imageData and depth from a Mat Object

edit

Hi All,

I have a code snippet which uses OpenCV's C interface.
The code uses IplImage* and obtains its imageData, widthStep and depth.
Now, We are modifying our code to use C++ based interface and Mat class.
Could you please tell me how to obtain imageData, widthStep and depth from a Mat object?

Thanks,
Soaptechie