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List: paraview
Subject: Re: [Paraview] SafeDownCast to vtkDoubleArray fails
From: Robert Maynard <robertjmaynard () gmail ! com>
Date: 2008-09-23 18:31:44
Message-ID: 48D93610.4070700 () gmail ! com
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If you launch the program for a terminal window on OSX or Linux you
should get all the print statements. On windows I know that pvservers
launched from the command line also properly print out couts,fprints
etc. I have never launced paraview.exe from a windows command line to
see if that works.<br>
Geoff Draper wrote:
<blockquote
cite="mid:alpine.DEB.0.82.0809231105140.31364@thebes.cs.utah.edu"
type="cite">I've never succeeded at getting ParaView to output to the
console. I usually just direct my debugging output to a log file. If
anyone has any tips for printing to stdout or stderr from within
ParaView, I'd be interested to learn them.
<br>
<br>
On Tue, 23 Sep 2008, Natalie Happenhofer wrote:
<br>
<br>
<blockquote type="cite"><br>
I tried that Print(cerr), but I didn´t see anything printed on my
console.. I hoped that would give me information to which class my
getArr belongs.
<br>
thats the line where I used it:
<br>
<br>
input -> GetPointData() -> GetArray(0) ->Print(cerr);
<br>
<br>
I do not know what I should try next..
<br>
NH
<br>
<br>
<blockquote type="cite">Date: Mon, 22 Sep 2008 09:18:00 -0400
<br>
From: <a class="moz-txt-link-abbreviated" \
href="mailto:burlen.loring@kitware.com">burlen.loring@kitware.com</a> <br>
To: <a class="moz-txt-link-abbreviated" \
href="mailto:nataliehapp@hotmail.com">nataliehapp@hotmail.com</a> <br>
CC: <a class="moz-txt-link-abbreviated" \
href="mailto:paraview@paraview.org">paraview@paraview.org</a> <br>
Subject: Re: [Paraview] SafeDownCast to vtkDoubleArray fails
<br>
<br>
Natalie Happenhofer wrote:
<br>
<blockquote type="cite">Hi!
<br>
Thx a lot, I get now a DataArray using
<br>
getArr = scaldat ->GetArray(0); //I just have one array in my point
data
<br>
<br>
But still the downcast to vtkDoubleArray fails, here is the code I
used:
<br>
<br>
scaldat = input -> GetPointData();
<br>
vtkDataArray *getArr = vtkDataArray::CreateDataArray(VTK_DOUBLE);
<br>
getArr = scaldat -> GetArray(0);
<br>
</blockquote>
This is going to create a leak, because you ask for a New() an array
<br>
then reassign your pointer to it before you call Delete().
<br>
<br>
<blockquote type="cite"><br>
vtkDoubleArray *scalars = vtkDoubleArray::New();
<br>
scalars = vtkDoubleArray::SafeDownCast(getArr); //this downcast fails,
<br>
i.e at runtime I get that warning below
<br>
</blockquote>
Again this results in a leak for same reason.
<br>
<blockquote type="cite"> if(!scalars) vtkErrorMacro("SafeDownCast
to vtkDoubleArray failed");
<br>
<br>
<br>
With the member function "IsTypeOf(char *classname)" I tried to find
<br>
out if getArr is an array of a subclass of vtkDataArray, but this does
<br>
not seem to be the case. getArr is just a vtkDataArray. But I need to
<br>
access the values in it!!!
<br>
</blockquote>
There are a few reasons why the cast could fail. Do you know for sure
<br>
that getArr is not null? Could you check to be sure the array in
<br>
question is actually a double array? Try getArr->Print(cerr); That
<br>
should give more info. If this happened to me I would open the code in
a
<br>
debugger and single step through this portion of the code examining
<br>
variables to see they have the expected values.
<br>
<br>
<br>
<blockquote type="cite"><br>
thx,
<br>
NH
<br>
<br>
<br>
<br>
<blockquote type="cite">Date: Sun, 21 Sep 2008 11:49:00 -0400
<br>
From: <a class="moz-txt-link-abbreviated" \
href="mailto:burlen.loring@kitware.com">burlen.loring@kitware.com</a> <br>
To: <a class="moz-txt-link-abbreviated" \
href="mailto:nataliehapp@hotmail.com">nataliehapp@hotmail.com</a> <br>
CC: <a class="moz-txt-link-abbreviated" \
href="mailto:paraview@paraview.org">paraview@paraview.org</a> <br>
Subject: Re: [Paraview] SafeDownCast to vtkDoubleArray fails
<br>
<blockquote type="cite">
<blockquote type="cite">
<blockquote type="cite">Natalie Happenhofer wrote:
<br>
</blockquote>
</blockquote>
Hi!
<br>
I need to cast my Point Data to a vtkDoubleArray, but it fails:
<br>
<br>
vtkPointData *scaldat = input -> GetPointData();
<br>
vtkDoubleArray *scalars = vtkDoubleArray::New();
<br>
scalars = vtkDoubleArray::SafeDownCast(scaldat);
<br>
if(!scalars) vtkErrorMacro("SafeDownCast to vtkDoubleArray failed");
<br>
</blockquote>
PointData is not an array, it's a container of arrays. To get one of
<br>
</blockquote>
its
<br>
<blockquote type="cite">arrays see the GetArray methods.
<br>
<br>
</blockquote>
<a class="moz-txt-link-freetext" \
href="http://www.vtk.org/doc/nightly/html/classvtkFieldData.html#888a6492210426d4ba4d3 \
58b87ab198f">http://www.vtk.org/doc/nightly/html/classvtkFieldData.html#888a6492210426d4ba4d358b87ab198f</a>
<br>
<blockquote type="cite"><br>
To find this in the documentation you would have to use the inheritance
<br>
diagrams. PointData "is a" DataSetAttibutes "is a" FieldData and so on.
<br>
<br>
<blockquote type="cite"><br>
and everytime I run the program I get that vtkErrorMacro.
<br>
as far as I know from the input files, the PointData should be float,
<br>
but casting to vtkFloatArray fails as well. Why? and what can I do
<br>
about it?
<br>
<br>
thx a lot,
<br>
NH
<br>
<br>
<br>
</blockquote>
</blockquote>
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<blockquote type="cite">
<blockquote type="cite"><br>
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<br>
<br>
--
<br>
Burlen Loring
<br>
Kitware, Inc.
<br>
R&D Engineer
<br>
28 Corporate Drive
<br>
Clifton Park, NY 12065-8662
<br>
Phone: 518-371-3971 x137
<br>
<br>
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<br>
</blockquote>
<br>
<br>
--
<br>
Burlen Loring
<br>
Kitware, Inc.
<br>
R&D Engineer
<br>
28 Corporate Drive
<br>
Clifton Park, NY 12065-8662
<br>
Phone: 518-371-3971 x137
<br>
<br>
</blockquote>
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<pre wrap="">
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