How do I use the open type?

In short, if you work in automatic mode, you set the decoded and the pduNum fields of OpenType to your sub-PDU to be carried by the OpenType value to automatically encode. In the manual mode, you call ossEncode() any times to encode all the sub-PDUs meant for carrying by the OpenType values, then you call ossEncode() one more time setting the encoded and the length fields of OpenType.

In automatic mode, you skip the additional calls to ossEncode() and instead you must pass the AUTOMATIC_ENCDEC flag to the runtime:


For more information, see the Open Type Structures section.

The samples included with some of the Knowledge Center answers are meant for your general understanding of the OSS products. Different versions of the products might produce slightly different outputs. Consult the products documentation and samples for the most up-to-date products information and code examples.

Contact Support
contact Our office hours
24 hours/day, 7 days/week

  • Phone: 1-888-OSS-2761 (USA and Canada)
  • Phone: 1-732-302-9669 (International)
  • Fax: 1-732-302-0023
  • Email:
Free Trial

Test drive the OSS Nokalva ASN.1, LTE, and XML Tools now! Your trial includes complete software, documentation, sample programs, free 24x7 technical support and more.

Learn ASN.1
Learn ASN.1

Our expert personnel can help you learn ASN.1!

We offer 4-day ASN.1 courses at our headquarters or your premises.