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<H1><A NAME="_tapi2_phonebuttonstate__constants"></A>PHONEBUTTONSTATE_ Constants</H1>
<P>The PHONEBUTTONSTATE_ bit-flag constants describe the button's positions.
<DL>
<DT>PHONEBUTTONSTATE_DOWN </DT>
<DD>The button is in the "down" state (pressed down). </DD>
<DT>PHONEBUTTONSTATE_UNAVAIL </DT>
<DD>Indicates that the up or down state of the button is not known to the service provider, and will not become known at a future time. (TAPI versions 1.4 and later)</DD>
<DT>PHONEBUTTONSTATE_UNKNOWN </DT>
<DD>Indicates that the up or down state of the button is not known at this time, but may become known at a future time. (TAPI versions 1.4 and later)</DD>
<DT>PHONEBUTTONSTATE_UP </DT>
<DD>The button is in the "up" state.
</DD>
</DL>
<P>No extensibility. All 32 bits are reserved. </P>
<P>For backward compatibility, it is the responsibility of the service provider to examine the negotiated API version on the phone, and to not use those PHONEBUTTONSTATE_ values that the negotiated version does not support. </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 2.0 or later.<BR>
<B> Header: </B>Declared in Tapi.h.</P>
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