<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Thanks Giovani for the response. I am developing a network modeling tool that analyzes a roadway bicycle transportation based on a classification scheme that we came up with. I have done routing for walk access to transit in the past and I am looking forward to porting that also to QGIS. But right now the modeling tool uses three sets of data (edge/vertex relationship) and using a network Voronoi algorithm (it is a sort of modified Tarjan/Dijkstra) to produce a demographic based trip matrix. <br><br>I would be delighted to contribute it, as long as the sponsoring agency, Mineta Transportation Institute (at San Jose State University) does not have problems with it. I am assuming they would be very happy to have a wider circulation for the work. I am grateful for this project, and I have come to enjoy using QGis and programming with it very much.<br><br>I have
done the routing using pure C++ before, and I find that to be extremely productive and meets the challenges of processing large amounts of data. I have written a couple of network processing plugins using Python and they took a lot of time to run. But now that I am a bit proficient with C++ plugins in QGIS it is very fast sometimes it is too fast to compare with Python. This goes even for ArcGIS and VB (I have done some programming inside Esri Software also). <br><br>My suggestion for any data intensive work and one that would stay long, one should use C++.<br> <br>What should I do with the error? Why is it happening, I am using QGis version 1.6. I am compiling from the 1.7 trunk.<br><br>Thank you for your help,<br><br>Maaza <br><br>--- On <b>Tue, 5/24/11, Giovanni Manghi <i><giovanni.manghi@gmail.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From:
Giovanni Manghi <giovanni.manghi@gmail.com><br>Subject: Re: [Qgis-developer] Exception "Access Violation No RTTI- Data!" on windows XP (32 bit)<br>To: "maaza mekuria" <sailmcm@yahoo.com><br>Cc: "qgis-dev" <qgis-developer@lists.osgeo.org><br>Date: Tuesday, May 24, 2011, 3:22 PM<br><br><div class="plainMail">Hi,<br><br>I recall that the error had something related with the TOC. Since the<br>TOC has been upgraded to included nested groups and multiple layer<br>selection the error seems to have gone.<br><br><br>On another note: what does your plugin? do you plan to contribute it?<br><br><br>Cheers<br><br>-- Giovanni --<br><br><br>On Mon, 2011-05-23 at 12:45 -0700, maaza mekuria wrote:<br>> I am getting the error "Access Violation No RTTI- Data!" while I am<br>> running my C++ plugin. I checked out on the web to see what if it was<br>> reported by anyone, and I found some references about a year ago. I am<br>>
not sure if any of you have come across of the same and know why it is<br>> due to. The plugin does not crash but I am not able to find out what<br>> is causing it. I am opening multiple layer data using the layer data<br>> providers (shape file layers on the canvas.) and nothing more<br>> unusual.<br>> <br>> The web problems were reported about a year ago and I can not see what<br>> was the resolution except the new version seemed to take of it. <br>> Thank you,<br>> <br>> Maaza<br>> <br>> <br>> <br>> _______________________________________________<br>> Qgis-developer mailing list<br>> <a ymailto="mailto:Qgis-developer@lists.osgeo.org" href="/mc/compose?to=Qgis-developer@lists.osgeo.org">Qgis-developer@lists.osgeo.org</a><br>> <a href="http://lists.osgeo.org/mailman/listinfo/qgis-developer"
target="_blank">http://lists.osgeo.org/mailman/listinfo/qgis-developer</a><br><br><br></div></blockquote></td></tr></table>