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<H1><A NAME="_tapi2_line_reply"></A>LINE_REPLY</H1>

<P>The TAPI LINE_REPLY message is sent to report the results of function calls that completed asynchronously. </P>

<PRE class=syntax>LINE_REPLY
hDevice = (DWORD) 0;
dwCallbackInstance = (DWORD) hCallback;
dwParam1 = (DWORD) idRequest;
dwParam2 = (DWORD) Status;
dwParam3 = (DWORD) 0;</PRE>

<H4>Parameters</H4>

<DL>
<DT><I>hDevice</I> </DT>

<DD>Not used. </DD>

<DT><I>dwCallbackInstance</I> </DT>

<DD>Returns the application's callback instance. </DD>

<DT><I>dwParam1</I> </DT>

<DD>The request identifier for which this is the reply. </DD>

<DT><I>dwParam2</I> </DT>

<DD>The success or error indication. The application should cast this parameter into a LONG. Zero indicates success; a negative number indicates an error. </DD>

<DT><I>dwParam3</I> </DT>

<DD>Unused. 
</DD>
</DL>

<H4>Return Values</H4>

<P>No return value. </P>

<H4>Remarks</H4>

<P>Functions that operate asynchronously return a positive request identifier value to the application. This request identifier is returned with the reply message to identify the request that was completed. The other parameter for the LINE_REPLY message carries the success or failure indication. Possible errors are the same as those defined by the corresponding function. This message cannot be disabled. </P>

<P>In some cases, an application may fail to receive the LINE_REPLY message corresponding to a call to an asynchronous function. This occurs if the corresponding call handle is deallocated before the message has been received. </P>

<P class=note><B>Note</B>&nbsp;&nbsp;When an application invokes any asynchronous operation that writes data back into application memory, the application must keep that memory available for writing until a LINE_REPLY or <A HREF="msgs_65mb.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mb.htm">LINE_GATHERDIGITS</A> message is received.</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 2.0 or later.<BR>
<B>&nbsp;&nbsp;Header: </B>Declared in Tapi.h.</P>

<H4>See Also</H4>

<P><A HREF="msgs_65mb.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mb.htm">LINE_GATHERDIGITS</A> </P>
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