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I have been working on moving some code from osg 1.2 to 2.0. It has
largely gone smoothly but there is an issue with a call to readNodeFile.
In this particular case, the filename being passed to readNodeFile is the
name of an image file, and so I expect the read to fail and return a null
pointer. (I then test for this and conditionally try to read the same file
as an image file. It's a hack but it lets me handle map images and
topographic data with the same function.) However, when I compile this
code against the osg 2.0 libraries, the result is a segmentation fault. I
ran the program in gdb and was able to examine the stack, the relevant
portion of which I have reproduced below.
#0 in __dynamic_cast () from /usr/lib/libstdc++.so.6
#1 in osgDB::ReaderWriter::ReadResult::getNode (this)
at OpenSceneGraph/src/osgDB/ReaderWriter.cpp:22
#2 in osgDB::ReaderWriter::ReadResult::validNode (this)
at OpenSceneGraph/include/osgDB/ReaderWriter:158
#3 in osgDB::Registry::ReadNodeFunctor::isValid (this,
readResult)
at OpenSceneGraph/src/osgDB/Registry.cpp:1280
#4 in osgDB::Registry::read (this,
readFunctor)
at OpenSceneGraph/src/osgDB/Registry.cpp:1440
#5 in osgDB::Registry::readImplementation (this,
readFunctor, useObjectCache)
at OpenSceneGraph/src/osgDB/Registry.cpp:1508
#6 in osgDB::Registry::readNodeImplementation (this,
fileName, options)
at OpenSceneGraph/src/osgDB/Registry.cpp:1725
#7 in osgDB::Registry::readNode (this,
fileName, options)
at OpenSceneGraph/include/osgDB/Registry:207
#8 in osgDB::readNodeFile (filename, options)
at OpenSceneGraph/src/osgDB/ReadFile.cpp:60
#9 in osgDB::readNodeFile (filename)
at OpenSceneGraph/include/osgDB/ReadFile:107
In frame 1, I checked the fields of the ReadResult object, and noted that
they were mostly uninitialized, except for _status:
_status = osgDB::ReaderWriter::ReadResult::FILE_NOT_HANDLED
I guess that the segfault comes from trying to dynamic_cast an invalid
address. Is this an error in the osg code, or should I not be invoking
readNodeFile on a non-model file?
- Ian Zeilstra
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