Supported Form Fields
ComPDFKit PDF SDK supports all form types specified by the PDF specification (such as text boxes, checkboxes, radio buttons, drop-down lists, pushbuttons, and signatures).
is the base class for all form fields, and is subclass for A object by itself is not useful, only subclasses , , , ) are interesting. In parsing a PDF, however, any unknown or unsupported form fields will be represented as this base class.
We have to differentiate between field types and annotation objects: