How to check if the caps lock in on/off using C++?

I need to check if the the Caps-Lock in on or off.

I have tried this function

bool CheckKeyState()
{
   if ((GetKeyState(VK_CAPITAL) & 0x0001)!=0)
      return true;

    return false;

}

I had to include the windows library

#include <Windows.h>

But it is returning true weather the caps is on or off.

what am I doing wrong? how can I check if the Caps-Lock in on or not?