Get that is writed on screen functions

Hello, my idea is a function that return the character is writed on the screen with it color and it background color.
Example:

char, color, bgcolor = term.getWritedChar(1,1) -- parameters is the cursor position

Can you do this, please ?
Thanks, and sorry for my english (I am french :P/>/>)

I'll add this in my New Version of my Screencapture Program ^^