public IntPtr GetExtendedDataPtr(
Presentation Context ID of the Presentation Context from which to retrieve the extended data. The ID provides information about both the class type of the data and the Transfer Syntax to use when transferring the data. It also identifies a specific Presentation Context within an Associate.
Pointer to a buffer that contains the extended data for the specified Presentation Context of the DICOM Associate.
For an example, refer to IsRoleSelect.