How to get correct value from parallel port

Dear All,
i have one program which can get the input of parallel port and display the value on window.

Code:

---

void CProjDlg::OnCalculte()
{
       

        unsigned StatusAddress=0x378;
                int StatusPort;
              StatusPort=_inp(StatusAddress);
                m_value=StatusPort;
              UpdateData(0);

}

---

But StatusAddress (0x378) default value is 4 (100), so pin 3 always shows "1" even i connect it to ground, how can solve it?
Thank you.

Pin 3 is a writeonly datapin.
If you want to read use
pin 1 hw inverted, i/o
pin 10
pin 11 hw inverted
pin 12
pin 13
pin 14 hw inverted, i/o
pin 31 i/o
pin 32
pin 36 i/o