Thanks Frank. That seems to be the issue. Whats the rule about this how long you should keep a reference. For example this causes the same issue. <div><br><div>ds.GetLayer().GetFeature(0).GetGeometryRef().GetEnvelope()</div>
<div><br></div><div>Which I am going to guess is because I should keep a reference to the geometry. Correct? </div><div><br clear="all"><div>Ivan Willig</div><br><br>
<br><br><div class="gmail_quote">On Tue, Oct 26, 2010 at 10:44 AM, Frank Warmerdam <span dir="ltr"><<a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div></div><div class="h5">Ivan Willig wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi list,<br>
I am having an issues with using the python swig based bindings. I am on Fedora 13 using the default gdal rpm, which is at version 1.6.2. My issue is when i stack method calls. For example when I do the following: <br>
ogr.Open("/home/ivan/dev/bigapps/data/nyco.shp").GetLayer().GetFeature(0)<br>
<br>
<br>
I get a Segmentation fault. Here are the results of strace <a href="http://paste.pocoo.org/show/281682/" target="_blank">http://paste.pocoo.org/show/281682/</a>. What am I doing wrong? Should I just hand compile a new version of gdal? Or is this not an advised usage of the python bindings? A limitation in swig? Thanks for your help.<br>
</blockquote>
<br></div></div>
Ivan,<br>
<br>
I believe the problem is object lifetimes. Keep a reference to the<br>
datasource around until you are done with the feature(s).<br>
<br>
ds = ogr.Open("/home/ivan/dev/bigapps/data/nyco.shp")<br>
feat = ds.GetLayer().GetFeature(0)<br>
...<br>
feat = None<br>
ds = None<br>
<br>
Best regards,<br><font color="#888888">
-- <br>
---------------------------------------+--------------------------------------<br>
I set the clouds in motion - turn up | Frank Warmerdam, <a href="mailto:warmerdam@pobox.com" target="_blank">warmerdam@pobox.com</a><br>
light and sound - activate the windows | <a href="http://pobox.com/~warmerdam" target="_blank">http://pobox.com/~warmerdam</a><br>
and watch the world go round - Rush | Geospatial Programmer for Rent<br>
<br>
</font></blockquote></div><br></div></div>