[Help] C++ GetPixel of DirectX window topic

Hi guys. I want to write a good program-helper, but I have a problem:
How to get RGB pixel of DirectX window?

Here is video about current version:
http://youtu.be/ThmhQmglclw

Need only check for the free slots.
I want to write a program without injecting in the game process.

Please, write an example of C++ code (or C#).

After writing the final version of the program, I'll post it on the forum :) Of course, if users need it.

I think u understand me, because my english is so bad D:

Thank you!

Best regards,
uhx