Re: [osg-users] [osgPlugins] Difficulties to load images from memory
Hello community, Apparently, the problem is related to the formation of the strings I'm trying to pass to the istringstream. Since they contain the \0 character, they finish earlier than expected. Has anybody found any workaround for this? Thank you! Cheers, Daniel -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40466#40466 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Difficulties to load images from memory
Daniel, Use the ios::binary open mode for istringstream. HTH Chuck On Jun 14, 2011, at 7:35 AM, Daniel Cámpora wrote: Hello community, Apparently, the problem is related to the formation of the strings I'm trying to pass to the istringstream. Since they contain the \0 character, they finish earlier than expected. Has anybody found any workaround for this? Thank you! Cheers, Daniel -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40466#40466 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Difficulties to load images from memory
Hi, std::string has a constructor that you can pass a char* and size to. string ( const char * s, size_t n ); This ignores \0's. You can then it into a stringstream or possibly even directly put it into stringstream.str() HTH jp On 14/06/11 16:35, Daniel Cámpora wrote: Hello community, Apparently, the problem is related to the formation of the strings I'm trying to pass to the istringstream. Since they contain the \0 character, they finish earlier than expected. Has anybody found any workaround for this? Thank you! Cheers, Daniel -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40466#40466 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html. This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Difficulties to load images from memory
Thanks J.P., that was the working solution :) I found a comprehensive explanation on SO, if anybody is interested. http://stackoverflow.com/questions/2786816/how-to-create-c-istringstream-from-a-char-array-with-null0-characters Thanks! :) Daniel -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40473#40473 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Difficulties to load images from memory
Hi Daniel,
On 10/06/11 15:56 , Daniel Cámpora wrote:
I'd like to use the image loaders OSG implements. I've succesfully fetched
images from
web links and my own HD. However, now I'm trying to do the same with an image
stored in
a string, in main memory.
My OSG version is 2.9.9. The extension for the file is png, and considering s
is the
string containing the image, I've tried the following portion of code:
Code: osg::ref_ptrosg::Image image;
osgDB::ReaderWriter* rw =
osgDB::Registry::instance()-getReaderWriterForExtension(png);
if (rw) {
osgDB::ReaderWriter::ReadResult rr = rw-readImage(s);
if ( rr.success() )
image = rr.takeImage();
}
None of the plugins support reading from a string (a string is always
interpreted as a
file name), but some support reading from a stream, which can be a stringstream.
Try (from memory):
std::stringstream ss(s);
rw-readImage(ss);
Cheers,
/ulrich
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Re: [osg-users] [osgPlugins] Difficulties to load images from memory
Hi Ulrich, Thanks for the answer. Shortly before your answer I found out I could try the istringstream, but I still can't get it to work. The direct conversion is not working out of the box for me, it might be related to the string not being correctly generated (png crashes, jpeg gives a Corrupt JPEG data pop up). I'll keep trying. Thank you! Cheers, Daniel -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40358#40358 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
