Handle to a PDF dictionary object, which represents an optional-content membership dictionary object.
| IG_PDF_dictionary_create | Creates a new optional-content membership dictionary object in the given document for the given layers and visibility policy. |
| IG_PDF_dictionary_get_layer | Gets the layer with the specified index in a membership dictionary. |
| IG_PDF_dictionary_get_layer_count | Gets the number of layers listed in a membership dictionary. |
| IG_PDF_dictionary_get_unique_id | Returns some 32-bit integer that is unique for all Dictionary objects. |
| IG_PDF_dictionary_get_vis_policy | Gets the optional-content membership dictionary's visibility policy. |
| IG_PDF_dictionary_release | Releases the native object and frees memory. |