Frank,
I've noticed some issues when using /vsimem/ to open a VRT dataset (among other
formats). The code usually fails @ GDALClose or FlushCache, when the dataset
tries to perform a VSIMemFile::SetLength, and ultimately a realloc. Many
formats I can only VSIUnlink, and don't try to close the dataset. I was going
to submit a bug report.
I'm trying to SetGeotransform like the tfw to 0,1,0,0,0,-1 in order to perform
a pixel space gdalwarp interopolation (i've actually wrapped the gdal utilities
into a single DLL to perform more integrated exception handling). So it tries
to open the same /vsimem/ VRT that was modified, but it still has the old
geotransform. Short term i'll probably add a parameter to the utilities to
pass the GDALDataset (source and destination) back and from from GDALWarp, but
it's a little more code i have to merge with each GDAL version upgrade.
-- Dan Greve
-- Palm Bay, FL
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