function Loaded: Boolean;
Returns True after the PDF library DLL has been loaded into the process.
The PDFium runtime must be loaded once per process; TPdf.LoadLibrary is called automatically on first Active := True.
Read at any time, including before any TPdf instance exists (it is a class function).
IsTagged is False).
if Pdf1.Active and Pdf1.Loaded then
Memo1.Lines.Add('Loaded = True')
else
Memo1.Lines.Add('Loaded = False');