Problems getting Vim's omnicppcomplete to work right

I'm trying to get OmniCppcomplete to work and I'm running into trouble. I've followed the steps on this page (including the things to add to the .vimrc file). I downloaded and extracted the zip file to ~/.vim, I ran the commands it says, I did everything there and it still doesn't work. I also tried downloading the modified stl for the __STD_NAMESPACE_BEGIN fix. I ran ctags on the dir开发者_JAVA百科ectory and placed the tags file in ~/.vim/tags/cpp.

Whenever I type a class name or namespace name followed by a . or :: or whatever, I only get an error saying Omni completion (^O^N^P) Pattern not found. I've run tselect TestClass to see that the tags were actually being generated and they are, so I'm at a loss as to what's happening.

I think I figured it out. I had been placing my tags in a directory called ~/.vim/tags/cpp/, rather than making a file called cpp and placing it in the tags directory. It seems to work now.