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Howdy HDF5 Folk! As suggested in the ref manual I am using H5Gget_objinfo to test for the existence of an object in a HDF5 file. When I pass NULL as the last argument, I get a segmentation fault. When I pass in a valid hunk of memory, it works. I believe the docs say that I can pass a NULL here to test for object existence without caring about the contents of the H5G_stat_t struct... Here's the code that works: H5G_stat_t info; if (H5Gget_objinfo(grp->hdf_grpid, var->name, 1, &info) >= 0) replace_existing_var++; Sorry, I'm blazing through something here and don't have time to isolate this one in it's own program yet... Thanks! Ed -- Ed Hartnett -- ed@xxxxxxxxxxxxxxxx