Felix, yes you should be able to use FileFromMemBuffer() to create a virtual file and open it with the PNG driver (since the PNG driver supports virtual IO --> as confirmed by gdalinfo --format PNG)
Here's the C API for it : http://gdal.org/cpl__vsi_8h.html#1ecb3a78729ecea4d2ce22065a605244 And here's an extract of a test in the Python autotest suite. content = open('data/byte.tif', mode='rb').read() # Create in-memory file and initialize it with the content gdal.FileFromMemBuffer('/vsimem/tiffinmem', content) # Open the in-memory file ds = gdal.Open('/vsimem/tiffinmem') # do something with the dataset # Close the dataset ds = None # Release memory associated to the in-memory file gdal.Unlink('/vsimem/tiffinmem') Disclaimer: You should be able to adapt the above for C#, but I haven't tested with the C# bindings, so there's a risk that they aren't ready if there's some missing required typemap. Best regards, Even Le Wednesday 26 May 2010 10:21:04 Felix Obermaier, vous avez écrit : > Tamas, > > I just went through the gdal 1.7 release notes, and read that a function > 'FileFromMemBuffer' was added to the csharp bindings. Since I'm getting > image blobs from an sqlite database (png), is it a suitable way to use that > function? > > Thanks > Felix Obermaier > > ------------------------------------------ > Ingenieurgruppe IVV GmbH & Co. KG > Dipl.-Ing. Felix Obermaier > Oppenhoffallee 171 > 52066 Aachen > > Telefon: +49 (241) 94691-39 > Telefax: +49 (241) 531622 > eMail: o...@ivv-aachen.de<mailto:o...@ivv-aachen.de> > Internet: http://www.ivv-aachen.de > > Sitz der Gesellschaft: Aachen > Amtsgericht Aachen HRA 6212 > GF: Bauassessor Dr.-Ing. Dieter Hölsken > IVV-Management GmbH > Amtsgericht Aachen HRB 12543 > > Von: Tamas Szekeres [mailto:szeker...@gmail.com] > Gesendet: Donnerstag, 20. Mai 2010 23:03 > An: Felix Obermaier > Cc: gdal-dev@lists.osgeo.org > Betreff: Re: [gdal-dev] Create gdaldataset from in-memory > Image/Bitmap/byte[]/MemoryStream > > Felix, > > You can find examples in the gdal source tree about creating a dataset and > write data by using the WriteRaster method: > > http://trac.osgeo.org/gdal/browser/trunk/gdal/swig/csharp/apps/GDALWrite.cs > http://trac.osgeo.org/gdal/browser/trunk/gdal/swig/csharp/apps/GDALDatasetW >rite.cs > > For more information about the raster IO operations in C# see: > http://trac.osgeo.org/gdal/wiki/GdalOgrCsharpRaster > > Best regards, > > Tamas > > > > 2010/5/20 Felix Obermaier <o...@ivv-aachen.de<mailto:o...@ivv-aachen.de>> > Hello list, > > I'm using GDAL via swig C# bindings. Is there a way to create a gdal > dataset object from an in-memory Image/Bitmap/byte[]/MemoryStream, and if > so, how can I achive this. > > Thanks in advance > > Felix Obermaier > > ------------------------------------------ > Ingenieurgruppe IVV GmbH & Co. KG > Dipl.-Ing. Felix Obermaier > Oppenhoffallee 171 > 52066 Aachen > > Telefon: +49 (241) 94691-39 > Telefax: +49 (241) 531622 > eMail: obe_at_ivv-aachen.de<http://obe_at_ivv-aachen.de> > Internet: http://www.ivv-aachen.de > > Sitz der Gesellschaft: Aachen > Amtsgericht Aachen HRA 6212 > GF: Bauassessor Dr.-Ing. Dieter Hölsken > IVV-Management GmbH > Amtsgericht Aachen HRB 12543 > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org<mailto:gdal-dev@lists.osgeo.org> > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev