DynaPDF Manual - Page 148

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Function Reference

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Result:

Example 3:

The following two versions are a bit confusing, I know...

root = pdfAddLayerToDisplTree(PDF, NULL, oc1, NULL);

grp

= pdfAddLayerToDisplTree(PDF, root, -1, NULL);

pdfAddLayerToDisplTree(PDF, grp, oc2, NULL);

pdfAddLayerToDisplTree(PDF, grp, oc3, NULL);

Result:

Example 4:

root = pdfAddLayerToDisplTree(PDF, NULL,oc1,"A layer group with a title");

grp

= pdfAddLayerToDisplTree(PDF, root, -1, NULL);

pdfAddLayerToDisplTree(PDF, grp, oc2, NULL);

pdfAddLayerToDisplTree(PDF, grp, oc3, NULL);

Result:

There is a special case that produces the same result in Acrobat but certain viewers have problems

to display the layer tree depending on the used syntax. Compare the following two versions:

root = pdfAddLayerToDisplTree(PDF, NULL, -1, "This is a group");

grp

= pdfAddLayerToDisplTree(PDF, root, -1, NULL);

pdfAddLayerToDisplTree(PDF, grp, oc1, NULL);

pdfAddLayerToDisplTree(PDF, grp, oc2, NULL);

pdfAddLayerToDisplTree(PDF, grp, oc3, NULL);

root = pdfAddLayerToDisplTree(PDF, NULL, -1, NULL);

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