ant = page:CreateURILinkAnnot(rect, uri)
page:CreateURILinkAnnot() creates a new web link annotation object for the page.
The rect parameter must be a table which contains left, top, right, and bottom fields that describe
a rectangle.
#HPDF_INVALID_PAGE - An invalid page handle was set.
#HPDF_FAILED_TO_ALLOC_MEM - Memory allocation failed.