Determining size of text rendered by IM

[Storm.50]

Hello!
I've question about determining size of text rendered by IM.
There are two methods described at this page.
How in Magick++ I can use the first one which uses -debug key? In example output info getting from console. How can I read this info in my program with Magick++?
Thanks for your answers!

[magick]

Use the fontTypeMetrics() to return the font metrics in the TypeMetric structure.

[Storm.50]

Thank you, magick!
This is what I wanted to know.