I know my self how to hook functions either the D3DX functions or through device->functions, is there anway to protect you're game - app from this?, how do the professional developers do it?

how do the professional developers do it?

They normally don't waste their time with such things.

If a determined and skilled programmer wants to interfere with software that is running on their computer they will find a way to do so no matter what preventions you attempt. Hooking is a more advanced topic beyond the abilities of the general public -- just be happy with that and move on.


More importantly, why do you think you want to do this? There may be a better solution for the problem you're trying to solve.

[size="1"]If you really want to do this you it should be possible, but it will be circumvented and probably isn't worth spending lots of time and effort on.