conn</TT
>.)

</P><PRE
CLASS="SYNOPSIS"
>int PQsetInstanceData(PGconn *conn, PGEventProc proc, void *data);</PRE
><P>
      </P
></DD
><DT
><A
NAME="LIBPQ-PQINSTANCEDATA"
></A
><CODE
CLASS="FUNCTION"
>PQinstanceData</CODE
>
      </DT
><DD
><P
>       Returns the
       connection <TT
CLASS="PARAMETER"
>conn</TT
>'s <TT
CLASS="LITERAL"
>instanceData</TT
>
       associated with procedure <TT
CLASS="PARAMETER"
>proc</TT
>,
       or <TT
CLASS="SYMBOL"
>NULL</TT
> if there is none.

</P><PRE
CLASS="SYNOPSIS"
