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<TITLE>IBM Visualization Data Explorer Programmer's Reference</TITLE>
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<META HTTP-EQUIV="updated" CONTENT="Tue, 16 Sep 1997 ">
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<H1>IBM Visualization Data Explorer Programmer's Reference</H1>
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<H3><A NAME="HDRDXPP" HREF="progu097.htm#PToC_365">DXProcessParts</A></H3>
<A NAME="IDX1959"></A>
<A NAME="IDX1960"></A>
<P><STRONG>Function</STRONG>
<P>
Applies a function to every constituent Field (part) of a specified
Object.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
#include <dx/dx.h><BR>
<P><BR>
Object DXProcessParts(Object object, Field (*process)(Field, Pointer, int),<BR>
Pointer args, int size, int copy, int preserve)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
<P>
If the input
<TT><STRONG>
Object
</STRONG></TT>
is a Field, this
routine returns the result of the
<TT><STRONG>
process
</STRONG></TT>
function on that Field.
<P>
If the input
<TT><STRONG>
Object
</STRONG></TT>
is a Group and
<TT><STRONG>
copy
</STRONG></TT>
is 1, this routine recursively makes a copy of the Group and
all subgroups. In this case, the
order of the Fields in the Groups is preserved if
<TT><STRONG>
preserve
</STRONG></TT>
is 1. If this is not required, set
<TT><STRONG>
preserve
</STRONG></TT>
to 0 and a more efficient
traversal algorithm will be used.
<P>
If the input
<TT><STRONG>
Object
</STRONG></TT>
is a Group and
<TT><STRONG>
copy
</STRONG></TT>
is 0, it
operates directly on the Groups of the input
<TT><STRONG>object</STRONG></TT>.
<P>
In either case, for every Field
<TT><STRONG>
f
</STRONG></TT>
that is a member of a Group,
it makes a call of the form
<TT><STRONG>process(f</STRONG></TT>, <TT><STRONG>args</STRONG></TT>,
<TT><STRONG>size)</STRONG></TT>
and places
the result of that call in the output in place of
<TT><STRONG>f</STRONG></TT>. The
<TT><STRONG>
process
</STRONG></TT>
function is intended to return a Field which is the processed
version of input Field
<TT><STRONG>f</STRONG></TT>.
<P>
Regardless of the value of the
<TT><STRONG>
copy
</STRONG></TT>
parameter, the Field passed to the
<TT><STRONG>
process
</STRONG></TT>
function is the Field from the original Object and not a copy.
<P>
The <TT><STRONG>size</STRONG></TT> parameter specifies the size of the block
pointed to by <TT><STRONG>args</STRONG></TT>.
If <TT><STRONG>size</STRONG></TT> is nonzero, it makes a copy of the
argument block and places it in global memory before
passing it to <TT><STRONG>process</STRONG></TT>.
The argument must be in global memory because
<TT><STRONG>DXProcessParts</STRONG></TT> may run
in parallel;
however, if the pointer passed is, for example, just a pointer to an
Object that is already in global memory, then
<TT><STRONG>size</STRONG></TT> can be given as 0.
<TT><STRONG>args</STRONG></TT> should not contain pointers to local memory.
<P>
If the <TT><STRONG>process</STRONG></TT> function returns
<TT><STRONG>NULL</STRONG></TT>, and <TT><STRONG>preserve</STRONG></TT>
is 1 or the Field was part of a Series Group or was the
entire input Object, the <TT><STRONG>NULL</STRONG></TT>
return value is replaced with an empty Field.
<P><STRONG>Return Value</STRONG>
<P>
Returns the Object, a copy of the Object, or a processed version of it,
depending on the parameters; otherwise, it returns
<TT><STRONG>NULL</STRONG></TT> and sets an error code.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu191.htm#HDRDXGP">DXGetPart</A>,
<A HREF="progu192.htm#HDRDXGPC">DXGetPartClass</A>,
<A HREF="progu320.htm#HDRDXSP">DXSetPart</A>
</STRONG></TT>
<P>
<A HREF="progu045.htm#HDRPRTS">"Parts"</A>.
<P><P>
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