how can I verify that the archive has a password?

[kanejons]

While studying CLient7z, I saw this line of code in Extract:

Z7_COM7F_IMF(CArchiveExtractCallback::CryptoGetTextPassword(BSTR *password))
{
  if (!PasswordIsDefined)
  {
    // You can ask real password here from user
    // Password = GetPassword(OutStream);
    // PasswordIsDefined = true;
    PrintError("Password is not defined");
    return E_ABORT;
  }
  return StringToBstr(Password, password);
}

Trying to use it separately, I didn't succeed. I wanted to write a function before unpacking that would check the passwords of the archive, and then only unpack it.Can you tell me how to do this?

[Igor Pavlov]

No way to check password without unpacking for 7z archive.