Is there any way to call the Windows Native API functions from the user mode?

I want to call some Native API function from the user mode with C++. I was wond开发者_如何学运维ering if it is possible to circumvent the Windows API interface completely and call directly the Native API functions from the user mode.

If possible then any code examples will be really helpful.

Yes it is possible, as all functions are exposed ntdll.dll. However you would need to write your own header file for those API functions you want to use. There is no official documentation on the NT API and it is not really meant to be used directly. But it is possible.

Here is a starting point.