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<H1><A NAME="_tapi2_linecallbackfunc"></A>lineCallbackFunc</H1>
<P>The <B>lineCallbackFunc</B> function is a placeholder for the application-supplied function name. </P>
<PRE class=syntax><B>VOID FAR PASCAL lineCallbackFunc(
DWORD</B><I> hDevice</I><B>, </B>
<B> DWORD</B><I> dwMsg</I><B>, </B>
<B> DWORD</B><I> dwCallbackInstance</I><B>, </B>
<B> DWORD</B><I> dwParam1</I><B>, </B>
<B> DWORD</B><I> dwParam2</I><B>, </B>
<B> DWORD</B><I> dwParam3 </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hDevice</I> </DT>
<DD>A handle to either a line device or a call associated with the callback. The nature of this handle (line handle or call handle) can be determined by the context provided by <I>dwMsg</I>. Applications must use the <B>DWORD</B> type for this parameter because using the <B>HANDLE</B> type may generate an error. </DD>
<DT><I>dwMsg</I> </DT>
<DD>A line or call device message. </DD>
<DT><I>dwCallbackInstance</I> </DT>
<DD>Callback instance data passed back to the application in the callback. This <B>DWORD</B> is not interpreted by TAPI. </DD>
<DT><I>dwParam1</I> </DT>
<DD>A parameter for the message. </DD>
<DT><I>dwParam2</I> </DT>
<DD>A parameter for the message. </DD>
<DT><I>dwParam3</I> </DT>
<DD>A parameter for the message.
</DD>
</DL>
<H4>Remarks</H4>
<P>For information about parameter values passed to this function, see <A HREF="msgs_3zcj.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_3zcj.htm">Line Device Messages</A>. </P>
<P>All callbacks occur in the application's context. The callback function must reside in a DLL or application module. </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.</P>
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