How to set the OCG state of an existing PDF?

Tags: OCGoptional contentiText 7

I need to turn off a specific layer (OCG object) in an exisiting PDF that was created in Autocad and that sets the default value to "on". How can I change this to "off"?

Posted on StackOverflow on May 1, 2014 by HoustonVBnovice

I've created an example that turns off the visibility of a specific layer. See ChangeOCG.

The concept is really simple. If you want to apply a change to a file you create a PdfDocument object in iText 7. As you want to change an OCG layer, you use the getLayers() method and you select the layer you want to change by name. (In my example, the layer I want to turn off is named "Nested layer 1"). You use the setOn() method to change its status, and you're done:

public void manipulatePdf(String src, String dest) throws IOException {
    PdfDocument pdfDoc = new PdfDocument(new PdfReader(src), new PdfWriter(dest));
    List<PdfLayer> layers = pdfDoc.getCatalog().getOCProperties(true).getLayers();
    for (PdfLayer layer : layers) {
        if ("Nested layer 1".equals(layer.getPdfObject().get(PdfName.Name).toString())) {
            layer.setOn(false);
            break;
        }
    }
    pdfDoc.close();
}

This is Java code. Please read it as if it were pseudo-code and adapt it to your language of choice.

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