VC: Registry and Software Protection (CRegKey)

1. initializing the function:

 

CRegKey reg, reg2;

DWORD dValue;

CString str;

 

Extern BOOL flag;

 

LPCTSTR lp = "Software \ num \\";

If (reg. Open (HKEY_CURRENT_USER, lp) = ERROR_SUCCESS & reg. QueryValue (dValue, "sum") = ERROR_SUCCESS) // Open the Registry

{

;

}

Else

{

Reg. Create (HKEY_CURRENT_USER, "Software ");

Reg. Create (reg. m_hKey, "num ");

Reg. SetValue (10, "sum ");

}

 

 

If (reg2.Open (HKEY_CURRENT_USER, lp) = ERROR_SUCCESS)

{

If (reg2.QueryValue (dValue, "sum") = ERROR_SUCCESS)

{

Str. Format ("the maximum number of times this software is used is 10, and the remaining number is % d", dValue );

SetDlgItemText (IDC_STATIC, str );

Reg. SetValue (dValue-1, "sum ");

If (dValue> 10)

{

Flag = false;

}

Else

{

Flag = true;

}

}

Else

{

SetDlgItemText (IDC_STATIC, "Registry query error! ");

}

}

Else

{

SetDlgItemText (IDC_STATIC, "Registry open error! ");

}

Reg. Close ();

Reg2.Close ();

 

// Can this program be used?

If (! Flag)

{

AfxMessageBox ("times to limit ");

CDialog: OnOK ();

}