make an array of x-y picks as part of a data processing flow

Hi all:

I need to make an array of x,y pairs from picks on a spectrogram. I've been going over the docs, but I'm new to C++ and just got lost. I've gotten pretty far, so with a small example I'll manage.

The thing is that the application does more than that, so the user will do the picks just as part of a data processing flow. This means (I think) that the picking code has to be outside the specifications of the spectrogram, and I need to decide when the picking starts and when it stops...

Any kind of help will be greatly appreciated.

Best regards.