Skip to contents

Read and clear the PDFium unsupported-feature event buffer

Source: R/doc_extra.R
pdf_drain_unsupported_features.Rd

Returns the human-readable feature names PDFium has flagged as unsupported since the previous call (or since the handler was installed via pdf_install_unsupported_handler()). The buffer is cleared on read.

Usage

pdf_drain_unsupported_features()

Value

Character vector of feature names. Each entry is a human- readable string drawn from the FPDF_UNSP_* enum, e.g. "XFA form", "3D annotation", "document security", "signature annotation". Possibly contains duplicates if a feature was flagged multiple times.

Details

Returns character(0) when nothing has been flagged or when the handler is not installed (no events are buffered until installation).

See also

pdf_install_unsupported_handler() to enable the handler.

Examples

pdf_install_unsupported_handler()
doc <- pdf_doc_open(system.file("extdata", "fixtures", "shapes.pdf",
                                 package = "pdfium"))
pdf_drain_unsupported_features()  # character(0) -- nothing flagged
#> character(0)
pdf_doc_close(doc)