> LPDWORD</B><I> lpdwAPIVersion</I><B>, </B>
<B> LPLINEEXTENSIONID</B><I> lpExtensionID </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>dwAPILowVersion</I> </DT>
<DD>The least recent TAPI version 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>dwAPIHighVersion</I> </DT>
<DD>The most recent TAPI version 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>lpdwAPIVersion</I> </DT>
<DD>A pointer to a <B>DWORD</B> that contains the TAPI version number that was negotiated. If negotiation succeeds, this number is in the range between <I>dwAPILowVersion</I> and <I>dwAPIHighVersion</I>. </DD>
<DT><I>lpExtensionID</I> </DT>
<DD>A pointer to a structure of type <A HREF="struc2_1t6a.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_1t6a.htm"><B>LINEEXTENSIONID</B></A>. If the service provider for the specified <I>dwDeviceID</I> supports provider-specific extensions, then, upon a successful negotiation, this structure is filled with the extension identifier of these extensions. This structure contains all zeros if the line provides no extensions. An application can ignore the returned parameter if it does not use extensions.
</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_NODRIVER, LINEERR_INCOMPATIBLEAPIVERSION, LINEERR_OPERATIONFAILED, LINEERR_INVALAPPHANDLE, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALPOINTER, LINEERR_UNINITIALIZED, LINEERR_NOMEM, LINEERR_OPERATIONUNAVAIL, LINEERR_NODEVICE. </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 <B>lineNegotiateAPIVersion</B> function is used to negotiate the API version number to use. It also retrieves the extension identifier supported by the line device, and returns zeros if no extensions are supported. If the application wants to use the extensions defined by the returned extension identifier, it must call <A HREF="func2_3p66.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_3p66.htm"><B>lineNegotiateExtVersion</B></A> to negotiate the extension version to use. </P>
<P>The API version number negotiated is that under which TAPI can operate. If version ranges do not overlap, the application and API or 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_1pnp.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_1pnp.htm">Basic Telephony Services Reference</A>, <A HREF="struc2_1t6a.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_1t6a.htm"><B>LINEEXTENSIONID</B></A>, <A HREF="func1_2o54.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_2o54.htm"><B>lineInitializeEx</B></A>, <A HREF="func2_3p66.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_3p66.htm"><B>lineNegotiateExtVersion</B></A>, <A HREF="intro_9dyf.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/intro_9dyf.htm">TAPI Versions</A> </P>
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