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<H1><A NAME="_tapi2_phonedevspecific"></A>phoneDevSpecific</H1>

<P>The <B>phoneDevSpecific</B> function is used as a general extension mechanism to enable a Telephony API implementation to provide features not described in the other TAPI functions. The meanings of these extensions are device specific. </P>

<PRE class=syntax><B>LONG WINAPI phoneDevSpecific(
  HPHONE</B><I> hPhone</I><B>,    </B>
<B>  LPVOID</B><I> lpParams</I><B>,  </B>
<B>  DWORD</B><I> dwSize      </I>
<B>);</B></PRE>

<H4>Parameters</H4>

<DL>
<DT><I>hPhone</I> </DT>

<DD>A handle to a phone device. </DD>

<DT><I>lpParams</I> </DT>

<DD>A pointer to a memory area used to hold a parameter block. Its interpretation is device specific. The contents of the parameter block are passed unchanged to or from the service provider by TAPI. </DD>

<DT><I>dwSize</I> </DT>

<DD>The size in bytes of the parameter block area. 
</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_0ut5.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_0ut5.htm">PHONE_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>PHONEERR_INVALPHONEHANDLE, PHONEERR_NOMEM, PHONEERR_INVALPOINTER, PHONEERR_RESOURCEUNAVAIL, PHONEERR_OPERATIONUNAVAIL, PHONEERR_UNINITIALIZED, PHONEERR_OPERATIONFAILED.</P>

<P>Additional return values are device specific. </P>

<H4>Remarks</H4>

<P>This operation provides a generic parameter profile. The interpretation of the parameter block is device specific. Indications and replies that are device specific should use the <A HREF="msgs_6nc3.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_6nc3.htm">PHONE_DEVSPECIFIC</A> message. </P>

<P>A service provider can provide access to device-specific functions by defining parameters for use with this operation. Applications that want to make use of these device-specific extensions should consult the device-specific (vendor-specific) documentation that describes which extensions are defined. Typicaly, an application that relies on these device-specific extensions is not portable to work with other service-provider environments. </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>&nbsp;&nbsp;Windows NT/2000: </B>Requires Windows NT 4.0 SP3 or later.<BR>
<B>&nbsp;&nbsp;Windows 95/98: </B>Requires Windows 95 or later.<BR>
<B>&nbsp;&nbsp;Version: </B>Requires TAPI 1.3 or later.<BR>
<B>&nbsp;&nbsp;Header: </B>Declared in Tapi.h.<BR>
<B>&nbsp;&nbsp;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="msgs_6nc3.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_6nc3.htm">PHONE_DEVSPECIFIC</A>, <A HREF="msgs_0ut5.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_0ut5.htm">PHONE_REPLY</A></P>
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