Hi, I’ve already tried db_ls () but it doesn’t work i.e., when I run tops command on:
moss.g: I get all.g ktank.g: I get tank, etc. But when I execute your given example with moss.g it just outputs all objects. Maybe I’m doing something wrong, I’ve uploaded the example here (https://github.com/asadpiz/brlcad-viewer/blob/master/test.c) Compilation (make sure moss.g is in the same directory) gcc -o test test.c -L/usr/brlcad/rel-7.26.1/lib -lrt -lbu -I/usr/brlcad/rel-7.26.1/include -I/usr/brlcad/rel-7.26.1/include/brlcad # ./test found 14 top level objects top path is platform.s top path is platform.r top path is ellipse.s top path is ellipse.r top path is light.r top path is cone.s top path is cone.r top path is sph1.s top path is box.s top path is box.r top path is tor.r top path is all.g top path is LIGHT top path is tor From: Christopher Sean Morrison [mailto:brl...@mac.com] Sent: 03 August 2016 04:57 To: BRL-CAD Developer Mailing List <brlcad-devel@lists.sourceforge.net> Subject: Re: [brlcad-devel] Finding top level objects On Aug 2, 2016, at 4:04 PM, (Asad) Syed, Asadullah Hussain <asadullah.huss...@tum.de<mailto:asadullah.huss...@tum.de>> wrote: Hi, I want to programmatically extract top level objects for a g file (the ones you get when “tops” command is issued in mged). According to the definition top level objects are the ones which aren’t referenced by any other combination. Looking at the ged_tops function I deduced that the only check is to see if “dp->d_nref == 0”, where dp is a “struct directory” pointer. But the problem that I have is that all objects seem to have dp->d_nref==0 and even when I use db_ls using “DB_LS_TOPS” flag still I get ALL objects. Am I missing something? Yes, as that’s a potentially unnecessary and sometimes expensive calculation, so it doesn’t get computed automatically. You have to call db_update_nref(). See libged/tops.c:84. That said, probably a better way than calculating tops yourself is to call db_ls(). Here’s a functioning example*: int main(void) { struct db_i *dbip = db_open("test.g", DB_OPEN_READONLY); struct directory **tops; db_dirbuild(dbip); int count = db_ls(dbip, DB_LS_TOPS, NULL, &tops); bu_log("found %d top level objects\n", count); while (count > 0) { bu_log("top path is %s\n", tops[count-1]->d_namep); count--; } if (tops) bu_free(tops, "free tops"); return 0; } Cheers! Sean * note this is a quick example that assumes c99
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