Help me help him help me

February 12, 2007 8:58 AM

Help me help my friend help me. He's working on a database project using MusicBrainz (the one here) and has run into a programming issue--he's unable to retrieve tracks. He's using C++ and XML. Details are inside.

Here is his question:
=========
i guess the question would be partially concerning this block of code:

for (ReleaseList::iterator i = releases.begin(); i != releases.end(); i++) {
Release *release = *i;
ReleaseEventList relList = release->getReleaseEvents();
tList = release->getTracks();
cout < endl; cout id : release->getId() < endl; cout title : release->getTitle() < endl; cout year : release->getReleaseEvent(0)->getDate().substr(0,3) < endl; cout tracks : release->getTrack(0)->getTitle() < endl; cout tracks follow --- endl; for (j=0; j =release->getNumTracks() - 1; j++) {
cout < track j release->getTrack(j) < endl; } } which seems to segfault (crash) at the strong>release->getReleaseEvent(0)->getDate().substr(0,3) < endl;/strong> line.

The getReleaseEvent() seems to be causing the problem, more than anything.

Then when I try to get tracks...

cout < tracks : release->getTrack(0)->getTitle() < endl;/strong> also seems to crap out.

Finally,

for (j = 0; j < release->getNumTracks() - 1; j++) {
cout < track j release->getTrack(j) < endl; }/strong>

just doesn't work, because getNumTracks() ALWAYS returns 0.
=========
Thank you very much!

posted by schroedinger to computers & internet (3 comments total)

Ow. I'd like to help you, but the formatting there is hurting my brain. Is it possible that you could post the source somewhere with it's formatting intact, and the problem either as comments in the code, or a separate document?

In addition to the formatting, I can't really see enough of the implementation to get much of an idea of what's going on, so seeing some more source would help with that as well.
posted by benign at 9:35 AM on February 12, 2007

yeah, use something like dpaste to paste the code so we can see it a bit more legibly.

If the getReleaseEvent() call seems to be causing the problem, then it would be nice to know what that function does, it's requirements, etc. I'd guess that you're referring to this function but i'm not sure. I'd also want to see the code that created your ReleaseList in the first place.
posted by escher at 10:28 AM on February 12, 2007

Sweet Christmas, that came out a lot uglier on posting. And the strong tags are all messed up. Jesus. Sorry! Here is the dpaste link (thanks for the tip).
posted by schroedinger at 11:14 AM on February 12, 2007