bioChec™ : Sample Code

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bioChec™ :: Sample Code

Check out how simple adding secondary authentication can be:

Sample Windows® Handler for Verification
This example shows how to use the bioChec™ Keystroke Biometrics SDK in a normal windows environment to capture a single field for verification. This code snippet assumes a bioChecKey engine has already been instantiated as "bioChecKey myBCK", the window has a message field of IDC_MSG, an entry field of IDC_PASSPHRASE, and a template already loaded into the variable "bpTemplate".


LPCTSTR licenseInfo=_T("Populate with a license code ... or NULL for testing");
LPCTSTR debugInfo=_T("Sample Application");
bioChecKey_win32 myBCK(licenseInfo,debugInfo);

/* sample to read template from registry */
LPBYTE memoryBuffer = byte stream read from external source;
DWORD nBytes = size of template from external source read;
LPBYTE bpTemplate = myBCK.AllocEmptyTemplate(nBytes);
memcpy(bpTemplate,memoryBuffer,nBytes);

BOOL CALLBACK bckVerifyDlgProc
	( HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
  bCkRESULT bpRC = BIOCHEC_OK;
  switch (uMsg)
  {

  case WM_CLOSE:
    myBCK.HookStatusMsg(NULL);
    myBCK.UnhookAll();
    break;

  case WM_INITDIALOG:
    myBCK.HookField(GetDlgItem(hwndDlg,IDC_PASSPHRASE),_T("Passphrase"));
    myBCK.setFieldLen(_T("Passphrase"),8,32);
    SetDlgItemText(hwndDlg,IDC_PASSPHRASE,_T(""));
    myBCK.HookStatusMsg(GetDlgItem(hwndDlg,IDC_MSG));
    SetFocus(GetDlgItem(hwndDlg, IDC_PASSPHRASE));
    return FALSE;

  case WM_COMMAND:
    if (wParam==IDOK)
    {
      myBCK.HookStatusMsg(NULL);
      SetFocus(GetDlgItem(hwndDlg,IDOK)); // necessary for bioChecKey
      bpRC = myBCK.StoreSample();
      if ( bpRC == BIOCHEC_OK )
      {
        LPBYTE bpSignature = myBCK.CreateSignature();
        if ( bpSignature )
        {
            double dScore = myBCK.VerifySignature(bpSignature,bpTemplate);
            myBCK.FreeSignature(bpSignature);
            int iMin = 0;
            bpRC = myBCK.getLastError();
            if ( bpRC == BIOCHEC_OK )
            {
              iMin = myBCK.iConvertToScale(10,dScore,BCK_DEFAULT_THRESHOLD);
              if ( iMin >= 3 /*bioMinStrength*/ )
              {
		  /* ... do something nice here ... */
                EndDialog(hwndDlg,IDOK);
                return(TRUE);
              }
            }
        }
      }
      myBCK.resetFields();
      SetDlgItemText(hwndDlg,IDC_PASSPHRASE,_T(""));
      SetFocus(GetDlgItem(hwndDlg,IDC_PASSPHRASE));
      myBCK.HookStatusMsg(GetDlgItem(hwndDlg,IDC_MSG));
      return(TRUE);
    } // if (wParam==IDOK)
    return TRUE;
  } // switch (uMsg)
  return FALSE;
}

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