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- Convert a FORTRAN pointer to a C pointer
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<H2><A NAME="SECTION000213000000000000000"></A><A NAME="xref_cnfCptr"></A><A NAME="cnfCptr"></A>
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cnfCptr
- Convert a FORTRAN pointer to a C pointer
</H2>
<DL>
<DT><STRONG>Description:</STRONG>
<DD><DL>
<DD>Given a FORTRAN pointer, stored in a variable of type
F77_POINTER_TYPE, this function returns the equivalent C
pointer. Note that this conversion is only performed if the C
pointer has originally been registered (using
<A HREF="node184.html#cnfRegp"><TT>cnfRegp</TT></A>)
for use
from both C and FORTRAN. All pointers to space allocated by
<A HREF="node155.html#cnfCalloc"><TT>cnfCalloc</TT></A>
and
<A HREF="node183.html#cnfMalloc"><TT>cnfMalloc</TT></A>
are automatically registered in this
way.
</DL>
<BR>
<DT><STRONG>Invocation:</STRONG>
<DD><DL>
<DD><TT> cpointer = cnfCptr( fpointer )
</TT>
</DL>
<BR>
<DT><STRONG>Arguments:</STRONG>
<DD>
<BR>
<DL>
<DT><STRONG>
F77_POINTER_TYPE fpointer (Given)
</STRONG>
<DD>
The FORTRAN pointer value.
</DL>
<BR>
<DT><STRONG>Returned Value:</STRONG>
<DD>
<BR>
<DL>
<DT><STRONG>
void *cnfCptr
</STRONG>
<DD>
The equivalent C pointer.
</DL>
<BR>
<DT><STRONG>Notes:</STRONG>
<DD><UL><LI>A NULL value will be returned if the C pointer has not
previously been registered for use from both C and FORTRAN, or
if the FORTRAN pointer value supplied is zero.
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<ADDRESS>
<I>CNF and F77 Mixed Language Programming -- FORTRAN and C<BR>Starlink User Note 209<BR>P.M. Allan<BR>A.J. Chipperfield<BR>R.F. Warren-Smith<BR>19 January 2000<BR>E-mail:<A HREF="mailto:ussc@star.rl.ac.uk">ussc@star.rl.ac.uk</A></I>
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