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<H1>IBM Visualization Data Explorer Programmer's Reference</H1>
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<H3><A NAME="HDRDXCRIH" HREF="progu097.htm#PToC_208">DXCheckRIH</A></H3>
<A NAME="IDX1582"></A>
<A NAME="IDX1583"></A>
<P><STRONG>Function</STRONG>
<P>
Checks registered input handlers.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
#include <dx/dx.h><BR>
<P><BR>
int DXCheckRIH(int block);<BR>
<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
This routine must be called periodically in a stand-alone program if the
<TT><STRONG>DXRegisterInputHandler</STRONG></TT> routine is used to
define an input handler.
(The executive provides this function automatically for built-in Data Explorer
routines.)
<P>
<TT><STRONG>DXCheckRIH</STRONG></TT> determines whether any input handlers
need to be called and, if so, calls them before
returning.
The valid arguments for <TT><STRONG>block</STRONG></TT> are:
<DL COMPACT>
<DD>0 = Check whether any events need handling.
If not, return.
Otherwise, handle the event(s) and return.
<DD>1 = Do not return until an event that requires handling occurs.
</DL>
<P>
If the Display module is part of your stand-alone program, this routine
must be called, since Display uses an input handler to deal with
external events (e.g., repainting window contents after they
have been obscured).
<P>
If the SuperviseState module (<A
HREF="refgu152.htm#HDRSUPSTAT">SuperviseState</A> in <I>IBM Visualization Data
Explorer User's Reference</I>) is
being used in conjunction with Display to implement direct interaction,
<TT><STRONG>DXCheckRIH</STRONG></TT> must not be called between SuperviseState
and Display. This will ensure that SuperviseState passes up-to-date
state information into Display.
<P><STRONG>Return Value</STRONG>
<P>
Returns 1 if an event required handling; otherwise return 0.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu289.htm#HDRDXREGIH">DXRegisterInputHandler</A>
</STRONG></TT>
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