Command Line in driver

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WinXP

C++

Windows

driver

Hello!

I read a Rootkits: Subverting the Windows Kerneland and i have one question how can i create function in driver who be similar to the function in c++ system? I want have result this function in buffer. Sample:
char reslut[256];
command("dir c:\", result);
In reslut i want have directory and file list. How can i create this function in driver ?