Remove or hide PDF layer using ABCPdf?
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19-09-2019 - |
Question
Is is possible to remove or hide a layer from a PDF using ABCPdf or another framework?
No correct solution
OTHER TIPS
The following C# example shows how layer 2 of page 1 can be deleted:
Doc theDoc = new Doc();
theDoc.Read("source.pdf");
int thePages = theDoc.GetInfoInt(theDoc.Root, "Pages");
int thePage = theDoc.GetInfoInt(thePages, "Page 1");
int theLayer = theDoc.GetInfoInt(thePage, "Content 2");
theDoc.Delete(theLayer);
Or perhaps you were looking for the Flatten() function?
ABCpdf contains an Example project called OCGLayers. This project shows you how to identify and redact all the items in a layer.
For example:
Properties props = Properties.FromDoc(_doc, false);
Page page = (Page)_doc.ObjectSoup[_doc.Page];
Reader reader = Reader.FromPage(props, page);
List<OptionalContent.Layer> layers = reader.GetLayers();
foreach (OptionalContent.Layer layer in layers) {
if (layer.Visible == false) {
if (reader == null)
reader = Reader.FromPage(props, page);
Reader.Redact(ref reader, layer);
}
}
UpdateLayers();
UpdatePreview();
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