bool OEChemIsLicensed(const char *feature=0, unsigned int *expdate=0)

Determines whether a valid license file is present. This function may be called without a legitimate run-time license to determine whether it is safe to call any OEChem TK, OESystem TK or OEPlatform TK functionality.

For example, to verify that OEChem TK can be used:

  if (!OEChemIsLicensed())
    OEThrow.Warning("OEChem is not licensed.");

The second argument can be used to get the expiration date of the license. This is an array of size three with the date returned as {day, month, year}. Even if the function returns false due to an expired license, the ‘expdate’ will show that expiration date. A value of a zeroes implies that no license or date was found.

  const char *feature = nullptr;
  unsigned int expdate[3];
  if (OEChemIsLicensed(feature, expdate))
    OEThrow.Info("License expires: day: %d  month: %d year: %d",
      expdate[0], expdate[1], expdate[2]);